气候变化领域集成服务门户(CCPortal): Amplified tropical Pacific rainfall variability related to background SST warming

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DOI	10.1007/s00382-020-05119-3
	Amplified tropical Pacific rainfall variability related to background SST warming
	Sun N.; Zhou T.; Chen X.; Endo H.; Kitoh A.; Wu B.
发表日期	2020
ISSN	0930-7575
起始页码	2387
结束页码	2402
卷号	54
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).
英文关键词	Background SST; El Niño; Precipitation interannual variability; Tropical Pacific
语种	英语
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)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145579
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
推荐引用方式 GB/T 7714	Sun N.,Zhou T.,Chen X.,et al. Amplified tropical Pacific rainfall variability related to background SST warming[J],2020,54.
APA	Sun N.,Zhou T.,Chen X.,Endo H.,Kitoh A.,&Wu B..(2020).Amplified tropical Pacific rainfall variability related to background SST warming.Climate Dynamics,54.
MLA	Sun N.,et al."Amplified tropical Pacific rainfall variability related to background SST warming".Climate Dynamics 54(2020).