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