Laboratory experiments are conducted to investigate aging of size-classified black carbon (BC)particles from OH-initiated oxidation of *** variations in the particle size, mass, effective density, morphology, optical ...
Laboratory experiments are conducted to investigate aging of size-classified black carbon (BC)particles from OH-initiated oxidation of *** variations in the particle size, mass, effective density, morphology, optical properties, hygroscopicity, and activation as cloud condensation nuclei (CCN)are simultaneously measured by a suite of aerosol instruments, when BC particles produced from incomplete combustion of propane are exposed to the oxidation products of the OH-m-xylene reactions.
利用包含详细微物理动力学机制的NAQPMS+APM(Nested Air Quality Prediction Modeling System with Advanced Particle Microphysics)模式，对北京城市大气2006 年1 月15日至2 月13 日期间的粒子数浓度谱分布进行了模拟，模式模拟结果...
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利用包含详细微物理动力学机制的NAQPMS+APM(Nested Air Quality Prediction Modeling System with Advanced Particle Microphysics)模式，对北京城市大气2006 年1 月15日至2 月13 日期间的粒子数浓度谱分布进行了模拟，模式模拟结果合理，能够很好地再现北京城市大气细粒子的数浓度谱分布演变特征。分析表明，北京冬季大气新粒子形成事件频发，核化作用使核模态粒子数浓度急剧升高;污染累积时，积聚模态粒子数浓度显著增大，而核模态粒子数浓度很小，粒子谱分布向大粒子端移动;重污染期间，粒子微物理混合作用强烈，二次成分在一次粒子上的附着使一次粒子粒径显著增大，二次成分可使一次粒子粒径增大50％以上，积聚模态的二次粒子与一次粒子共同促进了污染的形成。在北京及其近周边区域，北京南部和河北南部一次粒子数量多，占据主导地位，而在河北北部二次粒子则占主导地位。
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