基于激光雷达的宁波地区气溶胶垂直分布特征研究
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引用本文:胡晓,张国超,林陈爽,等.基于激光雷达的宁波地区气溶胶垂直分布特征研究[J].气象与环境科学,2019,42(2):74-81.Hu Xiao1,Zhang Guochao1,Lin Chenshuang1,Jiang Mingtao2,Zhang Hongsheng2,Hu Rong2.Characteristic Study on Vertical Distribution of Aerosols at Ningbo Based on Lidar[J].Meteorological and Environmental Sciences,2019,42(2):74-81.
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胡晓,张国超,林陈爽,等  
DOI:doi:10.16765/j.cnki.1673-7148.2019.02.011
基金项目:
中文摘要:利用2016年宁波逐时气象观测资料、大气成分监测资料及气溶胶激光雷达资料,对宁波地区霾日进行判定,并对不同天气状况下气溶胶垂直分布特征进行分析。结果表明:2016年宁波地区霾日共70天,轻微霾最多为54天。气象要素和颗粒物浓度在霾日和非霾日都有明显日变化特征,除风速以外,能见度、PM2.5和PM10在霾日和非霾日有非常显著的差异。霾日和非霾日均在高度为0.00.5 km时,气溶胶消光系数最大,贡献率分别为53.3%和40.5%。不同季节气溶胶消光系数变化范围有明显差异,消光系数在霾日秋季的>冬季的>春季的;非霾日冬季的>秋季的>春季的>夏季的。秋冬季多冷空气活动,多污染物输送造成霾日消光系数明显高于非霾日的,秋季两者消光系数峰值差异达0.47 km-1。夜间到早晨由于扩散条件不利,容易有污染物的积累增长。春季轻微霾在02时前后消光系数最大,可达2.9 km-1;轻度霾08时在1.4 km处的最大,可达2.8 km-1。秋季轻微霾在0.5 km以下,02时、08时有消光系数峰值区,最大可达1.0~1.2 km-1。冬季多静稳天气,扩散条件较差,气溶胶消光系数日变化规律不明显,随着霾程度的加重,消光系数波动幅度增大,无霾或轻微霾时消光系数为0.0~1.0 km-1,轻度和中度霾时,消光系数峰值从1.2 km-1增大到2.2 km-1。
中文关键词:  气溶胶  消光系数  垂直分布
 
Characteristic Study on Vertical Distribution of Aerosols at Ningbo Based on Lidar
Abstract:Using the hourly meteorological data,concentration data of pollutants and aerosol Lidar data in the area of Ningbo in 2016,the haze days in Ningbo was identified and the vertical distribution characteristic of aerosols under different weather conditions was analyzed. The result showed that in 2016,there were a total of 70 haze days including 54 light haze days,which was the most. Meteorological elements and particulate matter concentration showed obvious daily variation in haze days and non haze days. Except wind speed,the visibility,PM2.5 and PM10 all experienced significant difference in days with haze or not. Both haze and non haze day there were the largest aerosol extinction coefficient in 0.00.5 km height with the contribution rate of 53.3% and 40.5%. The variation range of aerosol extinction coefficient showed obvious difference in different seasons. The extinction coefficient order in haze days was autumn>winter>spring,in non haze days was winter>autumn>spring>summer. The extinction coefficient in haze days was apparently higher than that in non haze days with a extinction coefficient peak difference of 0.47 km-1 in autumn due to the multi pollutant transport,which was caused by the increasing cold air activity in autumn and winter. During the time from night to morning,the pollutant increased significantly because of the unfavorable condition for air diffusion. In spring,the extinction coefficient of slight haze could be up to 2.9 km-1 around 2 am;and that of light haze could be up to 2.8 km-1 in 1.4 km at 8 am. In autumn,light haze presented extinction coefficient peaks at 2 am and 8 am below 0.5 km with the maximum of 1.01.2 km-1. As for winter,the air diffusion condition was poor because of the stable weather. Thus,the daily change of aerosol extinction coefficient was not obvious. The fluctuation amplitude of extinction coefficient increased along with the aggravation of the haze. Extinction coefficient was in 0.01.0 km-1 in non haze and slight haze days while the peak increased from 1.2 km-1 to 2.2 km-1 in light and moderate haze days.
Keywords:haze  aerosol  extinction coefficient  vertical distribution
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