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一个三维变分海洋资料同化系统的设计和初步应用 被引量:21

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摘要 介绍了新完成的一个基于三维变分方法的通用海洋资料同化系统OVALS(Ocean Variational Analysis System)的设计方案和在热带太平洋海洋资料同化中的初步应用.OVALS可以同化常规的现场海洋温盐观测资料和卫星高度计资料,其中在海面高度资料同化中引入了一个新的基于三维变分的同化方案,该方案考虑了背景场误差的垂直相关性和非线性的温-盐关系.非线性的温-盐关系是通过将三维变分方法中的线性平衡约束方案推广到非线性的情况来实现的,从而通过同化高度计资料来直接调整模式的温度和盐度场.另外,OVALS还可以同化近年来投入运行的国际ARGO漂流浮标的温、盐廓线资料以及其他海温和盐度资料,如船报海温资料和一些浮标阵列资料等.利用OVALS和大洋环流模式在热带太平洋进行了21a的同化试验.试验结果表明,同化系统通过对各种海洋资料的同化,可以有效改进对海洋温度和盐度的估计,其在420m深度以浅的上层海洋的月平均温、盐度估计误差分别为0.63℃和0.34psu.
出处 《中国科学(D辑)》 CSCD 北大核心 2007年第2期261-271,共11页 Science in China(Series D)
基金 中国科学院知识创新方向性项目(批准号:KZCX3-SW-222) 国家自然科学基金(批准号:60225015 40221503)资助
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参考文献44

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