气候变化领域集成服务门户(CCPortal): Observed Tightening of Tropical Ascent in Recent Decades and Linkage to Regional Precipitation Changes

CCPortal

DOI	10.1029/2019GL085809
	Observed Tightening of Tropical Ascent in Recent Decades and Linkage to Regional Precipitation Changes
	Su H.; Wu L.; Zhai C.; Jiang J.H.; Neelin J.D.; Yung Y.L.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
英文摘要	Climate models predict that the tropical ascending region should tighten under global warming, but observational quantification of the tightening rate is limited. Here we show that the observed spatial extent of the relatively moist, rainy and cloudy regions in the tropics associated with large-scale ascent has been decreasing at a rate of −1%/decade (−5%/K) from 1979 to 2016, resulting from combined effects of interdecadal variability and anthropogenic forcings, with the former contributing more than the latter. The tightening of tropical ascent is associated with an increase in the occurrence frequency of extremely strong ascent, leading to an increase in the average precipitation rate in the top 1% of monthly rainfall in the tropics. At the margins of the convective zones such as the Southeast Amazonia region, the contraction of large-scale ascent is related to a long-term drying trend about −3.2%/decade in the past 38 years. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Boiler circulation; Bolt tightening; Climate models; Drying; Global warming; Precipitation (chemical); Precipitation (meteorology); ascent; Combined effect; Convective zone; Inter-decadal variability; ITCZ; Monthly rainfalls; Precipitation change; Precipitation rates; Tropics; anthropogenic effect; atmospheric circulation; climate forcing; climate modeling; decadal variation; global warming; intertropical convergence zone; precipitation (climatology); precipitation intensity; regional climate; tropical environment; Amazonia
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170785
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Su H.,Wu L.,Zhai C.,et al. Observed Tightening of Tropical Ascent in Recent Decades and Linkage to Regional Precipitation Changes[J],2020,47(3).
APA	Su H.,Wu L.,Zhai C.,Jiang J.H.,Neelin J.D.,&Yung Y.L..(2020).Observed Tightening of Tropical Ascent in Recent Decades and Linkage to Regional Precipitation Changes.Geophysical Research Letters,47(3).
MLA	Su H.,et al."Observed Tightening of Tropical Ascent in Recent Decades and Linkage to Regional Precipitation Changes".Geophysical Research Letters 47.3(2020).