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中文摘要：
2007年冬季南京雾外场试验获得了雾霾转换过程的大气气溶胶和雾滴尺度谱分布同步观测资料,根据能见度和含水量将雾霾过程划分为雾、轻雾、湿霾、霾4个不同阶段,进而分析了不同阶段粗、细气溶胶粒子的微物理特征.结果表明,4个阶段的主要发生顺序为霾←→轻雾—→湿霾—→雾—→湿霾—→轻雾←→霾,雾前湿霾阶段持续时间长于雾后.尺度〉2μm的粗粒子数浓度、表面积浓度和体积浓度在雾阶段均显著大于其他3个阶段,其中霾阶段浓度最低.雾滴表面积浓度和体积浓度尺度谱分布为双峰或多峰型,而轻雾、湿霾和霾阶段粗粒子谱均为单峰型.尺度〉0.010μm的细粒子表面积浓度谱形在雾和湿霾阶段、轻雾和霾阶段分别相似,雾和湿霾阶段数浓度占优势的尺度范围分别为0.04～0.13μm和0.02～0.14μm,轻雾及霾阶段数浓度优势粒子尺度范围均为0.02～0.06μm.从霾、轻雾、湿霾到雾的转换过程中,以0.060～0.090μm为界,小粒子减少,大粒子增多.雾霾演变过程中气溶胶粒子数浓度与均方根直径呈显著负相关关系,雾阶段气溶胶粒子数浓度最低、平均尺度最大.
英文摘要：
Intensive field observations of fog/haze events,including simultaneous measurements of aerosol particle and fog droplet size distributions,were conducted in Nanjing in November,2007.Four weather conditions （fog,mist,wet haze and haze） were distinguished based on visibility and liquid water content firstly.Then,the microphysical characteristics of coarse and fine particles in each condition were investigated.The results showed the dominant sequence of the four weather conditions was haze←→mist → wet haze → fog→ wet haze → mist←→haze.The lasting time of pre-fog wet haze was longer than that of post-fog wet haze.The number,surface area and volume concentration of coarse particles with diameter larger than 2.0 micron in fog were much higher than those in the other three conditions,and the smallest concentrations were observed in haze.The size distributions of surface area and volume concentration exhibited multi-peak in fog droplets,while it showed single peak for coarse particles in haze,mist and wet haze.For the fine particles with diameter larger than 0.010 μm,the spectral shapes of surface area concentration are similar in fog （mist） and wet haze （haze） condition.The dominant size ranges of fine particle number concentration were in 0.04-0.13 μm and 0.02-0.14 μm for fog and wet haze,separately.The same dominant size ranges located in 0.02-0.06 μm for both mist and haze.During the transition processes from haze,mist and wet haze to fog,the concentration of smaller particles （less than 0.060-0.090 μm） reduced and vice versa for the corresponding larger particles.Temporal variation of aerosol number concentration correlated well with the root mean diameters negatively during the observation period.The number concentration of aerosol was the lowest and the mean diameter was the largest in fog periods.
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