Adak (USA) Site History
History Summary
| Station name | Adak |
|---|---|
| Latitude | 51° 51.5' N |
| Longitude | 176° 38.1' W |
| Country | U.S.A. |
| GLOSS No. | 302 |
| Time Reference | GMT (00-23 hours) |
| Contributor | (1955-2000) NOAA/NOS, USA |
| Instrument type | (1985-1990) Analog-to-Digital Recorder (ADR)
(1991-2000) Next Generation Water Level Measurement System - acoustic sensor |
| Site of Gauge | Tide gauge is located on pier in Sweeper Cove. |
| Observational Period | 1943 - 2000 |
| Reference Level | All data are referred to Tide Gauge Zero and are linked into historic fixed benchmarks. |
Tide Gauge Benchmark (TGBM) Description
BM Control - US C and GS benchmark survey disk stamped 'No 18 1957' set in a concrete pad near a fire hydrant on sea wall road in Sweeper Cove.
Auxiliary Benchmarks
| NO | 20 | 1957 |
| BM | 23 | 1968 |
| BM | 24 | 1968 |
| J7 | 1945 | |
| 1380 | C | 1981 |
| 1380 | D | 1982 |
| NO | 14 | 1951 |
| 1380 | F | 1983 |
| 1380 | G | 1983 |
| No stamping 1 |
Benchmark Relationships
TGBM = 18.97 feet above mean lower low water (1960-1978 epoch)
TGBM = 16.75 feet above mean sea level (1960-1978 epoch)
TGBM = 15.14 feet above mean higher high water (1960-1978 epoch)
Quality Assessment
Comments
The daily or monthly means do not reveal any obvious reference level shifts.
The data for 1955-1983 have been shifted forward by one hour to correct a timing error.
The data for 1996-2000 were supplied with heights relative to MLLW. Consequently 890mm was added to refer the data to tide gauge zero.
The data for 1998-2000 were supplied in non-GMT format and had to be shifted into GMT.
| Year | Completeness
Index (%) |
Questionable Fluctuations(in day Nos.)
and Missing Data (Gaps >6 hours) |
|---|---|---|
| 1950 | 78 | None
Gap from 1950/01/01 at 00.00 to 1950/03/17 at 00.00 Gap from 1950/03/26 at 02.00 to 1950/04/01 at 10.00 |
| 1951 | 68 | None
Gap from 1951/04/01 at 00.00 to 1951/07/28 at 03.00 |
| 1952 | 100 | None |
| 1953 | 100 | None |
| 1954 | 98 | 170-171
Gap from 1954/05/02 at 03.00 to 1954/05/11 at 03.00 |
| 1955 | 100 | None |
| 1956 | 98 | None |
| 1957 | 53 | None |
| 1958 | 100 | None |
| 1959 | 100 | None |
| 1960 | 91 | None
Gap from 1960/09/17 at 11.00 to 1960/10/01 at 10.00 Gap from 1960/12/04 at 13.00 to 1960/12/06 at 02.00 Gap from 1960/12/12 at 18.00 to 1960/12/13 at 01.00 |
| 1961 | 48 | None
Gap from 1961/03/01 at 02.00 to 1961/03/17 at 01.00 Gap from 1961/03/27 at 11.00 to 1961/04/24 at 22.00 Gap from 1961/04/29 at 11.00 to 1961/05/01 at 05.00 Gap from 1961/08/12 at 11.00 to 1961/08/14 at 21.00 Gap from 1961/08/16 at 08.00 to 1961/08/18 at 06.00 Gap from 1961/09/05 at 13.00 to 1961/09/09 at 22.00 Gap from 1961/09/14 at 17.00 to 1961/09/15 at 04.00 Gap from 1961/09/19 at 17.00 to 1961/09/20 at 20.00 |
| 1962 | 78 | 184-188
Gap from 1962/02/20 at 16.00 to 1962/02/21 at 05.00 Gap from 1962/02/21 at 21.00 to 1962/02/27 at 00.00 Gap from 1962/03/01 at 21.00 to 1962/04/01 at 10.00 |
| 1963 | 84 | None |
| 1964 | 33 | None
Gap from 1964/07/07 at 22.00 to 1964/07/08 at 18.00 Gap from 1964/07/24 at 02.00 to 1964/07/24 at 17.00 Gap from 1964/07/25 at 03.00 to 1964/07/29 at 18.00 Gap from 1964/09/03 at 21.00 to 1964/10/07 at 01.00 Gap from 1964/10/30 at 14.00 to 1964/12/29 at 23.00 |
| 1965 | 89 | None
Gap from 1965/01/12 at 16.00 to 1965/01/18 at 23.00 Gap from 1965/02/03 at 12.00 to 1965/02/04 at 04.00 Gap from 1965/02/15 at 14.00 to 1965/03/06 at 08.00 Gap from 1965/03/08 at 00.00 to 1965/03/17 at 04.00 Gap from 1965/03/21 at 10.00 to 1965/03/23 at 02.00 |
| 1966 | 100 | None |
| 1967 | 100 | None |
| 1968 | 100 | None |
| 1969 | 100 | None |
| 1970 | 98 | None
Gap from 1970/06/01 at 20.00 to 1970/06/02 at 12.00 Gap from 1970/06/02 at 18.00 to 1970/06/03 at 02.00 Gap from 1970/06/13 at 22.00 to 1970/06/14 at 11.00 Gap from 1970/06/28 at 21.00 to 1970/06/29 at 10.00 Gap from 1970/09/18 at 20.00 to 1970/09/23 at 08.00 Gap from 1970/09/28 at 00.00 to 1970/09/28 at 18.00 |
| 1971 | 100 | None |
| 1972 | 99 | None
Gap from 1972/07/12 at 03.00 to 1972/07/16 at 03.00 |
| 1973 | 100 | 183-184 |
| 1974 | 100 | 188-199 |
| 1975 | 100 | 306,308 |
| 1976 | 80 | 182
Gap from 1976/03/10 at 09.00 to 1976/03/10 at 18.00 Gap from 1976/04/13 at 11.00 to 1976/04/28 at 10.00 Gap from 1976/05/09 at 11.00 to 1976/05/11 at 10.00 Gap from 1976/06/17 at 11.00 to 1976/06/18 at 10.00 Gap from 1976/09/02 at 11.00 to 1976/09/04 at 10.00 Gap from 1976/09/10 at 03.00 to 1976/09/22 at 19.00 Gap from 1976/09/26 at 04.00 to 1976/10/07 at 01.00 |
| 1977 | 20 | None
Gap from 1977/03/02 at 23.00 to 1977/03/03 at 22.00 Gap from 1977/03/28 at 08.00 to 1977/03/28 at 22.00 |
| 1978 | 8 | None |
| 1979 | 100 | None |
| 1980 | 100 | None |
| 1981 | 100 | None |
| 1982 | 100 | None |
| 1983 | 100 | None |
| 1984 | 100 | None |
| 1985 | 100 | None |
| 1986 | 92 | None
Gap from 1986/04/02 at 05.00 to 1986/05/03 at 04.00 |
| 1987 | 96 | None
Gap from 1987/01/18 at 16.00 to 1987/02/02 at 00.00 |
| 1988 | 100 | None |
| 1989 | 100 | None |
| 1990 | 100 | None |
| 1991 | 100 | None |
| 1992 | 100 | None |
| 1993 | 100 | None |
| 1994 | 100 | None |
| 1995 | 100 | None |
| 1996 | 100 | None |
| 1997 | 100 | None |
| 1998 | 100 | 238 |
| 1999 | 100 | 80-81,309-310,331 |
| 2000 | 100 | None |
