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

该项目涉及在关于春分实验(TOPSE)的对流层臭氧生产期间，在NCAR C-130飞机上测量对流层过氧化氢、H202、甲基过氧化氢、CH3OOH和其他有机过氧化氢，如CH3C(O)OOH、CH3CH2OOH、HOCH2OOH的混合比率。TOPSE是一个多研究者、多机构的计划，旨在研究从冬季条件向春季条件过渡期间中纬度到极地北半球的臭氧和其他污染物化合物的春季光化学。过氧化氢是过氧化氢自由基的直接产物，有机过氧化氢是大多数碳氢化合物氧化的中间产物，也是有机过氧化氢和过氧化氢自由基的产物。过氧基和一氧化氮是产生新臭氧所必需的。将使用一种既定的空中方法现场测量过氧化氢，该方法包括对气态过氧化氢进行水溶液收集，然后进行高效液相分离，并对过氧化氢衍生物进行荧光检测。TOPSE空中氢过氧化氢测量将为这一区域和一年中的时间提供一套独特的分布测量，并有望与开发全球三维耦合动态和光化学模型的结果进行比较。

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.