DISSERTATION RESEARCH: Determining the source of atmospheric nitrogen through the analysis of nitrogen and oxygen isotopes in passively collected dry deposition

论文研究：通过分析被动收集的干沉积物中的氮和氧同位素来确定大气氮的来源

• 批准号: 1110832
• 负责人: Edith Allen
• 金额: $ 1.06万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2012-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1110832&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Determining; source; atmospheric

This doctoral dissertation improvement project will test a method to identify the source areas for nitrogen being deposited as dry deposition in the surrounding landscape. Stable isotopes of nitrogen in dry deposition can be used as a fingerprint to identify possible source areas, but to date it has been unclear whether the isotopic composition of nitrogen that is collected by passive filters is altered significantly during the collection process. This project will test this widely used methodology and determine whether isotopic composition of nitrogen collected on filters can be used to identify the original source areas.Nitrogen emissions to the atmosphere and subsequent deposition to the landscape has increased significantly over the past several decades, leading to nitrogen leaching off the landscape into waterways and coastal oceans where it causes algal blooms and other environmental problems. Understanding the source areas of nitrogen that is ultimately deposited in specific locations is an important tool in mitigating this environmental problem.

这一博士论文改进项目将测试一种方法，以确定氮素在周围景观中作为干沉积沉积的源区。干沉积中氮的稳定同位素可用作指纹，以确定可能的来源区域，但迄今为止，尚不清楚被动过滤器收集的氮的同位素组成在收集过程中是否发生了重大变化。该项目将测试这一广泛使用的方法，并确定通过过滤器收集的氮的同位素组成是否可以用来确定原始来源区域。过去几十年来，氮素排放到大气中并随后沉积到地貌中的数量显著增加，导致氮从地貌渗入水道和沿海海洋，造成藻类水华和其他环境问题。了解最终沉积在特定地点的氮源区域是缓解这一环境问题的重要工具。