The impact of mean dynamic topography on a sea-level anomaly assimilation in the South China Sea based on an eddy-resolving model

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	The impact of mean dynamic topography on a sea-level anomaly assimilation in the South China Sea based on an eddy-resolving model
	Xu, DZ ; Zhu, J ; Qi, YQ ; Li, XC ; Yan, YF
刊名	ACTA OCEANOLOGICA SINICA
	2012
卷号	31 期号:5 页码:41603
关键词	data assimilation mean dynamic topography sea level anomaly South China Sea
ISSN号	0253-505X
通讯作者	jzhu@mail.iap.ac.cn
中文摘要	The sea-level anomaly (SLA) from a satellite altimeter has a high accuracy and can be used to improve ocean state estimation by assimilation techniques. However, the lack of an accurate mean dynamic topography (MDT) is still a bothersome issue in an ocean data assimilation. The previous studies showed that the errors in MDT have significant impacts on assimilation results, especially on the time-mean components of ocean states and on the time variant parts of states via nonlinear ocean dynamics. The temporal-spatial differences of three MDTs and their impacts on the SLA analysis are focused on in the South China Sea (SCS). The theoretical analysis shows that even for linear models, the errors in MDT have impacts on the SLA analysis using a sequential data assimilation scheme. Assimilation experiments, based on EnOI scheme and HYCOM, with three MDTs from July 2003 to June 2004 also show that the SLA assimilation is very sensitive to the choice of different MDTs in the SCS with obvious differences between the experimental results and observations in the centre of the SCS and in the vicinity of the Philippine Islands. A new MDT for assimilation of SLA data in the SCS was proposed. The results from the assimilation experiment with this new MDT show a marked reduction (increase) in the RMSEs (correlation coefficient) between the experimental and observed SLA. Furthermore, the subsurface temperature field is also improved with this new MDT in the SCS.
学科主题	Oceanography
语种	英语
WOS记录号	WOS:000309856200002
公开日期	2013-08-28
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10111]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Xu, DZ,Zhu, J,Qi, YQ,et al. The impact of mean dynamic topography on a sea-level anomaly assimilation in the South China Sea based on an eddy-resolving model[J]. ACTA OCEANOLOGICA SINICA,2012,31(5):41603.
APA	Xu, DZ,Zhu, J,Qi, YQ,Li, XC,&Yan, YF.(2012).The impact of mean dynamic topography on a sea-level anomaly assimilation in the South China Sea based on an eddy-resolving model.ACTA OCEANOLOGICA SINICA,31(5),41603.
MLA	Xu, DZ,et al."The impact of mean dynamic topography on a sea-level anomaly assimilation in the South China Sea based on an eddy-resolving model".ACTA OCEANOLOGICA SINICA 31.5(2012):41603.