Dynamically balanced absolute sea level of the global ocean derived from near-surface velocity observations

Details Dynamically balanced absolute sea level of the global ocean derived from near-surface velocity observations Dynamically balanced absolute sea level of the global ocean derived from near-surface velocity observations

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30voce7n&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 22, pp. OCE 7-1, CiteID 2164, DOI 10.1029/2003GL018628

Statistics

Computation

61

Oceanography: Physical: General Circulation, Oceanography: Physical: Currents, Oceanography: Physical: General Or Miscellaneous, Oceanography: Physical: Instruments And Techniques

Scientific paper

The 1992-2002 time-mean absolute sea level distribution of the global ocean is computed for the first time from observations of near-surface velocity. For this computation, we use the near-surface horizontal momentum balance. The velocity observed by drifters is used to compute the Coriolis force and the force due to acceleration of water parcels. The anomaly of horizontal pressure gradient is derived from satellite altimetry and corrects the temporal bias in drifter data distribution. NCEP reanalysis winds are used to compute the force due to Ekman currents. The mean sea level gradient force, which closes the momentum balance, is integrated for mean sea level. We find that our computation agrees, within uncertainties, with the sea level computed from the geostrophic, hydrostatic momentum balance using historical mean density, except in the Antarctic Circumpolar Current. A consistent horizontally and vertically dynamically balanced, near-surface, global pressure field has now been derived from observations.

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