中文关键词鄂尔多斯新粒子生成(NPF)气象要素气团类型粒径分布 英文关键词Ordosnew particle formation(NPF)meteorological elementair masssize distribution

作者	单位	E-mail
孔祥晨	鄂尔多斯市气象局, 鄂尔多斯 017000 南京信息工程大学气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶-云-降水重点开放实验室, 南京 210044	15147736650m@sina.cn
王红磊	南京信息工程大学气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶-云-降水重点开放实验室, 南京 210044	hongleiwang@nuist.edu.cn
张连霞	鄂尔多斯市气象局, 鄂尔多斯 017000
呼群	鄂尔多斯市气象局, 鄂尔多斯 017000
李瑞锋	鄂尔多斯市气象局, 鄂尔多斯 017000
许彩琴	鄂尔多斯市气象局, 鄂尔多斯 017000

中文摘要 利用宽范围粒径谱仪于2019年8月16至10月4日在鄂尔多斯市观测了10 nm~10 μm气溶胶粒径分布，结合PM（PM_2.5和PM₁₀）、污染气体、气象数据和HYSPLIT模式，分析了新粒子生成（NPF）特征及其主要影响因素.结果表明，观测期间一共出现19次NPF过程，占总观测期间的37.5%.NPF过程中对不同模态气溶胶数浓度日变化的影响不同.NPF使得核模态和爱根核模态气溶胶数浓度急剧增加，但是对积聚模态和粗模态气溶胶数浓度的影响较小.NPF发生时往往温度较高，风速较大，总辐照度较高，RH较低.NPF天PM_2.5、PM₁₀、CO和NO₂的浓度较低，O₃和SO₂浓度较高.40.0%的偏北气团和29.6%的偏南气团可观测到NPF过程.不同气团类型NPF过程中气象要素存在显著差异.南部气团类型NPF过程中风速最小，平均为（2.4±1.5）m·s^-1；RH最高，平均为（48.8±10.8）%；北部气团类型NPF过程中风速最大，平均为（4.2±1.9）m·s^-1；总辐照度最高，平均为（664.5±255.6）W·m^-2；西部气团类型NPF过程中RH最低，平均为（29.8±12.7）%.不同气团类型NPF过程中新粒子的生成速率相差不大，为1.5~1.8cm^-3·s^-1.南部气团类型NPF过程中增长速率最大，为（12.7±13.6）nm·h^-1，是北部气团类型和西部气团类型的1.2倍和1.4倍. 英文摘要 In this study, the aerosol number size distribution in the range of 10 nm-10 μm was collected from August 16 to October 04, 2019 at Ordos using a wide-range particle spectrometer (WPS). Combined with PM (PM_2.5 and PM₁₀), pollution gases, meteorological data, and the HYSPLIT model, the characteristics and impact factors of new particle formation (NPF) were discussed. The results indicated that there were 19 NPF events during the observation period, which have different effects on diurnal variation in aerosol number concentration in different modes. The NPF events caused a sharp increase in the number concentration of nucleation and Aitken mode aerosols, but had little effect on the number concentration of accumulation and coarse mode aerosols. The temperature, wind speed, and total solar radiation during NPF days were usually higher than those in non-NPF days, and the RH during NPF days was lower. On NPF days, the mass concentrations of PM_2.5, PM₁₀, CO, and NO₂ were lower than those on non-NPF days, while the mass concentrations of O₃ and SO₂ were higher. NPF events were observed in 40.0% of northern air masses and 29.6% of southern air masses. There were significant differences in meteorological elements in different NPF event air mass types. The southern NPF event air mass type had the lowest wind speed and the highest RH, with averages of (2.4±1.5) m·s^-1 and (48.8±10.8)%, respectively. The northern NPF event air mass type had the highest wind speed and total solar radiation, with averages of (4.2±1.9) m·s^-1 and (664.5±255.6) W·m^-2, respectively. The western air mass type of NPF event had the lowest RH, with an average of (29.8±12.7)%. The formation rates of new particles in the different air mass types of NPF events were similar, ranging from 1.5 to 1.8 cm^-3·s^-1. The largest growth rate was (12.7±13.6) nm·h^-1 in the southern NPF event air mass type, which was 1.2 times and 1.4 times higher than the NPF events of northern air masses and western air masses.

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