DOI: 10.1175/JCLI-D-17-0781.1
Scopus记录号: 2-s2.0-85052826878
论文题名: The Northward-propagating intraseasonal oscillations in the Northern Indian Ocean during spring-early summer
作者: Li K. ; Feng L. ; Liu Y. ; Yang Y. ; Li Z. ; Yu W.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 17 起始页码: 7003
结束页码: 7017
语种: 英语
英文关键词: Atmosphere
; Intraseasonal variability
; Madden-Julian oscillation
Scopus关键词: Barium compounds
; Climatology
; Earth atmosphere
; Moisture
; Environmental fields
; Intraseasonal oscillations
; Intraseasonal variability
; Madden-Julian oscillation
; Northern indian oceans
; Propagating features
; Tropical Indian ocean
; Vertical wind shear
; Tropical engineering
英文摘要: The intraseasonal oscillations (ISOs) activate in the tropical Indian Ocean (IO), exhibiting distinct seasonal contrasts in active regions and propagating features. The seasonal northward migration of the ISO activity initiates in spring-early summer, composed of two stages. Strong ISO activity first penetrates into the northern Bay of Bengal (BoB) around mid-April, and then extends to the northern Arabian Sea (AS) by mid-May. The northward-propagating ISOs (NPISOs) during their initiation periods, which are referred to as the primary northward-propagating (PNP) events, are analyzed with regard to the BoB and the AS, respectively. In terms of the BoB PNP event, the northward branch could be observed only in the BoB, and the eastward movement is still clear as the winter ISOs. For the AS PNP event, a strong northward branch spreads across the wider northern IO, as obvious as the summer ISOs. The relative roles of the seasonal environmental fields in modulating the PNP events are diagnosed based on a 2.5-layer atmospheric model. The results indicate that the seasonal variations of the surface moisture dominantly regulate the BoB PNP event, while both the surface moisture and the vertical wind shear are necessary for the AS PNP event. Additionally, the leading BoB PNP event is hypothesized to potentially act as a precondition of the following AS PNP event in terms of their internal ISO reinitiation processes and in terms of creating a favorable easterly shear environment in the northern IO. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110698
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Center for Ocean and Climate Research, First Institute of Oceanography, SOA, China; Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
Recommended Citation:
Li K.,Feng L.,Liu Y.,et al. The Northward-propagating intraseasonal oscillations in the Northern Indian Ocean during spring-early summer[J]. Journal of Climate,2018-01-01,31(17)