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

在这个项目中，现代重力和测高卫星数据将与现场海洋数据、地表热通量、净淡水和动量、河流流量和海洋环流模型相结合，以根据卫星重力和测高观测确定海洋质量输送和质量变化，并结合海洋热量输送和热量储存变化，从海洋质量输送和进入海洋的净淡水通量来解释它们的差异。我们的中心重点将是海洋中物质和淡水在季节和年际时间尺度上的重新分配，它与大气和陆地水运输和储存的联系，以及海洋在全球淡水循环中的作用。该项目将有三个具有高度互补性和相互关联性的分项目，范围从全球范围的海洋再分析和涡旋解析建模，到区域和地方核查尝试。通过我们的方法估计的区域和全球淡水通量将与NWP估计进行比较，我们对径流的估计将与本战略计划1257中陆地水文研究的结果进行比较。我们的估计将依赖于全球和区域大地水准面模型，并将用于测试它们与海洋观测的一致性。这项工作将是联合估算海洋和大地水准面的先决条件。

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.