San Juan (Puerto Rico) Site History

History Summary

Station San Juan, Puerto Rico
Latitude 18° 28.0' N
Longitude 066° 07.0' W
Country USA
GLOSS No 206
Time Reference GMT (00-23 hours)
Contributor (1985-1990) TOGA Sea Level Center
(1991-2000) NOAA/NOS, USA
Instrument Type (1985-1990) Float and stilling well gauge, Analog- to-Digital Recorder
(1991-2000) Next Generation Water Level Measurement System, acoustic sensor
Site of Gauge  
Observational Periods 1962-1974, 1978-2000 (data available for 1985-2000)

Tide Gauge Benchmark (TGBM) Description

NOS tidal benchmark survey disk stamped '5371 A 1977' set in the top of a concrete sea wall at the U.S. Coastguard compound.

Auxiliary Benchmarks

Benchmark Year
5371 B 1977
5371 C 1977
5371 D 1977
5371 E 1977
5371 F 1977
5371 G 1977
NO 13 1962
NO 14 1962
  1968

Benchmark Relationships

All heights have been referred to the station Tide Gauge Zero which is linked to fixed bench marks.

Benchmark Description
TGBM 5.32 feet above mean lower low water (1960-1978 epoch)
TGBM 4.54 feet above mean sea level (1960-1978 epoch)
TGBM 3.99 feet above mean high water (1960-1978 epoch)

Quality Assessment

Comments

The daily and monthly values do not show any obvious shifts or trends and agree well with Magueyes Island in SW Puerto Rico.

The monthly plot reveals a consistent annual signal.

The sharp peak on 18 September 1989 is due to Hurricane Hugo.

The data for 1994-2000 were supplied with heights relative to MLLW. Consequently 975mm 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 (%) QI (%) Missing Data Replaced Gaps
or Bad Data
Questionable
Fluctuations
1985 99 99 None None None
1986 100 100 None None None
1987 97 97 124-135 None None
1988 52 52 152-249,286-366 None None
1989 78 78 1-65,240-256 None 66-70
1990 100 100 None None None
1991 99 91 35-40 None None
1992 100 100 None None None
1993 100 100 None None None
1994 100 100 None None None
1995 100 100 None None None
1996 100 100 None None None
1997 100 100 None None None
1998 100 99 None None 264-265
1999 92 92 153,154,156-170 213-228 (13)156 44,104-107,213
2000 100 100 None None 130-135,180-190,240-245