Heterogeneous Chemical Processes of Importance in the Stratosphere

拟议的研究包括化学研究 大气中涉及云的重要过程 粒子 有强烈的迹象表明极地平流层 云的化学性质非常活跃， 将化合物转化为有效促进臭氧消耗的形式。 本提案中的研究旨在阐明 这些过程的机制，并在测量参数， 化学反应速率，这是需要模拟的行为， 极地平流层，并预测未来的影响， 释放人造氯氟烃。 更具体地说，PI计划描述各种 大气层中的冰（由水组成， 不同量的HNO3、H2SO4和HCl）， 分析技术如差示扫描量热法， 并通过红外和紫外分光光度法测量 各种冰的HCl蒸汽压作为以下函数： 冰的成分 PI还计划 确定ClONO2和N2O5蒸汽的反应概率 与含有大量HCl的冰相互作用， 适合平流层条件。

The proposed research consists of studies of chemical processes of importance in the atmosphere which involve cloud particles. There are strong indications that polar stratospheric clouds are chemically very active, transforming stable chlorine compounds to a form that efficiently promotes ozone depletion. The studies in this proposal are aimed at elucidating the mechanism for such processes, and at measuring parameters such as chemical reaction rates, which are needed to model the behavior of the polar stratosphere and to predict future effects of the release of man-made chlorofluorocarbons. More specifically, the PI plans to characterize the various ices of atmospheric interest (which consist of water with varying amounts of HNO3, H2SO4 and HCl) by means of thermal analysis techniques such as differential scanning calorimetry, and by infrared and ultraviolet spectrophotometry and to measure the vapor pressures of HCl for the various ices as a function of the ice composition via mass spectrometry. The PI also plans to determine reaction probabilities for ClONO2 and N2O5 vapors interacting with ices containing amounts of HCl which are appropriate for stratospheric conditions.