北京几种景观在2次灰霾过程中的PM_(2.5)监测分析

Several Kinds of Landscape in the Process of Two Complete Ash Haze PM_(2.5) Monitoring and Analysis

对北京几种景观格局在2013年2月18日-2月28日间发生的2次完整的灰霾过程进行了监测,收集了北京环境监测中心、北京市气象台的相关数据并进行了分析,从灰霾的形成、持续与消散阶段进行了数据的整理与分析。提出PM2.5浓度分布的不均匀现象,以及城市景观格局对PM2.5分布与扩散的影响规律,包括:(1)不同城市景观在相同风速、风向等天气条件下其PM2.5浓度值之间存在明显差异;(2)同一城市景观在不同风速、风向等天气条件下其PM2.5浓度值也存在明显差异;(3)城市景观中PM2.5浓度值不均匀现象普遍存在于多种尺度中,包括较小的km及以下级尺度。

Several kinds of landscape pattern in Beijing in February 18, 2013-February 28 day happened 2 times full of gray haze process monitoring, collection of the Beijing environmental monitoring center, the Beijing municipal meteorological sta-tion data and are analyzed, from the ash haze formation, continuous and dissipation during the data collection and analysis.The uneven phenomenon of PM2.5concentration distribution is put forward, and urban landscape pattern on the distribution of PM2.5and the influence law of diffusion, including:(1) the different urban landscape in the same wind speed, wind direction and other weather conditions the obvious differences between PM2.5density;(2) the same urban landscape in different weather conditions, such as wind speed, wind direction the PM2.5level was also obvious difference;(3) in the urban landscape PM2.5level was uneven phenomenon is widespread in various scales, including smaller of km.