QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 01 Nov 2010 Station : Chatham Latitude: 43 56.8S Country : New Zealand Longitude: 176 33.7W JASL # : 079A Time Meridian: 180E (GMT + 12 hr) GLOSS # : 128 TOGA #: none NODC #: 54173601 Contributor : University of Hawaii Sea Level Center University of Hawaii at Manoa Honolulu, Hawaii 96822 Originator : University of Hawaii Sea Level Center Pacific Tsunami Warning Center in collaboration with the Royal New Zealand Navy - Hydrographic Office Burns Avenue Takapuna, Auckland, New Zealand Original Data: digital Instrmnt Type: 1) 11/1989 - 5/1997 bubbler (BUB) pressure gauge (model unconfirmed) 2) Handar Encoder, model 436B (ENB) 3) Druck pressure transducer (PRS), primary sensor for most of the series 2001- Digitzd Intvl: 2 minutes Present Data : Hourly, daily, and monthly values obtained by: Hourly : three-point Hanning filter centered on the hour 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 : 01 Jan 1992 - 30 Sep 2010 Gaps > 1 mon : 30 Jul 1992 - 29 Oct 1992;30 Dec 1992 - 13 Apr 1993 01 Dec 1993 - 09 Feb 1994;31 Aug 1994 - 31 Dec 2000 23 Jun 2003 - 27 Apr 2004;30 Dec 2004 - 25 Feb 2005 26 Jan 2006 - 10 Jan 2007 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 2001-2010 Refernce Levl: Heights are referred to the station tide staff zero, which is linked to land-based benchmarks. This reference zero is unique to this station and is not an official datum (chart, national, etc.) and is not relative to local tidal parameters, such as mean lower low water. See the Originators for benchmark descriptions, maps, and the geodetic levelling history. Tide Gauge Benchmark (TGBM): upper of 3 brass pegs set in the sea wall near the root of the Waitangi wharf. Tide Gauge Zero (TGZ) = 4.65m below TGBM. Comment : Data prior to 2001 have not received finalized reference level calibration. The fluctuations in the residuals of 28 Feb - 01 Mar 2010 is weather related. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1992 74 188-191,212-303,315- none 188 316,366 1993 58 1-103,294-315,335- none none 365 1994 55 1-40,52-53,58-62 none none 1995 0 1-365 none none 1996 0 1-366 none none 1997 0 1-365 none none 1998 0 1-365 none none 1999 0 1-365 none none 2000 0 1-366 none none 2001 100 none none none 2002 99 171-173 none none 2003 47 107-108 (04)140-(19)140 none (04)142-(19)142 (05)144-(19)144 (04)169-(19)169 2004 68 1-118,365-366 none none 2005 85 1-56 none none 2006 7 26-365 none none 2007 98 1-10 none none 2008 100 none none none 2009 100 none none none 2010 75 none none none