| 华北香河站一次霾污染事件的综合观测研究 |
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| 引用本文：夏俊荣,吴 丹,齐 冰,等.华北香河站一次霾污染事件的综合观测研究[J].气象与环境科学,2016,39(2):10-17.Xia Junrong, Wu Dan, Qi Bing, et al.Integrated Observation of a Haze Case over Xianghe Station in Northern China[J].Meteorological and Environmental Sciences,2016,39(2):10-17. |
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| DOI：10.16765/j.cnki.1673-7148.2016.02.002 |
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| 中文摘要:利用激光雷达、太阳光度计、系留气艇低空探测数据及MODIS卫星数据等多源资料，对2007年2月初发生在我国中东部地区的一次大范围霾污染事件进行了综合分析，重点分析了华北香河站垂直向气溶胶光学特性的变化特征，并初步讨论了气溶胶区域输送。分析结果表明：霾污染中心位于大城市、城市群或者盆地等污染物源排放强度大或者地形不利于污染物扩散的地区，形成了6个污染中心；2日霾最严重时，近地面气溶胶消光系数（355 nm）达到1.8 km-1，是霾发生前的3倍；霾最严重时气溶胶光学厚度（340 nm）为1.4，较前后日的高；随着边界层高度的下降，底层气溶胶快速积累；香河站气溶胶在垂直向存在明显的分层现象，上层600—1000 m高度气溶胶受区域输送的影响，其光学厚度占整层气溶胶的比值能达到43.6%，甚至更高；本次霾过程以细粒子为主；弱高压系统、低至100 m左右的逆温层高度及低风速等气象条件对此次霾的形成起到了重要的作用；而3日出现的大风则很可能是驱散霾的重要因子。 |
| 中文关键词:霾 气溶胶 光学特性 激光雷达 垂直分布 |
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| Integrated Observation of a Haze Case over Xianghe Station in Northern China |
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| Abstract:A haze case over Northern China in February 2007 was observed and studied by a synergy of lidar (located in Xianghe Station),sun photometer,tethered balloon and satellite data.The variation of aerosol optical properties in vertical direction at Xianghe station and regional transportation of aerosol was analyzed consequently.The results are as follows.There are six haze pollution centers located in big cities and city clusters (high aerosol emissions) or basins where the terrain go against pollutant dispersion.The aerosol extinction coefficient (355 nm) near surface can reach to 1.8 km-1 in severe haze day,which is twice larger than the day before.The maximum aerosol optical depth (340 nm) during severe day is 1.4,higher than the day before and after.The aerosol near surface accumulates fast as the planet boundary layer (PBL) height decreases.There are obvious stratification phenomenon of aerosols in vertical direction at Xianghe station.The upper layer aerosol (600—1000 m) is affected by regional transportation,and its AOD proportion of the whole layer is 43.6% or even larger.Fine aerosols dominates in this haze event.The weak high pressure system,extreme low temperature inversion height (about 100 m),as well as the weak wind speed all together play important role in the formation of this haze event.The strong wind are most likely the important factor of the haze dissipation. |
| Keywords:haze aerosol optical properties lidar vertical distribution |
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