Chemical composition of rainwater under two events of aerosol transport: A Saharan dust outbreak and wildfires.
作者： F Oduber , AI Calvo , A Castro , C Blanco-Alegre , C Alves
DOI: 10.1016/J.SCITOTENV.2020.139202
关键词:
摘要: Abstract A one-year campaign of joint sampling aerosols and precipitation, carried out in Leon, Spain, allowed to study the impact two special events that affected air quality north country, on rainfall city: a period with wildfires Saharan dust intrusion. The occurred northern Portugal northwestern Spain August 2016 chemistry 15 2016, causing an increase concentrations NH4+, Na+, Cl−, K+, Mg2+, Ca2+, SO42− NO3− organic acids, which was reflected levels soluble insoluble carbon. This led acidification rainwater (pH = 4.8). second precipitation event registered between 11 14 February 2017, during collected four daily fractions (P1, P2, P3 P4). rain sample 12 (P2) coincided intrusion reached Iberia day. chemical composition P2 showed Ca2+ (>800%), Mg2+ (71%), Cl− (62%), (33%) concentrations, respect P1. input crustal elements atmosphere helped neutralize rainwater, pH values higher than 6.5. Once left Peninsula, P4 revealed mixture marine contribution local anthropogenic emissions, as well decrease ion conductivity, values.
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