DOI: 10.1007/s00382-017-3844-1
Scopus记录号: 2-s2.0-85026842548
论文题名: Observational evidence of the downstream impact on tropical rainfall from stratospheric Kelvin waves
作者: Zhang L. ; Karnauskas K.B. ; Weiss J.B. ; Polvani L.M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-09-10 起始页码: 3775
结束页码: 3782
语种: 英语
英文关键词: Intraseasonal variability
; Kelvin waves
; Precipitation
; Sounding observations
; Stratosphere
; Tropical convection
; Tropopause
Scopus关键词: atmospheric convection
; Kelvin wave
; precipitation (climatology)
; radiosonde
; rainfall
; seasonal variation
; stratosphere
; tropical meteorology
; tropopause
英文摘要: Analysis of one continuous decade of daily, high-vertical resolution sounding data from five proximate islands in the western equatorial Pacific region reveals eastward and downward propagating Kelvin waves in the tropical stratosphere, with a zonal wave number one structure and a period of ~15 days. By defining an initiation index, we find that these waves are primarily generated over the western Pacific warm pool and South America–tropical Atlantic sector, consistent with regions of frequent deep convection. The zonal phase speed of the stratospheric Kelvin waves (SKWs) is relatively slow (~10 m s−1) over the initiation region due to coupling with deep convection, and becomes much faster (~30–40 m s−1) once decoupled from the downstream troposphere. SKWs have significant impacts on downstream tropical rainfall through modulation of tropopause height. The cold phase of SKWs at tropopause leads to higher tropopause heights and more convection in tropics—with opposite impacts associated with the warm phase. Downstream tropical precipitation anomalies associated with these SKWs also propagate eastward with the same speed and zonal scale as observed SKWs. Interannual variability of the amplitude of the SKWs is shown to be associated with the Quasi-Biennial oscillation (QBO); implications for predictability are discussed. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109305
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, United States; Department of Applied Physics and Applied Mathematics and Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States
Recommended Citation:
Zhang L.,Karnauskas K.B.,Weiss J.B.,et al. Observational evidence of the downstream impact on tropical rainfall from stratospheric Kelvin waves[J]. Climate Dynamics,2018-01-01,50(2018-09-10)