Glyoxal's impact on dry ammonium salts: fast and reversible surface aerosol browning

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) durin...

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Veröffentlicht in:	Atmospheric chemistry and physics 2020-08, Vol.20 (16), p.9581-9590
Hauptverfasser:	De Haan, David O, Hawkins, Lelia N, Jansen, Kevin, Welsh, Hannah G, Pednekar, Raunak, de Loera, Alexia, Jimenez, Natalie G, Tolbert, Margaret A, Cazaunau, Mathieu, Gratien, Aline, Bergé, Antonin, Pangui, Edouard, Formenti, Paola, Doussin, Jean-François
Format:	Artikel
Sprache:	eng
Schlagworte:	Aerosol particles Aerosols Albedo Albedo (solar) Ammonia Ammonium Ammonium compounds Ammonium salts Ammonium sulfate Atmospheric aerosols Browning Carbon Carbonyl compounds Cloud droplets Clouds Continental interfaces, environment Environmental Sciences Experiments Exposure Glycine Glycine (amino acid) Glyoxal Humidity Optical measurement Particulates Radiative forcing Relative humidity Salts Sciences of the Universe Scientific imaging Sodium Sodium sulfate Stainless steel Sulfate particles Sulfates
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Zusammenfassung:	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
ISSN:	1680-7324 1680-7316 1680-7324
DOI:	10.5194/acp-20-9581-2020