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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; jzhu@mail.iap.ac.cn
2012
Source PublicationACTA OCEANOLOGICA SINICA
ISSN0253-505X
Volume31Issue:5Pages:41603
AbstractThe 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.
Department[Zhu Jiang; Li Xichen] Chinese Acad Sci, Inst Atmospher Phys, Beijing 100029, Peoples R China; [Xu Dazhi; Qi Yiquan; Yan Youfang] Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Xu Dazhi] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
KeywordData Assimilation Mean Dynamic Topography Sea Level Anomaly South China Sea
Subject AreaOceanography
Language英语
Funding ProjectLTO
WOS IDWOS:000309856200002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/10111
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorjzhu@mail.iap.ac.cn
Recommended Citation
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,&jzhu@mail.iap.ac.cn.(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.
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