Characteristics of water-soluble components of atmospheric aerosols in Yokohama and Mt. Oyama, Japan from 1990 to 2001
Characteristics of water-soluble components of atmospheric aerosols in Yokohama and Mt. Oyama, Japan from 1990 to 2001
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DOI：
10.1016/j.atmosenv.2004.05.027
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发表时间：
2004-09
影响因子：
5
通讯作者：
Masaki Takeuchi;H. Okochi;M. Igawa
中科院分区：
文献类型：
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作者：
Masaki Takeuchi;H. Okochi;M. Igawa
我们连续采集了1990~1997年PM7和1998~2001年PM10-2和PM2的气溶胶样品，并在横滨(35°28‘N，139°38’E)和山坡(680masl)测定了它们的pH值、电导率、主要离子、溶解有机碳(DOC)和总质量(TM)的水溶性组分。日本Oyama(35°28‘N，139°46’E，1252 Masl)，以对比城市站点和山区站点之间的气溶胶成分。横滨10多年来TM年平均浓度随NH_4~+、Mg~(2+)、Cl~(−)和SO_4~(2+)−浓度的降低而逐渐降低，且以冬季最高，夏季最低。在Mt.Oyama，持续时间变化不明显，TM浓度在春末至夏初最高，但季节变化较小。山上Cl-−与Na+的当量浓度比。Oyama比横滨低，这是因为在山上采集的气溶胶发生的氯损失更大。小山远离大海，而不是横滨。计算了硫磺到硫酸盐的转化率，发现硫磺转化率受两个点上氧浓度变化的影响不大，在Mt.夏天的小山。无论风向如何，弱风速下的NH_4+、NO_3-−、SO_4~(2+)、−和DOC浓度均高于强风向下。
We continuously collected aerosol samples of PM7from 1990 to 1997 and of PM10–2and PM2from 1998 to 2001 and measured their water-soluble components of pH, conductivity, major ions, dissolved organic carbon (DOC) and total mass (TM) in an urban site, Yokohama (35°28′N, 139°38′E) and the mountainside (680masl) of Mt. Oyama (35°28′N, 139°46′E, 1252masl), Japan, to contrast the aerosol composition between an urban site and a mountain site. In Yokohama, annual mean TM concentration decreased gradually for over 10 years with the decrease of NH4+, Mg2+, Cl−, and SO42−concentrations, and TM concentrations were the highest in winter and the lowest in summer. At Mt. Oyama, there was no significant change in the duration, and TM concentrations were the highest from late spring to early summer, although the seasonal variation was smaller. Equivalent concentration ratio of Cl−to Na+at Mt. Oyama was lower than that in Yokohama, because Cl loss which occurred was larger for the aerosol collected at Mt. Oyama remote from the sea rather than Yokohama. The conversion ratio of sulfur to sulfate was calculated and the ratio was not affected strongly by the variation of Oxconcentration at both sites and was high at Mt. Oyama in summer. NH4+, NO3−, SO42−, and DOC concentrations were higher under weak wind velocity than those under strong wind velocity regardless of the wind direction in both the sites.