Yap-B (Micronesia) Site History
History Summary
| Station name | Yap-B |
|---|---|
| Country | Fed. States Micronesia |
| Latitude | 09° 30.5' N |
| Longitude | 138 °07.7' E |
| GLOSS No. | 119 |
| Time Reference | GMT (hours 00-23) |
| Contributor | University of Hawaii Sea Level Center (1973-) Scripps Institute of Oceanography (1969-70) |
| Instrument Type | Unconfirmed (1969-70); Bristol bubbler (1973-8/1974) Fischer and Porter Analog-to-Digital Recorder (ADR), (9/1974-) Handar Encoder (ENC), (5/1991-) |
| Primary gauge | ADR: 1974-4/91 ENC: 5/91- |
| Site of Gauge | |
| Observational Period | 1969 - present |
Reference Level
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.
Quality Assessment by the UH Sea Level Center
Comments
Prior to 1982, the timing was less accurate than ±7.5 minutes.
The daily and monthly means reveal no apparent changes in the reference level and agree well with a nearby station, Malakal.
| Year | CI (%) | Missing Data | Replaced Gaps or Bad Data | Questionable Fluctuations |
|---|---|---|---|---|
| 1970 | 99 | 365 | none | 53-54 |
| 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),232(09)-233(07) | 235-238,250-251 |
| 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 |
| 1985 | 97 | 53-55,57-64 | none | 17,39,44-45,51,86, 97-98,102,124,153, 199,256-260,289-292 |
| 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 | 291,313,337 |
| 1991 | 99 | 230-233 | none | none |
| 1992 | 99 | 158-160,341-344 | (11)017-(22)017,(00)038-(23)038, (01)168-(20)168, (00)175-(23)175 | none |
| 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 |
