A new assessment in North Atlantic waters of the relationship between DMS concentration and the upper mixed layer solar radiation dose
A new assessment in North Atlantic waters of the relationship between DMS concentration and the upper mixed layer solar radiation dose
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北大西洋水域 DMS 浓度与上混合层太阳辐射剂量之间关系的新评估
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
G. Caniaux
中科院分区：
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作者：
S. Belviso;G. Caniaux
2001年在大西洋东北部进行的POMME实验的结果被用来探索二甲硫醚浓度是否与Vallina和Simó（2007年）提出的海洋上层生态系统暴露于太阳辐射有关。根据DMS与DMSP比率的季节变化，我们发现夏季地表水DMS浓度平均比DMSP丰度预期高出三倍。这是在协议与以前的意见，并证实了营养制度的季节性变化，从中营养在冬季和春季寡营养在夏季，伴随着相对增强DMS DMSP。然而，与在西北大西洋的水文站S进行的观测相反，在东北大西洋，DMS和太阳辐射剂量（SRD）之间没有很强的关系。从一系列灵敏度测试中，研究了驱动SRD的三个参数的不同组合（即，太阳辐照度、海水中太阳辐照度的衰减规律以及混合层深度），我们发现SRD仅占与月表面DMS浓度相关的方差的19%至24%。此外，DMS和SRD之间的关系的斜率是特别敏感的辐照度衰减规律的选择。总体而言，我们发现，DMS与SRD的关系是在东北大西洋比在马尾藻海显着得多。此外，我们建议夏季DMS浓度在地中海的中营养沿海沃茨的藻类群落结构的影响很大。因此，我们质疑DMS与SRD之间的关系在地方，流域和全球尺度上的一致性，并建议DMS与SRD的经验关系应谨慎应用。
The results of the POMME experiment, conducted in the northeast Atlantic Ocean in 2001, were used to explore whether dimethylsulfide (DMS) concentrations are linked to epipelagic ecosystem exposure to solar radiation as proposed by Vallina and Simó (2007). According to the seasonal variations in the DMS‐to‐dimethylsulfoniopropionate (DMSP) ratio, we found that the summer surface water concentration of DMS was, on average, threefold higher than expected from the abundance of DMSP. This is in agreement with previous observations and confirms that seasonal changes in the trophic regime, from mesotrophy in winter and spring to oligotrophy in summer, are accompanied by a relative enhancement of DMS over DMSP. However, contrary to the observations carried out at Hydrostation S in the northwest Atlantic Ocean, no strong relationship between DMS and the solar radiation dose (SRD) exists in the northeast Atlantic Ocean. From a series of sensitivity tests, where different combinations of the three parameters that drive the SRD were investigated (i.e., the solar irradiance, the law of its attenuation in the sea, and the mixed layer depth), we found that the SRD accounted for only 19% to 24% of the variance associated with monthly surface DMS concentrations. Additionally, the slope of the relationship between DMS and SRD was particularly sensitive to the choice of the irradiance attenuation law. Overall, we find that the DMS versus SRD relationship is much less significant in the northeast Atlantic Ocean than in the Sargasso Sea. In addition, we suggest a large impact of algal community structure on summer DMS concentrations in the mesotrophic coastal waters of the Mediterranean Sea. Therefore, we question the consistency between DMS versus SRD relationships at local, basin, and global scales and propose that empirical relationships relating DMS to SRD be applied with caution.