期刊
JOURNAL OF PHYSICAL OCEANOGRAPHY
卷 51, 期 3, 页码 685-699出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/JPO-D-20-0101.1
关键词
Pacific Ocean; Boundary currents; Mesoscale processes; Eddies; Seasonal variability
类别
资金
- National Natural Science Foundation of China [41776021, 41730534, 41421005]
- National Key Research and Development Program of China [2020YFA0608801, 2017YFA0603202, 2012YQ12003907]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB42010102]
- NSFC Shiptime Sharing Project [NORC2019-09, 41849909]
- Major Project of Science and Technology Innovation of Shan Dong [2018SDKJ0105]
Seasonal modulation of subthermocline eddy kinetic energy (EKE) east of the Philippines shows significant north-south variation, mainly caused by the seasonal modulation of barotropic instability.
Seasonal modulation of subthermocline eddy kinetic energy (EKE) east of the Philippines and its associated dynamics are studied, using mooring measurements and outputs from an eddy-resolving ocean general circulation model for the period from 2000 to 2017. Significantly high EKE appears below the thermocline in the latitude band between 5 degrees and 14 degrees N east of the Philippines. Separated by 10 degrees N, the EKE in the northern and southern parts of the region shows nearly opposite seasonal cycles, with its magnitude reaching a maximum in early spring and minimum in summer in the northern part and reaching a maximum in summer and minimum in winter in the southern part of the region. Further investigation indicates that both baroclinic and barotropic instabilities are essential in generating the subthermocline eddies, but the seasonal variation of subthermocline EKE is mainly caused by the seasonal modulation of barotropic instability. The seasonal modulation of barotropic instability in the northern and southern part of the region is associated with the seasonal evolution of North Equatorial Undercurrent and Halmahera Eddy, respectively.
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