Last update 5 May 2015 ACCLAIM COASTAL TIDE GAUGE SITES - PHASE 2 ========================================== SUMMARY ======= Site Name Start/End Date Raw Data File Name/ Daily Means File Name Ascension (07 54 S 14 23 W) May 1993 - Nov 1993 ascn1.sl.Z / ascn.daily.sea.levels Nov 1993 - Jan 1995 ascn2.sl.Z .. Feb 1995 - Oct 1995 ascn3.sl.Z .. Oct 1995 - May 1996 ascn4.sl.Z .. May 1996 - Mar 1997 ascn5.sl.Z .. Mar 1997 - Jun 1998 asc6r.sl.Z .. Apr 1999 - Jun 2000 ascn8.sl.Z .. Jun 2000 - Apr 2001 ascna.sl.Z .. [data in between - see 'ascnb' note below] Sep 2005 - May 2006 ascng.sl.Z .. Apr 2006 - Jun 2008 ascnh.sl.Z Jun 2008 - Apr 2009 ascnj.sl.Z Jul 2009 - Dec 2009 ascnk.sl.Z Jan 2010 - Jan 2011 ascnl.sl Sep 2010 - Mar 2012 ascnm.sl Jan 2011 - Jun 2013 ascnn.sl Port Stanley (51 41 S 57 49 W) Oct 1992 - Nov 1993 stan2.sl.Z / stan.daily.sea.levels (Nov 1992 - May 1993 stan1.sl.Z) Nov 1993 - Mar 1994 sta3a.sl.Z .. Mar 1994 - Nov 1994 sta3b.sl.Z .. Nov 1994 - Nov 1995 sta3c.sl.Z .. Nov 1995 - Nov 1996 sta3d.sl.Z .. Dec 1996 - Jan 1998 sta3e.sl.Z .. Jan 1998 - Nov 1998 sta3f.sl.Z .. Nov 1998 - Oct 1999 sta4.sl.Z .. Mar 2000 - Jun 2000 sta5.sl.Z .. Nov 2000 - Oct 2003 sta8.sl.Z .. Oct 2003 - Nov 2004 sta9.sl .. Nov 2004 - Nov 2005 staa.sl .. Nov 2005 - Jan 2008 stab.sl .. Jan 2008 - Apr 2009 stac.sl .. Jan 2009 - May 2010 stad.sl .. May 2010 - Mar 2012 stae.sl .. Jan 2012 - Dec 2012 staf.2012.sl .. Jan 2013 - Dec 2013 staf.2013.sl .. Jan 2014 - Jan 2014 staf.jan2014.sl .. See notes below regarding Port Stanley data with regard to: - datums of the sea levels in each file, and - historical Port Stanley data from Government Jetty for 1964-69 and 1974 (52 42 S 57 52 W) St. Helena (15 55 S 05 43 W) Jun 1993 - Sep 1993 sthl1.sl.Z / sthl.daily.sea.levels Nov 1993 - Feb 1995 sthl2.sl.Z .. Feb 1995 - Oct 1995 sthl3.sl.Z .. Oct 1995 - Oct 1996 sth4u.sl.Z .. Apr 1997 - Dec 1997 sthl5.sl.Z .. Jan 1998 - Jul 1998 sthl6.sl.Z .. Jul 1998 - Jun 2000 sthl7.sl.Z .. Jun 2000 - Oct 2001 sthl8.sl.Z .. Oct 2002 - Oct 2004 sthl9.sl.Z .. Sep 2004 - Dec 2006 sthla.sl.Z .. Faraday/Vernadsky (65 15 S 64 16 W) Mar 1984 - Dec 1995 faraday.hourlies.pmc.adjusted / faraday.dailies.pmc.adjusted Jan 1996 - Dec 1997 faraday9697.hourlies.pmc.adjusted / faraday9697.dailies.pmc.adjusted Jan 1998 - Dec 1998 faraday98.hourlies.pmc.adjusted / faraday98.dailies.pmc.adjusted Jan 1999 - Dec 1999 faraday99.hourlies.pmc.adjusted / faraday99.dailies.pmc.adjusted Jan 2000 - Dec 2000 faraday00.hourlies.pmc.adjusted / faraday00.dailies.pmc.adjusted Jan 2001 - Dec 2001 faraday01.hourlies.pmc.adjusted / faraday01.dailies.pmc.adjusted Jan 2002 - Dec 2002 faraday02.hourlies.pmc.adjusted / faraday02.dailies.pmc.adjusted Jan 2003 - Dec 2003 faraday03.hourlies.pmc.adjusted / faraday03.dailies.pmc.adjusted Jan 2004 - Dec 2004 faraday04.hourlies.pmc.adjusted / faraday04.dailies.pmc.adjusted Jan 2005 - Dec 2005 faraday05.hourlies.pmc.adjusted / faraday05.dailies.pmc.adjusted Jan 2006 - Dec 2006 faraday06.hourlies.pmc.adjusted / faraday06.dailies.pmc.adjusted Jan 2007 - Dec 2007 faraday07.hourlies.pmc.adjusted / faraday07.dailies.pmc.adjusted Jan 2008 - Dec 2008 faraday08.hourlies.pmc.adjusted / faraday08.dailies.pmc.adjusted Jan 2009 - Dec 2009 faraday09.hourlies.pmc.adjusted / faraday09.dailies.pmc.adjusted Jan 2010 - Dec 2010 faraday10.hourlies.pmc.adjusted / faraday10.dailies.pmc.adjusted Jan 2011 - Dec 2011 faraday11.hourlies.pmc.adjusted / faraday11.dailies.pmc.adjusted Jan 2012 - Dec 2012 faraday12.hourlies.pmc.adjusted / faraday12.dailies.pmc.adjusted Jan 2013 - Dec 2013 faraday13.hourlies.pmc.adjusted / faraday13.dailies.pmc.adjusted Jan 2014 - Dec 2014 faraday14.hourlies.pmc.adjusted / faraday14.dailies.pmc.adjusted Jan 2015 - Dec 2015 faraday15.hourlies.pmc.adjusted / faraday15.dailies.pmc.adjusted Jan 2016 - Dec 2016 faraday16.hourlies.pmc.adjusted / faraday16.dailies.pmc.adjusted Jan 2017 - Dec 2017 faraday17.hourlies.pmc.adjusted / faraday17.dailies.pmc.adjusted Jan 2018 - Dec 2018 faraday18.hourlies.pmc.adjusted / faraday18.dailies.pmc.adjusted Rothera (67 34 S 68 08 W) Dec 2002 - Apr 2005 rot1.sl / rothera.daily.sea levels Apr 2005 - Apr 2007 rot2.sl .. Dec 2006 - Nov 2009 rot3.sl .. Dec 2009 - Dec 2011 rot4.sl .. Dec 2011 - Dec 2012 rot6.sl .. Dec 2012 - Jan 2014 rot7.sl .. Jan 2014 - Jan 2015 rot8.sl .. Jan 2015 - May 2015 rot9a.sl .. May 2015 - Dec 2015 rot9b.sl .. Jan 2016 - May 2019 rot10.sl .. Note: all the daily sea level files will be to the same local datum i.e. capable of being used for time series work. For the individual raw data files, please consult the appropriate documentation. Rothera guided wave radar data are supplied as follows: Jan 2016 - May 2019 rot10.radar.daily (daily means) rot10.radar.1min (1 min mean) Gibraltar (36.133333 N 5.35 W) 01-Oct-2006 31-Jan-2009 gib_rad_0609.acc 16-Feb-2009 22-May-2014 gibraltar_15_minutes_2009-2014 /daily values are not computed for these Gibraltar files - see below SHORT DOCUMENTATION FOR EACH DATA FILE ====================================== ASCENSION ========= This gauge is in English Bay, Ascension and is not to be confused with the Phase 1 pressure sensor which was in Clarence Bay. file ascn1.sl: -------------- channel 6 sea temperature (deg C) (*) 7 sub-surface pressure (mbar) (**) 8 barometric pressure (mbar) (**) 9 half-tide pressure (mbar) (**) 10 air temperature (deg C) 11 sea level (cm) with respect to "ASCENSION B-DATUM MAY 1993" recording frequency 15 minutes (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/ascn1.report). (*) See http://www.pol.ac.uk/ntslf/acclaimdata/readme.formats for a description of data file formats and a definition of channel number. Beware that data types (e.g. sea temperature) can be in different channels in each file. (**) Note that for this and all files in this directory, pressures as recorded by transducers are liable to long term drift. However, it is a feature of the half-tide gauge that reconstructed sea levels can be measured precisely to a land datum, whether any or all tranducers are drifting or even if the ocean density itself is varying. See Woodworth, P.L., Vassie, J.M., Spencer, R. and Smith, D.E. 1996. Precise datum control for pressure tide gauges. Marine Geodesy, 19(1), 1-20. file ascn2.sl: -------------- channel 6 sea temperature (deg C) 7 sub-surface pressure (mbar) 8 barometric pressure (mbar) 9 half-tide pressure (mbar) 10 air temperature (deg C) 11 sea level (cm) with respect to "ASCENSION B-DATUM MAY 1993" recording frequency 15 minutes (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/ascn2.report). file ascn3.sl: -------------- channel 6 sea temperature (deg C) 7 sub-surface pressure (mbar) 8 barometric pressure (mbar) 9 half-tide pressure (mbar) 10 air temperature (deg C) 11 sea level (cm) with respect to "ASCENSION B-DATUM MAY 1993" recording frequency 15 minutes (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/ascn3.report). file ascn4.sl: -------------- channel 6 sea temperature (deg C) 7 sub-surface pressure (mbar) 8 barometric pressure (mbar) 9 half-tide pressure (mbar) 10 air temperature (deg C) 11 sea level (cm) with respect to "ASCENSION B-DATUM MAY 1993" recording frequency 15 minutes there are gaps of about a week at the end of January and in mid-Feb 1996. