我国东部海域高精度地转流的确定方法

The determination method of high precision geostrophic currents in East China Sea

针对目前带有高频信息的全球稳态海面地形模型的计算过程比较复杂的问题,该文采用移去恢复法,对由全球海面高模型得到稳态海面地形模型添加高频信息,并用新模型计算我国东部海域的地转流,分析其精度。结果表明:使用卫星重力场模型GOCE_TIM5,全球平均海面高模型CNES-CLS15,计算出分辨率为15′×15′我国东部海域的地转流,高频信息不明显;采用移去恢复法,利用GOCE_TIM5模型、CNES-CLS15模型、全球稳态海面地形模型CNES-CLS13,得到相同分辨率我国东部海域的地转流,与未采用移去恢复法相比,其结果中细节信息明显,与全球实测浮标数据更为接近,其精度与由全球稳态海面地形模型CNES-CLS13得到结果相当。

Aiming at the problem that the calculation process for the global mean dynamic topography model with high-frequency information is relatively complex,the remove-restore method was used to add high-frequency information to the mean dynamic topography model obtained from the global mean sea surface model,and to use the new model to calculate the East China Sea in this paper.The geostrophic currents was calculated and its accuracy was analyzed.The conclusions were as follows:using the satellite gravity field model GOCE _TIM5,the global mean sea surface model CNES-CLS15,the geostrophic currents with a resolution of 15′×15′in the East China Sea was calculated,the high frequency information was not obvious,and the remove-restore method was not used.The GOCE_TIM5model, the CNES-CLS15 model,and the global mean dynamic topography model CNES-CLS13 obtained geostrophic currents of the same resolution in the East China Sea.Compared to not using the removerestore method,high-frequency information were obvious,and geostrophic currents were closer to the result of the measured drifter data,and its accuracy were similar to that obtained by the global mean dynamic topography model CNES-CLS13.