气候变化领域集成服务门户(CCPortal): Ambient aerosol properties in the remote atmosphere from global-scale in situ measurements

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DOI	10.5194/acp-21-15023-2021
	Ambient aerosol properties in the remote atmosphere from global-scale in situ measurements
	Brock C.A.; Froyd K.D.; Dollner M.; Williamson C.J.; Schill G.; Murphy D.M.; Wagner N.J.; Kupc A.; Jimenez J.L.; Campuzano-Jost P.; Nault B.A.; Schroder J.C.; Day D.A.; Price D.J.; Weinzierl B.; Schwarz J.P.; Katich J.M.; Wang S.; Zeng L.; Weber R.; DIbb J.; Scheuer E.; DIskin G.S.; DIgangi J.P.; Bui T.; Dean-Day J.M.; Thompson C.R.; Peischl J.; Ryerson T.B.; Bourgeois I.; Daube B.C.; Commane R.; Wofsy S.C.
发表日期	2021
ISSN	1680-7316
起始页码	15023
结束页码	15063
卷号	21 期号:19
英文摘要	In situ measurements of aerosol microphysical, chemical, and optical properties were made during global-scale flights from 2016-2018 as part of the Atmospheric Tomography Mission (ATom). The NASA DC-8 aircraft flew from 1/484 to 1/486 latitude over the Pacific, Atlantic, Arctic, and Southern oceans while profiling nearly continuously between altitudes of 1/4160m and 1/412km. These global circuits were made once each season. Particle size distributions measured in the aircraft cabin at dry conditions and with an underwing probe at ambient conditions were combined with bulk and single-particle composition observations and measurements of water vapor, pressure, and temperature to estimate aerosol hygroscopicity and hygroscopic growth factors and calculate size distributions at ambient relative humidity. These reconstructed, composition-resolved ambient size distributions were used to estimate intensive and extensive aerosol properties, including single-scatter albedo, the asymmetry parameter, extinction, absorption, Ångström exponents, and aerosol optical depth (AOD) at several wavelengths, as well as cloud condensation nuclei (CCN) concentrations at fixed supersaturations and lognormal fits to four modes. Dry extinction and absorption were compared with direct in situ measurements, and AOD derived from the extinction profiles was compared with remotely sensed AOD measurements from the ground-based Aerosol Robotic Network (AERONET); this comparison showed no substantial bias. The purpose of this work is to describe the methodology by which ambient aerosol properties are estimated from the in situ measurements, provide statistical descriptions of the aerosol characteristics of different remote air mass types, examine the contributions to AOD from different aerosol types in different air masses, and provide an entry point to the ATom aerosol database. The contributions of different aerosol types (dust, sea salt, biomass burning, etc.) to AOD generally align with expectations based on location of the profiles relative to continental sources of aerosols, with sea salt and aerosol water dominating the column extinction in most remote environments and dust and biomass burning (BB) particles contributing substantially to AOD, especially downwind of the African continent. Contributions of dust and BB aerosols to AOD were also significant in the free troposphere over the North Pacific. Comparisons of lognormally fitted size distribution parameters to values in the Optical Properties of Aerosols and Clouds (OPAC) database commonly used in global models show significant differences in the mean diameters and standard deviations for accumulation-mode particles and coarse-mode dust. In contrast, comparisons of lognormal parameters derived from the ATom data with previously published shipborne measurements in the remote marine boundary layer show general agreement. The dataset resulting from this work can be used to improve global-scale representation of climate-relevant aerosol properties in remote air masses through comparison with output from global models and assumptions used in retrievals of aerosol properties from both ground-based and satellite remote sensing. © 2021 The Author(s).
语种	英语
scopus关键词	aerosol property; air mass; cloud condensation nucleus; in situ measurement; optical depth; particle size; relative humidity; size distribution; Arctic Ocean; Atlantic Ocean; Pacific Ocean; Southern 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/246524
作者单位	Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, United States; Faculty of Physics, Aerosol Physics and Environmental Physics, University of Vienna, Vienna, 1090, Austria; Department of Chemistry, University of Colorado, Boulder, CO 80309, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States; Earth Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824, United States; Langley Research Center, National Aeronautics and Space Administration, Hampton, VA 23681, United States; Ames Research Center, National Aeronautics and Space Administration, Moffett Field, CA 94035, United States; Bay Area Environment Research Institute, Moffett Field, CA 94035, United States; Department of Earth and Planetary Sci...
推荐引用方式 GB/T 7714	Brock C.A.,Froyd K.D.,Dollner M.,et al. Ambient aerosol properties in the remote atmosphere from global-scale in situ measurements[J],2021,21(19).
APA	Brock C.A..,Froyd K.D..,Dollner M..,Williamson C.J..,Schill G..,...&Wofsy S.C..(2021).Ambient aerosol properties in the remote atmosphere from global-scale in situ measurements.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(19).
MLA	Brock C.A.,et al."Ambient aerosol properties in the remote atmosphere from global-scale in situ measurements".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.19(2021).