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/ascn4.report). file ascn5.sl: -------------- Channel 6 Sea Temperature Deg C 7 Full Tide Total Pressure mBar 8 Barometer mbar 9 Half Tide Total pressure mBar 10 Air temperature Deg C 11 sea level (cm) with respect to "ASCENSION B-DATUM MAY 1993" recording frequency 15 minutes (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/ascn5.report). file asc6r.sl: -------------- This 'number 6 Ascension' file was updated 25 August 1998, using data from the logger, rather than the original telex data. The previous (telex) data file has been removed from this disk. This replaces and extend the previous (ASCN6) file based on telex information from March 1997 - January 1998. This file is from the gauge data logger and cover March 1997 - June 1998 after which the gauge was removed for reconcreting of the English Bay facility. Channel 6 Sea Temperature Deg C 7 Full Tide Total Pressure mBar 8 Barometer mbar 9 Half Tide Total pressure mBar 10 Air Temperature, Deg C 11 sea level (cm) with respect to "ASCENSION B-DATUM MAY 1993" recording frequency 15 minutes From a preliminary analysis it was clear that sometime around April 1998 the C transducer started to record pressure 5-10 cm larger than hitherto. This situation went back to more or less the norm shortly before the gauge was removed. Bob's explanation was that this is owing most likely to transducer deterioration. THIS MEANS THAT WHILE THE INFERRED SEA LEVEL DETERMINED BY THIS ANALYSIS IN THIS PERIOD AROUND APRIL-JUNE 1998 MAY BE OK, THE TOTAL PRESSURES ('C' PRESSURES) WILL BE TOO LARGE - ANYONE USING THAT CHANNEL DIRECTLY SHOULD BEWARE. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/asc6r.report). file ascn7.sl: -------------- This file has been deleted as it has been superceded by ascn8.sl. file ascn8.sl: -------------- These data were brought back by Ian Vassie and Peter Foden from the Ascension data logger. They refer to the first set of data from the new tide gauge at English Bay installed March 1999 by Bob Spencer, Ian Vassie et al. There was a large gap between the data in 'asc6r' which ended June 1998 and the start of this one. Note that the datum of the sea level measurements in channel 11 has changed by 0.8 cm from the old datum. (The new datum is 0.8 cm above the old one so these sea levels look 0.8 cm lower than they would have been.) Channel 6 : Sea temperature (deg C) Channel 7 : Full tide sub surface pressure (mbar) Channel 8 : Half tide sub surface pressure (mbar) Channel 9 : Air temperature (deg C) Channel 10: Air pressure (mbar) Channel 11 sea level (cm) with respect to "ASCENSION B-DATUM MARCH 1999" recording frequency 15 minutes The file 'ascn.daily.sea.levels' was updated using the old (1993) datum throughout (i.e. applying the 0.8 cm offset to the later data). Note that sea temperature from a second sensor on the 1/2 tide digiquartz is also available. Also note that the channel 7 full pressure signal has a 6 mbar jump during October 1999 which is not understood (probably a transducer problem) but this is calibrated out by the 'B gauge' procedure and the channel 11 sea level will be correct. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/ascn8.report). file ascna.sl: -------------- [Note that this file replaces and extends slightlythe older 'ascn9.sl' file now deleted from this directory] After April 2001 the gauge had instrumental problems which cause data loss which may be recueable with further work. Channel 6 : Sea Temp (deg C) Channel 7 : Full tide sub surface pressure (mbar) Channel 8 : Half tide sub surface pressure (mbar) Channel 9 : Air temperature (deg C) Channel 10: Air pressure (mbar) Channel 11: sea level (cm) with respect to "ASCENSION B-DATUM MARCH 1999" recording frequency 15 minutes The file 'ascn.daily.sea.levels' was updated using the old (1993) datum throughout (i.e. applying the 0.8 cm offset to the later data as described above for ascn8.sl). (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/ascna.report). files grouped under 'ascnb': ---------------------------- Data files between 'ascna' and 'ascng' had no half-tide pressure datum control and large apparent drifts in the full-tide pressure sensor. They may be useful for certain kinds of oceanography but are unsuitable at present for sea level. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/ascnb.report). file ascng.sl: -------------- This is the first data file from new 'all in one' B gauge. Channel 6 : zeros Channel 7 : Total pressure for full tide (millibars) Channel 8 : Total pressure for half tide (millibars) Channel 9 : Atmospheric temperature (deg C) Channel 10: Atmospheric pressure (millibars) Channel 11: sea level (cm) with respect to "ASCENSION B-DATUM SEPTEMBER 2005" recording frequency 15 minutes The file 'ascn.daily.sea.levels' was updated using the old (1993) datum throughout (i.e. applying a -0.4 cm offset to the later data). (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/ascng.report). file ascnh.sl: ============== This file was based on the total pressure and barometer data from the 'all in one' B gauge but with data from a radar gauge used to check datum stability as the B channel (channel 7) was not usable for datum control: Channel 1 Sequence Channel 2 Flag Channel 3 Year Channel 4 Day Channel 5 Hours Channel 7 Total pressure for half tide (mbars) Channel 6 Total pressure for full tide (mbars) Channel 8 New sensor atmospheric temperature (degs C) Channel 9 New sensor atmospheric pressure (mbars) Channel 10 Sea level (cm) Sea level here is with respect to the original "Ascension B-DATUM May 1993" recording frequency 15 minutes. The file 'ascn.daily.sea.levels' was updated using the old (1993) datum throughout. