globalchange  > 气候变化与战略
DOI: 10.1029/2019GL085809
Title:
Observed Tightening of Tropical Ascent in Recent Decades and Linkage to Regional Precipitation Changes
Author: Su H.; Wu L.; Zhai C.; Jiang J.H.; Neelin J.D.; Yung Y.L.
Source Publication: Geophysical Research Letters
ISSN: 948276
Publishing Year: 2020
Volume: 47, Issue:3
Language: 英语
Keyword: ascent ; circulation ; drying ; ITCZ ; precipitation ; tightening
Scopus Keyword: 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
English Abstract: 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.
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Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/159258
Appears in Collections:气候变化与战略

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Affiliation: 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

Recommended Citation:
Su H.,Wu L.,Zhai C.,et al. Observed Tightening of Tropical Ascent in Recent Decades and Linkage to Regional Precipitation Changes[J]. Geophysical Research Letters,2020-01-01,47(3)
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