QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL Updated: 24 Oct 2019 Station : Cocos Latitude: 12 07.0S Country : Australia Longitude: 096 53.5E JASL # : 171A Time Meridian: 105E (GMT + 6.5 hr) GLOSS # : 046 Originator #: ID071016 NODC #: 31092601 Contributor : CSIRO (1985-1992) Division of Oceanography GPO Box 1538 Hobart, Tasmania 7001 and National Tidal Centre, Bureau of Meteorology PO Box 421 Kent Town SA 5071 South Australia AUSTRALIA in collaboration with National Ocean Service (NOS) National Ocean. and Atmos. Administration (NOAA) N/OES22 SSMC4, STATION 7109 1305 East West Highway Silver Spring, MD. 20910-3233 USA Originator : same; Australian Baseline Sea Level Monitoring Project Original Data: digital Instrmnt Type: 1) 11/Dec/1985-3/Sep/1992: Float/well system Stevens (LS) analog-to-digital recorder, compensator spring model 2) Aquatrak acoustic sensor (4/Sep/1992+) with Sutron Logger (SL) until 03/Sep/2009 then with Telmet T320 Aquatrak Controller (TAC) Digitzd Intvl: 6 minute (11/DEC/1985-23/MAY/1990); 15 minute (16/AUG/1990-3/SEP/1992); TAC: Weighted average of 4, 1-minute readings; 1-minute reading is average of 60, 1-sec samples SL: used 6-minute samples average of 181, 1-second samples. Present Data : Hourly, daily, and monthly values obtained by: Hourly : three-point Hanning centered on the hour (1985-89); Cosine-Lanczos centered on the hour (1990+) with a cut-off of 2 hours Daily : 119-point convolution filter (Bloomfield, 1976) centered on noon applied to the hourly data with respective periods of the 95, 50, and 5% amplitude points at 124.0, 60.2, and 40.2 hours Monthly: Simple average of all daily values; calculated if 7 or fewer days are missing Span of data : 11 Dec 1985 - 31 Dec 2018 Gaps > 1 mon : 31 Jul 1988 - 01 Jan 1989;23 May 1990 - 16 Aug 1990 01 Nov 1991 - 03 Dec 1991;01 Jul 1992 - 04 Sep 1992 01 Dec 1994 - 31 Dec 1994;16 Jul 2018 - 11 Oct 2018 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1985-2018 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks. The datum is 2.410m below PSM101. Vertical Reference Frame: Tide Gauge Zero (m) TGBM Name/Number: SEAFRAME sensor benchmark TGBM Elevation relative to the vertical reference: 3.5536m TGZ Comment : The daily and monthly means reveal no apparent reference level changes or trends. SPECIAL NOTE TO USERS OF NAT. TIDAL CENTRE DATA: As a user of this information, you are deemed to have read and accepted the conditions described in the Copyright Notice and Disclaimer at: http://www.bom.gov.au/other/copyright.shtml CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1985 6 none none none 1986 100 none none 49-52 1987 97 56-59,78-83, (17)027-(06)028 none 114-118,168-170 (12)180-(09)181 1988 58 213-366 none 30-31,139-140 1989 99 1 none none 1990 76 127-130,143-228 none none 1991 91 305-337 none none 1992 80 100-102,122-129, none none 183-248 1993 100 none none none 1994 92 335-365 none none 1995 99 74-75 none none 1996 100 none none none 1997 100 none none none 1998 100 none none none 1999 99 50-55,59-60 none none 2000 100 none none none 2001 100 none none none 2002 100 none none none 2003 100 none none none 2004 100 none none none 2005 100 none none none 2006 100 none none none 2007 100 none none none 2008 100 none none none 2009 99 262-264 none none 2010 100 none none none 2011 95 346-365 none none 2012 98 1-8 none none 2013 100 none none none 2014 99 20-22,327-328 none none 2015 99 94-97 none none 2016 91 166-188,190-193,211- none none 216,218-221 2017 100 none none none 2018 75 47-50,188-190,197- none none 284,361-362