QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 13 Dec 2001 Station : Kanton-B Latitude: 02 48.6S Country : Republic of Kiribati Longitude: 171 43.1W JASL # : 013B Time Meridian: 165W (GMT -11 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-present) Handar Encoder 436A (ENC) 5. (3/1990-present) Handar Encoder 436B (ENB) with datalogger (ENO) Primary gauge: ADR: 1975-90, ENC: 1991- Digitzd Intvl: 15 (ADR,ENB,ENO); 3 or 4 (ENC) minutes 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 2000 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 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1972-2000 Refernce Levl: All heights have been referred to the station tide staff zero which is linked to fixed bench marks Comment : The daily and monthly means reveal no apparent changes in the reference level and agree well with Christmas Island. 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