Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume
Optical and Chemical Analysis of Absorption Enhancement by Mixed Carbonaceous Aerosols in the 2019 Woodbury, AZ, Fire Plume
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2019 年亚利桑那州伍德伯里火羽流中混合碳质气溶胶增强吸收的光学和化学分析
DOI：
10.1029/2020jd032399
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Carrico, Christian M.
中科院分区：
文献类型：
--
作者：
Lee, James E.;Dubey, Manvendra K.;Aiken, Allison C.;Chylek, Petr;Carrico, Christian M.
野火释放出光吸收气溶胶（包括黑碳和棕色碳，分别为BC和BrC）和更纯粹的散射有机气溶胶（OA）的混合物。BC，BrC和OA的相互作用是复杂的和动态的，并在大气中的老化导致其辐射强迫的大的不确定性的演变。我们报告的微物理，光学和化学测量的多个羽流从伍德伯里火（AZ，美国）在洛斯阿拉莫斯，新墨西哥州，经过11-18小时的大气过境。这包括羽流几乎没有夹带的时期，以及与背景气溶胶混合后变得更加稀释的时期。在870 nm处，气溶胶质量吸收截面（MAC）比裸BC大1.5-2.2倍，这表明在核壳形态之后通过非吸收涂层进行透镜化。在450 nm处1.9-5.1的较大MAC增强因子大于核壳形态可以解释的，并且归因于BrC。在450 nm处，OA的MAC（MAC 10）在羽流的完整部分中最大（峰值在0.6和0.9 m2/g之间），并随着羽流稀释而降低。我们报告了涂层和散装OA的MAC 10（450 nm）与fC2 H4 O2（左旋葡聚糖样物质的示踪剂）之间的强相关性，表明伍德伯里火灾中的BrC与左旋葡聚糖（一种主要气溶胶）共同排放。fC_2H_4O_2和MACl_3（450 nm）在羽流的边缘和核心之间变化，表明在羽流边缘附近OA氧化和BrC漂白增强。我们的过程级发现可以为气候模型中野火羽流的混合BC，BrC和OA属性的参数化提供信息。
Wildfires emit mixtures of light‐absorbing aerosols (including black and brown carbon, BC and BrC, respectively) and more purely scattering organic aerosol (OA). BC, BrC, and OA interactions are complex and dynamic and evolve with aging in the atmosphere resulting in large uncertainties in their radiative forcing. We report microphysical, optical, and chemical measurements of multiple plumes from the Woodbury Fire (AZ, USA) observed at Los Alamos, NM, after 11–18 hr of atmospheric transit. This includes periods where the plumes exhibited little entrainment as well as periods that had become more dilute after mixing with background aerosol. Aerosol mass absorption cross sections (MAC) were enhanced by a factor of 1.5–2.2 greater than bare BC at 870 nm, suggesting lensing by nonabsorbing coatings following a core‐shell morphology. Larger MAC enhancement factors of 1.9–5.1 at 450 nm are greater than core‐shell morphology can explain and are attributed to BrC. MAC of OA (MACOrg) at 450 nm was largest in intact portions of the plumes (peak value bounded between 0.6 and 0.9 m2/g [Org]) and decreased with plume dilution. We report a strong correlation between MACOrg(450 nm) with the fC2H4O2(a tracer for levoglucosan‐like species) of coatings and of bulk OA indicating that BrC in the Woodbury Fire was coemitted with levoglucosan, a primary aerosol. fC2H4O2and MACOrg(450 nm) are shown to vary between the edge and the core of plumes, demonstrating enhanced oxidation of OA and BrC bleaching near plume edges. Our process‐level finding can inform parameterizations of mixed BC, BrC, and OA properties for wildfire plumes in climate models.
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