DOI: 10.1007/s00382-016-3137-0
Scopus记录号: 2-s2.0-84964412514
论文题名: The influence of tropical forcing on extreme winter precipitation in the western Himalaya
作者: Cannon F. ; Carvalho L.M.V. ; Jones C. ; Hoell A. ; Norris J. ; Kiladis G.N. ; Tahir A.A.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-03-04 起始页码: 1213
结束页码: 1232
语种: 英语
英文关键词: El Nino southern oscillation
; Extreme precipitation events
; Karakoram
; Madden–Julian oscillation
; Tropical forcing
英文摘要: Within the Karakoram and western Himalaya (KH), snowfall from winter westerly disturbances (WD) maintains the region’s snowpack and glaciers, which melt seasonally to sustain water resources for downstream populations. WD activity and subsequent precipitation are influenced by global atmospheric variability and tropical-extratropical interactions. On interannual time-scales, El Niño related changes in tropical diabatic heating induce a Rossby wave response over southwest Asia that is linked with enhanced dynamical forcing of WD and available moisture. Consequently, extreme orographic precipitation events are more frequent during El Niño than La Niña or neutral conditions. A similar spatial pattern of tropical diabatic heating is produced by the MJO at intraseasonal scales. In comparison to El Niño, the Rossby wave response to MJO activity is less spatially uniform over southwest Asia and varies on shorter time-scales. This study finds that the MJO’s relationship with WD and KH precipitation is more complex than that of ENSO. Phases of the MJO propagation cycle that favor the dynamical enhancement of WD simultaneously suppress available moisture over southwest Asia, and vice versa. As a result, extreme precipitation events in the KH occur with similar frequency in most phases of the MJO, however, there is a transition in the relative importance of dynamical forcing and moisture in WD to orographic precipitation in the KH as the MJO evolves. These findings give insight into the dynamics and predictability of extreme precipitation events in the KH through their relationship with global atmospheric variability, and are an important consideration in evaluating Asia’s water resources. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: NASA, National Aeronautics and Space Administration
; NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53366
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, University of California, Santa Barbara, CA, United States; Earth Research Institute, University of California, Santa Barbara, CA, United States; Physical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, United States; Department of Environmental Science, COMSATS Institute of Information Technology, Islamabad, Pakistan
Recommended Citation:
Cannon F.,Carvalho L.M.V.,Jones C.,et al. The influence of tropical forcing on extreme winter precipitation in the western Himalaya[J]. Climate Dynamics,2017-01-01,48(2017-03-04)