Sources of sodium in atmospheric fine particles
Sources of sodium in atmospheric fine particles
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DOI：
10.1016/s1352-2310(02)00341-2
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发表时间：
2002-09
影响因子：
5
通讯作者：
A. Ooki;M. Uematsu;K. Miura;S. Nakae
中科院分区：
文献类型：
--
作者：
A. Ooki;M. Uematsu;K. Miura;S. Nakae
在海洋和城市空气中测量了粒度分级颗粒钠和钾的浓度。1998年夏季，在北太平洋西北部的“Hakuho-maru”号考察船巡航期间进行了海洋空气取样。1997年和1998年在东京中部进行了城市空气取样。“城市”空气中的细钠浓度（D<1.1μm）（180 ngm −3）比“海洋”空气中的细钠浓度（56 ngm −3）高3倍。在城市大气中，钠和钾的粒径分布在细颗粒物（D<1.1μm）和粗颗粒物（D>1.1μm）中均呈现双峰型。在城市空气中检测到细颗粒物范围内的人为钠的存在。城市大气细颗粒物中的K/Na重量比（1.8-2.7）比海水中的K/Na重量比（0.036）高50-75倍。城市空气中的钾被认为主要来自人为来源。在城市空气样品中，细钠和细钾浓度之间的高度相关性表明它们具有相同的人为来源。重新评估海洋空气中的K/Na比相对高于海水中的K/Na比，我们可以估计，几种人为的钠离子可以从陆地输送到遥远的海洋空气。
Concentrations of size fractionated particulate sodium and potassium were measured in both marine and urban air. Marine air sampling was conducted during a cruise on R/V Hakuho-maru in the northwestern North Pacific in the summer of 1998. Urban air sampling was performed in the central part of Tokyo in 1997 and 1998. The fine sodium concentration (D<1.1μm) in “Urban” air (180ngm−3) was 3 times higher than that in “Marine” air (56ngm−3). In the urban air samples, the size distributions of sodium and potassium showed bimodal peaks in the fine particle range (D<1.1μm) and in the coarse particle range (D>1.1μm). The existence of anthropogenic sodium in the fine particle range was detected in the urban air. The K/Na weight ratios in the fine particle range of the urban air (1.8–2.7) was 50–75 times higher than that in seawater (0.036). Potassium in the urban air is thought to be derived largely from anthropogenic sources. In the urban air samples, a high correlation between fine sodium and fine potassium concentrations suggests that they have the same anthropogenic source. Reevaluating the K/Na ratios in marine air to be relatively higher than that in seawater, we can estimate that several percents of anthropogenic sodium can be transported from land to remote marine air.