气候变化领域集成服务门户(CCPortal): The role of tropical; midlatitude; and polar cloud-radiative changes for the midlatitude circulation response to global warming

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DOI	10.1175/JCLI-D-20-0073.1
	The role of tropical; midlatitude; and polar cloud-radiative changes for the midlatitude circulation response to global warming
	Albern N.; Voigt A.; Thompson D.W.J.; Pinto J.G.
发表日期	2020
ISSN	0894-8755
起始页码	7927
结束页码	7943
卷号	33 期号:18
英文摘要	Previous studies showed that global cloud-radiative changes contribute half or more to the midlatitude atmospheric circulation response to global warming. Here, we investigate the relative importance of tropical, midlatitude, and polar cloud-radiative changes for the annual-mean, wintertime, and summertime circulation response across regions in AMIP-like simulations. To this end, we study global warming simulations from the ICON model run with the cloud-locking method and prescribed sea surface temperatures, which isolate the impact of changes in atmospheric cloud-radiative heating. Tropical cloud changes dominate the global cloud impact on the 850 hPa zonal wind, jet strength, and storm track responses across most seasons and regions. For the jet shift, a more diverse picture is found. In the annual mean and DJF, tropical and midlatitude cloud changes contribute substantially to the poleward jet shift in all regions. The poleward jet shift is further supported by polar cloud changes across the Northern Hemisphere but not in the Southern Hemisphere. In JJA, the impact of regional cloud changes on the jet position is small, consistent with an overall small jet shift during this season. The jet shift can be largely understood via the anomalous atmospheric cloud-radiative heating in the tropical and midlatitude upper troposphere. The circulation changes are broadly consistent with the influence of cloud-radiative changes on upper-tropospheric baroclinicity and thus the mean potential energy available for conversion into eddy kinetic energy. Our results help to explain the jet response to global warming and highlight the importance of tropical and midlatitude cloud-radiative changes for this response. © 2020 American Meteorological Society.
英文关键词	Global warming; Heat radiation; Kinetic energy; Kinetics; Oceanography; Potential energy; Radiant heating; Surface waters; Troposphere; Atmospheric circulation; Circulation changes; Eddy kinetic energy; Impact of changes; Mid-latitude clouds; Northern Hemispheres; Sea surface temperature (SST); Southern Hemisphere; Tropics; atmospheric circulation; baroclinic mode; climate change; climate effect; cloud microphysics; cloud radiative forcing; global warming; jet flow; midlatitude environment; polar region; storm track; summer; tropical region; troposphere; winter; zonal wind
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/171126
作者单位	Institute of Meteorology and, Climate Research, Department Troposphere Research, Karlsruhe Institute of Technology, Karlsruhe, Germany; Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
推荐引用方式 GB/T 7714	Albern N.,Voigt A.,Thompson D.W.J.,et al. The role of tropical; midlatitude; and polar cloud-radiative changes for the midlatitude circulation response to global warming[J],2020,33(18).
APA	Albern N.,Voigt A.,Thompson D.W.J.,&Pinto J.G..(2020).The role of tropical; midlatitude; and polar cloud-radiative changes for the midlatitude circulation response to global warming.Journal of Climate,33(18).
MLA	Albern N.,et al."The role of tropical; midlatitude; and polar cloud-radiative changes for the midlatitude circulation response to global warming".Journal of Climate 33.18(2020).