气候变化领域集成服务门户(CCPortal): Glyoxal's impact on dry ammonium salts: Fast and reversible surface aerosol browning

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DOI	10.5194/acp-20-9581-2020
	Glyoxal's impact on dry ammonium salts: Fast and reversible surface aerosol browning
	O. De Haan D.; N. Hawkins L.; Jansen K.; G. Welsh H.; Pednekar R.; De Loera A.; G. Jimenez N.; A. Tolbert M.; Cazaunau M.; Gratien A.; Bergé A.; Pangui E.; Formenti P.; Doussin J.-F.
发表日期	2020
ISSN	1680-7316
起始页码	9581
结束页码	9590
卷号	20 期号:16
英文摘要	Alpha-dicarbonyl compounds are believed to form brown carbon in the atmosphere via reactions with ammonium sulfate (AS) in cloud droplets and aqueous aerosol particles. In this work, brown carbon formation in AS and other aerosol particles was quantified as a function of relative humidity (RH) during exposure to gas-phase glyoxal (GX) in chamber experiments. Under dry conditions(RH < 5 %), solid AS, AS glycine, and methylammonium sulfate (MeAS) aerosol particles brown within minutes upon exposure to GX, while sodium sulfate particles do not. When GX concentrations decline, browning goes away, demonstrating that this dry browning process is reversible. Declines in aerosol albedo are found to be a function of [GX]2 and are consistent between AS and AS glycine aerosol. Dry methylammonium sulfate aerosol browns 4 times more than dry AS aerosol, but deliquesced AS aerosol browns much less than dry AS aerosol. Optical measurements at 405, 450, and 530 nm provide an estimated Angstrom absorbance coefficient of 164. This coefficient and the empirical relationship between GX and albedo are used to estimate an upper limit to global radiative forcing by brown carbon formed by 70 ppt GX reacting with AS (C7:6105Wm2). This quantity is < 1% of the total radiative forcing by secondary brown carbon but occurs almost entirely in the ultraviolet range. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
英文关键词	aerosol; ammonium sulfate; brown carbon; cloud droplet; concentration (composition); particulate matter; relative humidity; salt
语种	英语
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/168963
作者单位	Department of Chemistry and Biochemistry, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, United States; Department of Chemistry, Harvey Mudd College, 301 Platt Blvd, Claremont, CA 91711, United States; Department of Chemistry, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, United States; Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR7583, Cnrs, Université Paris-Est Créteil (UPEC), Et Université de Paris, Institut Pierre Simon Laplace (IPSL), Créteil, France
推荐引用方式 GB/T 7714	O. De Haan D.,N. Hawkins L.,Jansen K.,et al. Glyoxal's impact on dry ammonium salts: Fast and reversible surface aerosol browning[J],2020,20(16).
APA	O. De Haan D..,N. Hawkins L..,Jansen K..,G. Welsh H..,Pednekar R..,...&Doussin J.-F..(2020).Glyoxal's impact on dry ammonium salts: Fast and reversible surface aerosol browning.Atmospheric Chemistry and Physics,20(16).
MLA	O. De Haan D.,et al."Glyoxal's impact on dry ammonium salts: Fast and reversible surface aerosol browning".Atmospheric Chemistry and Physics 20.16(2020).