GSTDTAP  > 气候变化
DOI10.1029/2019JD031209
The Influence of Elevated Smoke Layers on Stratocumulus Clouds Over the SE Atlantic in the NASA Goddard Earth Observing System (GEOS) Model
Das, Sampa1,2; Colarco, Peter R.2; Harshvardhan, H.3
2020-03-27
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2020
卷号125期号:6
文章类型Article
语种英语
国家USA
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 similar to 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 similar to 33% for shallow marine boundary layers (MBL) and a decrease by similar to 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.


英文关键词Biomass Burning Aerosols Stratocumulus Clouds South-East Atlantic Global Model
领域气候变化
收录类别SCI-E
WOS记录号WOS:000529111600016
WOS关键词SOUTHEAST ATLANTIC ; BOUNDARY-LAYER ; ABSORBING AEROSOLS ; OPTICAL DEPTH ; CLIMATE ; SATELLITE ; IMPACT ; MODIS ; ABSORPTION ; CONVECTION
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/280157
专题气候变化
作者单位1.Univ Space Res Assoc, Columbia, MD 21046 USA;
2.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;
3.Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA
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Das, Sampa,Colarco, Peter 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]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2020,125(6).
APA Das, Sampa,Colarco, Peter 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, Sampa,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).
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