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

9528255 羔羊 大气气溶胶强烈影响大气中的许多过程，包括云的形成、化学转化、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成分。在对流层上部和平流层下部发现的硫酸颗粒具有很强的吸湿性，并且由于那里普遍存在的低温而倾向于吸收环境水蒸气和可溶性痕量气体。关于气溶胶的微观物理和化学的详细资料可以从实验室研究中获得。 这项研究的总体目标是确定代表性的气溶胶颗粒如何响应不同的环境条件。在环境室中电动悬浮的微米级硫酸颗粒的实验室实验将在广泛的温度和湿度范围内进行，在控制浓度的可溶性痕量气体，如硝酸或盐酸的存在下。在先前的研究中开发的实验系统被配置为无壁流动反应器，模仿大气条件。这些实验的数据将产生新的见解气溶胶-大气相互作用，并有助于验证各种气体颗粒相互作用模型所需的参数化气溶胶在大尺度大气模型的影响。

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.