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首页> 外文期刊>Atmospheric chemistry and physics >Effects of near-source coagulation of biomass burning aerosols on global predictions of aerosol size distributions and implications for aerosol radiative effects
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Effects of near-source coagulation of biomass burning aerosols on global predictions of aerosol size distributions and implications for aerosol radiative effects

机译：生物质燃烧气溶胶近源凝血对气溶胶尺寸分布的全球预测的影响及气溶胶辐射效应的影响

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Biomass burning is a significant global source of aerosol number and mass.In fresh biomass burning plumes, aerosol coagulation reduces aerosol number and increases the median size of aerosol size distributions, impacting aerosol radiative effects.Near-source biomass burning aerosol coagulation occurs at spatial scales much smaller than the grid boxes of global and many regional models.To date, these models have ignored sub-grid coagulation and instantly mixed fresh biomass burning emissions into coarse grid boxes.A previous study found that the rate of particle growth by coagulation within an individual smoke plume can be approximated using the aerosol mass emissions rate, initial size distribution median diameter and modal width, plume mixing depth, and wind speed.In this paper, we use this parameterization of sub-grid coagulation in the GEOSChem–TOMAS (TwO-Moment Aerosol Sectional) global aerosol microphysics model to quantify the impacts on global aerosol size distributions, the direct radiative effect, and the cloud-albedo aerosol indirect effect.We find that inclusion of biomass burning sub-grid coagulation reduces the biomass burning impact on the number concentration of particles larger than 80 nm (a proxy for CCN-sized particles) by 37% globally.This cloud condensation nuclei (CCN) reduction causes our estimated global biomass burning cloud-albedo aerosol indirect effect to decrease from -76 to -43mWm~(-2).Further, as sub-grid coagulation moves mass to sizes with more efficient scattering, including it increases our estimated biomass burning all-sky direct effect from -224 to -231mWm~(-2), with assumed external mixing of black carbon and from -188 to -197m Wm~(-2) and with assumed internal mixing of black carbon with core-shell morphology.However, due to differences in fire and meteorological conditions across regions, the impact of sub-grid coagulation is not globally uniform.We also test the sensitivity of the impact of sub-grid coagulation to two differe
机译：生物量燃烧是气溶胶数量和质量的重大全球来源。在新的生物量燃烧羽毛中，气溶胶凝固可减少气溶胶数量并增加气溶胶尺寸分布的中值，影响气溶胶辐射效应。在空间尺度时燃烧气溶胶凝血的燃烧气溶胶凝固。比全球和许多区域模型的网格盒小得多。迄今为止，这些模型忽略了次栅凝固，瞬间将新的生物量燃烧排放到粗网箱中。以前的研究发现，粒子生长速率在一个内单个烟雾羽毛可以近似使用气溶胶批量排放速率，初始尺寸分布中值和模态宽度，羽流混合深度和风速。在本文中，我们在地质划线上使用了该子网格凝固的这个参数化（两个 - 气溶胶截面）全局气溶胶微物质模型量化对全球气溶胶尺寸分布，目录的影响辐射效果，云-Perbedo气溶胶间接效果。我们发现将生物质燃烧的子网格凝固凝固减少了对大于80nm的颗粒数量浓度的生物质燃烧的影响（CCN大小颗粒的代理）全球百分比。云凝结核（CCN）减少导致我们估计的全球生物量燃烧云-213mWm〜（-2）减少到-76至-43mWm〜（-2）。与亚网凝固一起移动质量尺寸高效散射，包括它增加了估计的生物质从-224到-231mwm〜（-2）燃烧的全天直接效应，假设的黑碳和-188至-197m wm〜（-2）和假设黑碳与核壳形态的内部混合。然而，由于区域的火灾和气象条件的差异，子网格凝结的影响不是全球均匀的。我们还测试了子网凝血的影响的敏感性两个differe

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