| 青岛近岸海域二甲基硫排放和大气中二甲基硫浓度变化 |
| 摘要点击 1706 全文点击 1842 投稿时间：2003-03-13 修订日期：2003-06-13 |
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| 中文关键词 青岛近岸 二甲基硫 海气通量 季节变化 |
| 英文关键词 Qingdao near-shore Dimethylsulfide sea-air flux Seasonal variation |
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| 中文摘要 |
| 为研究我国受人为干扰严重的近岸海域DMS排放规律,利用固体吸附-解吸的富集采样方法和冷却预浓缩的分析方法,分别在2001年夏秋季和2002年春秋季,对青岛近岸海域海水和大气中的二甲基硫进行了采样和分析.结果表明,海水中DMS浓度和海气排放通量呈现明显的空间分布和季节变化.夏季,青岛近岸的海水DMS平均浓度最高,达1169.47 ng·L-1;春季最低,只有226.99 ng·L-1.河口区、风景旅游区和奥运赛场区在夏季有显著的从高到低的浓度梯度变化,而春秋季不明显.DMS海气排放通量主要由海水浓度决定,因此两者呈现一致的变化规律.海洋大气中的DMS也呈现夏季较高(256.44 ng·m-3),秋季较低(195.64 ng·m-3)的季节变化.文中还初步探讨了大气DMS的日变化情况.
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| 英文摘要 |
| To investigate the emission of dimethylsulfide in near-shore waters seriously disturbed by human activities in China, using the solid absorption-desorption and cryogenic preconcentration method, sampling and analysis of seawater and atmospheric DMS in Qingdao near-shore waters were carried out during 2001～2002. The results showed that the spatial distribution and seasonal variation of seawater DMS concentrations and sea-air fluxes were evident. In summer, the average of seawater DMS concentrations was highest, amounting to 1169.47 ng·L-1 and lowest in spring, only 226.99 ng·L-1. The obvious concentration gradient in estuarine, landscape and Olympic Game areas were observed in summer, but in spring and autumn is not so evident. Sea-air flux of DMS was mainly determined by seawater concentration, therefore the sea-air flux coincided with seawater concentration. Average atmospheric DMS concentration was higher in the summer (256.44 ng·m-3) and lower in the autumn (195.64 ng·m-3). The diurnal variation of atmospheric DMS was discussed in paper. |
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