Winter-Spring Hydroperoxide Measurements and Photochemistry Over Northcentral North America During TOPSE

本项目涉及在春分对流层臭氧生产实验（TOPSE）期间，在NCAR C-130飞机上测量过氧化氢、H202、甲基过氧化氢、CH3OOH和其他有机氢过氧化物如CH3C(O)OOH、CH3CH2OOH、HOCH2OOH的对流层混合比例。TOPSE是一个多研究者、多机构的项目，旨在研究中纬度到极北半球从冬季到春季过渡期间臭氧和其他污染物化合物的春季光化学。过氧化氢是过羟基自由基的直接产物，有机氢过氧化物是大多数碳氢化合物氧化的中间体，也是有机过氧基和过羟基自由基的产物。过氧化氧自由基和一氧化氮是生成新臭氧所必需的。氢过氧化物将使用一种已建立的机载方法进行原位测量，该方法涉及气态氢过氧化物的水收集，随后是高效液相色谱分离和氢过氧化物衍生物的荧光检测。TOPSE空气过氧化氢测量将为该地区和一年中的时间提供一套独特的分布测量，并且与正在开发的全球三维耦合动态和光化学模型的结果进行比较是理想的。

This project involves the measurement of tropospheric mixing ratios of hydrogen peroxide, H202, methylhydroperoxide, CH3OOH, and other organic hydroperoxides, e.g., CH3C(O)OOH, CH3CH2OOH, HOCH2OOH, on board the NCAR C-130 aircraft during the Tropospheric Ozone Production about the Spring Equinox experiment (TOPSE). TOPSE is a multi-investigator, multi-institutional program designed to study the springtime photochemistry of ozone and other contaminant compounds over the mid-latitude to polar Northern Hemisphere during the transition from winter to spring conditions. Hydrogen peroxide is a direct product of perhydroxyl radicals and the organic hydroperoxides are intermediates in the oxidation of most hydrocarbons, as well as, being products of organic peroxyl and perhydroxyl radicals. It is the peroxyl radicals, as well as, nitric oxide which are necessary for new ozone production. The hydroperoxides will be measured in situ using an established airborne methodology involving aqueous collection of the gaseous hydroperoxides followed by HPLC separation and fluorescence detection of a hydroperoxide derivative. The TOPSE airborne hydroperoxide measurements will provide a unique set of distribution measurements for this region and time of year and are desirable for comparison with the results of developing global 3-dimensional coupled dynamic and photochemical models.