QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 22 Oct 2019 Station : Funafuti-B Latitude: 08 30.2S Country : Tuvalu Longitude: 179 12.6E JASL # : 025B Time Meridian: 180E (GMT + 12 hr) GLOSS # : 121 Originator #: ID070006 NODC #: 30178901 Contributor : National Tidal Centre, Bureau of Meteorology PO Box 421 Kent Town SA 5071 South Australia AUSTRALIA Originator : same Original Data: digital Instrmnt Type: Aquatrak acoustic gauge (SEAFRAME) Digitzd Intvl: 6 minutes (average of 181 one minute samples) Present Data : Hourly, daily, and monthly values obtained by: Hourly : Cosine-Lanczos filter with cutoff of 120 min. 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 : 24 Mar 1993 - 31 Dec 2018 Gaps > 1 mon : 01 Apr 1993 - 12 May 1993;13 Sep 1993 - 04 Nov 1993 10 Jun 2012 - 20 Aug 2012 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1993-2018 Refernce Levl: All heights have been referred to the station Tide Gauge Zero (TGZ), which is linked to fixed bench marks. The height datum is derived from UH1 in 1993 survey. Reduced Levels based on Chart Datum derived from RNZN BM2 in 1993 are available. Height of Seaframe Sensor Bench Mark (SSBM) above TGZ is 5.2468m. Series 025A is separate from 025B because they are at different locations. Comment : At some time in the future, a single series from 025A and 025B will be created. At present, use of data for the years of overlap are at the discretion of the data users. High resolution coordinates are: Lat: 08 deg 30 min 10 sec S Lon: 179 deg 12 min 33 sec E The station is in the district of Fongafale. The daily and monthly means reveal no apparent changes in the reference level and agree with Honiara and Penrhyn. The NTC gauge is about 1.5 miles from UHSLC gauge. 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 ---- --- -------------------- --------------- -------------------- 1993 52 91-132,256-308, (02)335-(00)336 none 339-365 1994 87 1,207-230 (19)160-(06)161 none 1995 98 69-74,91-93,355-356 none none 1996 100 none none none 1997 100 none none none 1998 98 230-235,272-273 (00)254-(20)254 none 1999 100 none 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 100 none none none 2010 99 71-72,155-158 none none 2011 100 none none none 2012 77 4-10,162-233,238- (17)251-(05)252 none 239,252-258,269-270 (22)259-(10)260 (22)263-(05)264 (20)275-(12)276 2013 96 24-26,31-33,157-161, (22)033-(20)034 none 297-306 2014 98 261-269 none none 2015 100 none none none 2016 100 none none none 2017 94 276-298 none none 2018 100 none none none