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Yang Qian,Liu Hailong,Lin Pengfei,Li Yiwen. 2020. Kuroshio intrusion in the Luzon Strait in an eddy-resolving ocean model and air-sea coupled model. Acta Oceanologica Sinica, 39(11):52-68
Kuroshio intrusion in the Luzon Strait in an eddy-resolving ocean model and air-sea coupled model
涡分辨率海洋模式及其海气耦合模式中吕宋海峡处的黑潮入侵
Received:June 13, 2020  
DOI:10.1007/s13131-020-1670-5
Key words:Kuroshio intrusion  South China Sea  eddy-resolving model  air-sea coupled model
中文关键词:  黑潮入侵  南海  涡分辨率模式  海气耦合模式
基金项目:The National Key R&D Program for Developing Basic Sciences under contract Nos 2018YFA0605703, 2016YFC1401401 and 2016YFC1401601; the Strategic Priority Research Program of Chinese Academy of Sciences under contract No. XDB42010404; the National Natural Science Foundation of China under contract Nos 41976026, 41776030, 41931183, 41931182 and 41576026.
Author NameAffiliationE-mail
Yang Qian State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 
 
Liu Hailong State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 
lhl@lasg.iap.ac.cn 
Lin Pengfei State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 
 
Li Yiwen State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 
 
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Abstract:
      The Kuroshio intrusion in a quasi-global eddy-resolving model (LICOMH) and a fully air-sea coupled model (LICOMHC) was evaluated against observations. We found that the Kuroshio intrusion was exaggerated in the former, while biases were significantly attenuated in the latter. Luzon Strait transport (LST) in winter was reduced from –8.8×106 m3/s in LICOMH to –6.0×106 m3/s in LICOMHC. Further analysis showed that different LST values could be explained by different large-scale and local surface wind stresses and the eddies east to the Luzon Strait as well. The relatively stronger cyclonic eddies in LICOMH northeast of the Luzon Island led to weak Kuroshio transport and strong intrusion through the Luzon Strait. The summed transport of all three factors was approximately 2.0×106 m3/s, which was comparable with the difference in LST between the two experiments. The EKE budget showed that strong EKE transport and the baroclinic transformation term led to strong cyclonic eddies east of the Kuroshio in LICOMH, while surface winds contributed little to the differences in the eddies.
中文摘要:
      比较了准全球涡分辨率海洋模式(简记为LICOMH)及其海气耦合模式(简记为LICOMHC)中的黑潮入侵南海与观测中黑潮入侵的差异。我们发现在单独海洋模式中黑潮入侵与观测相比过强,而在其海气耦合模式中这一差异得到了改善。冬季的吕宋海峡输送(LST)在LICOMH中为-8.8×106 m3s-1,而在LICOMHC中则下降到-6.0×106 m3s-1 。进一步的研究表明是大尺度风场,局地风应力和吕宋海峡以东中尺度涡旋的共同作用导致了黑潮入侵在两个模式中的不同。LICOMH中吕宋岛东北部相对较强的气旋导致了较弱的黑潮输送及吕宋海峡处较强的黑潮入侵。以上三者共同作用造成的LST差异大约是2.0×106 m3s-1,与两个模式间的LST差异大小基本相当。进一步对LICOMH与LICOMHC中的EKE收支进行分析表明,LICOMH中更强的EKE输送及斜压转换项导致了黑潮以东存在更强的气旋,而海表风场对两个模式中的涡旋差异贡献极小。
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