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Variability in the Gulf of Alaska from Geosat altimetry dataSatellite altimetry was used to examine annual and interannual variability in the Gulf of Alaska region. Crossover data from the Geosat Geodetic Mission (GM) and collinear data from the Exact Repeat Mission (ERM) were processed separately to form sea surface height anomalies at grid points. The time series from the GM and ERM were then combined to produce a 3.75-year data set. The time series from the ERM data set agreed fairly well with hydrographic dynamic heights at several locations, with an average correlation of 0.70 between the two data sets. The combined and ERM altimetric data sets were analyzed using empirical orthogonal functions (EOFs). These revealed variability that occurs primarily on annual and interannual time scales. A comparison with EOF analysis of the atmospheric pressure field during the same time periods showed that the annual variation in pressure seemed to be reflected in both the combined and ERM altimetric data sets. The amplitude time series of the first mode in the combined data set was very similar to the North Pacific pressure index during the 1985-1989 time frame. The maximum correlation was at a lag of 250 days. Finally, an interannual mode was present in all three data sets which was closely linked to the baroclinic variations measured by the hydrographic data.
Document ID
19940033972
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bhaskaran, Shyam
(Colorado Univ. Boulder; JPL, Pasadena, CA, United States)
Lagerloef, Gary S. E.
(Science Applications International Corp. Bellevue, WA, United States)
Born, George H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Emery, W. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Leben, Robert R.
(Colorado Univ. Boulder, United States)
Date Acquired
August 16, 2013
Publication Date
September 15, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: C9
ISSN: 0148-0227
Subject Category
Oceanography
Accession Number
94A10627
Funding Number(s)
CONTRACT_GRANT: JPL-958119
Distribution Limits
Public
Copyright
Other

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