DOI: 10.1007/s00382-013-1888-4
Scopus记录号: 2-s2.0-84899911374
论文题名: The upper-level circulation anomaly over Central Asia and its relationship to the Asian monsoon and mid-latitude wave train in early summer
作者: Watanabe T. ; Yamazaki K.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-09-10 起始页码: 2477
结束页码: 2489
语种: 英语
英文关键词: Asian summer monsoon
; Intraseasonal variability
; Madden-Julian oscillation
; Mid-latitude wave train
英文摘要: A large intraseasonal variation in geopotential height over the Central Asia region, where the Asian subtropical jet is located, occurs between May and June, and the most dominant variation has a wave-like distribution. This variation in geopotential height influences precipitation across South and Southeast Asia. In this paper, we use composite analysis to determine the causes of this intraseasonal variation over Central Asia. The wave train propagates from the northern Atlantic Ocean to Central Asia over a period of a week, and generates an anomaly in geopotential height over the region. The tropical disturbance, which is similar to the Madden-Julian oscillation, appears a few days before the maximum of the anticyclonic anomaly over Central Asia, and is accompanied by active convection over the Indian Ocean and suppressed convection over Central America. Results of numerical experiments using a linear baroclinic model show that the active convection over the northern Indian Ocean causes the anticyclonic anomaly over Central Asia. The wave train that extends from the northern Atlantic Ocean to Central Asia is generated by negative thermal forcing over Central America, and the phase distribution of this wave train is similar to that observed in the composite analysis. Central Asia is the region where the effects of the tropics and middle latitudes overlap, and it is an important connection point between the Asian monsoon and middle latitudes. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54693
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Graduate School of Environmental Science, Hokkaido University, Kita 10, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0810, Japan; Research and Information Center, Tokai University, Tokyo, Japan; Hokkaido University, Sapporo, Japan; National Institute of Polar Research, Tachikawa, Japan
Recommended Citation:
Watanabe T.,Yamazaki K.. The upper-level circulation anomaly over Central Asia and its relationship to the Asian monsoon and mid-latitude wave train in early summer[J]. Climate Dynamics,2014-01-01,42(2017-09-10)