Spatial variations of dimethylsulfide and dimethylsulfoniopropionate in the surface microlayer and in the subsurface waters of the South China Sea during springtime.
Spatial variations of dimethylsulfide and dimethylsulfoniopropionate in the surface microlayer and in the subsurface waters of the South China Sea during springtime.
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DOI：
10.1016/j.marenvres.2007.09.002
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发表时间：
2008-02
影响因子：
3.3
通讯作者：
Guipeng Yang;Wei-Wen Jing;Z. Kang;Hong‐Hai Zhang;Guisheng Song
中科院分区：
文献类型：
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作者：
Guipeng Yang;Wei-Wen Jing;Z. Kang;Hong‐Hai Zhang;Guisheng Song
2005年5月对南海低生产力区表层微层和次表层沃茨中二甲基硫（DMS）和二甲基磺基丙酸盐（DMSP）的空间分布特征进行了研究。总体而言，溶解（DMSPd）和颗粒（DMSPp）组分的DMS和DMSP的平均地下水浓度分别为1.74（1.00-2.50）、3.92（2.21-6.54）和6.06（3.40-8.68）nM。在微层中没有观察到DMS和DMSPp的富集。相比之下，微层表现出DMSPd富集，平均富集因子（EF，定义为微层浓度与地下水浓度的比值）为1.40。在研究区，没有一个硫组分与叶绿素a相关。研究发现，表层微层中的DMS、DMSP和叶绿素a浓度与次表层水体中的DMS、DMSP和叶绿素a浓度均存在相关性，表明两种水体之间存在密切联系。DMS：Chl-a和DMSPp：Chl-a的比值从北到南呈逐渐增大的趋势。这可能是由于随着表层海水温度的升高，浮游植物群落中DMSP生产者的比例发生了变化。观测到锚站DMS和DMSP浓度存在明显的日变化，白天浓度最高，夜间浓度最低。白天较高的DMS和DMSP浓度可能归因于光诱导的藻类合成和分泌DMSP以及DMS的生物生产的增加。DMS从研究区域到大气的平均通量估计为2.06μmolm−2d−1。这种低DMS排放通量，以及低DMS表面浓度是由于在这个海的低生产力。
Spatial variations in dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) were surveyed in the surface microlayer and in the subsurface waters of the low productivity South China Sea in May 2005. Overall, average subsurface water concentrations of DMS and DMSP of dissolved (DMSPd) and particulate (DMSPp) fractions were 1.74 (1.00–2.50), 3.92 (2.21–6.54) and 6.06 (3.40–8.68)nM, respectively. No enrichment in DMS and DMSPp was observed in the microlayer. In contrast, the microlayer showed a DMSPd enrichment, with an average enrichment factor (EF, defined as the ratio of the microlayer concentration to subsurface water concentration) of 1.40. In the study area, none of the sulfur components were correlated with chlorophyll a. An important finding in this study was that DMS, DMSP and chlorophyll a concentrations in the surface microlayer were respectively correlated with those in the subsurface water, suggesting a close linkage between these two water bodies. The ratios of DMS:Chl-a and DMSPp:Chl-a showed a gradually increasing trend from North to South. This might be due to changes in the proportion of DMSP producers in the phytoplankton community with the increased surface seawater temperature. A clear diurnal variation in the DMS and DMSP concentrations was observed at an anchor station with the highest concentrations appearing during the day and the lowest concentrations during the night. The higher DMS and DMSP concentrations during daytime might be attributed to the light-induced increase in both algal synthesis and exudation of DMSP and biological production of DMS. The mean flux of DMS from the investigated area to the atmosphere was estimated to be 2.06μmolm−2d−1. This low DMS emission flux, together with the low DMS surface concentrations was attributed to the low productivity in this sea.