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《Chinese Journal of Geophysics》 2016-09
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The determination of absolute sea level changes of the Antarctic coast tidal gauges from 1994 to 2014 and its analysis

KE Hao;LI Fei;ZHANG Sheng-Kai;MA Chao;WANG Ai-Xue;China Antarctic Center of Surveying and Mapping,Wuhan University;School of Geodesy and Geomatics,Wuhan University;  
The Antarctic region is the birthplace of global sea level change,and it has great scientific significance to study the sea level change surrounding the Antarctica continent.In view of the effect on precision of altimetry caused by floating sea ice in waters around Antarctica,and the tidal cycle aliasing effect is needed to be taken into account when using satellite altimetry sequence to analyze the sea level periodic dynamic changes.For this reason,this paper carried out a research on the absolute sea level change surrounding the Antarctica continent from 1994to2014 by using GPS tracking stations and tidal gauges.The results showed that the largest absolute sea level change in all 15 tidal gauges around the Antarctic is 11.10±0.04mm·a~(-1) at Diego Ramirez station.In the Drake passage adjacent to the Antarctic peninsula,the sea level changes are the most active,where the average change is 8.31±0.05mm·a~(-1).In the east Antarctica,the absolute sea level changes of four tidal gauges Syowa,Mawson,Davis and Casey,are relatively stable and slow.The average change rate of above four tidal gauges is 3.35±0.04 mm·a~(-1).The absolute sea level change at Scott Base station is as fast as 9.61±0.07mm·a~(-1),which is nearby Ross Island in the lower right side of Ross ice shelf.According to the sea level change calculation results,it can be concluded that the sea level change rates of the Drake passage adjacent to the Antarctic peninsula and Ross sea are higher than entire southern ocean sea level change.While the latter is approximately equal to the average change rate of four tidal gauges which are located in the east Antarctica.These reflect the sea level change differences among the different sea areas around the Antarctica.As a consequence,partitioned study of sea level change is more desirable and can better understand the ice shelf collapse and melting situation in different areas.
【Fund】: 国家自然科学基金(41506120 41531069 41176173);; 南北极环境综合考察与评估专项资助项目(CHINARE-01-03);; 中国极地科学战略研究基金(20150307)资助
【CateGory Index】: P731.23;P715
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