DOI: 10.1007/s00382-012-1492-z
Scopus记录号: 2-s2.0-84875731783
论文题名: Structures and mechanisms of the first-branch northward-propagating intraseasonal oscillation over the tropical Indian Ocean
作者: Li K. ; Yu W. ; Li T. ; Murty V.S.N. ; Khokiattiwong S. ; Adi T.R. ; Budi S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-07-08 起始页码: 1707
结束页码: 1720
语种: 英语
英文关键词: Intraseasonal oscillation
; Monsoon onset
; Northward propagation
英文摘要: The first-branch northward-propagating intraseasonal oscillation (FNISO) over the tropical Indian Ocean (IO) often triggers the onset of the Asian summer monsoon. In this study we investigate the structures and mechanisms associated with FNISO through the diagnosis of ERA-Interim reanalysis data for the period of 1990-2009. A composite analysis is conducted to reveal the structure and evolution characteristics of the FNISO and associated background circulation changes. It is found that the FNISO convection originates from the southwestern IO and propagates eastward. After reaching the eastern IO, the major convective branch moves northward toward the northern Bay of Bengal (BoB). Two possible mechanisms may contribute to the northward propagation of the FNISO. One is the meridional asymmetry of the background convective instability. A greater background convective instability over the northern BoB may destabilize Rossby waves and cause convection to shift northward. The other is the meridional phase leading of perturbation humidity in the planetary boundary layer (PBL). Maximum PBL moisture appears to the north of the convection center, which promotes a convectively unstable stratification ahead of the convection and leads to the northward propagation of the FNISO. A PBL moisture budget analysis reveals that anomalous zonal advection is a dominant process in contributing to the moisture asymmetry. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55068
Appears in Collections: 过去全球变化的重建
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作者单位: Center for Ocean and Climate Research, First Institute of Oceanography, SOA, Qingdao, 266061, China; IPRC and Department of Meteorology, University of Hawaii, Honolulu, HI, United States; National Institute of Oceanography Regional Centre, Visakhapatnam, 530017, India; Phuket Marine Biology Center, Phuket, Thailand; Agency for Marine and Fishery Research and Development, Center for Marine and Coastal Resources Research and Development, Jakarta, Indonesia
Recommended Citation:
Li K.,Yu W.,Li T.,et al. Structures and mechanisms of the first-branch northward-propagating intraseasonal oscillation over the tropical Indian Ocean[J]. Climate Dynamics,2013-01-01,40(2017-07-08)