Collaborative Research: Measurement and Modeling of Brown Carbon (BrC) from Boreal Forest Wildfires in Alaska

该项目的重点是描述北极生物质燃烧产生的棕色碳(BRC)的排放、光学性质和辐射影响。假设北极的BRC是不同的，因为北方的森林火灾由于地下生物质的大量消耗而倾向于阴燃，而北极的气溶胶的光化学处理由于平流层臭氧的强紫外线吸收(较长的光路)而变得较慢。随着对北极BRC性质认识的加深，化学输运模拟将能够更好地评估来自北方森林火灾的BRC的直接辐射效应。研究将集中在三个主题上：(1)来自北方森林火灾的BRC的排放和光学性质；(2)北极有机气溶胶和黑碳的排放和物理性质；(3)北极生物质燃烧对地表辐射收支的影响。该项目包括测量组件和建模组件。本项目收集的数据将与在北极设有站点的两个长期监测网络--改良网络和化学形态网络--收集的数据进行比较。该项目的结果将与阿拉斯加大学费尔班克斯分校的阿拉斯加消防科学联盟分享，以帮助将结果传播给该州的跨部门消防管理社区。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This project is focused on characterizing the emissions, optical properties and radiative impacts of brown carbon (BrC) from biomass burning in the Arctic. The hypothesis is that BrC in the Arctic is different because boreal forest fires tend to be smoldering due to the large consumption of below-ground biomass, and the photochemical processing of aerosol in the Arctic is slower due to the strong UV absorption by stratospheric ozone (longer light path). The improved understanding of the properties of BrC found in the Arctic will enable chemical transport modeling to better assess the direct radiative effects of BrC from boreal forest fires.The research will focus on three topics: (1) the emissions and optical properties of BrC from boreal forest fires; (2) the emissions and physical properties of organic aerosol and black carbon in the Arctic; and (3) the influence of Arctic biomass burning on the radiative budget at the surface. The project includes both a measurement and a modeling component. Data collected in this project data will be compared with that from two long-term monitoring networks with sites in the Arctic, the IMPROVE network and the Chemical Speciation Network. The results of the project will be shared with the Alaska Fire Science Consortium, based at University of Alaska Fairbanks, to help disseminate the results to the interagency fire management community in the state.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.