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利用风廓线雷达资料对2008年7月-2010年6月的灰霾日进行了分析。结果表明:灰霾有明显的季节变化,不同程度的灰霾主要出现在10月-次年4月份,其他月份出现较少。风速对灰霾的出现与否起着重要的作用,在易出现灰霾的10月-4月中层风速≥10 m/s时不易出现灰霾,此情况约占非霾日的87%,反之则易出现,风速越小,灰霾污染程度越严重。不易出现灰霾的5月-9月除了看中层风速外,还要结合大气边界层高度和天空状况,中层风速较小的情况下,降雨频繁和大气边界层较高时也不易出现灰霾。
Haze days from July 2008 to June 2010 were analyzed using wind profile radar data. The results showed that there was a clear seasonal change in haze. Different levels of haze mainly occurred in October-April of the following year, with less in other months. The wind speed plays an important role in the occurrence of haze or haze, which is not easy to appear when the mid-level wind speed is over 10 m / s in October-April, which accounts for 87% of the non-haze days, on the contrary It is easy to appear, the smaller the wind speed, haze pollution more serious. From May to September, which is not prone to haze, in addition to the mid-level wind speed, it is also necessary to combine the height of the atmospheric boundary layer with the sky condition. When the middle-level wind speed is small, frequent haze is not likely to occur when the rainfall is heavy and the atmospheric boundary layer is high.