气候变化领域集成服务门户(CCPortal): Radiative heating rate profiles over the southeast Atlantic Ocean during the 2016 and 2017 biomass burning seasons

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DOI	10.5194/acp-20-10073-2020
	Radiative heating rate profiles over the southeast Atlantic Ocean during the 2016 and 2017 biomass burning seasons
	Collow A.B.M.; Miller M.A.; Trabachino L.C.; Jensen M.P.; Wang M.
发表日期	2020
ISSN	1680-7316
起始页码	10073
结束页码	10090
卷号	20 期号:16
英文摘要	Marine boundary layer clouds, including the transition from stratocumulus to cumulus, are poorly represented in numerical weather prediction and general circulation models. Further uncertainties in the cloud structure arise in the presence of biomass burning carbonaceous aerosol, as is the case over the southeast Atlantic Ocean, where biomass burning aerosol is transported from the African continent. As the aerosol plume progresses across the southeast Atlantic Ocean, radiative heating within the aerosol layer has the potential to alter the thermodynamic environment and therefore the cloud structure; however, limited work has been done to quantify this along the trajectory of the aerosol plume in the region. The deployment of the first Atmospheric Radiation Measurement (ARM) Mobile Facility (AMF1) in support of the Layered Atlantic Smoke Interactions with Clouds field campaign provided a unique opportunity to collect observations of cloud and aerosol properties during two consecutive biomass burning seasons during July through October of 2016 and 2017 over Ascension Island (7.96- S, 14.35- W). Using observed profiles of temperature, humidity, and clouds from the field campaign alongside aerosol optical properties from Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2), as input for the Rapid Radiation Transfer Model (RRTM), profiles of the radiative heating rate due to aerosols and clouds were computed. Radiative heating is also assessed across the southeast Atlantic Ocean using an ensemble of back trajectories from the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model. Idealized experiments using the RRTM with and without aerosols and a range of values for the single-scattering albedo (SSA) demonstrate that shortwave (SW) heating within the aerosol layer above Ascension Island can locally range between 2 and 8Kd-1 depending on the aerosol optical properties, though impacts of the aerosol can be felt elsewhere in the atmospheric column. When considered under clear conditions, the aerosol has a cooling effect at the TOA, and based on the observed cloud properties at Ascension Island, the cloud albedo is not large enough to overcome this. Shortwave radiative heating due to biomass burning aerosol is not balanced by additional longwave (LW) cooling, and the net radiative impact results in a stabilization of the lower troposphere. However, these results are extremely sensitive to the single-scattering albedo assumptions in models.. © 2020 Laser Institute of America. All rights reserved.
语种	英语
scopus关键词	aerosol composition; aerosol formation; biomass burning; boundary layer; cooling; heating; radiative forcing; trajectory; Atlantic Ocean
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247558
作者单位	Universities Space Research Association, Columbia, MD, United States; Global Modeling and Assimilation Office, Nasa Goddard Space Flight Center, Greenbelt, MD, United States; Department of Environmental Sciences, Rutgers University, New Brunswick, NJ, United States; Institute for Earth, Ocean and Atmospheric Sciences, Rutgers University, New Brunswick, NJ, United States; Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY, United States
推荐引用方式 GB/T 7714	Collow A.B.M.,Miller M.A.,Trabachino L.C.,et al. Radiative heating rate profiles over the southeast Atlantic Ocean during the 2016 and 2017 biomass burning seasons[J],2020,20(16).
APA	Collow A.B.M.,Miller M.A.,Trabachino L.C.,Jensen M.P.,&Wang M..(2020).Radiative heating rate profiles over the southeast Atlantic Ocean during the 2016 and 2017 biomass burning seasons.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(16).
MLA	Collow A.B.M.,et al."Radiative heating rate profiles over the southeast Atlantic Ocean during the 2016 and 2017 biomass burning seasons".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.16(2020).