The role of marine photochemical reactions in removal of dissolved material in the Yellow Sea

黄海是世界上自然和人为物质流入和清除最活跃的沿海海域之一。为了评估光化学反应在去除水中溶解物质方面的作用，我们进行了如下野外观测和模拟实验。1.卫星观测(SeaWiFS Level 3数据)黄海和东中国海陆地腐殖质的分布。2.韩国海洋研究开发研究所科考船2001年和2003年在黄海的野外观测。3.在滨内海和周边河流进行野外观测，与黄海的物质动力学进行比较。4.利用太阳和人造光模拟黄海的光化学实验。根据上述观测和实验，得出以下结果：1.黄海的腐殖质浓度随着距离海岸的距离而减少，SETO内海有类似的特征，说明稀释和光反应可能会影响水中腐殖质的分布。3.一氧化碳和过氧化氢的分布模式明显支持光化学反应在水中进行。4.结构未知的有机化合物可能是黄海产生OH自由基的原因。

The Yellow Sea is one of coastal marine areas where inflows and removal of natural and anthropogenic material are most active in the world. In order to evaluate the role of photochemical reactions in removing dissolved matter in water, we conducted field observations and simulation experiments as follows.1.Satellite observation (SeaWiFS Level 3 data) for the distribution of terrestrial humic substances in the Yellow Sea and East China Sea.2.Field observations by the research vessels of Korea Ocean Research and Development Institutes in the Yellow Sea in 2001 and 2002.3.Field observations in the Seto Inland Sea and surrounding rivers to compare the material dynamics with the Yellow Sea.4.Photochemical experiments using sun and artificial lights to simulate photoreactions in the Yellow Sea.Following results were obtained from the above-described observations and experiments.1.The humic concentrations in the Yellow Sea decrease with the distance from the coast, showing lower levels in summer than autumn.2.Similar features are observed in the Seto Inland Sea, suggesting the dilution and photoreactions should affect humic distribution in water.3.Distribution patterns of carbon monoxide and hydrogen peroxide clearly supported the photochemical reactions to proceed in water.4.Organic compounds with unknown structures were suggested to be responsible for OH radical generation in the Yellow Sea.