Isotopic Composition of Atmospheric Carbon Monoxide

小行星9305795 确定人类活动对大气羟基自由基浓度的影响是获得全球变化准确预测的关键。 羟基水平在很大程度上决定了大气氧化还原气体的能力。 许多这些减少的气体，如氯氟烃和甲烷，是温室气体，浓度正在增加。 对目前浓度的准确估计是对用于预测温室气体未来水平和气候变化的光化学模型的一个重要检验。 该项目旨在通过结合碳-14标记的二氧化碳浓度测量和建模来确定大气羟基自由基浓度的季节性和季节性变化。 这项工作将测量大气中碳-14标记的二氧化碳浓度的季节性趋势，每两周收集一次样本，在华盛顿州（48 N）海岸的海洋空气站点和偏远站点。 一个2-D的辐射化学传输模型将被用来推导纬向平均羟基自由基场，最好地描述测量的季节性和纬向变化的碳-14标记的二氧化碳。

9305795 Quay Determining the effect of man's activities on the concentration of atmospheric hydroxyl radical is critical to obtain accurate predictions of global change. Hydroxyl radical levels determine, to a large extent, the capacity of the atmosphere to oxidize reduced gases. Many of these reduced gases, like chlorofluorocarbons and methane, are greenhouse gases that are increasing in concentration. Accurate estimates of present concentrations are an important test for photochemical models used to predict the future levels of greenhouse gases and climate change. This project is designed to determine the seasonal and meridional variability of atmospheric hydroxyl radical concentrations through a combination of carbon-14 labeled carbon dioxide concentration measurements and modeling. This work will measure the seasonal trends in atmospheric carbon-14 labeled carbon dioxide concentrations, with samples collected on a biweekly basis, at a marine air site on the coast of Washington State (48 N) and at a remote site. A 2-D radiative-chemical-transport model will be used to derive zonally averaged hydroxyl radical fields that best describe the measured seasonal and meridional variability in carbon-14 labeled carbon dioxide.