青岛近岸、东海海水CDOM特性及一氧化碳光产生研究

研究了青岛近岸和东海海水中CO的光化学产生,比较了两个不同水域海水中有色溶解有机物(CDOM)的光学特征和CO的表观量子产率.结果表明:青岛近岸海水和东海海水α(355)范围分别为0.381~0.868m-1和0.083~0.427m-1,平均值分别为0.622m-1和0.196m-1,青岛近岸海水α(355)大于东海.其中近岸海水α(355)和Sg表现出良好的相关性,而东海海水这两个参数之间无明显相关性,表现出α(355)和Sg关系的不确定性.α(355)与CO的光致产生速率呈现正相关(R2=0.8188),说明了CDOM光化学降解是CO产生的重要途径.青岛近岸海水CO的表观量子产率高于东海海水,与α(355)具有相同变化规律,说明含有高光学活性物质的CDOM发生光降解反应能更加有效地产生CO.

Study of CDOM properties and carbon monoxide photoproduction in Qingdao coast sea and the East China Sea

In this study, the photoproduction of CO in the seawater of Qingdao Coast Sea (QCS) and the East China Sea (ECS) was investigated. The optical characteristics of Chromophoric Dissolved Organic Matter (CDOM) and the Apparent Quantum Yield AQY(λ)] of CO in the seawater of the two different research areas were compared. The results showed that the absorption coefficient at 355nm α(355)] of QCS and the ECS were (0.381~0.868)m-1 and (0.083~0.427)m-1, with the averages of 0.622m-1 and 0.196m-1, respectively, indicating that the value along the coast area was higher than that in the ECS. There is a clear correlation between α(355) and Sg in the water of QCS, but the two parameters in the seawater of the ECS did not have the obvious correlation, suggesting the correlation between α(355) and Sg was undetermined. The positive correlation between α(355) and photochemical production rate of CO showed the photochemical degradation of CDOM was the important source to produce CO. Similar to the variation trend of α(355), the average AQY(λ) in QCS was higher than that in the ECS, indicating that the CDOM with the high optically active substance could yield CO more efficiently in its photodegradation reaction.