Impact of Assimilation of Moored Velocity Data on Low-Frequency Current Estimation in Northwestern Tropical Pacific

doi:10.1029/2019JC015829

IOCAS-IR

	Impact of Assimilation of Moored Velocity Data on Low-Frequency Current Estimation in Northwestern Tropical Pacific
	Liu, Danian 1,2; Wang, Fan3 ; Zhu, Jiang 4; Wang, Dongxiao 2,5; Wang, Jianing3 ; Xie, Qiang 6; Shu, Yeqiang 1
	2020-09-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
卷号	125 期号:9 页码:18
通讯作者	Shu, Yeqiang([email protected])
摘要	This study investigates the impact of assimilation of Northwestern Tropical Pacific Ocean (NWTPO) moored currents observation system on low-frequency (over a period of more than 90 days) current estimation. A low-frequency scale-selective ensemble optimal interpolation (EnOI) scheme is designed to assimilate the horizontally sparse moored currents into an eddy-permitting ocean model. In this assimilation scheme, low-frequency current signals are selected by removing intraseasonal signals in both observation and ensemble data, and a horizontal spatial filter is implemented to match the model forecast to the low-frequency ensemble and observation. The assimilation of currents efficiently resolves simulated low-frequency current displacements, especially for the Equatorial Undercurrent (EUC), the North Equatorial Countercurrent (NECC), and the North Equatorial Current (NEC). More realistic intensities of the NWTPO low-frequency currents are also reproduced. With respect to the moored velocity profiles, the root-mean-square error (RMSE) of the simulated low-frequency zonal velocity above a 500-m depth is reduced from 10.9 to 5.8 cm/s using this low-frequency EnOI scheme. The low-frequency variation of NWTPO currents is reproduced by correcting the structures of different baroclinic modes. The increments of zonal velocities mainly correspond to the first baroclinic mode for the NECC and NEC, while for the EUC, they correspond to the leading three and higher-order baroclinic modes. The improvements of the simulated stratification and pressure gradient remark the role of the assimilation of moored currents in adjusting available potential energy.
关键词	moored current ensemble optimal interpolation northwestern tropical Pacific
DOI	10.1029/2019JC015829
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2016YFC1401702]; National Key Research and Development Program of China[2016YFC1401705]; National Key Research and Development Program of China[2017YFA0603202]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11010000]; National Natural Science Foundation of China[41521005]; National Natural Science Foundation of China[91958202]; National Natural Science Foundation of China[4190060387]; National Natural Science Foundation of China[91858203]; Chinese Academy of Sciences Foundation[CXJJ-19-C18]; High Performance Computing Division
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000576619900006
出版者	AMER GEOPHYSICAL UNION
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/168942
专题	中国科学院海洋研究所
通讯作者	Shu, Yeqiang
作者单位	1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China 2.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 5.Sun Yat Sen Univ, Sch Marine Sci, Guangzhou, Peoples R China 6.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Liu, Danian,Wang, Fan,Zhu, Jiang,et al. Impact of Assimilation of Moored Velocity Data on Low-Frequency Current Estimation in Northwestern Tropical Pacific[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2020,125(9):18.
APA	Liu, Danian.,Wang, Fan.,Zhu, Jiang.,Wang, Dongxiao.,Wang, Jianing.,...&Shu, Yeqiang.(2020).Impact of Assimilation of Moored Velocity Data on Low-Frequency Current Estimation in Northwestern Tropical Pacific.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,125(9),18.
MLA	Liu, Danian,et al."Impact of Assimilation of Moored Velocity Data on Low-Frequency Current Estimation in Northwestern Tropical Pacific".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 125.9(2020):18.

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