气候变化领域集成服务门户(CCPortal): Tropical Anvil Clouds: Radiative Driving Toward a Preferred State

CCPortal

DOI	10.1029/2020JD033107
	Tropical Anvil Clouds: Radiative Driving Toward a Preferred State
	Sokol A.B.; Hartmann D.L.
发表日期	2020
ISSN	2169897X
卷号	125 期号:21
英文摘要	The evolution of anvil clouds detrained from deep convective systems has important implications for the tropical energy balance and is thought to be shaped by radiative heating. We use combined radar-lidar observations and a radiative transfer model to investigate the influence of radiative heating on anvil cloud altitude, thickness, and microphysical structure. We find that high clouds with an optical depth between 1 and 2 are prevalent in tropical convective regions and can persist far from any convective source. These clouds are generally located at higher altitudes than optically thicker clouds, experience strong radiative heating, and contain high concentrations of ice crystals indicative of turbulence. These findings support the hypothesis that anvil clouds are driven toward and maintained at a preferred optical thickness that corresponds to a positive cloud radiative effect. Comparison of daytime and nighttime observations suggests that anvil thinning proceeds more rapidly at night, when net radiative cooling promotes the sinking of cloud top. It is hypothesized that the properties of aged anvil clouds and their susceptibility to radiative destabilization are shaped by the time of day at which the cloud was detrained. These results underscore the importance of small-scale processes in determining the radiative effect of tropical convection. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	A-train; anvil clouds; cirrus clouds; climate; cloud radiative effects; tropical convection
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185679
作者单位	Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Sokol A.B.,Hartmann D.L.. Tropical Anvil Clouds: Radiative Driving Toward a Preferred State[J],2020,125(21).
APA	Sokol A.B.,&Hartmann D.L..(2020).Tropical Anvil Clouds: Radiative Driving Toward a Preferred State.Journal of Geophysical Research: Atmospheres,125(21).
MLA	Sokol A.B.,et al."Tropical Anvil Clouds: Radiative Driving Toward a Preferred State".Journal of Geophysical Research: Atmospheres 125.21(2020).