Investigations into the Photochemistry of Antarctic Waters in Response to Changing Ultraviolet Radiation Fluxes

南极上空平流层臭氧的减少导致 真光层紫外辐射通量增加 海洋。 这种增加可能导致细胞损伤， 水生生物导致光抑制和减少 生产力 细胞损伤可以发生在细胞内， 或在细胞表面从生物分子反应中 与外部产生的反应性瞬态物种。 细胞外损伤将在很大程度上取决于 细胞周围海水的光化学。 到目前为止， 对南极独特的光化学知之甚少 沃茨。 该项目整合了现场和实验室方法 以获取有关海洋的基线信息， 南极洲沃茨真光层的光化学 与紫外线辐射水平的变化有关。 原位 光化学生产率和稳态浓度 一系列活性物质和溶解有机物 降解产物以及下降的紫外线辐射 将被衡量。 此外，通过原位化学 光化测定法，光化学生产各种 活性物质和溶解有机物降解产物， 以及溶解有机物的荧光和吸收特性 事情将被确定。 这些信息将作为 了解和预测紫外线影响的基础 辐射引起的海洋光化学过程 南极透光层的生产力和生态 海洋

Decreases in stratospheric ozone over the Antarctic result in an increase in the ultraviolet radiation flux in the euphotic zone of the ocean. This increase may lead to cellular damage in aquatic organisms resulting in photo-inhibition and decreased productivity. Cellular damage can occur either intracellularly, or externally at the cell surface from biomolecular reactions with externally-generated reactive transient species. Extracellular damage will depend to a large degree on the photochemistry of the seawater surrounding the cell. To date, little is known about the photochemistry of the unique Antarctic waters. This project integrates a field and laboratory approach to obtain baseline information regarding the marine photochemistry of the euphotic zone in Antarctica waters as related to changes in ultraviolet radiation levels. In situ photochemical production rates and steady state concentrations of a suite of reactive species and dissolved organic matter degradation products as well as downwelling ultraviolet radiation will be measured. Additionally, flux by in situ chemical actinometry, action spectra for photochemical production of various reactive species and dissolved organic matter degradation products, and fluorescence and absorbance properties of dissolved organic matter will be determined. This information will serve as a basis for understanding and predicting the effects of ultraviolet radiation-induced marine photochemical processes on the productivity and ecology in the euphotic zone of the Antarctic Ocean.