QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 05 Dec 2005 Station : Pohnpei-B Latitude: 06 59.2N Country : Fed. States Micronesia Longitude: 158 14.6E JASL # : 001B Time Meridian: 165E (GMT + 11 hr) GLOSS # : 115 Originator #: ID070007 NODC #: 10156802 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) 1974-7/1995, Leupold & Stevens Analog-to-Digital Recorder (ADR) 2) 11/1982-, Handar Encoder, model 436A (ENC) 3) 7/1995-, Handar Encoder, model 436B (ENB) with datalogger (ENO) Primary gauge: ADR: 1974-1990, ENC: 1991-1997, ENB: 1998- Digitzd Intvl: 15 (ADR); 4 (ENC); 15 (ENB and ENO) 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 : 21 Apr 1974 - 31 Dec 2004 Gaps > 1 mon : 22 Jan - 22 Mar 1975; 17 Apr - 15 Jun 1981 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1974-2004 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 tidal analysis was unable to resolve all the harmonic constituents in the data thus the hourly residuals contain uncertain periodic signatures. The daily and monthly means reveal no apparent changes in the reference level and agree well with Majuro. The data quality is good. This series is distinguished from Pohnpei-A because the two series are not linked to the same tide staff zero. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1974 68 262-267 none See comment above 1975 81 22-81,253-261 none " " " 1976 99 57-59 none " " " 1977 97 162-163,195-197 none " " " 298-302 1978 99 16-17,164-165 none " " " 1979 98 99-113,234-236 none " " " 1980 100 none none " " " 1981 81 19-27,107-166 none " " " 1982 98 189-192,326-327 none " " " 1983 95 154-156,215-230 none " " " 1984 100 none none " " " 1985 100 none none " " " 1986 100 none none " " " 1987 99 121 none " " " 1988 100 none (06)291-(22)291 " " " 1989 100 none none " " " 1990 100 none none " " " 1991 92 70-99 none " " " 1992 100 none none " " " 1993 100 none none " " " 1994 100 none none " " " 1995 99 241-243 none " " " 1996 100 none none " " " 1997 100 none none " " " 1998 99 123-124,214-215 none " " " 1999 100 none none " " " 2000 100 none (10)209-(22)209 " " " 2001 99 33-35 none " " " 2002 100 none none " " " 2003 100 none none " " " 2004 100 none none " " "