利用最新GOCE重力场模型确定南极绕极流  

The Antarctic Circumpolar Current Derived from the Newest GOCE Gravity Field Model

作　　者：彭利峰[1] 姜卫平[1] 金涛勇[2] 赵倩[1] 

机构地区：[1]武汉大学卫星导航定位技术研究中心,武汉市珞喻路129号430079 [2]武汉大学测绘学院,武汉市珞喻路129号430079

出　　处：《武汉大学学报（信息科学版）》2013年第11期1266-1270,共5页Geomatics and Information Science of Wuhan University

基　　金：国家重点基础研究发展计划资助项目(2012CB957703);地理空间信息工程国家测绘地理信息局重点实验室开放基金资助项目(201323);地球空间环境与大地测量教育部重点实验室测绘基础研究基金资助项目(11-02-07)

摘　　要：利用最新的纯GOCE重力场模型GO_CONS_GCF_2_TIM_R4及由多源多代卫星测高数据确定的精细平均海平面高模型WHU2009,基于地转平衡方程确定了南极绕极流,其流幅的变化趋势与由海洋实测数据获取的SAF和PF锋面保持一致。将其分别与GRACE、多源数据同化模型CNES-CLS09和NOAA海洋实测数据结果进行了比较分析,结果表明,确定南极绕极流在u、v方向与海洋实测结果差异分别为10.1cm/s和5.3cm/s;在大尺度上,结果与同化模型和实测数据结果具有较好的一致性,明显优于GRACE结果,并且在大陆沿岸附近海域略优于多源数据同化模型CNES-CLS09;此外,利用本结果还可有效探测威德尔旋回和罗斯旋回等中尺度涡。The Antarctic Circumpolar Current（ACC） is an important factor effecting global o- cean and climate systems. Based on the WHU2009 mean sea surface height model derived from multi-altimetric data, the newest satellite-only GOCE gravity field model GO_CONS_ GCF 2 TIM_R4 is used to determine the Antarctic Circumpolar Current through the geo- strophic balance equation, the trend of its width variations is consistent with the Subantarctic and Polar fronts of the ACC derived from in situ measurements. To confirm that the ACC re- sults in this paper are reliable, three different types of models were compared with our mod- el. Comparative results show that： the difference between our model and the in-situ meas- urements provided by NOAA was 10.1 cm/s in u direction and 5.3 cm/s in v direction; The ACC results presented in this paper are consistent with the CNES-CLS09 model and the NO- AA results at the large scale, as well as superior to the result from GRACE, and also slight- ly better than CNES-CLS09 in offshore areas. In addition, some meso-scale eddies like the Wed- del Gyre and Ross Gyre are also determined from the ACC results presented in this paper.

关 键 词：南极绕极流 稳态海面地形 海洋环流 高斯滤波 

分 类 号：P228[天文地球—大地测量学与测量工程]