Changes in Biomass Burning Aerosol Radiative Properties Due to Atmospheric Processing of Wildfire Plumes Over the Northwestern United States

美国西北部野火羽流的大气处理导致生物质燃烧气溶胶辐射特性的变化

• 批准号: 1926817
• 负责人: Rajan Chakrabarty
• 金额: $ 41.09万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-01 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1926817&HistoricalAwards=false
• 关键词: Changes; Biomass; Burning; Aerosol; Radiative

This study will provide new insights about the chemical and physical properties of wildfire smoke. Ground-based measurements using state-of-the-art optical instrumentation will provide data on the aerosol optical and physico-chemical properties from wildfires and prescribed burns in the northwestern United States as part of an interagency collaborative field campaign (FIREX-AQ) funded by NOAA and NASA. A better understanding of the properties of smoke aerosol will improve both air quality and climate models. During the summer in 2019, a dual-cell, multi-wavelength integrated photoacoustic-nephelometer spectrometer and a portable asymmetry parameter monitor will be deployed to Boise Idaho for 4 weeks to characterize and constrain aerosol spectral optical properties as a function of fire phase, wildland fuel type, and daytime and nighttime aging of smoke. Controlled heterogeneous oxidation experiments of organic aerosol will be performed during select smoldering phase episodes using a Potential Aerosol Mass (PAM) oxidation flow tube reactor, which creates a highly oxidizing environment that simulates atmospheric oxidation processes on timescales ranging from a day up to several weeks in a short period of a few minutes. Some of the research questions that will be investigated as part of this study include the following: (1) How do the aerosol optical properties, scattering and absorption cross-sections, single scattering albedo, Angstrom exponent, and asymmetry parameter evolve with varying oxidation states, size, hygroscopicity, wildland fuel type and fire phase? (2) How do the wavelength-dependent complex refractive indices of light absorbing organic aerosol change with different degrees of atmospheric processing? (3) What is the contribution of the water-soluble organic carbon to absorption by organic aerosol? (4) What are the enhancement factors for mass absorption and scattering cross-sections of black carbon upon various degrees of internal mixing with organic aerosol? (5) Could mechanistic insight and simpler parameterizations using the concept of scaling laws be obtained for integration in process-based models? And (6) Can generalized inferences be deduced regarding distinctive and differentiating properties of organic aerosol microphysical and optical properties from real-world versus laboratory burns?This project includes several outreach activities, such as summer teacher training workshops for middle and high school teachers on air pollution.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.

这项研究将提供有关野火烟雾的化学和物理特性的新见解。 使用最先进的光学仪器的基于地面的测量将提供有关NOAA和NASA资助的机构间协作田间运动（FIREX-AQ）的一部分的野火的气溶胶光学和物理化学特性的数据。更好地了解烟雾气溶胶的特性将改善空气质量和气候模型。 在2019年的夏季，将部署一个双电池，多波长的集成光声含量计光谱仪和便携式不对称参数监视器，将其部署到爱达荷州的博伊西爱达荷州4周，以表征和限制气雾光谱光学特性作为火灾相位，野生燃料燃料类型，以及白天和夜间烟雾的效果。 使用潜在的气溶胶质量（PAM）氧化流动管反应器，将在某些闷热相发作期间进行有机气溶胶的受控异质氧化实验，从而创建一个高度的氧化环境，该环境模拟了大气氧化过程，从而在短时间内到几个星期的时间尺度上的时间标准范围内的时间标准范围。作为本研究的一部分将研究的一些研究问题包括：（1）气溶胶光学特性，散射和吸收横截面，单个散射反照率，Angstrom指数和不对称参数随着氧化状态，尺寸，大小，杂种性，Wildgopopicity，Wildland燃料类型和火灾阶段而变化？ （2）如何随着不同程度的大气加工来吸收有机气溶胶变化的光吸收有机气溶胶的折射率？ （3）水溶性有机碳对有机气溶胶吸收的贡献是什么？ （4）在各种程度的内部混合与有机气溶胶的内部混合下，黑碳的质量吸收和散射横截面的增强因子是什么？ （5）是否可以使用缩放定律的概念获得机械洞察力和更简单的参数化，以在基于过程的模型中集成？ And (6) Can generalized inferences be deduced regarding distinctive and differentiating properties of organic aerosol microphysical and optical properties from real-world versus laboratory burns?This project includes several outreach activities, such as summer teacher training workshops for middle and high school teachers on air pollution.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 标准。

项目成果

Assessing the magnitude of PM2.5 polycyclic aromatic hydrocarbon emissions from residential solid fuel combustion and associated health hazards in South Asia

评估南亚住宅固体燃料燃烧产生的 PM2.5 多环芳烃排放量及相关健康危害

• DOI: 10.1016/j.apr.2021.101142
• 发表时间: 2021
• 期刊: Atmospheric Pollution Research
• 影响因子: 4.5
• 作者: Verma, Madhuri;Pervez, Shamsh;Chow, Judith C.;Majumdar, Dipanjali;Watson, John G.;Pervez, Yasmeen Fatima;Deb, Manas Kanti;Shrivas, Kamlesh;Jain, Vikas Kumar;Khan, Noor A.
• 通讯作者: Khan, Noor A.

A modeling approach for soot formation in non-premixed flames with elevated stoichiometric mixture fraction

• DOI: 10.1016/j.combustflame.2021.02.029
• 发表时间: 2021-07
• 期刊: Combustion and Flame
• 影响因子: 4.4
• 作者: Phillip R. Johnson;R. Chakrabarty;B. Kumfer

Correcting for filter-based aerosol light absorption biases at the Atmospheric Radiation Measurement program's Southern Great Plains site using photoacoustic measurements and machine learning

使用光声测量和机器学习纠正大气辐射测量计划南部大平原站点基于过滤器的气溶胶光吸收偏差

• DOI: 10.5194/amt-15-4569-2022
• 发表时间: 2022
• 期刊: Atmospheric Measurement Techniques
• 影响因子: 3.8
• 作者: Kumar, Joshin;Paik, Theo;Shetty, Nishit J.;Sheridan, Patrick;Aiken, Allison C.;Dubey, Manvendra K.;Chakrabarty, Rajan K.
• 通讯作者: Chakrabarty, Rajan K.

Extensive Soot Compaction by Cloud Processing from Laboratory and Field Observations

• DOI: 10.1038/s41598-019-48143-y
• 发表时间: 2019-08-14
• 期刊: SCIENTIFIC REPORTS
• 影响因子: 4.6
• 作者: Bhandari, Janarjan;China, Swarup;Mazzoleni, Claudio
• 通讯作者: Mazzoleni, Claudio

Diel Cycle Impacts on the Chemical and Light Absorption Properties of Organic Carbon Aerosol from Wildfires in the Western United States

• DOI: 10.5194/acp-21-11843-2021
• 发表时间: 2021-08
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: B. Sumlin;Edward Charles Fortner;A. Lambe;Nishit Shetty;C. Daube;Pai Liu;Francesca Majluf;S. Herndon;R. Chakrabarty