Snow Load Effect on the Earth's Rotation and Gravitational Field, 1979-1985
A global, monthly snow depth data set has been generated from the Nimbus 7 satellite observations using passive microwave remote-sensing techniques. In this paper we analyze 7 years of data, 1979-1985, to compute the snow load effects on the earth's rotation and low-degree zonal gravitational f...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.612.9604 2023-05-15T13:32:04+02:00 Snow Load Effect on the Earth's Rotation and Gravitational Field, 1979-1985 B. Fong Chao William P. O'connor Alfred T. C. Chang Dorothy K. Hall James L. Foster The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.612.9604 http://www.ncu.edu.tw/~ncu5680/deans/class/eng/1987-Chao et al_JGR1987_snow load effect on earth rotation and gravitational field 1979-1985.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.612.9604 http://www.ncu.edu.tw/~ncu5680/deans/class/eng/1987-Chao et al_JGR1987_snow load effect on earth rotation and gravitational field 1979-1985.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.ncu.edu.tw/~ncu5680/deans/class/eng/1987-Chao et al_JGR1987_snow load effect on earth rotation and gravitational field 1979-1985.pdf text ftciteseerx 2016-01-08T14:36:09Z A global, monthly snow depth data set has been generated from the Nimbus 7 satellite observations using passive microwave remote-sensing techniques. In this paper we analyze 7 years of data, 1979-1985, to compute the snow load effects on the earth's rotation and low-degree zonal gravitational field. A uniform sea level decrease has been assumed in order to conserve water mass. The resultant time series show dominant seasonal cycles. The annual peak-to-peak variation in J2 is found to be 2.3 x 10-•o, that in J3 to be 1.1 x 10-•o, and believed to decrease rapidly for higher degrees. The corresponding change in the length of day is 41 Us. The annual wobble excitation is (4.9 marc sec,-109 ø) for the prograde motion component and (4.8 marc sec,-28 ø) 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. The superior quality of the satellite data over conventional data acquired by ground observations and modeling is demonstrated. We also discuss the role of atmospheric water and the problems arising from the lack of snow load observations over the Antarctic and Green-land ice sheets. 1. Text Antarc* Antarctic Unknown Antarctic Chandler ENVELOPE(-59.682,-59.682,-64.490,-64.490) The Antarctic |
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ftciteseerx |
language |
English |
description |
A global, monthly snow depth data set has been generated from the Nimbus 7 satellite observations using passive microwave remote-sensing techniques. In this paper we analyze 7 years of data, 1979-1985, to compute the snow load effects on the earth's rotation and low-degree zonal gravitational field. A uniform sea level decrease has been assumed in order to conserve water mass. The resultant time series show dominant seasonal cycles. The annual peak-to-peak variation in J2 is found to be 2.3 x 10-•o, that in J3 to be 1.1 x 10-•o, and believed to decrease rapidly for higher degrees. The corresponding change in the length of day is 41 Us. The annual wobble excitation is (4.9 marc sec,-109 ø) for the prograde motion component and (4.8 marc sec,-28 ø) 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. The superior quality of the satellite data over conventional data acquired by ground observations and modeling is demonstrated. We also discuss the role of atmospheric water and the problems arising from the lack of snow load observations over the Antarctic and Green-land ice sheets. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
B. Fong Chao William P. O'connor Alfred T. C. Chang Dorothy K. Hall James L. Foster |
spellingShingle |
B. Fong Chao William P. O'connor Alfred T. C. Chang Dorothy K. Hall James L. Foster Snow Load Effect on the Earth's Rotation and Gravitational Field, 1979-1985 |
author_facet |
B. Fong Chao William P. O'connor Alfred T. C. Chang Dorothy K. Hall James L. Foster |
author_sort |
B. Fong |
title |
Snow Load Effect on the Earth's Rotation and Gravitational Field, 1979-1985 |
title_short |
Snow Load Effect on the Earth's Rotation and Gravitational Field, 1979-1985 |
title_full |
Snow Load Effect on the Earth's Rotation and Gravitational Field, 1979-1985 |
title_fullStr |
Snow Load Effect on the Earth's Rotation and Gravitational Field, 1979-1985 |
title_full_unstemmed |
Snow Load Effect on the Earth's Rotation and Gravitational Field, 1979-1985 |
title_sort |
snow load effect on the earth's rotation and gravitational field, 1979-1985 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.612.9604 http://www.ncu.edu.tw/~ncu5680/deans/class/eng/1987-Chao et al_JGR1987_snow load effect on earth rotation and gravitational field 1979-1985.pdf |
long_lat |
ENVELOPE(-59.682,-59.682,-64.490,-64.490) |
geographic |
Antarctic Chandler The Antarctic |
geographic_facet |
Antarctic Chandler The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
http://www.ncu.edu.tw/~ncu5680/deans/class/eng/1987-Chao et al_JGR1987_snow load effect on earth rotation and gravitational field 1979-1985.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.612.9604 http://www.ncu.edu.tw/~ncu5680/deans/class/eng/1987-Chao et al_JGR1987_snow load effect on earth rotation and gravitational field 1979-1985.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766023902370201600 |