EAGER: The Presence of a Clumped Isotope Signal in Atmospheric Carbon Monoxide (CO)

这个EAGER项目是一个高风险、高回报的项目，旨在测量一种以前从未在大气中测量过的一氧化碳同位素。从理论上讲，这种特殊的同位素异常可以用作评估大气化学反应性的示踪剂。大气中的化学反应性因季节、日照量和其他因素而异。该项目将首次测量大气中一氧化碳13C18O （31CO）的“双取代”同位素。该研究将通过收集北美东海岸中纬度沿海地区的空气样本，量化不同季节大气CO中的31CO信号，对应不同的羟基自由基（OH）丰度。还将进行实验室研究，以确定13C18O丰度对温度的依赖性。该项目可能会在古大气研究中找到应用，因为该项目的一个平行目标是评估该信号是否在全新世和更新世时代的极地冰中保存。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This EAGER project is a high risk, high reward project to measure an isotope of carbon monoxide never before measured in the atmosphere. It is theorized that this particular isotopic anomaly may be used as a tracer to assess the chemical reactivity of the atmosphere. Chemical reactivity in the atmosphere differs depending on the season, the amount of sunlight, and other factors. This project will measure, for the first time, the 'doubly substituted' isotopologue of atmospheric carbon monoxide 13C18O (31CO). The study will quantify the 31CO signal in atmospheric CO during different seasons, corresponding to different hydroxyl radical (OH) abundances, by collecting air samples from a mid-latitude, coastal site along the east coast of North America. Laboratory studies will also be conducted to determine the temperature dependence of 13C18O abundance. This project may find application in paleoatmospheric studies, as a parallel goal of the project is the evaluation of whether this signal is conserved in Holocene and Pleistocene-age polar ice.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.