Abstract
The launch of the Gravity Recovery and Climate Experiment (GRACE) satellite mission in March 2002 has made timely the study of geophysical processes that redistribute the Earth’s mass. This study uses the Hadley Centre coupled ocean- atmosphere model HadCM3 to examine the ocean’s role in mass redistribution on inter-annual to decadal timescales. The leading empirical mode of inter-annual bottom pressure variability is a striking, basin-wide, oscillation between the Atlantic and Pacific Oceans. Our analysis suggests that this mode is primarily a wind driven phenomenon. We find some evidence for such a mode in a re-analysis of the global ocean, although the indirect nature of this evidence means no certain conclusions can yet be drawn. Thus, we consider the gravitational effects of this mode and the potential of current geodetic missions to detect it. A surprising result is that oceanic mass redistribution can lead to decadal trends in the zonal harmonic J 2, with a slope of approximately one-third that observed in geodetic measurements of J 2, all of which is normally attributed to post glacial rebound.
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Bingham, R., Haines, K. (2005). Decadal Ocean Bottom Pressure Variability and its Associated Gravitational Effects in a Coupled Ocean- Atmosphere Model. In: Jekeli, C., Bastos, L., Fernandes, J. (eds) Gravity, Geoid and Space Missions. International Association of Geodesy Symposia, vol 129. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-26932-0_52
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DOI: https://doi.org/10.1007/3-540-26932-0_52
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