SCSIO OpenIR  > 热带海洋环境国家重点实验室(LTO)
Dynamics on Seasonal Variability of EKE Associated with TIWs in the Eastern Equatorial Pacific Ocean
Wang, Minyang; Du, Yan; Qui, Bo1; Xie, Shang-Ping; Feng, Ming5
2019
Source PublicationJOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN0022-3670
Volume49Issue:6Pages:1503
AbstractEnergetic mesoscale eddies (vortices) associated with tropical instability waves (TIWs) exist in the eastern equatorial Pacific Ocean between 0 degrees and 8 degrees N. This study examines the seasonal variations in eddy kinetic energy (EKE) of TIWs using in situ and satellite observations and elucidates the underlying dynamical mechanisms. The results reveal that the cross-equatorial southerly winds are key to sustaining the high-level EKE (up to similar to 600 cm(2) s(-2)) from boreal summer to winter in 0 degrees-6 degrees N and 155 degrees-110 degrees W. Because of the beta effect and the surface wind divergence, the southerly winds generate anticyclonic wind curls north of the equator that intensify the sea surface temperature (SST) fronts and force the downwelling annual Rossby waves. The resultant sea surface height ridge induces strong horizontal current shears between 0 degrees and 5 degrees N. The intensified current shears and SST fronts generate EKE via barotropic and baroclinic instabilities, respectively. To the extent that the seasonal migration of a northward-displaced intertropical convergence zone intensifies the southerly winds north of, but not south of, the equator, our study suggests that the climatic asymmetry is important for the oceanic eddy generations in the eastern equatorial Pacific Ocean-a result with important implications for coupled climate simulation/prediction.
DepartmentLTO
DOI10.1175/JPO-D-18-0163.1
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17714
Collection热带海洋环境国家重点实验室(LTO)
Affiliation1.Univ Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Beijing, Peoples R China; Univ Chinese Acad Sci, Beijing, Peoples R China
2.Univ Hawaii Manoa, Dept Oceanog, Honolulu, HI 96822 USA
3.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA
4.Ocean Univ China, Phys Oceanog Lab, CIMST, Qingdao, Shandong, Peoples R China
5.Natl Lab Marine Sci & Technol, Qingdao, Shandong, Peoples R China
6.CSIRO Oceans & Atmosphere, Crawley, WA, Australia
Recommended Citation
GB/T 7714
Wang, Minyang,Du, Yan,Qui, Bo,et al. Dynamics on Seasonal Variability of EKE Associated with TIWs in the Eastern Equatorial Pacific Ocean[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2019,49(6):1503, 1519.
APA Wang, Minyang,Du, Yan,Qui, Bo,Xie, Shang-Ping,&Feng, Ming.(2019).Dynamics on Seasonal Variability of EKE Associated with TIWs in the Eastern Equatorial Pacific Ocean.JOURNAL OF PHYSICAL OCEANOGRAPHY,49(6),1503.
MLA Wang, Minyang,et al."Dynamics on Seasonal Variability of EKE Associated with TIWs in the Eastern Equatorial Pacific Ocean".JOURNAL OF PHYSICAL OCEANOGRAPHY 49.6(2019):1503.
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