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/ascnh.report). files ascnj.sl and ascnk.sl: ============================ These files were from the 'all in one' bgauge. Note that there was a large gap between the J and K files and that the K file has many gaps large and small. Channel 6 : Sea temperature (deg C) Channel 7 : Atmospheric pressure (millibars) Channel 8 : Total pressure for full tide (millibars) Channel 9 : Total pressure for half tide (millibars) Channel 10 : Atmospheric temperature (deg C) Channel 11 : Sea level (cm) with respect to "ASCENSION B-DATUM SEPTEMBER 2005" recording frequency 15 minutes The file 'ascn.daily.sea.levels' was updated using the old (1993) datum throughout (i.e. applying a -0.4 cm offset to the later data). (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/ascnj/ascnj+k.report) files ascnl.sl: =============== This file was from the 'all in one' bgauge. Note that there was a large gap between the early 2010 and late 2010/early 2011 data. Channel 6 : Sea temperature (deg C) Channel 7 : Atmospheric pressure (millibars) Channel 8 : Total pressure for full tide (millibars) Channel 9 : Total pressure for half tide (millibars) Channel 10 : Atmospheric temperature (deg C) Channel 11 : Sea level (cm) with respect to "ASCENSION B-DATUM SEPTEMBER 2005" recording frequency 15 minutes The file 'ascn.daily.sea.levels' was updated using the old (1993) datum throughout (i.e. applying a -0.4 cm offset to the later data). (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/ascnl/ascnl.report) files ascnm.sl: =============== This file was made from the KPSI differential pressure gauge. Note that there is some overlap with ASCNL but because of the gaps in that this one is more complete. Channel 6 : radar values (cm) Channel 7 : sea level values from pressure sensor (cm) Channel 8 : half tide values from pressure sensor (cm) Channel 9 : water temperature Channel 10 : channel 6 minus channel 7 The sea level values in channel 7 are measured to a datum 870 mm below "ASCENSION B-DATUM MAY 1993", recording frequency 15 minute The radar values are not measured with respect to a particular datum. The file 'ascn.daily.sea.levels' was updated using the old (1993) datum throughout. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/ascnm/ascnm.report) file ascnn.sl: ============== This file was made with data from the KPSI differential pressure gauge. Note that there is some overlap with ASCNM but this will be slightly more accurate although there are many small data transmission gaps. Channel 6 : radar values (cm) Channel 7 : full sea level values (cm) Channel 8 : half tide values (cm) Channel 9 : blank Channel 10 : radar minus full The sea level values in channel 7 are measured to a datum 883 mm below "ASCENSION B-DATUM MAY 1993", recording frequency 15 minute The radar values are not measured with respect to a particular datum. The file 'ascn.daily.sea.levels' was updated using the old (1993) datum throughout. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/ascnn/ascnn.report) ======================================================================== Port Stanley ============ This Phase 2 gauge is at the eastern end of Port Stanley harbour by the 'floating warehouses'. The Phase 2 gauge was constructed as an upgrade of the Phase 1 sub-surface pressure arrangement. file stan2.sl: -------------- Channel 6 : Sea temperature (deg C) 7 : Total Sub-surface pressure (mbar) 8 : Barometric pressure (mbar) 9 : Half tide pressure (mbar) 10 : Air temperature (deg C) 11 : Sea level (cm) with respect to "STANLEY B-DATUM OCTOBER 1992" recording frequency 7.5 minutes The data in 'stan1.sl' (see below) were an early subset of 'stan2.sl'. They were based on hourly telex values, some of which had had to be time shifted (fairly successfully as it turned out) because of a timing error. The 'stan2.sl' data replace and extend those in 'stan1.sl', at the cost of a much larger file, as they are taken from the local data logger with 7.5 minute values. The differences to the earlier data of 'stan1.sl' are: (i) 7.5 minute values instead of hourly values. (ii) improved calibrations of all channels (except that air temperature was assumed to be 10 deg throughout as that was not recorded on the data logger. If it is required for any analysis, please contact us, lower level file information is included in /users/plw3/acclaim/stan1.report. The determined pressure values for the barometer have been shown to be not sensitive to air temperatures in the range 0-20 deg.) (iii) the barometer values are full integrations instead of 'spot readings'. (iv) timings include small clock drifts. The most obvious signal with 7.5 minute scans is the apparent seiching which might be interesting to investigate further. The derived daily values below vary by up to a cm compared to the 'stan1.sl' values, because of the improved pre-processing. The monthly means are the same to a few mm. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan2.report). file stan1.sl: -------------- channel 8 barometric pressure (mbar) <<< see above. 11 sea level (cm) with respect to "STANLEY B-DATUM OCTOBER 1992" recording frequency 60 minutes See comments above concerning more reliable data for this period in 'stan2.sl' at the expense of a considerably larger file. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan1.report). file sta3a.sl: -------------- Channel 6 : Sea temperature (deg C) 7 : Total Sub-surface pressure (mbar) 8 : Barometric pressure (mbar) 9 : Half tide pressure (mbar) 10 : Air temperature (deg C) 11 : Sea level (cm) with respect to "STANLEY B-DATUM OCTOBER 1992" recording frequency 15 minutes Sea temperature values are incorrect on day 323 1993 from 16.875 to 17.375 hours. