青岛近岸海域二甲基硫排放和大气中二甲基硫浓度变化

Dimethylsulfide Emission in Qingdao Near-shore Waters and Atmospheric Dimethylsulfide Concentration Variation

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 2 0 0 1年夏秋季和 2 0 0 2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 116 9 4 7ng·L-1;春季最低 ,只有 2 2 6 99ng·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 (2 5 6 4 4ng·m-3 ) ,秋季较低 (195 6 4ng·m-3 )的季节变化 .文中还初步探讨了大气DMS的日变化情况 .

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.