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

合作研究：阿拉斯加北方森林野火中棕色碳 (BrC) 的测量和建模

• 批准号: 2026821
• 负责人: Jingqiu Mao
• 金额: $ 45.4万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2026821&HistoricalAwards=false
• 关键词: Collaborative; Research; Measurement; Modeling; Brown

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.

该项目的重点是表征北极生物质燃烧产生的棕色碳（BrC）的排放、光学特性和辐射影响。 这一假设是，北极的溴化碳是不同的，因为北方森林火灾往往是阴燃的，因为大量消耗地下生物量，而北极的气溶胶的光化学处理较慢，因为平流层臭氧对紫外线的吸收很强（光路较长）。 对北极地区BrC性质的进一步认识将有助于建立化学传输模型，更好地评估北方森林火灾中BrC的直接辐射效应，研究将集中在三个方面：（1）北方森林火灾中BrC的排放和光学性质;（2）北极地区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。 该项目包括测量和建模组件。 本项目数据收集的数据将与在北极地区设有站点的两个长期监测网络-IMPROVE网络和化学形态形成网络-的数据进行比较。 该项目的成果将与阿拉斯加大学费尔班克斯的阿拉斯加火灾科学联盟分享，以帮助将成果传播给该州的跨机构火灾管理社区。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估来支持。

项目成果

Spatial and Temporal Variability of Brown Carbon in the United States: Implications for Direct Radiative Effects

• DOI: 10.1029/2020gl090332
• 发表时间: 2020-11
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: N. June;Xuan Wang;L. Chen;J. Chow;J. Watson;Xiaoliang Wang;B. Henderson;Yiqi Zheng;J. Mao