QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 02 Dec 2019 Station : Carnarvon Latitude: 24 53.9S Country : Australia Longitude: 113 39.1E JASL # : 167A Time Meridian: 120E (GMT + 8 hr) GLOSS # : 052 Originator #: 62370 NODC #: 32114301 Contributor : National Tidal Centre, Bureau of Meteorology PO Box 421 Kent Town SA 5071 South Australia AUSTRALIA Originator : Government of Western Australia Dept. of Planning and Infrastructure Original Data: analog Instrmnt Type: Fischer and Porter float/stilling well Digitzd Intvl: 15 minutes Present Data : Hourly, daily, and monthly values obtained by: Hourly : a raupach filter with half amplitude point of 0.42 cph 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 : 07 Apr 1984 - 22 Oct 2018 Gaps > 1 mon : 13 Oct 1984 - 11 Dec 1984;01 Jan 1985 - 07 Feb 1985 30 Oct 1985 - 16 Jan 1986;14 Mar 1986 - 15 Aug 1986 26 Aug 1986 - 07 May 1989;04 Aug 1990 - 24 Sep 1990 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 1984-2018 Refernce Levl: The sea level heights are referred to the zero point assigned to the tide station. Benchmark information is available upon request from the contributors. The primary Tide Gauge Benchmark is "Peg 13", the top of a section of rail in concrete between locomotive rails about 10m east of the abutment of Main Jetty. Tide Gauge Zero (TGZ) = 4.892m below TGBM TGBM = 0.814m below Australian Height Datum (AHD) Existing holdings in JASL 1984-2004 were adjusted +140 mm to link to the zero assigned to the update of 2005-2012 provided in May 2013 by NTC. Comment : The daily and monthly values are reasonable and do not reveal any obvious reference level shifts. Some of the questionable fluctuations noted below may be associated with meteorological events. The daily means agree well with altimetry. SPECIAL NOTE TO USERS OF NAT. 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CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1984 56 174-177,287-347 none 123-125,195-208,237- 247,284-286,347-352, 354-364 1985 74 1-39,244-256, (02)165-(22)165 47,102-103,194,201, 289-294,303-365 217-218,238,258-259, 282,289 1986 18 1-16,73-227 none 23-24,28,43-46,51, 239-365 225-227 1987 0 1-365 none none 1988 0 1-366 none none 1989 63 1-127,163-173 none none 1990 86 216-267 none none 1991 96 162-164,182-184, none none 217-226,240-244 1992 100 none none none 1993 100 none none none 1994 100 none none none 1995 100 none none none 1996 100 none none none 1997 100 none none none 1998 100 none none none 1999 93 309-334 (13)081-(01)082 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 13-15,150-151 none none 2011 100 none none none 2012 93 157-177,192-198 none none 2013 99 307-312 none none 2014 100 none none none 2015 99 74-77 (16)238-(03)239 none 2016 99 195-197 (08)051-(06)052 none (17)052-(03)053 2017 95 222-241 (16)365-(23)365 none 2018 78 280-290 none none