Laboratory Studies of Heterogeneous Chemistry on Clays and Minerals Representative of Tropospheric Dust Aerosol

将对代表大气尘埃的模型颗粒进行多相吸收和化学反应的实验室研究。使用的仪器将是新开发的努森流动池反应堆，配备了用于监测气体反应物的质谱仪和用于检测凝聚相物种的傅立叶变换红外光谱仪。实验将在代表对流层中上层的温度和相对湿度条件下进行。将作为相对湿度、温度、颗粒质量和颗粒大小的函数来研究的具体反应包括五氧化二氮(N205)的水解、臭氧的吸收以及甲醇等小有机分子的吸收和可能的反应。这项工作很重要，因为它将为长期以来被认为是大气中重要的过程提供直接测量。大气气溶胶影响地球的辐射预算和空气质量。

Laboratory studies of heterogeneous uptake and chemical reactions on model particles representing atmospheric dust will be carried out. The apparatus used will be a newly developed Knudsen cell flow reactor equipped with a mass spectrometer for monitoring gaseous reactants and a Fourier-transform infrared spectrometer for detection of the condensed phase species. The experiments will be carried out at temperature and relative humidity conditions representative of the middle/upper troposphere. Specific reactions that will be studied as a function of relative humidity, temperature, particle mass and grain size include the hydrolysis of dinitrogen pentoxide (N205), the uptake of ozone, and the uptake and possible reaction of small organic molecules such as methanol.This work is important because it will provide direct measurements for processes long believed to be important in the atmosphere. Atmospheric aerosols affect the Earth's radiative budget and air quality.