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学科主题: Oceanography
题名: The impact of mean dynamic topography on a sea-level anomaly assimilation in the South China Sea based on an eddy-resolving model
作者: Xu, DZ ; Zhu, J ; Qi, YQ ; Li, XC ; Yan, YF
通讯作者: jzhu@mail.iap.ac.cn
关键词: data assimilation ; mean dynamic topography ; sea level anomaly ; South China Sea
刊名: ACTA OCEANOLOGICA SINICA
发表日期: 2012
卷: 31, 期:5, 页:41603
部门归属: [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
项目归属: LTO
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.
语种: 英语
WOS记录号: WOS:000309856200002
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10111
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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Recommended Citation:
Xu, DZ; Zhu, J; Qi, YQ; Li, XC; Yan, YF.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,2012,31(5):41603
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