| 成都夏季气溶胶消光特性研究 |
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| 引用本文： | 巫俊威,罗磊,杨东,等.成都夏季气溶胶消光特性研究[J].高原山地气象研究,2018,38(3):72-79. |
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| 作者姓名： | 巫俊威 罗磊 杨东 等 |
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| 作者单位： | 1. 四川省成都市气象局, 成都 611130; |
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| 基金项目： | 成都市科技治霾创新项目"应用冷却技术人工影响逆温层的研究与试验 |
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| 摘 要： | 本文利用成都2017年6~8月的米散射微脉冲激光雷达观测数据,对成都夏季气溶胶消光系数、边界层高度以及气溶胶光学厚度进行了反演,并结合太阳光度计观测资料、地面颗粒物浓度以及大气能见度数据研究了气溶胶消光系数日变化与月变化规律,气溶胶消光系数的垂直分布特征及影响因素。结果表明:气溶胶消光系数的日变化受人类活动以及边界层日变化影响显著,表现出凌晨与傍晚最大,早晨次之,午后最小的特征。消光高值出现在200m以下和300~700m的高度区间,夜间观察到的消光高值可能与颗粒物在夜间近地面浓度较高以及本地夜间降水频发有关。激光雷达反演的消光系数与光度计反演的气溶胶光学厚度在夏季各月的表现一致,夏季各月消光极值均出现在100~150m的近地面层。近地面消光系数与地面颗粒物浓度之间具有较好的正相关,并且粒子粒径更小时相关性更好。气溶胶光学厚度主要来自低层大气的贡献,0.1~0.2μm的细粒子气溶胶占比对于大气消光有主要影响,但气溶胶对大气的消光影响除了与粒子浓度有关,还与粒子的理化性质有关。
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| 关 键 词： | 激光雷达 气溶胶消光系数 气溶胶光学厚度 |
| 收稿时间： | 2018-07-29 |
Research on Characteristics of Aerosol Extinction in Summer of Chengdu |
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| Institution: | 1. Chengdu Meteorological Bureau, Chengdu 610000, China;2. Chengdu Plateau Meteorological Research Institution, China Meteorological Administration, Chengdu 610031, China |
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| Abstract: | The Aerosol Extinction Coefficient, Atmospheric Boundary Layer, Aerosol Optical Depth in summer of Chengdu were retrieved by making use of the observed data from Meter scattering micro-pulse Laser Radar in Chengdu, June-August2017, and the law of daily and monthly changes of aerosol extinction coefficient, distribution characteristics and influencing factors of Aerosol extinction coefficient were studied combining with the sun photometer observations, Surface particulate concentration and atmospheric visibility data. The results showed that the daily variation of the aerosol extinction coefficient wassignificantly affected by human activities and the daily variation of Atmospheric Boundary Layer, which exhibited the peak emerging before dawn and sunset, the second in the morning and the smallest in the afternoon. The high value of extinction was found in the near strata below 200 m and 300 m—700 m, and the observed high value of extinction at night may be related to the daily variation of particulate concentration and the relatively higher probability of local night precipitation. The Extinction coefficient inversed by Lidar consistent with the AOD inversed by photometer on each month in summer, with the extinction extreme values of each month appeared in near-surface layer of 100 m—150 m. The near-surface extinction coefficient had a better correlation with the concentration of ground particles, and the particles size the smaller and the correlation was better. The Aerosol optical thickness mainly came from the contribution of the lower atmosphere, and the Aerosol optical thickness of 0. 1—0. 2 microns mainly influenced the atmospheric extinction, however, extinction effect of aerosol in the atmosphere not only related to the particle concentration, but also related to the physical and chemical properties of particles. |
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