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首页> 外文期刊>The Science of the Total Environment >Chemical composition of rainwater under two events of aerosol transport: A Saharan dust outbreak and wildfires
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Chemical composition of rainwater under two events of aerosol transport: A Saharan dust outbreak and wildfires

机译：气雾运输两种事件下雨水的化学成分：撒哈拉尘埃爆发和野火

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摘要

A one-year campaign of joint sampling of aerosols and precipitation, carried out in Leon, Spain, allowed to study the impact of two special events that affected the air quality in the north of the country, on rainfall in the city: a period with wildfires and a Saharan dust intrusion. The wildfires that occurred in northern Portugal and northwestern Spain in August 2016 affected the chemistry of rainfall on 15 August 2016, causing an increase in concentrations of NH_4~+, Na~+, Cl~-, K~+, Mg~(2+), Ca~(2+), SO_4~(2-) and NO_3~- and in the concentrations of organic acids, which was reflected in the levels of soluble and insoluble organic carbon. This led to acidification of rainwater (pH = 4.8). The second precipitation event was registered between 11 and 14 February 2017, during which the rainwater was collected in four daily fractions (P_1, P_2, P_3 and P_4). The rain sample of 12 February (P_2) coincided with a Saharan dust intrusion that reached northern Iberia that day. The chemical composition of P_2 showed an increase in the Ca~(2+) (＞800%), Mg~(2+) (71%), Cl~- (62%), and SO_4~(2-) (33%) concentrations, with respect to P_1. The input of crustal elements to the atmosphere helped to neutralize the P_2 rainwater, causing pH values higher than 6.5. Once the dust intrusion left the north of the Peninsula, the composition of rainwater P_3 and P_4 revealed a mixture of marine contribution with local anthropogenic emissions, as well as a decrease in ion concentrations and conductivity, and an increase in pH values.
机译：在西班牙莱昂进行的气溶胶和降水的一个一年的联合抽样活动，允许研究两个特殊活动的影响，这些事件影响了该国北部的空气质量，降雨量：一段时间野火和撒哈拉粉尘侵入。 2016年8月15日葡萄牙北部和西北西班牙西班牙西班牙的野火影响了2016年8月15日的降雨化学，导致NH_4〜+，Na〜+，Cl〜 - ，K〜+，Mg〜（2+ ），Ca〜（2+），SO_4〜（2-）和NO_3〜 - 以及浓度的有机酸，其反映在可溶性和不溶性有机碳的水平中。这导致雨水的酸化（pH = 4.8）。第二次降水事件于2017年2月11日至14日之间注册，在此期间，雨水在四个每日馏分（P_1，P_2，P_3和P_4）中收集。 2月12日（P_2）的雨水样本恰逢撒哈拉粉尘入侵，当天达到伊比利亚北部。 P_2的化学成分显示Ca〜（2+）（> 800％），Mg〜（2+）（71％），Cl〜 - （62％），SO_4〜（2-）增加（33 ％）浓度相对于P_1。地壳元素对大气的输入有助于中和P_2雨水，导致pH值高于6.5。一旦灰尘侵入留在半岛北部，雨水P_3和P_4的组成揭示了海洋贡献与局部人为发射的混合物，以及离子浓度和导电性的降低，以及pH值的增加。

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  • 来源
    《The Science of the Total Environment》 |2020年第10期|139202.1-139202.11|共11页
  • 作者

    F. Oduber; A.I. Calvo; A. Castro; C. Blanco-Alegre; C. Alves; J. Barata; T. Nunes; F. Lucarelli; S. Nava; G. Calzolai; M. Cerqueira; J. Martin-Villacorta; V. Esteves; R. Fraile;

  • 作者单位

    Department of Physics IMARENAB University of Leon Leon Spain;

    Department of Physics IMARENAB University of Leon Leon Spain;

    Department of Physics IMARENAB University of Leon Leon Spain;

    Department of Physics IMARENAB University of Leon Leon Spain;

    Department of Environmental and Planning CESAM University of Aveiro Aveiro Portugal;

    Department of Environmental and Planning CESAM University of Aveiro Aveiro Portugal;

    Department of Environmental and Planning CESAM University of Aveiro Aveiro Portugal;

    Department of Physics and Astronomy University of Florence and INFN-Florence Florence Italy;

    Department of Physics and Astronomy University of Florence and INFN-Florence Florence Italy;

    Department of Physics and Astronomy University of Florence and INFN-Florence Florence Italy;

    Department of Environmental and Planning CESAM University of Aveiro Aveiro Portugal;

    Department of Physics IMARENAB University of Leon Leon Spain;

    Department of Environmental and Planning CESAM University of Aveiro Aveiro Portugal;

    Department of Physics IMARENAB University of Leon Leon Spain;

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  • 正文语种 eng
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  • 关键词

    Aerosol; Dust intrusion; Precipitation; Wildfires;

    机译：气雾剂;粉尘侵入;沉淀;野火;

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