气候变化领域集成服务门户(CCPortal): Investigating Carbonaceous Aerosol and Its Absorption Properties From Fires in the Western United States (WE-CAN) and Southern Africa (ORACLES and CLARIFY)

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DOI	10.1029/2021JD034984
	Investigating Carbonaceous Aerosol and Its Absorption Properties From Fires in the Western United States (WE-CAN) and Southern Africa (ORACLES and CLARIFY)
	Carter T.S.; Heald C.L.; Cappa C.D.; Kroll J.H.; Campos T.L.; Coe H.; Cotterell M.I.; Davies N.W.; Farmer D.K.; Fox C.; Garofalo L.A.; Hu L.; Langridge J.M.; Levin E.J.T.; Murphy S.M.; Pokhrel R.P.; Shen Y.; Szpek K.; Taylor J.W.; Wu H.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:15
英文摘要	Biomass burning (BB) produces large quantities of carbonaceous aerosol (black carbon and organic aerosol, BC and OA, respectively), which significantly degrade air quality and impact climate. BC absorbs radiation, warming the atmosphere, while OA typically scatters radiation, leading to cooling. However, some OA, termed brown carbon (BrC), also absorbs visible and near UV radiation; although, its properties are not well constrained. We explore three aircraft campaigns from important BB regions with different dominant fuel and fire types (Western Wildfire Experiment for Cloud Chemistry, Aerosol Absorption, and Nitrogen [WE-CAN] in the western United States and ObseRvations of Aerosols above CLouds and their intEractionS and Cloud-Aerosol-Radiation Interactions and Forcing for Year downwind of southern Africa) and compare them with simulations from the global chemical transport model, GEOS-Chem using GFED4s. The model generally captures the observed vertical profiles of carbonaceous BB aerosol concentrations; however, we find that BB BC emissions are underestimated in southern Africa. Our comparisons suggest that BC and/or BrC absorption is substantially higher downwind of Africa than in the western United States and, while the Saleh et al. (2014, https://doi.org/10.1038/ngeo2220) and FIREX parameterizations based on the BC:OA ratio improve model-observation agreement in some regions, they do not sufficiently differentiate absorption characteristics at short wavelengths. We find that photochemical whitening substantially decreases the burden and direct radiative effect of BrC (annual mean of +0.29 W m−2 without whitening and +0.08 W m−2 with). Our comparisons suggest that whitening is required to explain WE-CAN observations; however, the importance of whitening for African fires cannot be confirmed. Qualitative comparisons with the OMI UV aerosol index suggest our standard BrC whitening scheme may be too fast over Africa. © 2021. American Geophysical Union. All Rights Reserved.
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/237075
作者单位	Civil and Environmental Engineering Department, Massachusetts Institute of Technology, Cambridge, MA, United States; Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Civil and Environmental Engineering, University of California at Davis, Davis, CA, United States; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States; Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, United States; Department of Earth and Environmental Sciences, University of Manchester, Manchester, United Kingdom; School of Chemistry, University of Bristol, Bristol, United Kingdom; College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom; Met Office, Exeter, United Kingdom; Department of Chemistry, Colorado State University, Fort Collins, CO, United States; Department of Chemistry and Biochemistry, University of Montana, Missoula, ...
推荐引用方式 GB/T 7714	Carter T.S.,Heald C.L.,Cappa C.D.,et al. Investigating Carbonaceous Aerosol and Its Absorption Properties From Fires in the Western United States (WE-CAN) and Southern Africa (ORACLES and CLARIFY)[J],2021,126(15).
APA	Carter T.S..,Heald C.L..,Cappa C.D..,Kroll J.H..,Campos T.L..,...&Wu H..(2021).Investigating Carbonaceous Aerosol and Its Absorption Properties From Fires in the Western United States (WE-CAN) and Southern Africa (ORACLES and CLARIFY).Journal of Geophysical Research: Atmospheres,126(15).
MLA	Carter T.S.,et al."Investigating Carbonaceous Aerosol and Its Absorption Properties From Fires in the Western United States (WE-CAN) and Southern Africa (ORACLES and CLARIFY)".Journal of Geophysical Research: Atmospheres 126.15(2021).