Abstract A laboratory-based experiment has been carried out to understand the cloud condensation nuclei (CCN) activation of carbonaceous aerosols from various sources of emissions such as combustion of wood, cow dung cake, wood-coal burning and diesel generator (DG). The aerosol particles from DG exhaust found to activate completely to cloud condensation nuclei (CCN) at a higher supersaturation (SS) of 0.9% (100.9% RH). However, the CCN activation was faster in carbonaceous aerosol emission from combustion of cow dung cake, where complete CCN activation of particles was observed at 0.3% SS. Wood burning also showed a faster activation at 0.4% SS, whereas for wood-coal burning, the CCN activation has occurred at 0.7% SS. Organic carbon (OC) was found to be the dominant carbon component in all four emission sources compared to elemental carbon (EC) and black carbon (BC). Among all four combustion emissions, wood-burning had the highest OC/EC ratio (8.35) and the lowest was for DG emissions (2.03). BC mass concentration was higher in DG emissions compared to other emissions for the same number of aerosol particles. The non-refractory aerosol chemical composition analysis showed that organic species dominate inorganic species in all the emissions. The study indicates that the carbonaceous aerosols originating from direct emission sources have the potential to get activated as CCN at high supersaturations.

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来自不同燃烧排放源的碳质气溶胶的 CCN 活化：实验室研究

摘要 为了了解来自各种排放源（如木材燃烧、牛粪饼、木炭燃烧和柴油发电机 (DG)）的碳质气溶胶的云凝结核 (CCN) 活化，已经进行了一项实验室实验。发现来自 DG 排气的气溶胶颗粒在 0.9% (100.9% RH) 的较高过饱和度 (SS) 下完全激活为云凝结核 (CCN)。然而，在牛粪饼燃烧产生的碳质气溶胶排放中，CCN 活化更快，其中在 0.3% SS 下观察到颗粒的完全 CCN 活化。木材燃烧在 0.4% SS 时也显示出更快的活化，而对于木炭燃烧，CCN 活化发生在 0.7% SS。与元素碳 (EC) 和黑碳 (BC) 相比，发现有机碳 (OC) 是所有四种排放源中的主要碳成分。在所有四种燃烧排放中，木材燃烧的 OC/EC 比率最高（8.35），最低的是 DG 排放（2.03）。与相同数量的气溶胶颗粒的其他排放相比，DG 排放中的 BC 质量浓度更高。非耐火气溶胶化学成分分析表明，有机物质在所有排放物中占主导地位。该研究表明，源自直接排放源的碳质气溶胶有可能在高过饱和度下被激活为 CCN。与相同数量的气溶胶颗粒的其他排放相比，DG 排放中的 BC 质量浓度更高。非耐火气溶胶化学成分分析表明，有机物在所有排放物中占主导地位。该研究表明，源自直接排放源的碳质气溶胶有可能在高过饱和度下被激活为 CCN。与相同数量的气溶胶颗粒的其他排放相比，DG 排放中的 BC 质量浓度更高。非耐火气溶胶化学成分分析表明，有机物质在所有排放物中占主导地位。该研究表明，源自直接排放源的碳质气溶胶有可能在高过饱和度下被激活为 CCN。