Local emission of primary air pollutants and its contribution to wet deposition and concentrations of aerosols and gases in ambient air in?Japan

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• 作者：Masahide Aikawa ; Takatoshi Hiraki ; Nobutaka Tomoyose ; Tsuyoshi Ohizumi ; Izumi Noguchi ; Kentaro Murano ; Hitoshi Mukai
• 关键词：Emission ; Wet deposition ; Sulfate ; Nitrate ; Ammonium ; Japan Environmental Laboratories Association (JELA)
• 刊名：Atmospheric Environment
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：79
• 期：Complete
• 页码：317-323
• 全文大小：1118 K

文摘

We studied wet deposition by precipitation and the concentrations of aerosols and gases in ambient air in relation to the primary air pollutants discharged from domestic areas. The concentrations of aerosols and gases were influenced by nearby emissions except for non-sea-salt , which is transported long distances. The area facing the Sea of Japan showed much larger wet deposition than other areas, although the domestic emissions of the primary air pollutants there were small and showed a peak in wet deposition from October to March, as distinct from April to September in other areas. We performed the correlation analyses between wet deposition of each component and the product of the concentrations of corresponding aerosols and gases in ambient air and the two-thirds power of the precipitation. From the results, following scavenging processes were suggested. ? Sulfate and ammonium were scavenged in precipitation as particulate matter such as (NH₄)₂SO₄ and NH₄HSO_4. ? Nitrate was scavenged mainly in precipitation through gaseous HNO_3. ? Ammonium was complementarily scavenged in precipitation through aerosols such as (NH₄)₂SO₄ and NH₄HSO₄ and through gaseous NH₃.