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首页> 外文期刊>Environmental Science & Technology >Water-Soluble Brown Carbon in Atmospheric Aerosols from Godavari (Nepal), a Regional Representative of South Asia
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Water-Soluble Brown Carbon in Atmospheric Aerosols from Godavari (Nepal), a Regional Representative of South Asia

机译：南亚地区代表戈达瓦里（尼泊尔）的大气气溶胶中的水溶性棕碳

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摘要

Brown carbon (BrC) has recently emerged as an important light-absorbing aerosol. This study provides interannual and seasonal variations in light absorption properties, chemical composition, and sources of water-soluble BrC (WS-BrC) based on PM10 samples collected in Godavari, Nepal, from April 2012 to May 2014. The mass absorption efficiency of WS-BrC at 365 nm (MAE(365)) shows a clear seasonal variability, with the highest MAE(365) of 1.05 +/- 0.21 m(2) g(-1) in premonsoon season and the lowest in monsoon season (0.59 +/- 0.16 m(2) g(-1)). The higher MAE(365) values in nonmonsoon seasons are associated with fresh biomass burning emissions. This is further substantiated by a strong correlation (r = 0.79, P 0.01) between Abs(365) (light absorption coefficient at 365 nm) and levoglucosan. We found, using fluorescence techniques, that humic-like and protein-like substances are the main chromophores in WS-BrC and responsible for 80.2 +/- 4.1% and 19.8 +/- 4.1% of the total fluorescence intensity, respectively. BrC contributes to 8.78 +/- 3.74% of total light absorption over the 300-700 nm wavelength range. Considering the dominant contribution of biomass burning to BrC over Godavari, this study suggests that reduction in biomass burning emission may be a practical method for climate change mitigation in South Asia.
机译：褐碳（BrC）最近已成为一种重要的吸光气溶胶。这项研究基于2012年4月至2014年5月在尼泊尔Godavari采集的PM10样品，提供了光吸收特性，化学成分和水溶性BrC（WS-BrC）来源的年际和季节变化。WS的质量吸收效率-BrC在365 nm（MAE（365））表现出明显的季节性变化，在季风季节最高的MAE（365）为1.05 +/- 0.21 m（2）g（-1），季风季节的最低（0.59） +/- 0.16 m（2）g（-1））。非季风季节较高的MAE（365）值与新鲜的生物质燃烧排放有关。 Abs（365）（365 nm处的光吸收系数）与左旋葡聚糖之间具有很强的相关性（r = 0.79，P <0.01），这进一步证明了这一点。我们发现，使用荧光技术，腐殖质和蛋白质样物质是WS-BrC中的主要发色团，分别占总荧光强度的80.2 +/- 4.1％和19.8 +/- 4.1％。 BrC在300-700 nm波长范围内占总光吸收的8.78 +/- 3.74％。考虑到生物量燃烧对哥达瓦里地区BrC的主要贡献，这项研究表明减少生物量燃烧排放可能是缓解南亚气候变化的一种实用方法。

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  • 来源
    《Environmental Science & Technology》 |2019年第7期|3471-3479|共9页
  • 作者

    Wu Guangming; Ram Kirpa; Fu Pingqing; Wang Wan; Zhang Yanlin; Liu Xiaoyan; Stone Elizabeth A.; Pradhan Bidya Banmali; Dangol Pradeep Man; Panday Arnico K.; Wan Xin; Bai Zhipeng; Kang Shichang; Zhang Qianggong; Cong Zhiyuan;

  • 作者单位

    Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China;

    Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China|Banaras Hindu Univ, Inst Environm & Sustainable Dev, Varanasi 221005, Uttar Pradesh, India;

    Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China;

    Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China;

    Nanjing Univ Informat Sci & Technol, Yale NUIST Ctr Atmospher Environm, Nanjing 210044, Jiangsu, Peoples R China;

    Nanjing Univ Informat Sci & Technol, Yale NUIST Ctr Atmospher Environm, Nanjing 210044, Jiangsu, Peoples R China;

    Univ Iowa, Dept Chem, Iowa City, IA 52246 USA;

    Int Ctr Integrated Mt Dev, Khumaltar 009771, Lalitpur, Nepal;

    Int Ctr Integrated Mt Dev, Khumaltar 009771, Lalitpur, Nepal;

    Int Ctr Integrated Mt Dev, Khumaltar 009771, Lalitpur, Nepal;

    Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China;

    Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China|Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;

    Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China|Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;

    Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China|Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;

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