极地研究

极地研究 ›› 2008, Vol. 20 ›› Issue (1): 14-22.

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联合卫星重力和卫星测高确定南极绕极流

张子占;陆洋;许厚泽;陈红霞;   

  • 出版日期:2008-03-30 发布日期:2008-03-30

THE ANTARCTIC CIRCUMPOLAR CURRENT DERIVED FROM THE SATELLITE GRAVITY GEOID AND ALTIMETRY DATA

  • Online:2008-03-30 Published:2008-03-30

PDF (PC)

1863

被引次数

14

摘要：

联合基于GRACE重力卫星观测资料恢复的重力场模型(EIGEN-GL04S1)和卫星测高推求的平均海面高模型(KMSS04)来构造南极绕极流区域的平均海面动力地形,并利用小波滤波方法去掉短波及噪声信号,进而推算大、中尺度的绕极流。与非卫星重力场模型、同化资料及海洋水文资料确定相应结果的验证分析表明:基于新的卫星重力场模型推算的南极绕极流区域的海面动力地形、PF、SAF和表层流场等都与海洋学结果相吻合,且局部特征更加清晰。表明卫-卫跟踪重力卫星计划确定的地球重力场模型较之以前存在的重力场模型在中长波部分精度有较大提高,从大地测量(从空间)角度来探测南极绕极流已达到较高的精度。

关键词: 卫星重力;卫星测高;南极绕极流;GRACE

Abstract:

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.