GLOSS Station Handbook

Station information sheet

GLOSS number102
Station name

Unalaska, Aleutian Is. AK

Time zone135W, GMT - 9hrs
Latitude (+ve N)53.88333
Longitude (+ve E)-166.53333
Observation period(s)1955-1977, 1982-, being upgraded 2007
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
Location mapView location map for GLOSS station Unalaska, Aleutian Is. AK
Digital dataYes
Data acquisition rate6 minute interval
Fast delivery data at UHSLCDownload h041.dat from UHSLC   Format documentation for UHSLC data
High frequency data at UHSLCDownload from UHSLC   Download documentation qa041a.dmt from UHSLC   Download from UHSLC   Download documentation qa041b.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
Tide gauge benchmarksUS C&GS benchmark survey disk stamped 'NO 7 1956' set in a concrete footing of an old antenna near the Alaska Communication System Building.
Benchmark relationshipsTGBM = 8.78 feet above mean lower low water (1960-1978 epoch) TGBM = 6.59 feet above mean sea level (1960-1978epoch) TGBM = 5.05 feet above mean higher high water (1960-1978 epoch)
Auxiliary benchmarksNO 18 1973 2620 L 1982 NO 19 1973 2620 M 1982 NO 20 1974 TIDAL BM 21 1975 Site inspection 1993 states 2620 J 1979 'levels agree with history' 2620 K 1982
Data at PSMSL 
Annual MSL (RLR) dataDownload annual MSL (RLR) data for Unalaska, Aleutian Is. AK
Annual MSL (RLR) plotView annual MSL (RLR) plot for Unalaska, Aleutian Is. AK
PSMSL code757
Other relevant codesUHSLC 041
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)