摘要
利用欧空局发布的三组GOCE引力场模型及CNES-CLS 2010平均海面高数据,计算得到了全球的稳态海面地形,进而得到了全球地转流速度图.在此基础上重点对黑潮进行了对比分析.结果表明:GOCE不同组解的稳定性较好,所计算的稳态海面地形的差异基本在厘米量级内,这间接表明了GOCE引力场模型提供的大地水准面的精度达到了厘米量级.此外,通过将GOCE与GRACE相应结果进行对比发现,GOCE可提供更多的局部信息,特别是对于流速快、水流窄的边界流,如黑潮、墨西哥湾流等,GOCE所得结果更加清晰,速度也更精确.
Global mean dynamic topographies （MDT） are computed with three groups of GOCE gravity field models and CNES-CLS2010 mean sea surface height （MSS）, and then geostrophic surface currents are also computed. Finally Kuroshio is analyzed emphatically. The results show that the different GOCE gravity field models are stable, i. e. , the differences of MDT calculated using different GOCE gravity field models are all less than several centimeters. It indicates the accuracy of geoid provided by GOCE arrives at magnitude of centimeter. The comparison with GRACE shows that GOCE can provide more local information of the currents. Especially for the boundary currents such as Kuroshio and the Gulf Stream which are fast and narrow, the result from GOCE is much clearer and the velocity is more accurate. Hence, GOCE is more appropriate for research on the currents than GRACE.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第6期1850-1856,共7页
Chinese Journal of Geophysics
基金
国家自然科学基金(41074015
41104047)
武汉大学地球空间环境与大地测量教育部重点实验室开放基金(11-01-07)共同资助
关键词
GOCE引力场模型
稳态海面地形
洋流
GOCE gravity field model
Mean dynamic topography
Ocean current
