Spatial and temporal variations of chemicals in the TSP aerosols simultaneously collected at three islands in Okinawa, Japan
Spatial and temporal variations of chemicals in the TSP aerosols simultaneously collected at three islands in Okinawa, Japan
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DOI：
10.1016/j.atmosenv.2014.04.040
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发表时间：
2014-11-01
影响因子：
5
通讯作者：
Wang, Hongyan
中科院分区：
文献类型：
--
作者：
Arakaki, Takemitsu;Azechi, Sotaro;Wang, Hongyan
东亚经济的快速增长引发了人们对空气污染物排放的担忧。我们在亚洲沙尘季节期间在东亚下风的日本冲绳的三个岛屿同时采集了总悬浮颗粒（TSP）气溶胶样本，以研究气溶胶中主要化学物质的时空变化和化学转化。 2008 年 7 月至 2010 年 6 月期间每周收集样品，并测定水溶性阳离子、阴离子和有机碳 (WSOC) 的浓度 (n = 303)。空间分布分析表明，春季（亚洲沙尘季节）非海盐（nss）-SO42-的月平均浓度随着距亚洲距离的增加而降低，而NO3-的趋势不太明显，表明化学转化影响了某些化学物质的远距离迁移。时间变化分析表明，春季nss-SO42-、NO3-和WSOC浓度分别约为夏季（来自太平洋的清洁气团）的2.0、2.4和1.8倍。这项研究表明，空气污染物从亚洲大陆输送到冲绳群岛，影响了该地区的空气质量。这也可能对生态系统产生影响，因为颗粒物 NO3- 浓度的增加可能会增加冲绳群岛周围的营养水平。 (C) 2014 Elsevier Ltd. 保留所有权利。
East Asia's rapid economic growth has led to concerns about the emission of air pollutants. We collected total suspended particle (TSP) aerosol samples simultaneously at three islands in Okinawa, Japan, which are downwind of East Asia, during the Asian dust season, to examine the spatial and temporal variations and chemical transformations of major chemicals in the aerosols. Weekly samples were collected from July 2008 to June 2010, and the concentrations of water-soluble cations, anions, and organic carbon (WSOC) were determined (n = 303). Spatial distribution analysis showed that monthly mean concentrations of non-sea-salt (nss)-SO42- in the spring (Asian dust season) decreased with increasing distance from Asia, while the trend for NO3- was less evident, suggesting that chemical transformation affected the long-range transport of certain chemicals. Temporal variation analysis showed that concentrations of nss-SO42-, NO3-, and WSOC during the spring were about 2.0, 2.4, and 1.8 times those in the summer (cleaner air mass from the Pacific Ocean), respectively. This study demonstrated that air pollutants were transported from the Asian continent to the Okinawa islands and affected the air quality in the region. There may also be impacts on ecosystems, because increased concentrations of particulate NO3- could increase nutrient levels around the Okinawa islands. (C) 2014 Elsevier Ltd. All rights reserved.