GSTDTAP  > 气候变化
DOI10.1007/s00382-017-3844-1
Observational evidence of the downstream impact on tropical rainfall from stratospheric Kelvin waves
Zhang, Lei1; Karnauskas, Kristopher B.1,2; Weiss, Jeffrey B.2; Polvani, Lorenzo M.3,4
2018-05-01
发表期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2018
卷号50页码:3775-3782
文章类型Article
语种英语
国家USA
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 similar to 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 (similar to 10 m s(-1)) over the initiation region due to coupling with deep convection, and becomes much faster (similar to 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.


英文关键词Stratosphere Kelvin waves Tropopause Tropical convection Sounding observations Intraseasonal variability Precipitation
领域气候变化
收录类别SCI-E
WOS记录号WOS:000429650700036
WOS关键词QUASI-BIENNIAL OSCILLATION ; DEEP CONVECTION ; QBO ; TROPOPAUSE ; PRECIPITATION ; VARIABILITY ; TROPOSPHERE
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/35509
专题气候变化
作者单位1.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA;
2.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA;
3.Columbia Univ, Dept Appl Phys & Appl Math, New York, NY USA;
4.Columbia Univ, Dept Earth & Environm Sci, New York, NY USA
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Zhang, Lei,Karnauskas, Kristopher B.,Weiss, Jeffrey B.,et al. Observational evidence of the downstream impact on tropical rainfall from stratospheric Kelvin waves[J]. CLIMATE DYNAMICS,2018,50:3775-3782.
APA Zhang, Lei,Karnauskas, Kristopher B.,Weiss, Jeffrey B.,&Polvani, Lorenzo M..(2018).Observational evidence of the downstream impact on tropical rainfall from stratospheric Kelvin waves.CLIMATE DYNAMICS,50,3775-3782.
MLA Zhang, Lei,et al."Observational evidence of the downstream impact on tropical rainfall from stratospheric Kelvin waves".CLIMATE DYNAMICS 50(2018):3775-3782.
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