Guam (USA Trust) Site History
History Summary
| Station | Guam |
|---|---|
| Latitude | 13° 26.0' N |
| Longitude | 144° 39.0' E |
| Country | USA Trust |
| GLOSS No. | 149 |
| Time Reference | GMT (hours 00-23) |
| Contributor | National Ocean Service (NOS) National Ocean. and Atmos. Administration (NOAA) |
| Instrument type | Standard mechanical (1947-1974) Analog-to-digital (adr) recorder (1975-1991) Aquatrak acoustic gauge, NOAA Next Generation Water Level Measuring System (NGWLMS) (1992-2000) |
| Site of Gauge | |
| Observational Periods | 1948 - 1997, 1999 - 2000 |
| Reference Level | All heights have been referred to the station tide staff zero which is linked to fixed benchmarks. |
Tide Gauge Benchmark (TGBM) Description
Benchmark 4(1949) is the primary benchmark (PBM) stamped 'NO 4 1949' set in the northwest side of a 6ft by 12ft concrete manhole in the centre of the road.
Auxilliary Benchmarks
9 additional benchmarks are levelled to the TGBM and the Tide Station on a yearly basis
Benchmark Relationships
| Benchmark | Elevation |
|---|---|
| TGBM | 9.83ft above Tide Gauge Zero (Station Datum) |
| NOAA | Chart Datum (MLLW) is 1.24ft above Station Datum Mean Sea Level (1960-1978) is 2.65ft above Station Datum |
Quality Assessment
Comment
The daily and monthly means reveal no apparent reference level changes or trends and agree with nearby stations, Saipan, Chuuk, and Kwajalein.
The low signal in late 1972 is associated with an ENSO and is also seen in the series at Chuuk.
The data for 1997-2000 were supplied with heights relative to MLLW. Consequently 378mm was added to refer the data to tide gauge zero.
The data for 1999-2000 were supplied in non-GMT format and had to be shifted into GMT.
| Year | CI (%) | Missing Data | Replaced Gaps | Questionable or Bad Data Fluctuations |
|---|---|---|---|---|
| 307-336,338-345,350- 351,360-363 | (14)089-(03)090 | |||
| 1949 | 100 | none | none | 54-56 |
| 1950 | 100 | none | none | none |
| 1951 | 100 | none | (14)207-(13)208 | none |
| 1952 | 100 | none | (13)056-(02)057 (05)057-(12)057 (14)240-(13)241 (18)353-(05)354 | none |
| 1953 | 97 | 227-238 | (07)225-(23)225(07)226-(01)227 (01)231-(20)231 (05)238-(22)238 (06)239-(18)239 (13)245-(21)245 | none |
| 1954 | 100 | none | none | none |
| 1955 | 100 | none | none | none |
| 1956 | 100 | none | none | none |
| 1957 | 100 | none | none | none |
| 1958 | 100 | none | none | none |
| 1959 | 100 | none | none | none |
| 1960 | 100 | none | none | none |
| 1961 | 100 | none | none | none |
| 1962 | 99 | 315-316 | (15)326-(09)327 | none |
| 1963 | 100 | none | none | none |
| 1964 | 90 | 172-181,249-260, 264-267,305-321 | (11)263-(02)264 | 239-244 |
| 1965 | 90 | 7-15,90-120 | (07)003-(05)004 (02)018-(23)018 (19)206-(08)207 | none |
| 1966 | 99 | 58-59 | none | 68 |
| 1967 | 100 | none | none | none |
| 1968 | 100 | none | none | none |
| 1969 | 93 | 51-55,66-70,88-99, 110-118 | (04)050-(23)050 | none |
| 1970 | 98 | 340-342,354-359 | (14)346-(04)347 | 91-94 |
| 1971 | 96 | 13-17,46-49,284-292 | none | none |
| 1972 | 99 | 364-366 | none | none |
| 1973 | 91 | 1-7,234-239, 251-257,263-267, 277-282,286-288 | (10)036-(21)036 (00)066-(15)066 (01)283-(23)283 (05)322-(12)322 | none |
| 1974 | 91 | 142-150,193-203, 281-283,297-303, 317-322 | (14)181-(22)181 (15)328-(03)329 | 69-70 |
| 1975 | 75 | 193-201,204-207, 209-217,223-225, 247-249,253-259, 275-276,282-283, 287-289,300-301, 305-337,345-356 | (16)199-(22)199 (10)204-(23)204 (12)221-(23)221 (03)227-(01)228 (20)232-(05)233 (12)234-(00)235 (01)240-(22)240 (23)243-(21)244 (06)251-(22)251 (14)341-(23)341 | 85-86,91 |
| 1976 | 46 | 1-2,26-33, 62-67,124-309 | none | none |
| 1977 | 95 | 31-41,51-54,155-159 | (18)004-(02)005 (07)074-(15)074 | none |
| 1978 | 99 | 361-362 | none | none |
| 1979 | 98 | 42-43,93-95, 274-276 | none | none |
| 1980 | 92 | 42-45,91-92, 94-101,110-126 | none | 268-270 |
| 1981 | 100 | none | none | 8-9,163-164 |
| 1982 | 92 | 165-193 | none | 40,59 |
| 1983 | 100 | none | none | 145 |
| 1984 | 100 | none | none | none |
| 1985 | 99 | 47-49,59-60 | (06)062-(03)063 | none |
| 1986 | 76 | 68-71,91-107,231-296 | none | 337-340,362-363 |
| 1987 | 100 | none | (01)028-(08)028 | 1-2,5-6,8,15,36,83,281-286,297 |
| 1988 | 98 | 33-38 | none | 67-70 |
| 1989 | 100 | none | none | 182-185 |
| 1990 | 100 | none | none | none |
| 1991 | 99 | 365 | none | none |
| 1992 | 72 | 1-61,173-215 | (03)122-(23)122 | 241 |
| 1993 | 100 | none | (20)125-(19)126 | none |
| 1994 | 100 | none | (20)019-(23)024 (23)027-(20)028 | none |
| 1995 | 100 | none | (04)082-(09)085 | none |
| 1996 | 100 | none | none | none |
| 1997 | 100 | none | none | none |
| 1999 | 75 | 1-32, 151-212 | none | 40-48,70-75,82-88,103-117,212 |
| 2000 | 100 | none | none | 50-64,71-78,98-104, 148-158,270-276,194- 195 |
