Influence of photochemistry on the marine biogeochemical cycle of dimethylsulphide in the northern North Sea
Influence of photochemistry on the marine biogeochemical cycle of dimethylsulphide in the northern North Sea
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DOI：
10.1016/s0967-0645(02)00070-x
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发表时间：
2002-01-01
影响因子：
3
通讯作者：
Hatton, AD
中科院分区：
文献类型：
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作者：
Hatton, AD
在北海北方进行了船上实验，以评估由于UVB和UVA/可见光的二甲基硫（DMS）的去除率和DMSO的产生率。使用0.2妈妈过滤海水和自然光条件下进行实验。DMS的光解速率常数确定为0.03和0.07 h（-1）之间，初始光解速率为1.3和2.5 nmol dm（-3）d（-1）之间。利用这些速率、向下辐照的原位剖面和水柱中的DMS浓度，确定水柱上部20 m的光化学周转速率常数为0.1至0.37 d（-1），光化学周转时间为2.5至9.5天。DMSO光产率高达1.20 nmol dm（-3）d（-1）。此外，结果表明，在UVA/可见光下，大部分DMS被光氧化形成DMSO，而在UVB辐射下，DMS可以通过第二光解途径被去除。(C)2002爱思唯尔科技有限公司版权所有。
Shipboard experiments were conducted in the northern North Sea to assess the rate of removal of dimethylsulphide (DMS) and the rate of production of DMSO due to both UVB and UVA/visible light. Experiments were conducted using 0.2-mum filtered seawater and natural light conditions. The DMS photolysis rate constant was determined to be between 0.03 and 0.07 h(-1), and initial photolysis rates were between 1.3 and 2.5 nmol dm(-3) d(-1). Using these rates, the in situ profiles for downward irradiance, and the DMS concentration in the water column, a photochemical turnover rate constant of between 0.1 and 0.37 d(-1) was determined for the upper 20 m of the water column, with a photochemical turnover time of between 2.5 and 9.5 days. DMSO photoproduction rates were up to 1.20 nmol dm(-3) d(-1). Furthermore, results indicate that under UVA/visible light most of the DMS is photo-oxidised to form DMSO, whereas under UVB radiation DMS may be removed via a second photolysis pathway. (C) 2002 Elsevier Science Ltd. All rights reserved.