Light Absorption Enhancement of Black Carbon Aerosol Constrained by Particle Morphology,Environmental Science & Technology

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Light Absorption Enhancement of Black Carbon Aerosol Constrained by Particle Morphology
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-05-29 , DOI: 10.1021/acs.est.8b00636
Yu Wu ₁ , Tianhai Cheng ₁ , Dantong Liu ₂ , James D. Allan _{2,

3} , Lijuan Zheng ₄ , Hao Chen ₁

Affiliation

The radiative forcing of black carbon aerosol (BC) is one of the largest sources of uncertainty in climate change assessments. Contrasting results of BC absorption enhancement (E_abs) after aging are estimated by field measurements and modeling studies, causing ambiguous parametrizations of BC solar absorption in climate models. Here we quantify E_abs using a theoretical model parametrized by the complex particle morphology of BC in different aging scales. We show that E_abs continuously increases with aging and stabilizes with a maximum of ∼3.5, suggesting that previous seemingly contrast results of E_abs can be explicitly described by BC aging with corresponding particle morphology. We also report that current climate models using Mie Core–Shell model may overestimate E_abs at a certain aging stage with a rapid rise of E_abs, which is commonly observed in the ambient. A correction coefficient for this overestimation is suggested to improve model predictions of BC climate impact.

中文翻译：

受颗粒形态限制的黑碳气溶胶的光吸收增强

黑碳气溶胶（BC）的辐射强迫是气候变化评估中最大的不确定性来源之一。通过现场测量和模型研究估算了老化后BC吸收增强的对比结果（E _abs），这导致了气候模型中BC太阳吸收的模棱两可参数化。在这里，我们使用由BC在不同衰老尺度下的复杂粒子形态参数化的理论模型来量化E _abs。我们显示，随着年龄的增长，E _abs持续增加并稳定，最大值约为3.5，这表明E _abs以前看似对比的结果可以通过BC老化以及相应的颗粒形态来明确描述。我们还报告说，当前使用Mie Core-Shell模型的气候模型在某个老化阶段可能会高估E _abs，而E _abs会迅速增加，这在环境中通常会观察到。提出了针对这种高估的校正系数，以改善对不列颠哥伦比亚省气候影响的模型预测。

更新日期：2018-05-30

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