气候变化领域集成服务门户(CCPortal): Feedbacks and eddy diffusivity in an energy balance model of tropical rainfall shifts

CCPortal

DOI	10.1038/s41612-020-0114-4
	Feedbacks and eddy diffusivity in an energy balance model of tropical rainfall shifts
	Peterson H.G.; Boos W.R.
发表日期	2020
ISSN	23973722
卷号	3 期号:1
英文摘要	Radiative feedbacks are known to strongly modify horizontal shifts of the intertropical convergence zone (ITCZ) produced by remote atmospheric energy sources. This study uses a one-dimensional moist energy balance model to understand how radiative feedbacks and the structure of an imposed eddy diffusivity can influence such ITCZ shifts. The Planck feedback is shown to damp ITCZ shifts more strongly for extratropical forcings than for tropical ones, because lower moisture content in cold regions makes the temperature response larger there. The water vapor feedback on ITCZ shifts is shown to be dominated by changes in the cross-equatorial asymmetry of the relative humidity of subtropical dry zones, with additional contributions by the changes in mixing ratio that occur at fixed relative humidity and by the meridional shift of the humid ITCZ. Finally, the ITCZ response is found to be highly sensitive to the meridional structure of the diffusivity; the ITCZ shift increases with the tropical diffusivity, even when the global mean diffusivity is fixed. © 2020, The Author(s).
语种	英语
scopus关键词	cold region; eddy; energy balance; extratropical cyclone; intertropical convergence zone; mixing ratio; moisture content; radiative forcing; rainfall; relative humidity
来源期刊	npj Climate and Atmospheric Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178061
作者单位	Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA, United States; Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Peterson H.G.,Boos W.R.. Feedbacks and eddy diffusivity in an energy balance model of tropical rainfall shifts[J],2020,3(1).
APA	Peterson H.G.,&Boos W.R..(2020).Feedbacks and eddy diffusivity in an energy balance model of tropical rainfall shifts.npj Climate and Atmospheric Science,3(1).
MLA	Peterson H.G.,et al."Feedbacks and eddy diffusivity in an energy balance model of tropical rainfall shifts".npj Climate and Atmospheric Science 3.1(2020).