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

该项目将支持继续对大气二氧化碳浓度、二氧化碳稳定同位素以及北极采样站采集的空气样本的O2/N2和Ar/N2比率进行时间序列测量。对北极地区O2/N2比率的测量，如果也与低纬地区的测量相结合，有可能有助于量化与北冰洋之间O2的季节性海-气交换的规模，这可能是北极快速变暖时期生物地球化学变化的一个关键指标。尽管陆地生物圈对O2/N2值的季节变化也有贡献，但海洋的贡献可以通过结合O2/N2值和CO2数据来计算示踪大气潜在氧(APO)来解决，APO是海洋生物和化学的有效大气示踪剂。这项工作将得到国际合作者的支持，有可能使国际社会对北极O2/N2的测量成为AON的一个关键组成部分。北极地区13C/12C和18O/16O比值的测量也可能提供生态变化的关键预警指标。该项目将支持将北极背景空气中的等量大气二氧化碳存档，供未来的研究人员用于无限制目的。最后，该项目将支持研究生参与收集，并促进从事O2和CO2同位素测量的科学小组之间的合作，以支持探测北极变化。

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.