气候变化领域集成服务门户(CCPortal): The Influence of Elevated Smoke Layers on Stratocumulus Clouds Over the SE Atlantic in the NASA Goddard Earth Observing System (GEOS) Model

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DOI	10.1029/2019JD031209
	The Influence of Elevated Smoke Layers on Stratocumulus Clouds Over the SE Atlantic in the NASA Goddard Earth Observing System (GEOS) Model
	Das S.; Colarco P.R.; Harshvardhan H.
发表日期	2020
ISSN	2169897X
卷号	125 期号:6
英文摘要	Previous evaluations of simulated aerosol transport over the south-east Atlantic by global aerosol models, including the Goddard Earth Observing System (GEOS) atmospheric general circulation model, showed that the bulk of the modeled smoke aerosol layer resided ~1–2 km lower than Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) lidar observations. Using this finding as the motivation, this study examines the changes in model-simulated cloud properties in response to redistributing the vertical placement of the aerosol over the ocean. Ten years (2006–2015) of CALIOP-retrieved smoke aerosol extinction profiles were used to redistribute the model-simulated aerosol mass on a monthly mean basis, keeping the column aerosol mass conserved. The results from the model sensitivity experiments show that elevating the aerosol layer to higher levels in agreement with CALIOP observations causes an increase in cloud fractions by ~33% for shallow marine boundary layers (MBL) and a decrease by ~30% for deeper MBL. For a shallow MBL, aerosol-induced warming within the cloud layers for the lower altitude aerosol case decreases relative humidity at these levels and leads to a reduction of overall cloud amount compared to the elevated aerosol case. For a deeper MBL, however, aerosol heating within the upper cloud levels in the lower altitude aerosol case increases the underlying MBL stability, which suppresses the cloud vertical extent, enhances cloud cover, and delays the stratocumulus to cumulus transition. Finally, aerosol redistribution impacts on radiative forcing are investigated, which appear to be mainly driven by the changes in cloud area fractions rather than in-cloud liquid water path changes between the model experiments. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Biomass Burning Aerosols; Global Model; South-East Atlantic; Stratocumulus Clouds
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/186096
作者单位	Universities Space Research Association, Columbia, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Department of Earth Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN, United States
推荐引用方式 GB/T 7714	Das S.,Colarco P.R.,Harshvardhan H.. The Influence of Elevated Smoke Layers on Stratocumulus Clouds Over the SE Atlantic in the NASA Goddard Earth Observing System (GEOS) Model[J],2020,125(6).
APA	Das S.,Colarco P.R.,&Harshvardhan H..(2020).The Influence of Elevated Smoke Layers on Stratocumulus Clouds Over the SE Atlantic in the NASA Goddard Earth Observing System (GEOS) Model.Journal of Geophysical Research: Atmospheres,125(6).
MLA	Das S.,et al."The Influence of Elevated Smoke Layers on Stratocumulus Clouds Over the SE Atlantic in the NASA Goddard Earth Observing System (GEOS) Model".Journal of Geophysical Research: Atmospheres 125.6(2020).