GLOSS Station Handbook

Station information sheet

General                                  
GLOSS number149
Station name

Apra Hbr, Guam, Marianas

CountryU.S.A.
Time zone150E, GMT + 10hrs
Latitude (+ve N)13.43333
Longitude (+ve E)144.65
OceanPacific
Observation period(s)1948-
Responsible countryU.S.A.
Authority responsible
for tide gauge
NOAA, National Ocean Service, 1305 East-West Highway, Silver Spring, MD 20910-3281, USA
GLOSS contactUSA
Committed to GLOSSYes
OperationalYes
Location mapView location map for GLOSS station Apra Hbr, Guam, Marianas
Instrumentation 
FloatYes
PressureNo
BubblerYes
AcousticYes
RadarNo
Data
Digital dataYes
Additional parametersAir temperature, barometric pressure, wind sensors
Data acquisition rateDigital gauge: 6 minute interval (after 1976) Analog gauge: hourly heights (before 1976)
Fast delivery data at UHSLCDownload h053.dat from UHSLC   Format documentation for UHSLC data
High frequency data at BODCDownload g149.zip from BODC   View Apra Hbr, Guam, Marianas site history  
High frequency data at UHSLCDownload h053a.zip from UHSLC   Download documentation qa053a.dmt from UHSLC   Format documentation for UHSLC data
Data held at national organisationYes
Real-time data availableYes
Real-time data transmitted
to GLOSS Fast Centre
Real-time data plots from UHSLC
Additional parameters (real-time)Air temperature, barometric pressure, wind sensors
Benchmarks 
Tide gauge benchmarksBenchmark 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.
Benchmark relationshipsTGBM is 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
Auxiliary benchmarks9 additional benchmarks are levelled to the TGBM and the Tide Station on a yearly basis. BM's L, 5, and USN BM1 subsided during earthquake - October 1993 site inspection was primarily for levelling due to recent earthquake. Other benchmarks include: BM 11, BM 4, BM 12, BM 13, BM 7 (P.I.E.), BM K, BM 6, BM 13
Data at PSMSL 
Annual MSL (RLR) dataDownload annual MSL (RLR) data for Apra Hbr, Guam, Marianas
Annual MSL (RLR) plotView annual MSL (RLR) plot for Apra Hbr, Guam, Marianas
PSMSL code540
Other relevant codesUHSLC 053
Additional information 
Last updated1993-12-05

Related BODC pages

Sea level portal      World Ocean Circulation Experiment (WOCE) — Sea  level
UK Tide Gauge Network     Climate Variability and Predictability (CLIVAR)
GLOSS project page  

 

Related external links

Global Sea Level Observing System (GLOSS)     Permanent Service for Mean Sea Level (PSMSL)
University of Hawai`i Sea Level Centre (UHSLC)  World Ocean Circulation Experiment (WOCE)

 

Permanent Service for Mean Sea Level (PSMSL) Global Sea Level Observing System (GLOSS) Station Handbook Intergovernmental Oceanographic Commission (IOC)