Interannual variability of eddy kinetic energy in the South China Sea related to two types of winter circulation events

Wenlian LI; Qinyan LIU; Wendong FANG; Tingting ZU; Haiying CHEN

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Interannual variability of eddy kinetic energy in the South China Sea related to two types of winter circulation events

Physics | Updated：2024-10-12

- Interannual variability of eddy kinetic energy in the South China Sea related to two types of winter circulation events
- Interannual variability of eddy kinetic energy in the South China Sea related to two types of winter circulation events
- 海洋湖沼学报(英文) 2023年41卷第3期页码：831-851
- Affiliations：
  
  1.University of Chinese Academy of Sciences, Beijing 100049, China
  2.South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 528200, China
  3.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 528200, China
  4.CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  5.Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
  6.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
- Author bio：
  
  qyliu66@scsio.ac.cn
- Funds：
  
  the Science and Technology Basic Resources Investigation Program of China(2017FY201402);the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)(GML 2019ZD0304);the National Key Research and Development Program of China(2017YFC1404000);the National Natural Science Foundation of China(41876017;42176027;41628601;41706027;41776014);the Guangzhou Science and Technology Plan Project(202102080364);the Guangdong Basic and Applied Basic Research Foundation(2022A1515011863);the State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology Chinese Academy of Sciences(LTOZZ2101;LTOZZ2102)
- DOI：
  中图分类号：
- 收稿：2021-07-20，
  
  纸质出版：2023-05-01
- Accepted：
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Interannual variability of eddy kinetic energy in the South China Sea related to two types of winter circulation events[J]. 海洋湖沼学报(英文), 2023,41(3):831-851.

LI Wenlian,LIU Qinyan,FANG Wendong,et al.Interannual variability of eddy kinetic energy in the South China Sea related to two types of winter circulation events[J].Journal of Oceanology and Limnology,2023,41(03):831-851.
Interannual variability of eddy kinetic energy in the South China Sea related to two types of winter circulation events[J]. 海洋湖沼学报(英文), 2023,41(3):831-851. DOI：

LI Wenlian,LIU Qinyan,FANG Wendong,et al.Interannual variability of eddy kinetic energy in the South China Sea related to two types of winter circulation events[J].Journal of Oceanology and Limnology,2023,41(03):831-851. DOI：

摘要

Abstract

Interannual variations of the eddy kinetic energy (EKE) related to two types of winter circulation events (“O” and “U”) were investigated based on the outputs of the Ocean General Circulation Model (OGCM) for the Earth Simulator (OFES) and the corresponding energetic analyses. Results show that the EKE is strong and extends eastward to offshore the Vietnam coast about 2°

associated with the weaker South China Sea western boundary current (SCSwbc) in “O” type years

while the EKE is weak and high value that can be attained is narrowed along the coast

associated with the stronger SCSwbc in “U” type years. The energy budget shows that the wind stress and barotropic/baroclinic instability are important factors to regulate the EKE in “U” and “O” years. For “U” years

under a strong winter monsoon forcing

the SCSwbc strengthen

the directly wind work and barotropic conversion from the mean kinetic energy (MKE) to EKE are weak

thus the EKE decrease corresponding to the baroclinic conversion from the kinetic energy to potential energy. However

the situation is reversed in “O” years. Under the influence of El Niño events

wind stress forces can weaken SCSwbc and enhance EKE in pattern “O”

whereas La Niña events have relatively weaker influences. The barotropic conversion rate in “O” type is nearly eight times of the “U” type. The pressure work and advection term are the main sources to greatly suppress EKE in the SCSwbc region.

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references

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