Distributions and fluxes of methyl chloride and methyl bromide in the East China Sea and the Southern Yellow Sea in autumn
Distributions and fluxes of methyl chloride and methyl bromide in the East China Sea and the Southern Yellow Sea in autumn
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DOI：
10.1016/j.marchem.2009.11.002
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发表时间：
2010-01
期刊：
影响因子：
3
通讯作者：
Xiao-lan Lu;Guipeng Yang;Guisheng Song;Liang Zhang
中科院分区：
文献类型：
--
作者：
Xiao-lan Lu;Guipeng Yang;Guisheng Song;Liang Zhang
于2007年11月测定了东海和南黄海海域甲基氯和甲基溴的分布和通量。表层沃茨中的甲基氯和甲基溴浓度范围为47.1至163 pmolL − 1和0.70至9.82 pmolL −1，平均值分别为87.6和2.97 pmolL −1。两种卤代甲烷的分布明显受长江和黑潮的影响，近岸海域浓度较高，开放沃茨浓度较低。在表层沃茨中，甲基氯和甲基溴浓度异常之间存在正线性相关，表明它们可能在该沿海地区有一些共同的来源。然而，没有发现这两个卤甲烷浓度异常之间的相关性和叶绿素a的表面沃茨。两种卤代甲烷的垂直廓线的特征是在上混合层的最大值。这两种气体在表层海水中一般都是过饱和的，氯甲烷和溴甲烷的平均海-气通量分别为391和20.0nmolm−2d−1。
We determined the distributions and fluxes of methyl chloride and methyl bromide in the East China Sea (ECS) and the Southern Yellow Sea (SYS) in November 2007. Methyl chloride and methyl bromide concentrations in the surface waters ranged from 47.1 to 163pmolL−1and from 0.70 to 9.82pmolL−1, with average values of 87.6 and 2.97pmolL−1, respectively. The distributions of the two methyl halides were clearly influenced by the Yangtze (Changjiang) River effluent and Kuroshio water, with high concentrations appearing in the coastal zone and low values occurring in the open waters. A positive linear correlation was observed between methyl chloride and methyl bromide concentration anomalies in the surface waters, suggesting that they may share some origins in this coastal area. However, no correlation was found between the two methyl halide concentration anomalies and chlorophyll a in the surface waters. The vertical profiles of the two methyl halides were characterized by the maxima in the upper mixed layer. Both gases were generally supersaturated in the surface seawater, with mean sea-to-air fluxes of methyl chloride and methyl bromide of 391 and 20.0nmolm−2d−1, respectively.