DOI: 10.1175/JCLI-D-14-00580.1
Scopus记录号: 2-s2.0-84942039448
论文题名: A triggering mechanism for the Indian Ocean dipoles independent of ENSO
作者: Sun S. ; Lan J. ; Yue Fang T. ; Gao X.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 13 起始页码: 5063
结束页码: 5076
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Climate change
; Climate system
; Indian Ocean dipole
; Indian summer monsoon
; Interannual variability
; Summer monsoon
; Triggering mechanism
; Tropical Indian ocean
; Wind anomalies
; Climatology
; annual variation
; El Nino-Southern Oscillation
; Indian Ocean Dipole
; monsoon
; sea surface temperature
; temperature anomaly
; wind forcing
; zonal wind
; Bay of Bengal
; Indian Ocean
英文摘要: Although the IndianOcean dipole (IOD) andENSOare significantly correlated, there are indeed some IODs independent of ENSO. In this research, the characteristics of independent IOD are investigated and a new triggeringmechanismis proposed based on case study and statistical analysis. Results showthat the independent IODs peak in an earlier season and have a weaker intensity compared with the IODs associated with ENSO. The wind anomaly associated with the independent IOD is very unique and shows a monsoonlike pattern, in addition to the equatorial easterly wind anomaly (EEWA) common to all IODs. The evolution of the EEWA associated with the independent IOD is well captured by the second EOF mode of the equatorial zonal wind interannual variability, suggesting that the independent IOD is an important climate mode inherent to the tropical Indian Ocean. The EEWA associated with the independent IOD is tightly linked to Indian summer monsoon activities in spring, and the convection anomalies associated with early summer monsoon onset in the Bay of Bengal plays a key role in inducing the EEWA. The EEWA can persist through spring and summer and causes a series of processes similar to those related to the IODs associated with ENSO. The correlation between the independent IOD and Indian summer monsoon activities increases dramatically after the 1980s, which is probably due to the mean state change in the tropical Indian Ocean climate system. © 2015 American Meteorological Society. 资助项目: NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50405
Appears in Collections: 气候变化事实与影响
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作者单位: Center for Ocean and Climate Research, First Institute of Oceanography, State Oceanic Administration, Qingdao, China; Physical Oceanography Laboratory, Ocean University of China, Qingdao, China
Recommended Citation:
Sun S.,Lan J.,Yue Fang T.,et al. A triggering mechanism for the Indian Ocean dipoles independent of ENSO[J]. Journal of Climate,2015-01-01,28(13)