globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2019.117250
论文题名:
Impacts of some co-dissolved inorganics on in-cloud photochemistry of aqueous brown carbon
作者: Ray D.; Ghosh S.K.; Raha S.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 223
语种: 英语
英文关键词: Aerosols ; Bleaching ; Carbon ; Chlorine compounds ; Cleaning ; Image processing ; Precipitation (meteorology) ; Solar energy ; Sulfur compounds ; Aerosol-cloud interaction ; Biomass-burning ; Brown carbons ; Fluorescence quantum yield ; Irradiation time ; Mass absorption coefficient ; Organic species ; Water evaporation ; Bromine compounds ; carbon ; chloride ; ion ; nitrate ; sulfate ; absorption coefficient ; aerosol ; aqueous solution ; biomass burning ; brown carbon ; experimental study ; photochemistry ; precipitation (chemistry) ; reaction kinetics ; volcanic cloud ; absorption ; aerosol ; aqueous solution ; bleaching ; cloud ; evaporation ; fluorescence ; Fourier transform infrared spectroscopy ; heating ; ion chromatography ; irradiation ; light absorption ; particulate matter ; photochemistry ; precipitation ; priority journal ; quantum yield ; solar energy ; spectrofluorometry
学科: Aerosol-cloud interaction ; Biomass burning ; brown carbon ; Photo-bleaching kinetics
中文摘要: This experimental study explored the impacts of some codissolved inorganic ions (in particular, sulfate, nitrate and chloride) on the photo-bleaching kinetics of the aqueous solutions of brown carbon (BrC) extracted from rice-straw smoldering aerosol. All the aqueous BrC solutions showed two distinct phases of decreasing mass absorption coefficient (MAC) with irradiation time, where the first phase (0–1h) was 2.4–5.3 times faster than the second phase (1–3h). Interestingly, the photo-bleaching process was slowed down for both phases when SO42− (0–1h: 0.196±0.02 h−1; 1–3h: 0.045±0.01 h−1), NO3− (0–1h: 0.158±0.004 h−1; 1–3h: 0.066±0.007 h−1) and Cl− (0–1h: 0.169±0.007 h−1; 1–3h: 0.032±0.006 h−1) salt solutions were added separately to the BrC extracts (0–1h: 0.27±0.04 h−1; 1–3h: 0.067±0.01 h−1). Alternatively, the corresponding lifetimes of the light-absorbing organic species were enhanced in the salt-added BrC solutions. In addition, the magnitudes of the fluorescence quantum yields were measured to be of the order of 10−3−10−2, implying that most of the absorbed solar energy would convert into heat rather than fluorescing back into the atmosphere. The findings of this study are suggestive of possible increase in heating of BrC containing atmospheric aqueous bodies like cloud-water, resulting in water evaporation and hence reduced precipitation (semi-direct effect). © 2019 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160987
Appears in Collections:气候变化与战略

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作者单位: Environmental Sciences Section, Bose Institute, P 1/12 CIT Scheme VII-M, Kolkata, 700054, India; Department of Physics, Bose Institute, 93/1, A.P.C Road, Kolkata, 700009, India; Centre for Astroparticle Physics and Space Science, Block-EN, Sector-V, Salt Lake, Kolkata, 700091, India

Recommended Citation:
Ray D.,Ghosh S.K.,Raha S.. Impacts of some co-dissolved inorganics on in-cloud photochemistry of aqueous brown carbon[J]. Atmospheric Environment,2020-01-01,223
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