物理学报2012，Vol.61Issue(14)：543-550,8.
模式误差弱约束四维变分同化研究
Study of weak constraint 4dvar with model error forcing control variable
摘要
Abstract
In the traditional implementations of four-dimensional variational data assimilation（4dvar for short）,it is assumed that the model used is perfect.However the model error in the model can directly affect the accuracy of data assimilation.The weak constraint 4dvar is an effective way of correcting and estimating the model error in 4dvar.In this paper,an approach to weak constraint 4dvar with model error forcing control variable is studied and implemented in the one-dimensional shallow water equations.The results show that when the model error cannot be ignored,the prediction error with the weak constraint 4dvar is smaller than with the traditional 4dvar in both the assimilation window and the prediction period,and the improvement with weak constraint 4dvar is more obvious in the condition with large model error.Also,the weak constraint 4dvar approach to estimating model error captures some basic features of model error including the magnitude and the characteristic of distribution.关键词
模式误差/弱约束四维变分同化/一维浅水方程组Key words
model error/weak constraint 4dvar/one-dimensional shallow water equations分类
天文与地球科学引用本文复制引用
钟剑,费建芳,黄思训,杜华栋..模式误差弱约束四维变分同化研究[J].物理学报,2012,61(14):543-550,8.基金项目
国家自然科学基金 （）
国家公益性行业专项（批准号：GYHY201106004）资助的课题~~ （）
