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Reconstructing Ocean Surface Current Combining Altimetry and Future Spaceborne Doppler Data
Journal of Geophysical Research: Oceans ( IF 3.6 ) Pub Date : 2021-02-13 , DOI: 10.1029/2020jc016560
Clement Ubelmann 1, 2 , Gérald Dibarboure 3 , Lucile Gaultier 4 , Aurélien Ponte 5 , Fabrice Ardhuin 5 , Maxime Ballarotta 2 , Yannice Faugère 2
Affiliation  

Two methods for the mapping of ocean surface currents from satellite measurements of sea level and future current vectors are presented and contrasted. Both methods rely on the linear and Gaussian analysis framework with different levels of covariance definitions. The first method separately maps sea level and currents with single‐scale covariance functions and leads to estimates of the geostrophic and ageostrophic circulations. The second maps both measurements simultaneously and projects the circulation onto four contributions: geostrophic, ageostrophic rotary, ageostrophic divergent, and inertial. When compared to the first method, the second mapping moderately improves the resolution of geostrophic currents but significantly improves estimates of the ageostrophic circulation, in particular near‐inertial oscillations. This method offers promising perspectives for reconstructions of the ocean surface circulation. Even the hourly dynamics can be reconstructed from measurements made locally every few days because nearby measurements are coherent enough to help fill the gaps. Based on numerical simulation of ocean surface currents, the proposed SKIM mission that combines a nadir altimeter and a Doppler scatterometer with a 300 km wide swath (with a mean revisit time of 3 days) would allow the reconstruction of 50% of the near‐inertial variance around an 18 h period of oscillation.

中文翻译:

结合测高仪和未来星载多普勒数据重建海面海流

提出并对比了两种从卫星海平面测量和未来海流矢量绘制海面海流的方法。两种方法都依赖于具有不同级别协方差定义的线性和高斯分析框架。第一种方法使用单尺度协方差函数分别绘制海平面和洋流图,并得出地转和年龄变化环流的估计值。第二个地图同时绘制了两个测量值,并将循环投影到四个部分:地转,年龄变质的旋转,年龄变质的发散和惯性。与第一种方法相比,第二种映射方法适度地改善了地转流的分辨率,但显着改善了对地转环流的估计,特别是近惯性振荡。该方法为海面环流的重建提供了广阔的前景。即使是每小时动态,也可以从每隔几天在本地进行的测量中重建,因为附近的测量足够连贯,可以帮助填补空白。基于海面洋流的数值模拟,拟议的SKIM任务将最低点高度计和多普勒散射仪与300 km宽的测绘带相结合(平均重访时间为3天),将允许重建近惯性力的50%在18小时的振荡周期内变化。
更新日期:2021-03-18
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