Photochemical Production and Microbial Oxidation of Carbon Monoxide in Marine Waters

一氧化碳是世界海洋中碳和氮循环的重要组成部分。光化学和微生物学研究表明，CO主要是由天然溶解有机物氧化产生的。然而，目前对海洋中CO光化学生成的主要分子组分、影响CO形成和消耗的主要环境因素以及微生物在CO有机源再生中的作用知之甚少。作为过去研究的延续，本研究将进一步研究海洋和淡水系统中CO的光化学和微生物循环的基本机制。本研究的主要目的是：(1)利用基本光化学理论和有关已确定的天然溶解有机物成分和母体腐殖质可能结构的现有信息，确定CO光化学生产的可能分子成分；(2)研究溶解氧、过渡金属和低分子量有机化合物对CO的形成和消耗的影响，这些化合物在海面上不明显吸收阳光；(3)研究微生物在水生腐殖质转化中的作用，包括在CO的光生产中。

9416560 JONES Carbon monoxide is an important component in the cycling of carbon and nitrogen in the world oceans. Photochemical and microbiological studies have shown that CO is mainly produced by the oxidation of natural dissolved organic matter. At present, however, little is known about the major molecular components responsible for the photochemical production of CO, the main environmental factors which affect the CO formation and consumption, and the role of microorganisms in the regeneration of organic source of CO in the ocean. As a continuation of past research this effort will further study the basic mechanisms for the photochemical and microbial cycling of CO in marine and fresh water systems. The main objectives of this research are to: (1) identify possible molecular components for the photochemical production of CO with basic photochemical theory and available information about the identified components of natural dissolved organic matter and possible structures of parent humic substances, (2) examine the influences of dissolved oxygen, transition metals and low molecular weight organic compounds which do not appre- ciably absorb sunlight at sea surface on the formation and con- sumption of CO, and (3) examine the role of microorganisms in the transformation of aquatic humic substances including in the photo- production of CO.