Temporal variation of the earth's low-degree zonal gravitational field caused by atmospheric mass redistribution - 1980-1988

Details Temporal variation of the earth's low-degree zonal gravitational field caused by atmospheric mass redistribution - 1980-1988 Temporal variation of the earth's low-degree zonal gravitational field caused by atmospheric mass redistribution - 1980-1988

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.6569c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 10, 1991, p. 6569-6575.

Mathematics

Logic

12

Earth Gravitation, Gravitational Fields, Laser Range Finders, Mass Distribution, Temporal Distribution, Zonal Harmonics, Air Masses, Annual Variations, Periodic Variations, Satellite-Borne Instruments

Scientific paper

Temporal variations in the low-degree zonal harmonics of the earth's gravitational field have recently been observed by satellite laser ranging. A host of geophysical processes contribute to these variations. The present paper studies quantitatively a prime contributor, atmospheric mass redistribution, using ECMWF global surface pressure data for the period of 1980-1988. The annual and semiannual amplitudes and phases of the zonal J(l) coefficient with degree l = 2-6 with and without the oceanic inverted-barometer (IB) effect are computed to obtain the predicted effects on the orbit nodal residuals of Lageos and Starlette. These predicted values are then compared with observations. It is found that the atmospheric influence, combined with the hydrological influence agree well with the Lageos observation for the annual term. The corresponding match appears poorer for Starlette.

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