Wet season chemical composition of atmospheric wet deposition at Cape Point

Q3 Environmental Science

Clean Air Journal Pub Date : 2022-06-24 DOI:10.17159/caj/2022/32/1.12866

J. Swartz, P. V. van Zyl, J. Beukes, C. Galy-Lacaux, C. Labuschagne, E. Brunke, T. Mkololo, J. Pienaar

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Abstract

The measurement of precipitation chemistry enables the assessment of the temporal and spatial evolution of the chemical composition of the atmosphere associated with atmospheric physical and chemical mechanisms. The aims of this study were to report the chemical composition of rainwater collected at a marine environment, i.e. the Cape Point Global Atmosphere Watch (CPT GAW) station from 2004 to 2012. As expected, the volume weighted mean (VWM) concentrations of Na+ (298.64 μEq.L-1) and Cl- (354.18 μEq.L-1) were significantly higher compared to the VWM concentrations of other ionic species, as well as compared to the VWM concentrations thereof at the sites in the South African interior. The average pH of rainwater was slightly lower than the pH of unpolluted rainwater, mainly due to NO3- associated with the occasional influence of the Cape Town metropole. In contrast to the sites situated in the north-eastern South African interior, where anthropogenic SO42- was the major constituent in rainwater, SO42- at CPT GAW was entirely associated with marine air with no anthropogenic contribution. It was also indicated that 94% of the chemical content at CPT GAW can be attributed to the marine source.

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开普敦雨季大气湿沉降的化学成分

降水化学的测量能够评估与大气物理和化学机制相关的大气化学成分的时间和空间演变。本研究的目的是报告2004年至2012年在海洋环境（即海角全球大气观测站）收集的雨水的化学成分。正如预期的那样，Na+（298.64μEq.L-1）和Cl-（354.18μEq.L-2）的体积加权平均（VWM）浓度显著高于其他离子物种的VWM浓度，也高于南非内陆地区的VWM。雨水的平均pH值略低于未污染雨水的pH值，主要是由于NO3——与开普敦大都市的偶尔影响有关。与位于南非东北部内陆的地点不同，在那里，人为SO42-是雨水的主要成分，CPT GAW的SO42-完全与海洋空气有关，没有人为贡献。研究还表明，CPT GAW中94%的化学成分可归因于海洋来源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Clean Air Journal Environmental Science-Management, Monitoring, Policy and Law

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

8 weeks

期刊介绍： Clean Air Journal is the official publication of the National Association for Clean Air, a not-for-profit organisation. Clean Air Journal is a peer-reviewed journal for those interested in air quality, air quality management, and the impacts of air pollution relevant to Africa. The focus of the journal includes, but is not limited to: Impacts of human activities and natural processes on ambient air quality Air quality and climate change linkages Air pollution mitigation technologies and applications Matters of public policy regarding air quality management Measurement and analysis of ambient and indoor air pollution Atmospheric modelling application and development Atmospheric emissions Other topics on atmospheric physics or chemistry with particular relevance to Africa The scope of the journal is broad, but the core theme of the journal is air quality in Africa.