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《Chinese Journal of Polar Research》 2008-01
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THE ANTARCTIC CIRCUMPOLAR CURRENT DERIVED FROM THE SATELLITE GRAVITY GEOID AND ALTIMETRY DATA

Zhang Zizhan1,2, Lu Yang1, Xu Houze1, Chen Hongxia3 (1 Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China; 2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China; 3 First Institute of Oceanography, SOA, Qingdao 266061, China)  
Combining a new geoid model (EIGEN-GL04S) recovered from GRACE mission and the KMSS04 model, a new mean dynamic ocean topography (MDT) model are estimated over the Antarctic region. The surface Antarctic Circumpolar Current (ACC) field and its Polar Front (PF) and sub-Antarctic Front (SAF) are derived from MDT after filtering with a wavelet denoising method. Comparing the MDT, surface ACC, PF and SAF with those from previous geoid model (EGM96)/altimetry, merged MDT and the ocean hydrological data (WOA01), separately, the results show that the ACC from GRACE agree well with WOA01 map in general, and reveal more details than all other results. These indicate that the accuracy of EIGEN-GL04S model has been improved greatly over pre-existing models at long wavelengths and the ACC detected by satellite measurement has reached relatively high precision at large and middle scale.
【Fund】: 科技部863计划项目(2006AA12Z128);; 国家自然科学基金项目(40506011)资助
【CateGory Index】: P714.1
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