秸秆焚烧导致南京及周边地区2次空气污染事件的成因比较

从天气形势、卫星遥感火点监测、物理量诊断和后向轨迹模拟等方面分析了2008和2010年秸秆焚烧导致南京及周边地区空气污染事件过程的异同点。结果表明,2008年污染过程受大气底层切变线的控制,2010年污染过程受高压天气形势的控制;2008年火点仅出现在江苏地区,而2010年江苏、安徽和浙江地区均有出现;2008年大气底层气流为弱上升运动,导致高浓度的污染,2010年因受下沉气流控制而导致大范围的污染;2008年污染物来源为江苏地区,2010年则受江苏和安徽地区火点的共同影响,这些差异导致2次污染过程影响的范围和强度有所不同。

Contrast Analysis of Two Serious Air Pollution Events Affecting Nanjing and Its Surrounding Regions Resulting From Burning of Crop Residues

Two serious air pollution events resulting from burning of crop residues occurred in 2008 and 2010 affecting Nanjing and its surrounding regions were analyzed on commons and differences in weather situation,satellite remote sensing,physical diagnoses and simulated back trajectories.Results show that the event in 2008 was controlled by shear line in the substratum and the one in 2010 by high pressure in weather;in 2008 the burning took place only in Jiangsu Province,but in 2010 it did in Jiangsu,Anhui,Zhejiang provinces;in 2008,the weak upward current in the substratum led to the high concentration air pollution,while in 2010,the dominance of downdraft made the pollution extensive in area;in 2008,the pollution came from Jiangsu Province,whereas in 2010 it did from Jiangsu and Anhui simultaneously.These differences made the two events different in scope and intensity.