The Regional Particulate Matter Model .1. Model description and preliminary results
The Regional Particulate Matter Model .1. Model description and preliminary results
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DOI：
10.1029/95jd02093
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发表时间：
1995-12-20
影响因子：
4.4
通讯作者：
Shankar, U
中科院分区：
文献类型：
--
作者：
Binkowski, FS;Shankar, U
区域酸沉降模型已被修改，以创建区域颗粒模型，这是一个三维欧拉模型，模拟一次排放和二氧化硫气相氧化产生的硫酸气溶胶的化学，运输和动力学。新模型使用双峰对数正态分布来表示亚微米尺寸范围内的颗粒。除了包括气溶胶数浓度和硫酸盐质量浓度场的水平和垂直平流以及垂直扩散外，该模型现在明确地处理分布参数对模式内和模式之间的颗粒凝结、硫酸盐蒸汽在现有颗粒上的凝结、新颗粒的形成、氨存在下环境水蒸汽的蒸发和凝结的响应，和依赖于颗粒大小的干沉积。该模型已被用来研究环境氨的硫酸中和程度如何影响总的气溶胶浓度和粒径分布在北美东部。三个代表性地点（农村、近源和源的名义顺风）的初步结果表明，农村地区的影响最大，近源地区的影响最小，这分别对应于铵的最大值和最小值硫酸盐摩尔比。结果表明，该模型可以提供一个工具，调查各种污染控制策略的影响，以及新的或替代配方的重要气溶胶过程。
The Regional Acid Deposition Model has been modified to create the Regional Particulate Model, a three-dimensional Eulerian model that simulates the chemistry, transport, and dynamics of sulfuric acid aerosol resulting from primary emissions and the gas phase oxidation of sulfur dioxide. The new model uses a bimodal lognormal distribution to represent particles in the submicrometer size range. In addition to including the horizontal and vertical advection and vertical diffusion of the aerosol number concentration and sulfate mass concentration fields, the model now explicitly treats the response of the distribution parameters to particle coagulation within and between the modes, condensation of sulfate vapor onto existing particles, formation of new particles, evaporation and condensation of ambient water vapor in the presence of ammonia, and particle-size-dependent dry deposition. The model has been used to study how the degree of sulfuric acid neutralization by ambient ammonia affects the total aerosol concentrations and particle size distributions over eastern North America. Preliminary results for three representative locations, rural, near-source, and nominal downwind of source, show that the effect is greatest for the rural and smallest for the near-source regions, which corresponds with the largest and smallest values, respectively, of ammonium-to-sulfate molar ratios. The results indicate that the model could provide a tool for investigating the effects of various pollution control strategies, as well as new or alternative formulations of important aerosol processes.