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan3.report). file sta3b.sl: -------------- Channel 6 : Sea temperature (deg C) sensor DQ47594 7 : Total Sub-surface pressure (mbar) sensorDQ47594 8 : Barometric pressure (mbar) sensor QD36455 9 : Half tide pressure (mbar) sensor DQ47598 10 : Air temperature (deg C) sensor DQ36455 11 : Sea level (cm) with respect to a datum which is 7 cm BELOW the previous "STANLEY B-DATUM OCTOBER 1992" recording frequency 15 minutes In March 1994 (the start of this file and the end of 'sta3a.sl') the half tide pressure signal dropped by approximately 7 mbar because of corrosion in the copper datum tube. The consequences are the following: - The full tide pressures carry on as from the previous file, no change. - The half tide sensor has the drop in pressure mentioned above, this is for interest to calibration of the tide gauge only and not to sea level analysts. - The derived sea level in Channel 11 will be measured to a datum which is approximately 7 cm below that used previously i.e. the sea levels are 7 cm too large compared to before. Note that in the daily mean file 'stan.daily.sea.levels' this 7 cm has been accounted for and all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan3bcd.report). file sta3c.sl: -------------- Channel 6 : Sea temperature (deg C) 7 : Total Sub-surface pressure (mbar) 8 : Barometric pressure (mbar) 9 : Half tide pressure (mbar) 10 : Air temperature (deg C) 11 : Sea level (cm) with respect to a datum which is 7 cm BELOW the previous "STANLEY B-DATUM OCTOBER 1992" recording frequency 15 minutes Comments for this file with regard to the sea level datums are the same as those for sta3b.sl. Note that in the daily mean file 'stan.daily.sea.levels' this 7 cm has been accounted for and all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan3bcd.report). file sta3d.sl: -------------- Channel 6 : Sea temperature (deg C) 7 : Total Sub-surface pressure (mbar) 8 : Barometric pressure (mbar) 9 : Half tide pressure (mbar) 10 : Air temperature (deg C) 11 : Sea level (cm) with respect to a datum which is 7 cm BELOW the previous "STANLEY B-DATUM OCTOBER 1992" recording frequency 15 minutes Comments for this file with regard to the sea level datums are the same as those for sta3b.sl. Note that in the daily mean file 'stan.daily.sea.levels' this 7 cm has been accounted for and all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan3bcd.report). file sta3e.sl: -------------- Channel 6 : Sea temperature (deg C) 7 : Total Sub-surface pressure (mbar) 8 : Barometric pressure (mbar) 9 : Half tide pressure (mbar) 10 : Air temperature (deg C) 11 : Sea level (cm) with respect to a datum which is 7 cm BELOW the previous "STANLEY B-DATUM OCTOBER 1992" recording frequency 15 minutes Comments for this file with regard to the sea level datums are the same as those for sta3b.sl. Note that in the daily mean file 'stan.daily.sea.levels' this 7 cm has been accounted for and all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan3e.report). file sta3f.sl: -------------- Channel 6 SeaTemperature (Deg C) 7 Full Tide Total Pressure (mBar) 8 Half Tide Total Pressure (mbar) 9 Atmospheric Temperature (Deg C) 10 Barometric Pressure (mBar) 11 Sea level (cm) with respect to a datum which is 7 cm BELOW the previous "STANLEY B-DATUM OCTOBER 1992" recording frequency 15 minutes Comments for this file with regard to the sea level datums are the same as those for sta3b.sl. Note that in the daily mean file 'stan.daily.sea.levels' this 7 cm has been accounted for and all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan3f.report). file sta4.sl: ------------- Channel 6 : Sea temperature (deg C) Channel 7 : Total Sub-surface pressure DQ 47594 (mbar) Channel 8 : Half tide pressure DQ 47598 (mbar) Channel 9 : Air temperature (deg C) Channel 10 : Barometric pressure DQ 39329 (mbar) Channel 11 : Sea level (cm) with respect to a new datum called "STANLEY B-DATUM NOVEMBER 1998" recording frequency 15 minutes This new datum "STANLEY B-DATUM NOVEMBER 1998" is 1.5 cm below the old datum of "STANLEY B-DATUM OCTOBER 1992". Note that in the daily mean file 'stan.daily.sea.levels' all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan4.report). file sta5.sl: ------------- Channel 6 Sea Temperature from Full Tide sensor Channel 7 Full tide total pressure mBar Channel 8 Half tide total pressure mBar Channel 9 Atmospheric temperature Deg C Channel 10 Barometric pressure mBar Channel 11 : Sea level (cm) with respect to a new datum called "STANLEY B-DATUM NOVEMBER 1998" recording frequency 15 minutes This new datum "STANLEY B-DATUM NOVEMBER 1998" is 1.5 cm below the old datum of "STANLEY B-DATUM OCTOBER 1992". Note that in the daily mean file 'stan.daily.sea.levels' all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan5.report). (files sta6.sl and sta7.sl which used to be in this directory are now superseded by sta8.sl) file sta8.sl: ------------- Channel 6 Sea temperature (deg C) from full tide sensor Channel 7 Total pressure (mbars) for full tide Channel 8 Total pressure (mbars) for half tide Channel 9 Atmospheric (deg C) temperature Channel 10 Atmospheric (mbars) pressure Channel 11 : Sea level (cm) with respect to datum "STANLEY B-DATUM NOVEMBER 1998" recording frequency 15 minutes This datum "STANLEY B-DATUM NOVEMBER 1998" is 1.5 cm below the old datum of "STANLEY B-DATUM OCTOBER 1992". Note that in the daily mean file 'stan.daily.sea.levels' all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan8.report). file sta9.sl ------------ Information as for sta8.sl (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stan9.report). file staa.sl ------------ Information as for sta9.sl (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stana.report). file stab.sl ------------ Channel 6 empty Channel 7 Total pressure (mbars) for full tide Channel 8 Total pressure (mbars) for half tide Channel 9 Atmospheric (deg C) temperature Channel 10 Atmospheric (mbars) pressure Channel 11 : Sea level (cm) with respect to datum "STANLEY ALL-IN-ONE-DATUM NOVEMBER 2005" recording frequency 15 minutes This datum "STANLEY ALL-IN-ONE-DATUM NOVEMBER 2005" is 19.5 cm below the original datum of "STANLEY B-DATUM OCTOBER 1992". Note that in the daily mean file 'stan.daily.sea.levels' all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/stanb/stanb.report). file stac.sl ------------ Channel 6 empty Channel 7 Total pressure (mbars) for full tide Channel 8 Total pressure (mbars) for half tide Channel 9 Atmospheric (deg C) temperature Channel 10 Atmospheric (mbars) pressure Channel 11 : Sea level (cm) with respect to datum "STANLEY ALL-IN-ONE-DATUM NOVEMBER 2005" recording frequency 15 minutes This datum "STANLEY ALL-IN-ONE-DATUM NOVEMBER 2005" is 19.5 cm below the original datum of "STANLEY B-DATUM OCTOBER 1992". Note that in the daily mean file 'stan.daily.sea.levels' all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/stanc/stanc.report). Note