Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.9415c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Aug. 10, 1987, p. 9415-9422.
Physics
49
Earth Gravitation, Earth Rotation, Geodesy, Gravitational Fields, Snow, Annual Variations, Nimbus 7 Satellite, Polar Wandering (Geology), Remote Sensing
Scientific paper
A global, monthly snow depth data set has been generated from the Nimbus 7 satellite observations using passive microwave remote-sensing techniques. Seven years of data, 1979-1985, are analyzed to compute the snow load effects on the earth's rotation and low-degree zonal gravitational field. The resultant time series show dominant seasonal cycles. The annual peak-to-peak variation in J2 is found to be 2.3 x 10 to the -10th, that in J3 to be 1.1 x 10 to the -10th, and believed to decrease rapidly for higher degrees. The corresponding change in the length of day is 41 micro-s. The annual wobble excitation is (4.9 marc sec, -109 deg) for the prograde motion component and (4.8 marc sec, -28 deg) for the retrograde motion component. The excitation power of the Chandler wobble due to the snow load is estimated to be about 25 dB less than the power needed to maintain the observed Chandler wobble.
Chang Alfred T. C.
Fong Chao Benjamin
Foster James L.
Hall Dorothy K.
O'Connor William P.
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