DOI: 10.1175/JCLI-D-18-0187.1
Scopus记录号: 2-s2.0-85060519167
论文题名: The changing influences of ENSO and the Pacific meridional mode on mesoscale eddies in the South China Sea
作者: Tuo P. ; Yu J.-Y. ; Hu J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 3 起始页码: 685
结束页码: 700
语种: 英语
英文关键词: Eddies
; El Nino
; ENSO
; Monsoons
; Pacific decadal oscillation
; Sea level
Scopus关键词: Atmospheric pressure
; Scintillation
; Sea level
; Wind stress
; Eddies
; EL Nino
; ENSO
; Monsoons
; Pacific decadal oscillation
; Climatology
英文摘要: This study finds that the correlation between El Niño-Southern Oscillation (ENSO) and the activity of mesoscale oceanic eddies in the South China Sea (SCS) changed around 2004. The mesoscale eddy number determined from satellite altimetry observations using a geometry of the velocity vector method was significantly and negatively correlated with the Niño-3.4 index before 2004, but the correlation weakened and became insignificant afterward. Further analyses reveal that the ENSO-eddy relation is controlled by two major wind stress forcing mechanisms: one directly related to ENSO and the other indirectly related to ENSO through its subtropical precursor-the Pacific meridional modes (PMMs). Both mechanisms induce wind stress curl variations over the SCS that link ENSO to SCS eddy activities. While the direct ENSO mechanism always induces a negative ENSO-eddy correlation through the Walker circulation, the indirect mechanism is dominated by the northern PMM (nPMM), resulting in a negative ENSO-eddy correlation before 2004, and by the southern PMM (sPMM) after 2004, resulting in a positive ENSO-eddy correlation. As a result, the direct and indirect mechanisms enhance each other to produce a significant ENSO-eddy relation before 2004, but they cancel each other out, resulting in a weak ENSO-eddy relation afterward. The relative strengths of the northern and southernPMMs are the key to determining the ENSO-eddy relation and may be related to a phase change of the interdecadal Pacific oscillation. © 2019 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117236
Appears in Collections: 气候变化与战略
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Recommended Citation:
Tuo P.,Yu J.-Y.,Hu J.. The changing influences of ENSO and the Pacific meridional mode on mesoscale eddies in the South China Sea[J]. Journal of Climate,2019-01-01,32(3)