南京市重点工业源对城市空气质量影响的数值模拟

运用南京大学空气质量数值预报系统，对2005年1月6─7日南京典型天气条件形成的污染过程进行数值模拟，计算分析了重污染发生时的城市污染气象环境和影响因子，同时针对该城市重点工业源区对城市主要空气污染物浓度分布的贡献做了分析.结果表明:重污染状况发生在长时间逆温条件下，尤以6日23:00—7日04:00时逆温最强(强度可达1.25　℃/hm，逆温层厚200　m)，此时风速较小，同时在市区出现较强的气流辐合，在这种气象条件下， NO₂，SO₂和PM₁₀的质量浓度最高.南京市相对封闭的宁镇丘陵地形以及受东郊紫金山的影响，也是造成主城区重污染的重要影响因子之一.南京市城北工业区与主城区毗邻而且污染物排放量较大，在冬季主导风向为东北风时对主城区污染物的浓度具有显著贡献. 

Numerical Simulation Study on the Effect of Major Industrial Sources in Nanjing on Urban Air Quality

Air pollution process during January 6～7, 2005 in Nanjing induced bytypical weather condition was simulated with the Nanjing University City Air Quality Prediction System (NJU-CAQPS). The meteorological environment and the impact of the major industrial sources on the concentrations of NO₂, SO₂, PM10 were simulated, then the impact factors on the heavy pollution were analyzed. The study showed that heavy pollution appeared under a strong temperature inversion; the intensity of the inversion temperature reached the peak at about 1.25 ℃/hm, with the depth of the inversion layer of 200 m, from 23:00 to 04:00 (LST) when thewind speed was small and a strong convergence occurred in the urban area simultaneously. Under the meteorological condition, the concentrations of NO₂, SO₂, PM10 reached their peak values. The relatively closed Ningzhen hilly terrain andthe Zijin Mountain in the east of Nanjing were also the factors that induced the severe pollution in the urban area. The industrial district in the north of Nanjing was close to the urban area and had the large emission, so it had significant contribution to the pollutant concentrations in the urban area when the northeast wind was prevailing in the winter.