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非均相吸收和化学反应的实验室研究。 所使用的设备将是一个新开发的努森细胞流动反应器配备了质谱仪监测气态反应物和傅立叶变换红外光谱仪检测的凝聚相物种。 实验将在对流层中/上层的温度和相对湿度条件下进行。 具体的反应将被研究作为相对湿度，温度，颗粒质量和粒度的函数，包括五氧化二氮（N2 O 5）的水解，臭氧的吸收，以及小有机分子（如甲醇）的吸收和可能的反应。这项工作很重要，因为它将提供直接测量的过程长期以来被认为是重要的大气。 大气气溶胶影响地球的辐射收支和空气质量。

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.