南京市一次连续空气污染过程的气象条件分析

利用空气污染资料、常规气象观测资料、NCEP每6h一次2.5°×2.5°再分析资料及NOAA（美国国家海洋和大气管理局）的GDAS（全球同化数据）资料，对2009年10月16日—30日南京市出现一次连续15d的空气污染过程的天气特征进行诊断分析，同时使用HYSPLIT-4后向轨迹模式对污染物来源进行模拟。结果表明：不利于污染物扩散的大气环流形势和气象要素是造成此次污染的主要原因。南京污染物的来源可以大致分为3类：一类是海上来源；一类是南京本地的局地污染来源；还有一类是北方污染物的输送。这为进一步研究长三角地区城市的空气污染来源和成因提供理论依据。

An Analysis of Weather Condition during A Continuous Air Pollution Process in Nanjing City

Based on the data of air pollution, the conventional observation data, the NCEP (2.5°×2.5°) reanalysis data and the GDAS (Global Data Assimilation System) data from NOAA (National Oceanic and Atmospheric Administration), a continuous air pollution process occurred in Nanjing city during Oct 16, 2009 and Oct 30, 2009 was analyzed, and the pollution source was simulated by backward trajectory analysis method ( Hysplit-4 dispersion model). The results indicated that the synoptic situation and fundamental meteorological elements which went against the diffusion of pollution were the main reason of this continuous air pollution process. The source of pollution in Nanjing city can be classified to three types: one comes from sea; the other comes from the local city; the last one is the transportation from the north. This had provided the theoretical basis for further research of air pollution in the Yangze River Delta cities about its source and origin.