GOCE卫星数据确定的全球稳态海面地形和海表地转流  

Mean dynamic topography and geostrophic surface circulation calculated by GOCE satellite data

作　　者：苏勇 于冰 王继燕 杨莹辉 肖东升 

机构地区：[1]西南石油大学土木工程与建筑学院,成都610500

出　　处：《地球物理学进展》2017年第4期1483-1489,共7页Progress in Geophysics

基　　金：国家自然科学基金(41574018;41404018);大地测量与地球动力学国家重点实验室开放基金(SKLGED2017-2-1-E)联合资助

摘　　要：利用GOCE卫星235天的观测数据恢复了200阶次的重力场模型SWJTU-GO01S,结合欧空局提供的最新GOCE重力场模型和CNES-CLS 2011平均海面高模型,计算了全球稳态海面地形和海表地转流,并采用GRACE模型、多源数据同化模型和海洋浮标观测数据对GOCE模型的计算结果进行对比分析.结果表明:由于重力场模型精度和分辨率较高,GOCE计算结果所需的滤波半径小于GRACE结果;GOCE和GRACE模型的计算结果与CNES-CLS09稳态海面地形差异的RMS分别为6 cm和7 cm左右;与海洋浮标实测数据对比发现,GOCE和GRACE的计算结果与实测数据差异明显,但GOCE的计算结果优于GRACE结果,而SWJTU-GO01S与DIR-R4和TIM-R4模型在全球范围内具有较好的一致性.整体而言,GOCE比GRACE数据的计算结果可以反映更小尺度地转流,且计算的精度更高;海洋环流结果和水准数据的对比表明SWJTU-GO01S与DIR-R4和TIM-R4模型的精度符合性较好,三者计算的地转流精度基本相当.A global static gravity field model entitled SWJTUGO01 S up to degree and order 200 is recovered based on 235 days of GOCE orbit and gradient data with the direct approach.The global mean dynamic topography and geostrophic surface circulation is calculated by combined with the newest ESA GOCE gravity field model and the mean sea surface height model CNES-CLS 2011.The comparison and evaluations of GOCE results are performed with GRACE model,multi-source data assimilation model CNES-CLS09 and in-situ ocean drogue drifter＇s observations.The results show that due to the accuracy and resolution of different gravity field models,the optimal filter length of GOCE model is smaller than GRACE results.The RMS between the mean dynamic topography based on GOCE and GRACE model results with the CNES-CLS09 MDT model are 6 cm and 7 cm respectively.GOCE and GRACE results are significant different to the in-situ ocean drifter＇s measurements,but the GOCE results are better than GRACE,and SWJTU-GO01 S,DIR-R4 and TIM-R4 model are performed consistency on a global scale.Overall,the comparison with GRACE shows that GOCE can provide smaller scale geostrophic circulation information,and GOCE results are more accurate.Ocean circulation results and GPS leveling data results show that the accuracy of SWJTU-GO01 S is closed to DIR-R4 and TIM-R4,geostrophic circulation calculated by three GOCE model are roughly equal.

关 键 词：GOCE卫星 地球重力场模型 稳态海面地形 海洋环流 

分 类 号：P223[天文地球—大地测量学与测量工程]