Effects of Soluble Trace Gases on Aerosol Microphysics: Experimental Studies with Individual Ternary Solution Droplets at Low Temperatures

9528255兰姆大气气溶胶强烈影响大气中的许多过程，包括云的形成、化学变化、辐射平衡和气候。这些颗粒的化学性质和微物理行为又取决于周围空气的温度和组成。在对流层上层和平流层下层发现的硫酸颗粒具有很强的吸湿性，由于那里的温度较低，往往会吸收周围的水蒸气和可溶的微量气体。有关气溶胶的微物理和化学的详细信息可从实验室研究中获得。这项研究的总体目标是确定具有代表性的气溶胶颗粒对不同环境条件的反应。实验室实验中，微米级的硫酸颗粒将在宽广的温度和湿度范围内，在硝酸或盐酸等可溶微量气体的受控浓度存在的情况下，以电动方式悬浮在环境室内。该实验系统是在之前的研究中开发的，被配置为无壁流动反应堆，模拟大气条件。这些实验的数据将对气溶胶-大气相互作用产生新的见解，并用于验证大型大气模型中气溶胶效应参数所需的各种气体-颗粒相互作用模型。

9528255 Lamb Atmospheric aerosol strongly affects many processes in the atmosphere, including cloud formation, chemical transformations, radiation balance, and climate. The chemical nature and microphysical behavior of these particles depend in turn on the temperature and composition of the surrounding air. The sulfuric acid particles found in the upper troposphere and lower stratosphere are very hygroscopic and tend to absorb ambient water vapor and soluble trace gases because of the low temperatures prevailing there. Detailed information on the microphysics and chemistry of aerosols can be obtained from laboratory studies. The overall objective of this research is to determine how representative aerosol particles respond to varying environmental conditions. Laboratory experiments with micron-size sulfuric acid particles levitated electrodynamically in an environmental chamber will be conducted over broad ranges of temperature and humidity in the presence of controlled concentrations of a soluble trace gas, such as nitric acid or hydrochloric acid. The experimental system, developed during prior research, is configured as a wall-less flow reactor, mimicking atmospheric conditions. Data from these experiments will yield new insights into aerosol-atmosphere interactions and serve to verify various gas-particle interaction models needed to parameterize aerosol effects in large-scale atmospheric models.