Application of altimetry data assimilation on mesoscale eddies simulation
Application of altimetry data assimilation on mesoscale eddies simulation
复制标题
测高数据同化在中尺度涡流模拟中的应用
DOI：
10.1007/s11430-007-0152-3
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发表时间：
2008-01
期刊：
影响因子：
--
通讯作者：
Li MingKui
中科院分区：
文献类型：
--
作者：
Chen YongLi;Wang Fan;Zhu Jiang;Gao Shan;Yan ChangXiang;Li MingKui
中尺度涡旋在海洋环流中起着重要作用。为了提高中尺度涡的模拟精度，将三维变分资料同化系统海洋变分分析系统(OVALS)与POM模式相结合，对西北太平洋中尺度涡进行了数值模拟。该系统将卫星测高得到的海面高度距平资料同化为拟S温盐剖面资料。然后，将这些剖面数据作为观测数据进行再次同化，生成三维分析器-Sfield。根据中尺度涡旋的特点，建立了最合适的同化参数，并在该系统中进行了验证。进行了为期10年的中尺度涡旋模拟对比试验，包括同化方案和非同化方案。两种方案与观测结果的对比结果表明，同化方案的模拟精度远好于非同化方案，验证了测高资料同化方法能显著提高中尺度的模拟精度，表明该系统在未来的中尺度涡旋预报中是有可能的。
Mesoscale eddy plays an important role in the ocean circulation. In order to improve the simulation accuracy of the mesoscale eddies, a three-dimensional variation (3DVAR) data assimilation system called Ocean Variational Analysis System (OVALS) is coupled with a POM model to simulate the mesoscale eddies in the Northwest Pacific Ocean. In this system, the sea surface height anomaly (SSHA) data by satellite altimeters are assimilated and translated into pseudo temperature and salinity (T-S) profile data. Then, these profile data are taken as observation data to be assimilated again and produce the three-dimensional analysisT-Sfield. According to the characteristics of mesoscale eddy, the most appropriate assimilation parameters are set up and testified in this system. A ten years mesoscale eddies simulation and comparison experiment is made, which includes two schemes: assimilation and non-assimilation. The results of comparison between two schemes and the observation show that the simulation accuracy of the assimilation scheme is much better than that of non-assimilation, which verified that the altimetry data assimilation method can improve the simulation accuracy of the mesoscale dramatically and indicates that it is possible to use this system on the forecast of mesoscale eddies in the future.
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