气候变化领域集成服务门户(CCPortal): Radiative Effects of Clouds and Water Vapor on an Axisymmetric Monsoon

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DOI	10.1175/JCLI-D-19-0974.1
	Radiative Effects of Clouds and Water Vapor on an Axisymmetric Monsoon
	Byrne M.P.; Zanna L.
发表日期	2020
ISSN	0894-8755
起始页码	8789
结束页码	8811
卷号	33 期号:20
英文摘要	Monsoons are summertime circulations shaping climates and societies across the tropics and subtropics. Here the radiative effects controlling an axisymmetric monsoon and its response to climate change are investigated using aquaplanet simulations. The influences of clouds, water vapor, and CO2 on the axisymmetric monsoon are decomposed using the radiation-locking technique. Seasonal variations in clouds and water vapor strongly modulate the axisymmetric monsoon, reducing net precipitation by approximately half. Warming and moistening of the axisymmetric monsoon by seasonal longwave cloud and water vapor effects are counteracted by a strong shortwave cloud effect. The shortwave cloud effect also expedites onset of the axisymmetric monsoon by approximately two weeks, whereas longwave cloud and water vapor effects delay onset. A conceptual model relates the timing of monsoon onset to the efficiency of surface cooling. In climate change simulations CO2 forcing and the water vapor feedback have similar influences on the axisymmetric monsoon, warming the surface and moistening the region. In contrast, clouds have a negligible effect on surface temperature yet dominate the monsoon circulation response. A new perspective for understanding how cloud radiative effects shape the monsoon circulation response to climate change is introduced. The radiation-locking simulations and analyses advance understanding of how radiative processes influence an axisymmetric monsoon, and establish a framework for interpreting monsoon-radiation coupling in observations, in state-of-the-art models, and in different climate states. ©2020 American Meteorological Society.
英文关键词	Atmospheric thermodynamics; Carbon dioxide; Climate models; Precipitation (meteorology); Tropics; Water vapor; Climate change simulations; Cloud radiative effects; Monsoon circulations; Radiation coupling; Seasonal variation; Surface temperatures; Water vapor effect; Water vapor feedbacks; Climate change; atmospheric moisture; carbon dioxide; cloud; monsoon; radiative forcing; seasonal variation; warming; water vapor
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171140
作者单位	University of St. Andrews, St. Andrews, United Kingdom; Courant Institute of Mathematical Sciences, New York University, New York City, NY, United States; University of Oxford, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Byrne M.P.,Zanna L.. Radiative Effects of Clouds and Water Vapor on an Axisymmetric Monsoon[J],2020,33(20).
APA	Byrne M.P.,&Zanna L..(2020).Radiative Effects of Clouds and Water Vapor on an Axisymmetric Monsoon.Journal of Climate,33(20).
MLA	Byrne M.P.,et al."Radiative Effects of Clouds and Water Vapor on an Axisymmetric Monsoon".Journal of Climate 33.20(2020).