QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 13 Aug 2020 Station : Marsden Point Latitude: 35 50.0S Country : New Zealand Longitude: 174 30.0E JASL # : 398A Time Meridian: 180E (GMT + 12 hr) GLOSS # : none Originator #: 079 NODC #: 33175401 Contributor : Land Information New Zealand Lambton House 160 Lambton Quay PO Box 5501 Wellington, New Zealand Originator : Northland Regional Council, Harbour Master Private Bag 9021, Whangarei, New Zealand Original Data: digital Instrmnt Type: unconfirmed Digitzd Intvl: operator selective, normally 5 minutes Present Data : Hourly, daily, and monthly values obtained by: Hourly : manual extraction of hourlies from digital record 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 : 19 Oct 1975 - 31 Dec 2019 Gaps > 1 mon : 03 Apr 1977 - 15 May 1977;30 May 1978 - 14 Jul 1978 02 Jan 1979 - 06 May 1980;01 Feb 1981 - 03 May 1981 05 Jul 1981 - 04 Jan 1982;04 Jul 1982 - 04 Oct 1982 25 Apr 1983 - 07 Aug 1983;09 Oct 1983 - 31 Dec 1984 31 May 1990 - 31 Dec 1990;24 Jun 1996 - 31 Dec 1996 18 Feb 1999 - 08 Aug 1999;16 Jan 2011 - 31 Mar 2011 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 1975-2019 Refernce Levl: The sea level heights are referred to the Tide Gauge Zero (TGZ): TGZ is 4.816 m below the RNZN benchmark (LINZ code DJM9), an iron bolt set in concrete near the base of the light standard on the inshore east end of the Northport Ltd pier near the launch steps. Comment : The daily and monthly values do not show any obvious shifts or trends. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1975 20 none none none 1976 97 11-18,233-238 (13)110-(21)110 166-167 (13)116-(20)116 (17)168-(00)169 1977 84 93-135,189-191,275- (21)198-(20)199 21-23,47-49 282,338-346 (09)268-(20)268 1978 82 106-113,127-129,150- (00)255-(20)255 94-99,146-150 195,211-222,230-232 (11)290-(20)290 (09)359-(06)360 1979 1 2-365 none none 1980 54 1-127,147-153,216- (13)132-(20)132 none 244,251-258 (23)285-(22)286 (05)342-(20)342 1981 22 32-123,130-137,158- none none 165,186-365 1982 67 1-4,45-52,150-158, (13)033-(21)033 96-102 185-277,304-311, (20)346-(19)347 362-365 (21)360-(18)361 1983 42 1-2,44-51,115-219, (05)034-(19)034 none 233-240,261-269, (13)079-(20)079 282-365 (21)085-(20)086 1984 0 1-366 none none 1985 100 none none none 1986 100 none (12)263-(23)263 none 1987 100 none none none 1988 98 66-67,276-284 (05)263-(22)263 none (13)314-(00)315 1989 97 19-31 none none 1990 41 151-365 (06)025-(14)025 none 1991 100 none none none 1992 99 366 none none 1993 94 1-11,296-299,306- (05)120-(21)120 none 312,331-334 (20)286-(14)287 (04)293-(19)293 (12)303-(11)304 1994 92 27-32,59-62,101-108, none none 251-266 1995 100 none none none 1996 48 176-366 (21)173-(06)174 none 1997 100 none (22)180-(11)181 none (22)180-(11)181 1998 99 59-60,195-196,365 none none 1999 44 1-33,49-220 none none 2000 100 none none none 2001 92 87-109,151-155,197- (12)264-(23)264 none 198,211-212 2002 97 50-55,98-105 (22)305-(21)306 none 2003 90 125-134,202-209,296- (00)323-(23)323 none 317 2004 99 33-35 (12)090-(11)091 none 2005 100 none (13)089-(11)090 none 2006 100 none none none 2007 99 190-193 (00)252-(23)252 none 2008 99 207-209 none none 2009 100 none none none 2010 100 none (19)322-(02)323 none (05)323-(19)323 (12)324-(20)324 (08)347-(18)347 (05)348-(19)348 (15)349-(03)350 (04)351-(00)352 (17)352-(02)353 2011 83 16-80 (08)341-(02)342 none 2012 99 267-268 (16)278-(03)279 none 2013 99 267-268 (12)273-(03)274 none 2014 100 none none none 2015 100 none none none 2016 100 none none none 2017 100 none none none 2018 100 none (12)273-(21)273 none 2019 99 174-175,365 none none