气候变化领域集成服务门户(CCPortal): Understanding the Response of Tropical Ascent to Warming Using an Energy Balance Framework

CCPortal

DOI	10.1029/2020MS002056
	Understanding the Response of Tropical Ascent to Warming Using an Energy Balance Framework
	Jenney A.M.; Randall D.A.; Branson M.D.
发表日期	2020
ISSN	19422466
卷号	12 期号:6
英文摘要	Previous work has established that warming is associated with an increase in dry static stability, a weakening of the tropical circulation, and a decrease in the convective mass flux. Using a set of idealized simulations with specified surface warming and superparameterized convection, we find support for these previous conclusions. We use an energy and mass balance framework to develop a simple diagnostic that links the fractional area covered by the region of upward motion to the strength of the mean circulation. We demonstrate that the diagnostic works well for our idealized simulations and use it to understand how changes in tropical ascent area and the strength of the mean circulation relate to changes in heating in the ascending and descending regions. We show that the decrease in the strength of the mean circulation can be explained by the relatively slow rate at which atmospheric radiative cooling intensifies with warming. In our simulations, decreases in tropical ascent area are balanced by increases in nonradiative heating in convective regions. Consistent with previous work, we find a warming-induced decrease in the mean convective mass flux. However, when we condition by the sign of the mean vertical motion, the warming-induced changes in the convective mass flux are nonmonotonic and opposite between the ascending and descending regions. ©2020. The Authors.
英文关键词	ascent area; climate change; convective mass flux; superparameterization; tropical circulation; weak temperature gradient approximation
语种	英语
scopus关键词	Radiative Cooling; Convective mass flux; Fractional area; Non-radiative; Nonmonotonic; Static stability; Surface warming; Upward motion; Vertical motions; Tropics; circulation; convection; mass balance; mass transfer; radiative transfer; simulation; tropical region; warming
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156704
作者单位	Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
推荐引用方式 GB/T 7714	Jenney A.M.,Randall D.A.,Branson M.D.. Understanding the Response of Tropical Ascent to Warming Using an Energy Balance Framework[J],2020,12(6).
APA	Jenney A.M.,Randall D.A.,&Branson M.D..(2020).Understanding the Response of Tropical Ascent to Warming Using an Energy Balance Framework.Journal of Advances in Modeling Earth Systems,12(6).
MLA	Jenney A.M.,et al."Understanding the Response of Tropical Ascent to Warming Using an Energy Balance Framework".Journal of Advances in Modeling Earth Systems 12.6(2020).