RUI: Temporal Variability of Chromophoric Dissolved Organic Carbon (CDOM) in Rainwater: Photochemical Effects and Influence on Trace Metal Speciation

RUI：雨水中发色溶解有机碳 (CDOM) 的时间变化：光化学效应和对痕量金属形态的影响

• 批准号: 0342420
• 负责人: Robert Kieber
• 金额: --
• 依托单位: University of North Carolina at Wilmington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-06-01 至 2008-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0342420&HistoricalAwards=false
• 关键词: RUI; Temporal; Variability; Chromophoric; Dissolved

Little is currently known as to the nature of light-sensitive dissolved organic matter in rainwater, despite such matter comprising the majority of carbon present in precipitation. This Research in Undergraduate Institution (RUI) project continues a series of studies by these investigators on rainwater chemistry, with a new and novel focus on the photochemistry of chromophoric dissolved organic matter (CDOM). This process will be characterized by quantitatively determining how selected trace metals affect the quantum efficiency and rate of CDOM photodegradation and photo-bleaching under a variety of conditions representative of the ambient environment. Results from this study will increase understanding of atmospheric oxidative capacity, the fate of dissolved organic matter in rainwater, and biosphere/biota response to climate-induced changes in incident ultraviolet radiation. New information on the physical and chemical factors determining the nature, reactivity and fate of CDOM in rainwater will be especially useful for constraining new generation climate models. Broader community impacts include bringing highly relevant and timely climate-related research to the undergraduate classroom at the host institution, thereby challenging the next generation of young geoscientists with important and engaging real-world issues and problems.

目前，雨水中光敏性溶解有机物的性质鲜为人知，尽管这种物质包括降水中的大部分碳。 这项在本科机构（RUI）项目中的研究继续进行了这些研究人员在雨水化学方面的一系列研究，新的新颖的重点是发色光化学的溶解有机物（CDOR）的光化学。 该过程的特征是定量确定所选的痕量金属如何影响CDOM光降解的量子效率和速率，并在代表环境环境的各种条件下进行了拍照。 这项研究的结果将增加对大气氧化能力的理解，雨水中溶解有机物的命运以及对气候引起的入射紫外线变化的生物圈/生物群的反应。 关于确定雨水中CDON的性质，反应性和命运的物理和化学因素的新信息对于约束新一代气候模型特别有用。 更广泛的社区影响包括将高度相关和及时的与气候相关的研究带到主机机构的本科教室，从而挑战了下一代的年轻地球科学家，并具有重要且引人入胜的现实世界中的问题和问题。