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  5. 海洋环流观测与数值模拟研究室
Impact of Assimilation of Moored Velocity Data on Low-Frequency Current Estimation in Northwestern Tropical Pacific

文献类型：期刊论文

作者Liu, Danian5,6; Wang, Fan4; Zhu, Jiang3; Wang, Dongxiao2,5; Wang, Jianing4; Xie, Qiang1; Shu, Yeqiang6
刊名JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
出版日期2020-09-01
卷号125期号:9页码:18
关键词moored current ensemble optimal interpolation northwestern tropical Pacific
ISSN号2169-9275
DOI10.1029/2019JC015829
英文摘要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.
WOS关键词EQUATORIAL UNDERCURRENT JETS ; ENSEMBLE KALMAN FILTER ; SALINITY PROFILES ; OPTIMAL INTERPOLATION ; OCEAN FORECASTS ; ZONAL CURRENTS ; ROSSBY-WAVE ; TEMPERATURE ; SURFACE ; VARIABILITY
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
语种英语
WOS记录号WOS:000576619900006
出版者AMER GEOPHYSICAL UNION
资助机构National Key Research and Development Program of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; Chinese Academy of Sciences Foundation ; High Performance Computing Division
源URL[http://ir.idsse.ac.cn/handle/183446/7954]  
专题深海科学研究部_海洋环流观测与数值模拟研究室
通讯作者Shu, Yeqiang
作者单位1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
2.Sun Yat Sen Univ, Sch Marine Sci, Guangzhou, Peoples R China
3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China
4.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
5.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Peoples R China
6.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China
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.

入库方式： OAI收割

来源：深海科学与工程研究所

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