TOPEX/POSEIDON高度计资料用于中国近海M_2分潮的同化反演  

ASSIMILATION OF THE M_2 TIDES IN CHINA SEAS WITH TOPEX/POSEIDON DATA

作　　者：丘仲锋[1] 何宜军[1] 

机构地区：[1]中国科学院海洋研究所

出　　处：《海洋与湖沼》2005年第4期376-384,共9页Oceanologia Et Limnologia Sinica

基　　金：物理海洋教育部重点实验室开放课题基金资助项目;200307号;中国科学院海洋研究所领域前沿项目"卫星高度计在海洋动力过程中的应用研究"资助;KZCX2202号。

摘　　要：以整个中国海为研究区域,把开边界取在TOPEX/POSEIDON(T/P)高度计资料数据点,利用趋近插值法将高度计资料同化到二维非线性潮汐数值模式中,反演了中国近海M2分潮的分布。计算结果与60个验潮站资料比较,符合良好振幅平均绝对偏差为6.7cm,相角偏差为5.5°,均方根偏差为12.6cm。根据计算结果给出东中国海和南海M2分潮的同潮图,与相关文献比较,符合良好。研究结果表明,以本方法利用T/P资料来反演中国海潮汐是可行的。China seas include all the marine territories of China. In these regions, tides are the main contributors to ocean dynamics. Conditions such as complex coastlines and bathymetry, large dynamic difference, small tide spatial scale, and shallow water constituents, have driven many scientists to investigate tides. Great amounts of works have been done on tides in the seas, and significant progress has been made. However, previous investigations were mainly focus on some aspects instead of the whole area. In this paper, we treated the China seas as a whole on which the calculation was done. Open boundary conditions are critical for local tidal modeling and usually acquired in two ways: near the open boundary (including in situ data and satellite data) and from global tidal model. In the simulations for the China seas tides, the first way was commonly used. However, for the locations with sparse observation, interpolation or other methods would be used to get tidal values in the open boundary points, and man-made bias that would bring about significant calculation error, is unavoidable. Therefore, we chose the track points of TOPEX/POSEIDON as the open boundary points, and set directly the M_2 tidal values in the track points as the open boundary values, to eliminate the artificial errors. Although the precision of investigating global tides with TOPEX/POSEIDON data is considerably high, it is still not good enough in near-shore, especially shallow water. To enhance the precision, various assimilation methods can be used. In our case, a method similar to nudging, was used. In this paper, M_2 tidal harmonic constants in the China seas were extracted from about 10-year TOPEX/POSEIDON altimetry data along the track points, and were assimilated into a two-dimension non-linear tidal model with the nudging method. The governing equations of the numerical model were the classic barotropic nonlinear shallow water ones. The TOPEX/POSEIDON data were put into the model with the factor β, the assimilation coefficient whose value

关 键 词：高度计 开边界 M2分潮 同化 

分 类 号：P731.23[天文地球—海洋科学]