气候变化领域集成服务门户(CCPortal): Eddy activity response to global warming

CCPortal

DOI	10.1175/JCLI-D-19-0190.1
	Eddy activity response to global warming–like temperature changes
	Yuval J.; Kaspi Y.
发表日期	2020
ISSN	0894-8755
起始页码	1381
结束页码	1404
卷号	33 期号:4
英文摘要	Global warming projections show an anomalous temperature increase both at the Arctic surface and at lower latitudes in the upper troposphere. The Arctic amplification decreases the meridional temperature gradient, and simultaneously decreases static stability. These changes in the meridional temperature gradient and in the static stability have opposing effects on baroclinicity. The temperature increase at the upper tropospheric lower latitudes tends to increase the meridional temperature gradient and simultaneously increase static stability, which have opposing effects on baroclinicity as well. In this study, a dry idealized general circulation model with a modified Newtonian cooling scheme, which allows any chosen zonally symmetric temperature distribution to be simulated, is used to study the effect of Arctic amplification and lower-latitude upper-level warming on eddy activity. Due to the interplay between the static stability and meridional temperature gradient on atmospheric baroclinicity changes, and their opposing effect on atmospheric baroclinicity, it is found that both the Arctic amplification and lower-latitude upper-level warming could potentially lead to both decreases and increases in eddy activity, depending on the exact prescribed temperature modifications. Therefore, to understand the effect of global warming–like temperature trends on eddy activity, the zonally symmetric global warming temperature projections from state-of-the-art models are simulated. It is found that the eddy kinetic energy changes are dominated by the lower-latitude upper-level warming, which tends to weaken the eddy kinetic energy due to increased static stability. On the other hand, the eddy heat flux changes are dominated by the Arctic amplification, which tends to weaken the eddy heat flux at the lower levels. Ó 2020 American Meteorological Society.
英文关键词	Global warming; Heat flux; Kinetic energy; Kinetics; Stability; Thermal gradients; Troposphere; American meteorological societies; Atmospheric baroclinicity; Eddy kinetic energy; General circulation model; Meridional temperature gradient; Temperature changes; Temperature increase; Temperature projection; Atmospheric temperature; air temperature; amplification; atmospheric general circulation model; baroclinic mode; eddy; global warming; temperature gradient; troposphere; Arctic
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/171449
作者单位	Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel
推荐引用方式 GB/T 7714	Yuval J.,Kaspi Y.. Eddy activity response to global warming–like temperature changes[J],2020,33(4).
APA	Yuval J.,&Kaspi Y..(2020).Eddy activity response to global warming–like temperature changes.Journal of Climate,33(4).
MLA	Yuval J.,et al."Eddy activity response to global warming–like temperature changes".Journal of Climate 33.4(2020).