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 |
