Characterization of the Physical and Chemical Properties of Water Insoluble Atmospheric Aerosol

该项目的重点是确定大小不同的大气气溶胶中不溶于水的成分。这可能是气溶胶的重要部分，主要由含碳材料或矿物质（灰尘）组成。不溶性部分可影响人类健康，可影响气溶胶的吸湿/云成核性质，并且可存款在叶子上，从而减少植物可用于光合作用的辐射量，从而减少作物产量。发展了一种新的技术来真实的实时测量不溶性气溶胶的数浓度。此外，将在微孔冲击器上收集气溶胶样品，冲洗过滤器，并测定各粒度级的不溶性组分的质量。将测量不溶部分的微量金属成分，并量化元素和有机碳部分（EC/OC）。实地测量数据将用于研究不溶性气溶胶对植物光合作用的影响，这是由于沉积在叶片上的不溶性气溶胶对太阳辐射的散射和吸收。

This project focuses on characterizing the water-insoluble component of size-segregated atmospheric aerosols. This can be a significant fraction of the aerosol and consists primarily of carbonaceous material or minerals (dust). The insoluble fraction could affect human health, can influence the hygroscopic/cloud nucleating properties of the aerosol, and can deposit on leaves and thus decrease the amount of radiation available to the plants for photosynthesis and thus crop production. A novel technique will be developed to measure the number concentration of the insoluble aerosol in real time. In addition, aerosol samples will be collected on micro-orifice impactors, the filters rinsed, and the mass of the insoluble component determined for each size fraction. The trace metal composition of the insoluble fraction will be measured, and the elemental and organic carbon fractions (EC/OC) quantified. Field measurement data will be used to study the impact of insoluble aerosol on plant photosynthesis due to the scattering and absorption of solar radiation by insoluble aerosols deposited onto leaves.