that from inspection of these sea levels with those from a radar gauge also at Stanley, then from about 2008 day 200 the sea levels reported here may be about 1 cm too low. Also there is a gap in these B gauge data during October 2008 to early January 2009 - the daily values in 'stan.daily.sea.levels' have been filled in using that radar data. file stad.sl ------------ Channel 6 empty Channel 7 Total pressure (mbars) for full tide Channel 8 Total pressure (mbars) for half tide Channel 9 Atmospheric (deg C) temperature Channel 10 Atmospheric (mbars) pressure Channel 11 : Sea level (cm) with respect to datum "STANLEY ALL-IN-ONE-DATUM NOVEMBER 2005" recording frequency 15 minutes This datum "STANLEY ALL-IN-ONE-DATUM NOVEMBER 2005" is 19.5 cm below the original datum of "STANLEY B-DATUM OCTOBER 1992". Note that in the daily mean file 'stan.daily.sea.levels' all the values should be to the same datum i.e. "STANLEY B-DATUM OCTOBER 1992". (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/stand/stand.report). Note that from inspection of these sea levels with those from a radar gauge also at Stanley, then from about 2008 day 200 the sea levels reported here may be about 1 cm too low. Also the B gauge data in the file stad.sl ends in August 2009 so the daily values in 'stan.daily.sea.levels' have been continued with radar data up to May 2010. file stae.sl ------------ Channel 1 Sequence Channel 2 Flag Channel 3 Year Channel 4 Day Channel 5 Hour Channel 6 Sea level from radar gauge (cm) with missing values -99.00 This file comes from a Kalesto radar gauge. The sea level is inferred to be measured to a datum 123.119 cm below the orginal "STANLEY B-DATUM OCTOBER 1992". Daily values have been added to 'stan.daily.sea.levels' using the original (1992) datum. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/stane/stane.report). files staf.2012.sl, staf.2013.sl and staf.jan2014.sl ---------------------------------------------------- These files are in standard TASK format as above. The datum of the measurements is "STANLEY ALL-IN-ONE-DATUM NOVEMBER 2005" which is 19.5 cm below the original "STANLEY B-DATUM OCTOBER 1992". These files contain many short gaps due to Meteosat transmission gaps. Daily values have been added to 'stan.daily.sea.levels' using the original (1992) datum. These have been computed by interpolating between the residuals of a tidal analysis of the data, adding the interpolated values back to the tide to try to infer the original values, and then filtering the reconstructed time series. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/stanf/stanf.report). ======================================================================== Port Stanley Government Jetty (1964-69,74) (52 42 S 57 52 W) ============================================================ Files called 'stanley64' etc. in this directory are from the Lea float gauge operated at Government Pier Port Stanley from November 1964 as an arrangement between Fuchs and Irving. It was run by the Colonial Office to about 1975 but the quality of the records from 1970 is said to be poor. It was located inside the conference room at the west end of the Government Jetty in Stanley Harbour. The gauge still existed in some form up to about 1982. The tide gauge zero was Chart Datum which was 20.53 feet below the Benchmark on the Public Works Office (itself 20.1 feet above Ordnance Datum). The files are in TASK-2000 10-column format with sea level in cm in channel 6, and have been corrected for all typing errors after computerisation of hourly tabulations obtained from charts at the Hydrographic Office. The time zone for February 65 onwards is +4 (confirmed by tidal analysis). However, that for November 64 - January 65 is almost certainly +3. We have not changed the time zones in these files, and if they are required for tidal analysis purposes we suggest that data for only 66-69 are used. As mentioned above, the Tide Gauge Zero was 6.258 m (20.53 ft) below the PWD BM. The "STANLEY B-DATUM OCTOBER 1992" used for more recent data is 5.05 m below the PWD BM. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/stanley.oldgauge/report). ======================================================================== St.Helena ========= This Phase 2 gauge is located in Jamestown Harbour by the Landing Steps. file sthl1.sl: -------------- channel 6 sea temperature (deg C) 7 sub-surface pressure (mbar) 8 barometric pressure (mbar) 9 half-tide pressure (mbar) 10 air temperature (deg C) 11 sea level (cm) with respect to "ST.HELENA B-DATUM JUNE 1993" recording frequency 15 minutes Following this file, there is a data gap between September and November 1993 when 'sthl2.sl' starts, owing to a gauge malfunction. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/sthl1.report). First scan : 1 17.125 hrs, day 156 (05 June) 1993 Last scan : 9362 5.375 hrs, day 254 (11 September) 1993 Harmonic analysis (on the full tide pressure record) gives the following: MAJOR CONSTITUENTS NSIG= 27 ------------------ NO NAME SPEED H G -- ---- ----- --- --- 1 Z0 0.0000000 1174.7178 0.000 4 Q1 13.3986609 0.7462 139.218 5 O1 13.9430356 1.9391 190.249 7 K1 15.0410686 3.4818 341.608 11 N2 28.4397295 6.6106 71.889 12 M2 28.9841042 32.4941 79.547 14 S2 30.0000000 10.6180 102.432 17 M3 43.4761563 0.1916 90.118 file sthl2.sl: -------------- channel 6 sea temperature (deg C) 7 sub-surface pressure (mbar) 8 barometric pressure (mbar) 9 half-tide pressure (mbar) 10 air temperature (deg C) 11 sea level (cm) with respect to "ST.HELENA B-DATUM JUNE 1993" recording frequency 15 minutes (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/sthl2.report). First scan : 1 10.375 hrs, day 323 (19 November) 1993 Last scan : 42469 19.375 hrs, day 35 (04 February) 1995 Harmonic analysis (on the full tide pressure record) gives the following: MAJOR CONSTITUENTS NSIG= 63 ------------------ NO NAME SPEED H G -- ---- ----- --- --- 1 ZO 0.0000000 1176.5487 0.000 2 SA 0.0410686 3.7366 35.910 3 SSA 0.0821373 1.4286 63.077 9 Q1 13.3986609 0.8536 136.940 11 O1 13.9430356 2.0333 188.022 16 P1 14.9589314 0.8909 337.167 18 K1 15.0410686 3.4961 349.605 29 N2 28.4397295 6.6613 70.851 32 M2 28.9841042 32.3452 79.896 37 S2 30.0000000 10.4069 99.520 39 K2 30.0821373 3.1127 94.645 44 M3 43.4761563 0.1815 77.375 file sthl3.sl: -------------- channel 6 sea temperature (deg C) 7 sub-surface pressure (mbar) 8 barometric pressure (mbar) 