Morphology and Dynamics of Atmospheric Aerosol Aggregates

该项目将研究大气中超细(直径小于0.1微米)气溶胶聚集体的性质。高碳含量的气溶胶聚集体可能会显著影响光的吸收和散射，从而影响全球辐射平衡。这种大小范围内的颗粒物也是公共卫生问题。将研究大气中气溶胶集合体的形态，包括组成集合体的初级粒子的分维、数量和大小，集合体的浓度和尺寸分布，以及作为集合体的总超细粒子的比例。这些特性很重要，因为气溶胶传输速率和气粒分配系数可以作为聚集体形态的函数而变化，从而影响大气中的停留时间和气溶胶在肺部和其他表面的沉积模式。

This project will investigate the properties of ultrafine (particle diameters less than 0.1 micrometer) aerosol aggregates in the atmosphere. Aerosol aggregates with high carbon content may significantly affect light absorption and scattering and hence the global radiation balance. Particles in this size range are also of public health concern. The morphology of aerosol aggregates in the atmosphere will be studied, including the fractal dimension and number and size of the primary particles that compose the aggregates, concentrations and size distribution of the aggregates, and fraction of total ultrafine particles that are aggregates. These properties are important because aerosol transport rates and gas-particle partitioning factors can vary as a function of aggregate morphology, affecting the atmospheric residence time and patterns of deposition of aerosols in the lung and on other surfaces.