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中文摘要：
利用南宁城区地面观测站的常规观测数据、欧洲中期天气预报中心ECMWF的ERA-Interim再分析资料、以及南宁全市逐日环境监测数据,对一次中等霾天气过程进行分析。结果表明：此次霾过程主要是由地面受冷高压控制导致长时间段无降水而引起的,在无有利扩散条件的情况下,PM2.5的浓度呈线性增长趋势,当空气质量达到中度污染时,就可能出现霾;较弱的低层风和近地面逆温层都能够加大PM2.5的堆积速度;在无降水但低层和地面风速有一定加大的情况下,PM2.5浓度只是浮动维持在某一数值,而不是呈现明显下降的趋势;中雨及以上的降水天气过程能够快速地降低空气中的PM2.5,结束霾天气过程。
英文摘要：
Based on the conventional observation data and the ERA-Interim reanalysis data and daily Nanning city＇s environmental monitoring data, a moderate haze process was analyzed. The results show that： this haze process caused by long-time control of the ground cold high, which led to a long period of no precipitation, in the absence of favorable diffusion conditions, the concentration of PM2.5 increases linearly, when air quality reaches moderate pollution level, it could occur haze; weak low-level winds and near-surface inversion layer can increase the deposition rate of PM2.5; in the absence of precipitation,but increasing of the ground wind speed, PM2.5 concentration just maintained at a certain value, instead of showing a clear downward trend; moderate and above rain can quickly reduce the PM2.5 in air and end the haze process.
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