Combined Ocean-Geodetic Analysis of Global and Regional Ocean Mass-, and Freshwater Transport Divergences

在本项目中，现代卫星重力和测高数据将与现场海洋数据、关于地表热量通量、净淡水和动量、河流流量和海洋环流模型的信息结合使用，以根据卫星重力和测高观测确定海洋物质输运和物质变化，并从海洋物质输运和流入海洋的净淡水通量方面解释其差异，与海洋热传输和热储存变化相结合。我们的中心重点将是在季节性和年际时间尺度上海洋中的质量和淡水的重新分配，其与大气和陆地水的运输和储存的联系，以及海洋在全球淡水循环中的作用。该项目将有三个子项目，这些子项目高度互补和相互关联，范围从全球尺度的海洋再分析和涡流解析建模，到区域和当地的验证尝试。通过我们的方法估计的区域和全球淡水地表通量将与NWP估计值进行比较，我们的径流估计值将与SPP 1257中的陆地水文研究结果进行比较。我们的估计将依赖于全球和区域大地水准面模型，并将用于测试其与海洋观测的一致性。这项工作将是联合海洋和大地水准面估计尝试的先决条件。

In this project modern satellite data of gravity and altimetry will be used in combination with in situ ocean data, information about surface fluxes of heat, net freshwater and momentum, river-discharge and ocean circulation models to determine ocean mass transports and mass changes from satellite observations of gravity and altimetry, and to interpret their divergences in terms of ocean mass transports and net freshwater fluxes into the ocean, in combination with ocean heat transports and heat storage changes. Our central focus will be the redistribution of mass and freshwater in the ocean on the seasonal and inter annual time scale, its connection to atmospheric and terrestrial water transports and storages, and the oceans role in the global freshwater cycle. The project will have three subprojects, which are highly complementary and interconnected and which range from global scale ocean reanalyses and eddy-resolving modeling, to regional and local verification attempts. Regional and global surface fluxes of freshwater estimated through our approach will be compared with NWP estimates and our estimates of run-off will be compared with results from terrestrial hydrology studies within this SPP 1257. Our estimats will rely on global and regional geoid models and will be used to test their consistency with ocean observations. This work will be a pre-requisit for joint ocean and geoid estimation attempts.