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首页> 外文期刊>Pure and Applied Geophysics >Mediterranean Surface Geostrophic Circulation from Satellite Gravity and Altimetry Observations
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Mediterranean Surface Geostrophic Circulation from Satellite Gravity and Altimetry Observations

机译：地中海表面从卫星重力和高度偏移观测中的出色循环

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摘要

We present a data-based approach to study the mean and the climatology of the surface geostrophic currents (SGC) for the Mediterranean Sea, using satellite ocean surface altimetry observations for 22 years (1993-2014) in conjunction with the geoid solution derived from the space mission of GOCE (gravity field and steady-state ocean circulation explorer; Release 4). The resultant product is the Mediterranean SGC velocity field, that we denote by SGC and monthly time resolution. It exhibits smaller scales and lower dynamic intensities in comparison with open oceans, making the Mediterranean Sea a challenging test case for our satellite-based analysis. The mean SGC is largely consistent with previous findings but with additional circulation features in time and space. We also compare our results with the SGC output from the regional hydrodynamic model of Mercator that assimilates satellite altimetry, satellite sea surface temperature, and in situ observations. The prominent SGC features agree well not only on the large and subbasin scales but also in the widespread mesoscale dynamics. We find, however, comparatively lower intensities than the Mercator model in general, with differences that are on average around 7 cm/s, but might reach 13 cm/s in some coastal areas.
机译：我们提出了一种基于数据的方法来研究地中海的地表嗜热电流（SGC）的平均值和气候学，使用22年（1993-2014）与来自的大型木质溶液结合使用卫星海洋表面高度观测衰竭的空间使命（重力场和稳态海洋循环探险者;第4版）。结果产品是地中海SGC速度字段，我们表示通过SGC和月度时间分辨率。它与开放海洋相比，它表现出较小的尺度和更低的动态强度，使地中海海洋成为我们卫星的分析的具有挑战性的测试用例。平均SGC与先前的调查结果一致，但随着时间和空间的额外循环特征。我们还将结果与SGC输出的SGC输出从Mercator的区域流体动力学模型进行了比较，这些模型同化卫星高度，卫星海面温度，卫星海面温度和原位观察。突出的SGC功能不仅符合大型和子巴西尺度，而且在广泛的Mesoscale Dynamics中同意。然而，我们发现比Mercator模型一般的强度相对较低，差异平均约为7厘米/秒，但在某些沿海地区可能达到13厘米/秒。

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