GPS Radio Occultation and the Role of Atmospheric Pressure on Spaceborne Gravity Estimation Over Antarctica
This report was prepared by Shengjie Ge, a graduate research associate in the Geodetic Science and surveying program of the Department of Geological Science at the Ohio State University, under the supervision of Professor C. K. Shum. This study was partially supported by grants from NASA Interdiscip...
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ftohiostateu:oai:kb.osu.edu:1811/78642 2024-06-02T07:57:27+00:00 GPS Radio Occultation and the Role of Atmospheric Pressure on Spaceborne Gravity Estimation Over Antarctica Ge, Shengjie, 1973- 2006-07 application/pdf http://hdl.handle.net/1811/78642 en_US eng Ohio State University. Division of Geodetic Science Ohio State University. Geodetic Science and Surveying. Report. no. 479 http://hdl.handle.net/1811/78642 This item may be protected by copyright, and is made available here for research and educational purposes. The user is responsible for making a final determination of copyright status. If copyright protection applies, permission must be obtained from the copyright holder to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to the law. Technical Report 2006 ftohiostateu 2024-05-06T11:02:08Z This report was prepared by Shengjie Ge, a graduate research associate in the Geodetic Science and surveying program of the Department of Geological Science at the Ohio State University, under the supervision of Professor C. K. Shum. This study was partially supported by grants from NASA Interdisciplinary Science Program NAG5-9518, and National Science National Space Weather Program ATM- 0418844. This report was also submitted to the Graduate School of the Ohio State University as a dissertation in partial fulfillment of the requirements for the Ph.D. degree. Dedicated satellite gravity missions are anticipated to significantly improve the current knowledge of the Earth’s mean gravity field and its time variable part–climate sensitive gravity signals. They could be measured by the Gravity Recovery and Climate Experiment (GRACE) twin-satellite with sub-centimeter accuracy in terms of column of water movement near the Earth’s surface with a spatial resolution of several hundred kilometers or larger, and a temporal resolution of one month or weeks. To properly recover the time variable gravity signals from space, the gravity measurements require the atmospheric pressure contribution to be accurately modeled and removed. The sparse coverage of measurements makes the weather products less accurate in the southern hemisphere, especially over the Southern Ocean and Antarctica. The asynoptic observation from GPS radio occultation could achieve dense spatial coverage even in remote regions. In this research, we investigate the potential use of GPS occultation to improve the pressure modeling over Antarctica. Atmospheric pressure profiles are retrieved and validated against ECMWF, NCEP and radiosonde observations. Our results show that occultation can provide compatible observations especially in the upper atmosphere. Large standard deviations and biases are found near the ground and in the Antarctic region. GPS occultation in the polar regions is less affected by multipath problem and can penetrate down near the ... Report Antarc* Antarctic Antarctica Southern Ocean Ohio State University (OSU): Knowledge Bank Antarctic Southern Ocean The Antarctic |
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Ohio State University (OSU): Knowledge Bank |
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English |
description |
This report was prepared by Shengjie Ge, a graduate research associate in the Geodetic Science and surveying program of the Department of Geological Science at the Ohio State University, under the supervision of Professor C. K. Shum. This study was partially supported by grants from NASA Interdisciplinary Science Program NAG5-9518, and National Science National Space Weather Program ATM- 0418844. This report was also submitted to the Graduate School of the Ohio State University as a dissertation in partial fulfillment of the requirements for the Ph.D. degree. Dedicated satellite gravity missions are anticipated to significantly improve the current knowledge of the Earth’s mean gravity field and its time variable part–climate sensitive gravity signals. They could be measured by the Gravity Recovery and Climate Experiment (GRACE) twin-satellite with sub-centimeter accuracy in terms of column of water movement near the Earth’s surface with a spatial resolution of several hundred kilometers or larger, and a temporal resolution of one month or weeks. To properly recover the time variable gravity signals from space, the gravity measurements require the atmospheric pressure contribution to be accurately modeled and removed. The sparse coverage of measurements makes the weather products less accurate in the southern hemisphere, especially over the Southern Ocean and Antarctica. The asynoptic observation from GPS radio occultation could achieve dense spatial coverage even in remote regions. In this research, we investigate the potential use of GPS occultation to improve the pressure modeling over Antarctica. Atmospheric pressure profiles are retrieved and validated against ECMWF, NCEP and radiosonde observations. Our results show that occultation can provide compatible observations especially in the upper atmosphere. Large standard deviations and biases are found near the ground and in the Antarctic region. GPS occultation in the polar regions is less affected by multipath problem and can penetrate down near the ... |
format |
Report |
author |
Ge, Shengjie, 1973- |
spellingShingle |
Ge, Shengjie, 1973- GPS Radio Occultation and the Role of Atmospheric Pressure on Spaceborne Gravity Estimation Over Antarctica |
author_facet |
Ge, Shengjie, 1973- |
author_sort |
Ge, Shengjie, 1973- |
title |
GPS Radio Occultation and the Role of Atmospheric Pressure on Spaceborne Gravity Estimation Over Antarctica |
title_short |
GPS Radio Occultation and the Role of Atmospheric Pressure on Spaceborne Gravity Estimation Over Antarctica |
title_full |
GPS Radio Occultation and the Role of Atmospheric Pressure on Spaceborne Gravity Estimation Over Antarctica |
title_fullStr |
GPS Radio Occultation and the Role of Atmospheric Pressure on Spaceborne Gravity Estimation Over Antarctica |
title_full_unstemmed |
GPS Radio Occultation and the Role of Atmospheric Pressure on Spaceborne Gravity Estimation Over Antarctica |
title_sort |
gps radio occultation and the role of atmospheric pressure on spaceborne gravity estimation over antarctica |
publisher |
Ohio State University. Division of Geodetic Science |
publishDate |
2006 |
url |
http://hdl.handle.net/1811/78642 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_relation |
Ohio State University. Geodetic Science and Surveying. Report. no. 479 http://hdl.handle.net/1811/78642 |
op_rights |
This item may be protected by copyright, and is made available here for research and educational purposes. The user is responsible for making a final determination of copyright status. If copyright protection applies, permission must be obtained from the copyright holder to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to the law. |
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1800740603823128576 |