QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 09 Apr 2019 Station : Kanton-B Latitude: 02 48.6S Country : Republic of Kiribati Longitude: 171 43.1W JASL # : 013B Time Meridian: PHOT (GMT + 13 hr) GLOSS # : 145 TOGA #: P052 NODC #: 50172101 Contributor : UH Sea Level Center 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 Originator : Dept. of Oceanography University of Hawaii 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 Original Data: digital Instrmnt Type: 1. float/well (unconfirmed model) 5/1972-2/1975 2. (2/1975 - 2/1986 )Fischer and Porter Analog-to-Digital Recorder (ADR) 3. (2/1986-3/1992) Leupold and Stevens Analog-to-Digital Recorder (ADR); 4. (2/1982-10/2010) Handar Encoder 436A (ENC) 5. (3/1990-present) Handar Encoder 436B (ENB) with datalogger (ENO) 6. Radar (RAD), Vega Vegapuls 62, 3/2007- 7. Pressure transducer (PRS) 3/2010- Primary channel used in JASL set: 1972-2/1975: unconfirmed (float/well) 2/1975-3/1990: ADR 3/1990-10/16/2010: ENC 10/17/2010-2018: RAD *short gaps in primary channel filled with other channels as available; see UHSLC for specific dates Digitzd Intvl: 15 (ADR,ENB,ENO); 3 or 4 (ENC) minutes; 2 min (RAD and PRS) Present Data : Hourly, daily, and monthly values obtained by: Hourly : (pre-1987) Nine-point triangular filter centered on the hour with respective periods of the 95, 50, and 5% amplitude point of the filter response at 623.6, 177.0, and 103.7 minutes;(1987+) 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 May 1972 - 31 Dec 2018 Gaps > 1 mon : 20 Aug 1980 - 20 Mar 1981;2 Jul 1981 - 14 Jan 1982; 2 May - 1 Jun, 2 Jul - 14 Sep 1982; 29 Apr - 2 Jun, 1 Aug - 2 Sep 1983; 14 Jan - 3 Mar 1985; 03 Aug 2001 - 08 Mar 2004;15 Mar 2010 - 14 Apr 2010 15 Apr 2012 - 22 Jul 2015 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1972-2018 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. Comment : The daily and monthly means reveal no apparent changes in the reference level and agree well with Christmas Island. The JASL update of 09 Apr 2019 replaces 01 Jan 2016 - 05 Oct 2017. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1972 66 none none none 1973 97 121-132 none 294-295,327-329 1974 100 none none 275-277 1975 99 137-142 none none 1976 100 none none none 1977 99 316-318 none none 1978 98 111-114,166-169 none none 1979 96 95-96,227-284, none 61-63,249-251, 299-304 276-277 1980 62 17-23,232-366 none none 1981 29 1-79,183-365 none none 1982 67 1-14,122-152, none none 183-257 1983 78 48-59,119-153, none none 213-245 1984 100 none none 49,104-105 1985 87 14-62 none none 1986 100 none none none 1987 100 none none none 1988 100 none none none 1989 100 none none none 1990 100 none none none 1991 100 none none none 1992 99 236-238 none none 1993 100 none none none 1994 99 74-76 (00)065-(12)065 none 1995 100 none none none 1996 100 none none none 1997 100 none none none 1998 100 none (00)049-(22)049 none 1999 100 none none none 2000 100 none none none 2001 59 none none none 2002 0 1-365 none none 2003 0 1-365 none none 2004 82 1-68 none none 2005 100 none none none 2006 100 none none none 2007 93 65-90 none none 2008 100 none none none 2009 100 none none none 2010 87 41-59,74-104 (13)332-(22)332 none 2011 100 none (11)181-(18)181 none (15)239-(01)240 (10)240-(17)240 2012 28 81-83,106-366 none none 2013 0 1-365 none none 2014 0 1-365 none none 2015 44 1-203 none none 2016 100 none none none 2017 100 none none none 2018 100 none (21)233-(13)234 none