Geoid and sea surface topography derived from ERS-1 altimeter data by the adjoint method

被引:3
|
作者
Blinken, R [1 ]
Koch, KR [1 ]
机构
[1] Univ Bonn, Inst Theoret Geodesy, D-53115 Bonn, Germany
关键词
satellite altimetry; sea surface heights; geoid undulations; sea surface topography; quasi-geostrophic model; adjoint method;
D O I
10.1023/A:1022080011849
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A method for splitting sea surface height measurements from satellite altimetry into geoid undulations and sea surface topography is presented. The method is based on a combination of the information front altimeter data and a dynamic sea surface height model. The model consists of geoid undulations and a quasi-geostrophic model for expressing the sea surface topography. The goal is the estimation of those values of the parameters of the sea surface height model that provide a least-squares fit of the model to the data. The solution is accomplished by the adjoint method which makes itse of the adjoint model for computing the gradient of the cost function of the least-squares adjustment and an optimization algorithm for obtaining improved parameters. The estimation is applied to the North Atlantic. ERS-1 altimeter data of the year 1993 are used. The resulting geoid agrees well with the geoid of the EGM96 gravity model.
引用
收藏
页码:235 / 250
页数:16
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