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.

本次博士论文改进项目将测试一种识别周围景观中干沉积氮源区域的方法。干沉积中氮的稳定同位素可以作为识别可能来源区域的指纹，但迄今为止，尚不清楚被动过滤器收集的氮的同位素组成是否在收集过程中发生了显着变化。该项目将测试这种广泛使用的方法，并确定过滤器收集的氮的同位素组成是否可用于识别原始来源区域。在过去的几十年里，向大气排放的氮以及随后沉积到景观中的氮显著增加，导致氮从景观中渗入水道和沿海海洋，在那里造成藻华和其他环境问题。了解最终沉积在特定位置的氮的来源区域是缓解这一环境问题的重要工具。