The tidal signals extraction from GPS data on the Amery Ice Shelf, Antarctica |
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| Authors: | ShengKai Zhang DongChen E Fei Li JiFeng Huang YuanSheng Li ZeMin Wang and XiaoHong Zhang |
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| Institution: | 1. Chinese Antarctic Center of Surveying and Mapping, School of Geodesy and Geomatics, Wuhan University, Wuhan, Hubei 430079, China
2. Key Laboratory of Polar Surveying and Mapping, State Bureau of Surveying and Mapping, Wuhan, Hubei 430079, China;1. Chinese Antarctic Center of Surveying and Mapping, School of Geodesy and Geomatics, Wuhan University, Wuhan, Hubei 430079, China
2. Key Laboratory of Polar Surveying and Mapping, State Bureau of Surveying and Mapping, Wuhan, Hubei 430079, China;1. Chinese Antarctic Center of Surveying and Mapping, School of Geodesy and Geomatics, Wuhan University, Wuhan, Hubei 430079, China
2. Key Laboratory of Polar Surveying and Mapping, State Bureau of Surveying and Mapping, Wuhan, Hubei 430079, China;1. Chinese Antarctic Center of Surveying and Mapping, School of Geodesy and Geomatics, Wuhan University, Wuhan, Hubei 430079, China
2. Key Laboratory of Polar Surveying and Mapping, State Bureau of Surveying and Mapping, Wuhan, Hubei 430079, China;Polar Research Institute of China, Shanghai 200136, China;1. Chinese Antarctic Center of Surveying and Mapping, School of Geodesy and Geomatics, Wuhan University, Wuhan, Hubei 430079, China
2. Key Laboratory of Polar Surveying and Mapping, State Bureau of Surveying and Mapping, Wuhan, Hubei 430079, China;Chinese Antarctic Center of Surveying and Mapping, School of Geodesy and Geomatics, Wuhan University, Wuhan, Hubei 430079, China |
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| Abstract: | Tidal motion is the source of short-term vertical motion that an ice shelf experiences, and hence has a significant impact on ice shelves. During the 2003/2004 Austral summer season, five days of GPS measurements were carried out on the front of the Amery Ice Shelf (AIS), East Antarctica, by the 20th Chinese National Antarctica Research Expedition (CHINARE). The GPS data was processed using GAMIT/GLOBK software with 2-hour static data segment and the vertical precision is less than 0.18 m. To verify our results for the vertical component, we compare the ice shelf GPS tidal signal with a tidal result derived from tide gauge measurements at China's Zhongshan Station on Antarctica. Comparison of the GPS results with the tide gauge were in good agreement in amplitude at the few cm level, which indicates that the tide under the front of Amery Ice Shelf is irregular semidiurnal tide, the maximal tidal differences is approximately 2 m. GPS data can be used to validate the ocean tide model around the Antarctic area and such studies are important to improve our knowledge of the Antarctic ice shelf mass balance and dynamical models of ice sheet/ocean interaction. |
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| Keywords: | Antarctica Amery Ice Shelf GPS tidal signal |
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