Assimilation of High Frequency Radar Data into a Shelf Sea Circulation Model

doi:10.1007/s11802-014-2224-2

	Assimilation of High Frequency Radar Data into a Shelf Sea Circulation Model
	Xu Jiangling; Huang Juan; Gao Song; Cao Yajing
刊名	JOURNAL OF OCEAN UNIVERSITY OF CHINA
	2014-08
卷号	13 期号:4 页码:572-578
关键词	data assimilation current radar shelf circulation model
ISSN号	1672-5182
DOI	10.1007/s11802-014-2224-2
英文摘要	High Frequency (HF) radar current data is assimilated into a shelf sea circulation model based on optimal interpolation (OI) method. The purpose of this work is to develop a real-time computationally highly efficient assimilation method to improve the forecast of shelf current. Since the true state of the ocean is not known, the specification of background error covariance is arduous. Usually, it is assumed or calculated from an ensemble of model states and is kept in constant. In our method, the spatial covariances of model forecast errors are derived from differences between the adjacent model forecast fields, which serve as the forecast tendencies. The assumption behind this is that forecast errors can resemble forecast tendencies, since variances are large when fields change quickly and small when fields change slowly. The implementation of HF radar data assimilation is found to yield good information for analyses. After assimilation, the root-mean-square error of model decreases significantly. Besides, three assimilation runs with variational observation density are implemented. The comparison of them indicates that the pattern described by observations is much more important than the amount of observations. It is more useful to expand the scope of observations than to increase the spatial interval. From our tests, the spatial interval of observation can be 5 times bigger than that of model grid.
资助项目	North China Sea Branch Scientific Foundation[2014B10]
WOS研究方向	Oceanography
语种	英语
出版者	OCEAN UNIV CHINA
WOS记录号	WOS:000339093900004
内容类型	期刊论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/3806]
专题	自然资源部第一海洋研究所
作者单位	State Ocean Adm, North China Sea Marine Forecast Ctr, Qingdao 266061, Peoples R China
推荐引用方式 GB/T 7714	Xu Jiangling,Huang Juan,Gao Song,et al. Assimilation of High Frequency Radar Data into a Shelf Sea Circulation Model[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2014,13(4):572-578.
APA	Xu Jiangling,Huang Juan,Gao Song,&Cao Yajing.(2014).Assimilation of High Frequency Radar Data into a Shelf Sea Circulation Model.JOURNAL OF OCEAN UNIVERSITY OF CHINA,13(4),572-578.
MLA	Xu Jiangling,et al."Assimilation of High Frequency Radar Data into a Shelf Sea Circulation Model".JOURNAL OF OCEAN UNIVERSITY OF CHINA 13.4(2014):572-578.