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 : Yap-B Latitude: 09 30.5N Country : Fed. States Micronesia Longitude: 138 07.7E JASL # : 008B Time Meridian: 150E (GMT + 10 hr) GLOSS # : 119 TOGA #: P017 NODC #: 10139801 Contributor : University of Hawaii Sea Level Center (1973-) 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 Scripps Institute of Oceanography (1969-70) University of California at San Diego La Jolla, California Originator : Dept. of Oceanography (1973-) University of Hawaii 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 unconfirmed (1969-70) Original Data: unconfirmed (1969-70), analog (1973-8/74), digital (9/1974-) Instrmnt Type: 1) unconfirmed (1969-70) 2) Bristol bubbler (1973-8/1974) 3) Fischer and Porter Analog-to-Digital Recorder (ADR), (9/1974-4/1991) 4) Handar Encoder (ENC) model 436A, (5/1991-) 5) Handar Encoder (ENB) model 436B, (5/1991-), replaced ADR, also uses data logger (ENO) Primary gauge: ADR:1974-4/1991, ENC 5/1991-1997, ENB:1998; ENC: 1999- Digitzd Intvl: unconfirmed (1969-70), hourly(1973-8/74); 15 min (ADR), 4 min (ENC), 15 min (ENB&ENO) Present Data : Hourly, daily, and monthly values obtained by: Hourly : unconfirmed (1969-70);spot hour (1973-8/74 only); (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 : 10 May 1969 - 31 Dec 2000 Gaps > 1 mon : 31 Dec 1970 - 31 Mar 1973;05 Apr 1989 - 15 May 1989 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : Yes Distribution : 1969-2000 Refernce Levl: Yap-B is separate from Yap-A (1951-52) because the two series have not been linked to a common datum. All heights have been referred to the station tide staff zero which is linked to fixed bench marks. Geodetic levelling has confirmed that the tide station was sinking during 1969-1990. Month by month corrections were applied so that the data are all relative to 14.052 ft (BM 7,1990). There is good agreement between the detrended series and the nearest site at Malakal. Additional information is available from the University of Hawaii Sea Level Center. Comment : Prior to 1982, the timing was less accurate than plus or minus 7.5 minutes. The daily and monthly means reveal no apparent changes in the reference level and agree well with a nearby station,Malakal. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1969 64 none none none 1970 99 365 none none 1971 0 1-365 none none 1972 0 1-366 none none 1973 75 1-90 none none 1974 100 none none none 1975 98 18-20,114-117 128(13)-129(0) 235-238,250-251 232(09)-233(07) 1976 100 none none none 1977 100 none none none 1978 100 none none 198-199,234-238, 287-289 1979 100 none none 307 1980 100 none none none 1981 100 none none none 1982 100 none none 77,114 1983 100 none none 27-30,169-170,229- 230,249,268-269, 272-273,279-280, 346-347 1984 97 51-54,86-92 244(02-13) 12-13,47-48,59-60, 79,131,147-148,153- 155,192-193,209-216, 221-225,237-248,260- 261,270-274,287-291, 300,326 1985 97 53-55,57-64 none 17,39,44-45,51,86, 97-98,102,124,153, 199,256-260,289-292, 304,330,332,338 1986 100 none none 224,231 1987 100 none none 44,252,268-272,282- 285,296-299,327-328 1988 99 85-86 none 269-272,300-302,309 1989 89 95-135 none 319-320,332 1990 99 174-178 none 291,337 1991 99 230-233 none none 1992 99 158-160,341-344 (11)017-(22)017 none (00)038-(23)038 (01)168-(20)168 (00)175-(23)175 1993 100 none none none 1994 99 153-154,197-199 (05)327-(19)327 none 1995 100 none none none 1996 99 363-365 none none 1997 100 none (16)086-(13)087 none 1998 100 none (22)137-(14)138 none 1999 100 none none none 2000 100 none (18)334-(14)335 none