9 half-tide pressure (mbar) 10 air temperature (deg C) 11 sea level (cm) with respect to "ST.HELENA B-DATUM JUNE 1993" recording frequency 15 minutes (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/sthl3.report). First scan : 1 22.875 hrs, day 35 (04 February) 1995 Last scan : 25019 13.375 hrs, day 296 (22 October ) 1995 Harmonic analysis (on the full tide pressure record) gives the following: MAJOR CONSTITUENTS NSIG= 55 ------------------ NO NAME SPEED H G -- ---- ----- --- --- 1 ZO 0.0000000 1191.9762 0.000 2 SSA 0.0821373 1.4813 127.376 8 Q1 13.3986609 0.9814 141.692 10 O1 13.9430356 2.1082 189.855 14 P1 14.9589314 1.1500 327.252 15 K1 15.0410686 3.4442 341.654 25 N2 28.4397295 6.6267 70.934 28 M2 28.9841042 32.1134 79.415 32 S2 30.0000000 9.4447 96.911 33 K2 30.0821373 3.0532 96.244 38 M3 43.4761563 0.1856 82.922 file sth4u.sl: -------------- Channel 6 Barometer mbar 7 Air temperature Deg C 8 Sea Temperature Deg C 9 Full Tide Total Pressure mBar 10 Half Tide Total pressure mBar 11 sea level (cm) with respect to "ST.HELENA B-DATUM JUNE 1993" recording frequency 15 minutes This file replaced the file 'sthl4.sl' which used to be in this directory. That file was based on satellite-telexed information, rather than the data logger values in this file. There is no significant difference in the data as such, but the data logger file is more complete owing to occasional satellite drop outs. The St.Helena gauge stopped working in October 1996 owing to harbour works. It was reinstalled in March-April 1997. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/sth4u.report). First scan : 1 15.875 hrs, day 296 (23 October) 1995 Last scan : 33984 15.625 hrs, day 285 (11 October) 1996 Harmonic analysis (on the full tide pressure record) gives the following: MAJOR CONSTITUENTS NSIG= 58 ------------------ NO NAME SPEED H G -- ---- ----- --- --- 1 ZO 0.0000000 1176.7390 0.000 4 Q1 13.3986609 0.9506 152.371 6 O1 13.9430356 2.0402 190.211 11 P1 14.9589314 0.9035 338.647 13 K1 15.0410686 3.4576 349.055 24 N2 28.4397295 6.6810 70.728 27 M2 28.9841042 32.5099 80.037 32 S2 30.0000000 10.2497 100.474 34 K2 30.0821373 3.0314 96.528 39 M3 43.4761563 0.1929 76.339 file sthl5.sl: -------------- channel 6 sea temperature (deg C) 7 sub-surface pressure (mbar) 8 barometric pressure (mbar) 9 half-tide pressure (mbar) 10 air temperature (deg C) 11 sea level (cm) with respect to "ST.HELENA B-DATUM APRIL 1997" recording frequency 15 minutes This gauge was reinstalled in April 1997, with new software allowing data to be downloaded by telephone. This new installation has a new 'B' level, which is known relative to the old one through levelling. Daily and monthly means stored in the file 'sthl.daily.sea.levels' have been corrected to the earlier datum. THE NEW DATUM IS REFERRED TO AS 'St Helena B-datum, April 1997', AND IS 18.0 cm ABOVE the previous 'St Helena B-datum, June 1993'. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/sth5l.report). First scan : 1 11.375 hrs, day 97 (07 April ) 1997 Last scan : 23739 17.899 hrs, day 344 (10 December) 1997 Harmonic analysis (on the full tide pressure record) gives the following: MAJOR CONSTITUENTS NSIG= 55 ------------------ NO NAME SPEED H G -- ---- ----- --- --- 1 ZO 0.0000000 1158.5645 0.000 2 SSA 0.0821373 2.3565 82.270 8 Q1 13.3986609 0.9144 153.687 10 O1 13.9430356 2.0272 191.810 14 P1 14.9589314 0.8876 329.593 15 K1 15.0410686 3.6389 346.743 25 N2 28.4397295 6.7228 71.759 28 M2 28.9841042 32.4684 79.996 32 S2 30.0000000 10.4113 100.604 33 K2 30.0821373 3.2259 95.706 38 M3 43.4761563 0.2231 77.424 file sthl6.sl: -------------- channel 6 sea temperature (deg C) 7 sub-surface pressure (mbar) 8 barometric pressure (mbar) 9 half-tide pressure (mbar) 10 air temperature (deg C) 11 sea level (cm) with respect to "ST.HELENA B-DATUM APRIL 1997" recording frequency 15 minutes This data set continues that of STHL5 i.e. derived from Pete Foden's new telephone software. Note also the new 'B level' of STHL5 compared to the earlier ones. There is a gap of a few weeks between the end of STHL5 and the start of STHL6 because of problems with the new software over the Christmas period. There will also be a short gap between the end of STHL6 and the next set of data which corresponds to the visit of Bob Spencer and Pete Foden to rearrange the electronics in the harbourside building following redevelopment of the waterfront. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/sth6l.report). First scan : 1 12.649, day 20 (20 January) 1998 Last scan : 17003 15.167, day 197 (16 July ) 1998 Harmonic analysis (on the full tide pressure record) gives the following: MAJOR CONSTITUENTS NSIG= 55 ------------------ NO NAME SPEED H G -- ---- ----- --- --- 1 ZO 0.0000000 1160.4285 0.000 2 SSA 0.0821373 1.3762 81.389 8 Q1 13.3986609 0.9179 155.176 10 O1 13.9430356 2.1735 189.329 14 P1 14.9589314 1.1327 327.663 15 K1 15.0410686 3.4028 347.562 25 N2 28.4397295 6.5345 70.011 28 M2 28.9841042 32.2462 79.153 32 S2 30.0000000 10.5656 98.915 33 K2 30.0821373 3.4026 94.042 38 M3 43.4761563 0.2162 66.227 file sthl7.sl: -------------- Channel 6: Sea temperature (deg C) Channel 7: Total pressure (mbar) Channel 8: Barometric pressure (mbar) Channel 9: Half tide sea pressure (mbar) Channel 10: Air temperature (deg C) Channel 11: Sea level (cm) with respect to "ST.HELENA B-DATUM APRIL 1997" recording frequency 15 minutes This data set continues that of STHL6. The data were collected from the data logger during a visit by Pete Foden and Ian Vassie and were processed by Ian and Phil Axe. As mentioned above, datum now in used 'St Helena B-datum, April 1997' is 18.0 cm ABOVE the original 'St Helena B-datum, June 1993' which is used throughout for the daily file 'sthl.daily.sea.levels'. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/sthl7.report). file sthl8.sl: -------------- Channel 6: Sea temperature (deg C) Channel 7: Total pressure (mbar) Channel 8: Half tide sea pressure (mbar) Channel 9: Air temperature (deg C) Channel 10: Barometric pressure (mbar) Channel 11: Sea level (cm) with respect to "ST.HELENA B-DATUM APRIL 1997" recording frequency 15 minutes As mentioned above, datum now used 'St Helena B-datum, April 1997' is 18.0 cm ABOVE the original 'St Helena B-datum, June 1993' which is used throughout for the daily file 'sthl.daily.sea.levels'. