Collaborative Research: Atmospheric measurements of O2/N2 ratio, CO2 concentration, and CO2 isotopes in support of the Arctic Observing Network

合作研究：O2/N2 比率、CO2 浓度和 CO2 同位素的大气测量，支持北极观测网络

• 批准号: 1304875
• 负责人: Cynthia Nevison
• 金额: $ 9.65万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-01-15 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1304875&HistoricalAwards=false
• 关键词: Collaborative; Research; Atmospheric; measurements; O2

This project will support a continuation of time series measurements of atmospheric CO2 concentration, the stable isotopes of CO2, and the O2/N2 and Ar/N2 ratios of air samples collected at Arctic sampling stations. Measurements of O2/N2 ratio at Arctic sites, when also combined with measurements at lower latitudes, have the potential to help quantify the magnitude of the seasonal air-sea exchanges of O2 with the Arctic Ocean, which could be a key indicator of biogeochemical change in a time of rapid Arctic warming. Although the land biosphere also contributes to seasonal variations in O2/N2 ratio, the ocean contribution can be resolved by combining O2/N2 and CO2 data to compute the tracer atmospheric potential oxygen (APO), which is effectively an atmospheric tracer of ocean biology and chemistry. This work will draw on support from international collaborators, with the potential to shape Arctic O2/N2 measurements by the international community into a critical component of the AON. Measurements of the 13C/12C ratio and 18O/16O ratio at Arctic sites also may provide key early warning indicators of ecological change. The project will support the archiving of aliquots of atmospheric CO2 in background arctic air to be used for open-ended purposes by future researchers. Finally, the project will support graduate student involvement in the collection and foster collaborations among scientific groups engaged in measurements of O2 and CO2 isotopes in support of detecting Arctic change.

该项目将支持对大气二氧化碳浓度、二氧化碳稳定同位素以及在北极采样站收集的空气样本的 O2/N2 和 Ar/N2 比率进行持续的时间序列测量。 北极地点的 O2/N2 比率测量，与低纬度地区的测量相结合，有可能有助于量化 O2 与北冰洋季节性海气交换的程度，这可能是生物地球化学变化的关键指标在北极迅速变暖的时期。尽管陆地生物圈也对 O2/N2 比率的季节性变化产生影响，但海洋的影响可以通过结合 O2/N2 和 CO2 数据来计算示踪剂大气潜在氧 (APO) 来解决，该示踪剂是海洋生物和大气的有效示踪剂。化学。这项工作将得到国际合作者的支持，有可能将国际社会的北极 O2/N2 测量纳入 AON 的重要组成部分。 北极地区 13C/12C 比值和 18O/16O 比值的测量也可以提供生态变化的关键预警指标。该项目将支持将北极空气背景中的大气二氧化碳等分试样存档，以供未来的研究人员用于开放式目的。最后，该项目将支持研究生参与收集工作，并促进从事氧气和二氧化碳同位素测量的科学团体之间的合作，以支持探测北极变化。