Collaborative Research: Sizing Up the Smoke--Evaluating and Improving Our Ability to Predict Aged Wildfire Aerosol Size Distributions

这项研究的重点是研究生物质燃烧排放物的老化。生物质燃烧产生的小颗粒可以在大气中发生反应，改变其大小，数量和成分。将对这些老化过程进行建模，并将根据实地活动的实际数据对模型结果进行检验，将调查以下问题：（1）当与生物质燃烧排放物的分散和凝聚相结合时，捕获实验室和实地看到的气溶胶尺寸和数量浓度演变的化学过程是什么？(2)二次有机气溶胶（SOA）的形成率和尺寸分布的变化在实验室实验中测量的气溶胶老化的现场测量一致？如果不是，我们能否确定原因（例如，在室实验中缺乏连续稀释或壁损失）？(3)什么性质最强烈地决定了老化生物质燃烧气溶胶的大小和数量？例如，总质量排放通量、新鲜颗粒尺寸、燃料类型、修正燃烧效率、风速、火灾面积、垂直混合深度、阳光。(4)老化的生物质燃烧气溶胶的大小和数量的可变性是否可以通过一个简单的参数化来捕获，这是上述属性中最重要的一个功能？

This research is focused on studying the aging of emissions from biomass burning. Small particles emitted from biomass combustion can react in the atmosphere, changing their size, number, and composition. These aging processes will be modeled and the model results will be tested against actual data from field campaigns.The following questions will be investigated: (1) What are the chemical processes that, when combined with the dispersion and coagulation of biomass-burning emissions, capture the evolution of aerosol size and number concentrations seen in the laboratory and the field? (2) Are the secondary organic aerosol (SOA) formation rates and size-distribution changes measured in lab experiments consistent with the field measurements of aerosol aging? If they are not, can we determine why (e.g. lack of continuous dilution or wall losses in chamber experiments)? (3) What properties most strongly determine the aged biomass-burning aerosol size and number? E.g. total mass emission flux, fresh particle size, fuel type, modified combustion efficiency, wind speed, fire area, vertical mixing depth, sunlight. (4) Can the variability in aged biomass-burning aerosol size and number be captured by a simple parameterization that is a function of the most important of the above properties?