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/sthl8.report). This file goes up to October 2001, after which a rock fall destroyed power supplies to the gauge so that there will be a gap until August 2002. In addition, the gauge was taken out by the local people and reinstalled in the gap which will require special attention to the reinstalled datum in the next batch of data. file sthl9.sl: -------------- This file is from after the gauge was replaced by the local people, we assume to the same datum: Channel 6 Sea temperature from full tide sensor (degs C) Channel 7 Total pressure for full tide (mbars) Channel 8 Total pressure for half tide (mbars) Channel 9 Atmospheric temperature (degs C) Channel 10 Atmospheric pressure (mbars) Channel 11: Sea level (cm) with respect to "ST.HELENA B-DATUM APRIL 1997" recording frequency 15 minutes As mentioned above, datum now used 'St Helena B-datum, April 1997' is 18.0 cm ABOVE the original 'St Helena B-datum, June 1993' which is used throughout for the daily file 'sthl.daily.sea.levels'. (For more information inside POL, consult PSMSL ACCLAIM files and /users/plw3/acclaim/sthl9.report). file sthla.sl: -------------- This file overlaps STHL9 slightly and runs to the end of 2006 although with very big gaps: Channel 6 Sea temperature from full tide sensor (degs C) Channel 7 Total pressure for full tide (mbars) Channel 8 Total pressure for half tide (mbars) Channel 9 Atmospheric temperature (degs C) Channel 10 Atmospheric pressure (mbars) Channel 11: Sea level (cm) with respect to "ST.HELENA B-DATUM APRIL 1997" recording frequency 15 minutes As mentioned above, datum now used 'St Helena B-datum, April 1997' is 18.0 cm ABOVE the original 'St Helena B-datum, June 1993' which is used throughout for the daily file 'sthl.daily.sea.levels'. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/sthla/sthla.report). ======================================================================== Faraday (or Argentine Islands or Vernadsky) ======= For data up to December 1995 ---------------------------- The data described here were obtained from measurements from a conventional float and stilling well gauge operated by the British Antarctic Survey and the Proudman Oceanographic Laboratory. Hourly values of sea level were read off the paper charts and entered into computer files. Faraday has the longest tide gauge record in Antarctica starting 1958. The data in the files listed below cover 1984-95 (i.e. the 'satellite era') and are the result of a reanalysis of BAS-supplied data performed by the PSMSL (Woodworth and Spencer). The datum of the files below is the "Post 1970 Tide Pole Zero" (more information is contained in a PSMSL internal note). The complete record of Faraday monthly mean values is included in the PSMSL data set. However, for information on acquiring the complete set of hourlies or dailies, please mail the PSMSL. Files are: faraday.hourlies.pmc.adjusted with sea level in channel 11 of ACCLAIM format. faraday.dailies.pmc.adjusted and faraday.monthlies.pmc.adjusted where the 'pmc.adjusted' flags that ad hoc adjustments have been made to constrain the hourly chart measurments to the tide pole values. Data for 1996-1997 ------------------ Similar data as described above were obtained from scientists at the Faraday base (now called Vernadsky and operated by scientists from the Ukraine). The files are called as below and the same comments on datums apply: faraday9697.hourlies.pmc.adjusted with sea level in channel 6 of TASK-2000 format. faraday9697.dailies.pmc.adjusted and faraday9697.monthlies.pmc.adjusted Data for 1998-1999 ------------------ Similar data as described above were obtained from scientists at the Faraday base (now called Vernadsky and operated by scientists from the Ukraine). The files are called as below and the same comments on datums apply: faraday98.hourlies.pmc.adjusted with sea level in channel 6 of TASK-2000 format. faraday98.dailies.pmc.adjusted and faraday98.monthlies.pmc.adjusted faraday99.hourlies.pmc.adjusted with sea level in channel 6 of TASK-2000 format. faraday99.dailies.pmc.adjusted and faraday99.monthlies.pmc.adjusted Data for 2000-2016 ================== corresponding files as for 1999 but headed faraday00, faraday01, etc. Data for 2017 onwards ===================== Files are headed as before, but hourlies files now include a tidal prediction in channel 7 and a non-tidal residual in channel 8. ========================================================================= Rothera ======= file rot1.sl ------------ These data are from a 'B gauge' installed at the British Antarctic Survey Rothera base in 1998 but for which decent 'B gauge' data did not become available until 2002. Only some channels are available from the start of 2002, all channels towards the end of the year. Data run to middle of 2005. Channel 6 Sea temperature from full tide sensor (degs C) Channel 7 Total pressure for full tide (mbars) Channel 8 Total pressure for half tide (mbars) Channel 9 Atmospheric temperature (degs C) Channel 10 Atmospheric pressure (mbars) Channel 11 Sea level (cm) with respect to ""ROTHERA B-DATUM DECEMBER 2002" recording frequency 15 minutes Daily sea levels to same datum are in 'rothera.daily.sea.levels'. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/rothera1/rothera1.report). file rot2.sl ------------ This file follows from the previous one with the same format. Daily sea levels to same datum are in 'rothera.daily.sea.levels'. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/rothera2/rothera2.report). file rot3.sl ------------ This file follows from the previous one with the same format. Daily sea levels to same datum are in 'rothera.daily.sea.levels' (those for the overlap period for 'rot2' and 'rot3' differed by less than +/- 2 mm so 'rot2' ones were kept and new 'rot3' ones added. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/rothera3/rothera3.report). file rot4.sl ------------ This file follows from the previous one. It has the format: Channel 6 Sea temperature from full tide sensor (degs C * 10) Channel 7 Total pressure for full tide (mbars) Channel 8 Total pressure for half tide (mbars) Channel 9 Atmospheric temperature (degs C * 10) Channel 10 Atmospheric pressure (mbars) Channel 11 Sea level (cm) with respect to ""ROTHERA B-DATUM DECEMBER 2002" recording frequency 15 minutes Daily sea levels to same datum are in 'rothera.daily.sea.levels'. