Aged boreal biomass-burning aerosol size distributions from BORTAS 2011
Aged boreal biomass-burning aerosol size distributions from BORTAS 2011
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2011 年 BORTAS 中老化的北方生物质燃烧气溶胶粒径分布
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
J. Pierce
中科院分区：
文献类型：
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作者：
K. Sakamoto;J. Allan;H. Coe;Jonathan W. Taylor;T. Duck;J. Pierce
抽象的。生物质燃烧气溶胶有助于气溶胶对气候系统的辐射强迫。这种影响的大小部分取决于气溶胶粒径分布，这是源火特性（如燃料类型，MCE）和羽流微物理处理的函数。气候模式清单中生物质燃烧排放量-尺度分布的不确定性导致了这些模式得出的云凝结核浓度和强迫估计的不确定性。BORTAS-B（利用飞机和卫星量化北半球森林火灾对大西洋上空对流层氧化剂的影响）测量活动旨在对2011年夏季加拿大东部上空的北半球生物质燃烧流出物进行采样。使用这些BORTAS-B数据，我们实现羽流标准，隔离的特征尺寸分布的年龄生物质燃烧排放量（年龄约1-2天），北部野火在西北部安大略。复合中值粒径分布产生了一个单一的主要积累模式，Dpm = 230 nm（数-中值直径）和σ = 1.5，这与文献中类似类型的其他年龄羽状物的值。b 622航班路径上的有机气溶胶增强比（ΔOA / ΔCO）沿着显示值为0.09-0.17 μg m-3 ppbv-1（按体积计算为十亿分之几），随着距离污染源的距离变化，没有明显的趋势。这种增强率随距离增加/减少的缺乏表明在采样期间（羽流年龄：1-2天），在老化羽流内没有可检测到的OA（有机气溶胶）净产生/蒸发，尽管它不排除OA在早期阶段的产生/损失。拉格朗日微物理模型被用来确定估计的新鲜排放的尺寸分布对应的BORTAS-B老化的尺寸分布。该模型仅限于混凝和稀释过程的基础上微不足道的净OA生产/蒸发来自ΔOA / ΔCO增强比。我们估计，烟羽中位直径在59-94纳米的范围内，模态宽度在1.7-2.8的范围内（范围是由于夹带率的不确定性）。因此，由于羽流稀释率的不确定性，新排放颗粒的大小相对不受约束。
Abstract. Biomass-burning aerosols contribute to aerosol radiative forcing on the climate system. The magnitude of this effect is partially determined by aerosol size distributions, which are functions of source fire characteristics (e.g. fuel type, MCE) and in-plume microphysical processing. The uncertainties in biomass-burning emission number–size distributions in climate model inventories lead to uncertainties in the CCN (cloud condensation nuclei) concentrations and forcing estimates derived from these models. The BORTAS-B (Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellite) measurement campaign was designed to sample boreal biomass-burning outflow over eastern Canada in the summer of 2011. Using these BORTAS-B data, we implement plume criteria to isolate the characteristic size distribution of aged biomass-burning emissions (aged ~ 1–2 days) from boreal wildfires in northwestern Ontario. The composite median size distribution yields a single dominant accumulation mode with Dpm = 230 nm (number-median diameter) and σ = 1.5, which are comparable to literature values of other aged plumes of a similar type. The organic aerosol enhancement ratios (ΔOA / ΔCO) along the path of Flight b622 show values of 0.09–0.17 μg m−3 ppbv−1 (parts per billion by volume) with no significant trend with distance from the source. This lack of enhancement ratio increase/decrease with distance suggests no detectable net OA (organic aerosol) production/evaporation within the aged plume over the sampling period (plume age: 1–2 days), though it does not preclude OA production/loss at earlier stages. A Lagrangian microphysical model was used to determine an estimate of the freshly emitted size distribution corresponding to the BORTAS-B aged size distributions. The model was restricted to coagulation and dilution processes based on the insignificant net OA production/evaporation derived from the ΔOA / ΔCO enhancement ratios. We estimate that the young-plume median diameter was in the range of 59–94 nm with modal widths in the range of 1.7–2.8 (the ranges are due to uncertainty in the entrainment rate). Thus, the size of the freshly emitted particles is relatively unconstrained due to the uncertainties in the plume dilution rates.
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使用飞机和卫星 (BORTAS) 实验量化 BOReal 森林火灾对大西洋对流层氧化剂的影响：设计、执行和科学概述
影响因子：
6.3
作者：
Palmer P
通讯作者：
Palmer P
影响因子：
6.3
作者：
M. Parrington;P. Palmer;A. Lewis;James D. Lee;A. Rickard;P. Carlo;Jonathan P. Taylor;J. Hopkins;S. Punjabi;D. Oram;G. Forster;E. Aruffo;S. Moller;S. Bauguitte;J. Allan;H. Coe;R. Leigh
通讯作者：
M. Parrington;P. Palmer;A. Lewis;James D. Lee;A. Rickard;P. Carlo;Jonathan P. Taylor;J. Hopkins;S. Punjabi;D. Oram;G. Forster;E. Aruffo;S. Moller;S. Bauguitte;J. Allan;H. Coe;R. Leigh
影响因子：
4.4
作者：
Capes, G.;Johnson, B.;Coe, H.
通讯作者：
Coe, H.
影响因子：
6.3
作者：
Franklin, J. E.;Drummond, J. R.;Saha, A.
通讯作者：
Saha, A.