DOI: 10.1007/s00382-020-05119-3
论文题名: Amplified tropical Pacific rainfall variability related to background SST warming
作者: Sun N. ; Zhou T. ; Chen X. ; Endo H. ; Kitoh A. ; Wu B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2020
卷: 54, 期: 2020-03-04 语种: 英语
英文关键词: Background SST
; El Niño
; Precipitation interannual variability
; Tropical Pacific
Scopus关键词: annual variation
; atmospheric general circulation model
; atmospheric moisture
; El Nino
; El Nino-Southern Oscillation
; rainfall
; sea surface temperature
; warming
; winter
; Pacific Ocean
; Pacific Ocean (Tropical)
英文摘要: Previous studies have found that under global warming, El Niño/Southern Oscillation (ENSO)-related rainfall variability will become enhanced over the tropical central-eastern Pacific and weakened over the western Pacific. The climatological sea surface temperature (SST) warming pattern exhibits a warming center in the equatorial eastern Pacific in projections. How this pattern contributes to projected changes in ENSO-driven rainfall variability has not been fully addressed. Here, we use “time-slice” experiments to investigate the response of interannual variability in tropical Pacific rainfall in boreal winter to a warming background SST and associated physical mechanisms. A high-resolution Atmosphere General Circulation Model is driven by the detrended observational SST (1979–2003) plus a warming pattern from the coupled model under the A1B emission scenario (2075–2099). The results show that precipitation interannual variability over the tropical central-eastern Pacific will be enhanced more than the surrounding regions under warming, which is mostly contributed by a faster increase in rainfall amount during the El Niño year relative to non-El Niño years. Based on a moisture budget analysis, both the dynamic and thermodynamic components in the vertical advection of climatological specific humidity contribute to the enhancement of El Niño-induced precipitation anomalies in the tropical central-eastern Pacific where the dynamic effect is dominant. Moist static energy budget analysis further illustrates that vertical velocity is enhanced due to the increased transport of moist static energy from the lower troposphere into the middle-upper troposphere and the intensified warming effect of cloud longwave radiation caused by the increase of high cloud amount and altitude. © 2020, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159947
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of the Chinese Academy of Sciences, Beijing, 100049, China; Meteorological Research Institute, Tsukuba, Japan; Japan Meteorological Business Support Center, Tsukuba, Japan
Recommended Citation:
Sun N.,Zhou T.,Chen X.,et al. Amplified tropical Pacific rainfall variability related to background SST warming[J]. Climate Dynamics,2020-01-01,54(2020-03-04)