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/rothera4/rothera4.report). files rot6.sl and rot7.sl (note there is no rot5.sl) ---------------------------------------------------- These files follows from the previous one. It has the format: Channel 6 Sea temperature from full tide sensor(°C*100) 7 Total pressure from full tide sensor (mbar) 8 Total pressure from half tide sensor (mbar) 9 Air temperature in tide gauge hut(°C*100) 10 Air presssure in tide gauge hut (mbar) Channel 11 Sea level (cm) with respect to ""ROTHERA B-DATUM DECEMBER 2002" recording frequency 15 minutes Daily sea levels to same datum are in 'rothera.daily.sea.levels'. (For more information inside POL, consult PSMSL ACCLAIM files and /work/plw/plw3/acclaim/rothera6/rothera6.report). file rot8.sl ------------ This files follows from the previous one. It has the format: Channel 6 Sea temperature from full tide sensor(°C*100) 7 Total pressure from full tide sensor (mbar) 8 Total pressure from half tide sensor (mbar) 9 Air temperature in tide gauge hut(°C*100) 10 Air presssure in tide gauge hut (mbar) Channel 11 Sea level (cm) with respect to ""ROTHERA B-DATUM DECEMBER 2002" recording frequency 15 minutes Daily sea levels to same datum are in 'rothera.daily.sea.levels'. (For more information inside NOC, consult PSMSL ACCLAIM files and /work/anhi/south_atlantic/rothera/2014_logger/readme2014). file rot9a.sl ------------ This files follows from the previous one. It has the format: Channel 6 Sea temperature from full tide sensor(°C*100) 7 Total pressure from full tide sensor (mbar) 8 Total pressure from half tide sensor (mbar) 9 Air temperature in tide gauge hut(°C*100) 10 Air presssure in tide gauge hut (mbar) Channel 11 Sea level (cm) with respect to ""ROTHERA B-DATUM DECEMBER 2002" recording frequency 15 minutes Daily sea levels to same datum are in 'rothera.daily.sea.levels'. (For more information inside NOC, consult PSMSL ACCLAIM files and /work/anhi/south_atlantic/rothera/2015-18_gumstix/readme2015a). Note that the data for 2015 are split into segments a and b. The logger failed during the early part of 2015 and locally stored data were lost, so 2015a is constructed from data received via email before the failure. Timings cannot be verified independently. file rot9b.sl ------------ This files follows from the previous one. It has the format: Channel 6 Sea temperature from full tide sensor(°C*100) 7 Total pressure from full tide sensor (mbar) 8 Total pressure from half tide sensor (mbar) 9 Air temperature in tide gauge hut(°C*100) 10 Air presssure in tide gauge hut (mbar) Channel 11 Sea level (cm) with respect to ""ROTHERA B-DATUM DECEMBER 2002" recording frequency 15 minutes Daily sea levels to same datum are in 'rothera.daily.sea.levels'. (For more information inside NOC, consult PSMSL ACCLAIM files and /work/anhi/south_atlantic/rothera/2015_logger/readme2015b). Note that the data for 2015 are split into segments a and b. Time series b was downloaded from the datalogger, so timings can be verified. file rot10.sl ------------ This files follows from the previous one, but has different column order: Channel 6 Total pressure from full tide sensor (mbar) 7 Sea temperature from full tide sensor(°C*100) 8 Total pressure from half tide sensor (mbar) 9 Air temperature in tide gauge hut(°C*100) 10 Air presssure in tide gauge hut (mbar) Channel 11 Sea level (cm) with respect to ""ROTHERA B-DATUM DECEMBER 2002" recording frequency 15 minutes Daily sea levels to same datum are in 'rothera.daily.sea.levels'. (For more information inside NOC, consult PSMSL ACCLAIM files and /work/anhi/south_atlantic/rothera/2016-18_allsensors/readme2016-18). file rot10.radar.1min ---------------------- A VegaFlex guided wave radar was installed at Rothera in December 2015. This file contains quality controlled 1 minute data from that gauge. The number of samples was changed from 50 per min on 04/03/16 at 11:36 to 30 per min and was again changed on 28/09/16 08:43 to 20 per min. There is no detectable change in the time series resulting from these changes, but time stamps reflect these alterations. From 28/09/16 08:43 1 min data are averages of 20 samples taken over the first 30 s of each minute and are timestamped at the centre of the averaging period. They are to a theoretical datum, 5000 mm below the radar measuring point and 4641 mm below the b gauge benchmark. Data have been corrected for a 9 mm instrumental offset. Daily sea levels from the same radar gauge are in the file rot10.radar.daily (For more information inside NOC, consult PSMSL ACCLAIM files and /work/anhi/south_atlantic/rothera/2016-18_allsensors/readme2016-18). ========================================================================= Station: Gibraltar (GLOSS No. 248) ================================== A Kalesto radar gauge was installed and operational from September 2005.An additional 'B' gauge was installed in February 2009 consisting of 2 KPSI differential pressure sensors (one at the half tide level and one at the full tide level), but the full tide sensor exhibited long-term drift due to biofouling. file gib_rad_0609.acc --------------------- This file is in ACCLAIM format with one data channel (channel 6): sea level obtained from the radar gauge (cm). All data appear to be of good quality and have been screened for spikes. Data were supplied at 15 minute intervals and have not undergone any filtering. Sea level in this file is measured to Chart Datum. file gibraltar_15_minutes_2009-2014 ----------------------------------- This file is in ACCLAIM format with 15 minute values made from the one minute values recorded and transmitted to the IOC Sea Level Monitoring Facility in Ostende. channel 6: this has sea level (cm) from the half-tide pressure sensor that is used to provide a datum to the radar measurements channel 7: sea level from the radar gauge (cm) channel 8: channel 7 - channel 6 The radar sea level in this file is considered on the basis of the half-tide sensor evidence to be measured to Chart Datum up to 14 May 2009, and then to a datum which is 0.063 metres below Chart Datum thereafter. Note that inspection of residuals shows several 'square flat top' signals in the periods 27 Jan - 11 Feb, 11-19 Mar and 27 Mar - 4 Apr 2011 which may have been from something moored under the radar gauge. These short periods could be disregarded if necessary. Daily values are not provided for either of these files as the Kalesto has many small gaps which make conventional filtering less effective.