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GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L21607, doi:10.1029/2007GL031540, 2007

Ocean tidal solutions in Antarctica from GRACE inter-satellite tracking data

Shin-Chan Han

Planetary Geodynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Goddard Earth Science and Technology Center, University of Maryland Baltimore County, Baltimore, Maryland, USA


Richard D. Ray

Planetary Geodynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA


Scott B. Luthcke

Planetary Geodynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA


Abstract

Long-wavelength components of the oceanic tides surrounding Antarctica are estimated directly from three years of GRACE satellite-to-satellite ranging measurements. An inversion is performed for the major constituents M2, O1, and S2, with K1 excluded because of inadequate phase sampling. The tides are parameterized as localized average mass anomalies over areas approximately 3002 km2; other parameters, including satellite state adjustments, are estimated simultaneously with the tides. Qualitative comparison of our solutions with in situ tide measurements shows agreement in spatial pattern, clearly indicating regions where our adopted prior model is inadequate. To exploit these solutions, follow-on work must assimilate these long-wavelength components into a high-resolution numerical tidal model.

Received 31 July 2007; accepted 4 October 2007; published 10 November 2007.

Keywords: ocean tide; GRACE; Antarctica.

Index Terms: 1241 Geodesy and Gravity: Satellite geodesy: technical issues (6994, 7969); 1240 Geodesy and Gravity: Satellite geodesy: results (6929, 7215, 7230, 7240); 1214 Geodesy and Gravity: Geopotential theory and determination (0903); 1217 Geodesy and Gravity: Time variable gravity (7223, 7230); 1223 Geodesy and Gravity: Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions (0762, 1218, 3319, 4550).

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Citation: Han, S.-C., R. D. Ray, and S. B. Luthcke (2007), Ocean tidal solutions in Antarctica from GRACE inter-satellite tracking data, Geophys. Res. Lett., 34, L21607, doi:10.1029/2007GL031540.