利用CALPUFF模型模拟重庆主城区能见度水平

Visibility Trends Investigation in Chongqing Downtown using CALPUFF Model Simulation

利用CALPUFF模型模拟了重庆市主城区能见度分布情况。结果显示4月和7月主城区能见度水平较高,能见度分别为5.2～9.7km和7.5～12.2km,1月和10月能见度水平相对较差,能见度分别为5.4～8.7km和4.3～8.5km。主城区能见度较差的区域主要分布在主城区南北部海拔较高的山地区域。受河谷风的影响,沿江地区的能见度水平有所提高。同时部分地区受局地的山谷风的影响,在局部也会出现能见度水平有所改善。主城区能见度区域分布情况较为明显,能见度变化情况较为复杂。

The authors examined visibility data in Chongqing downtown areas. Trends have been constructed using CALPUFF simulation model. Overall, good visibility events experienced during April and July, with visibility observation from 5.2 km to 9.7 km and 7.5 km to 12.2 km respectively, while for January and October, reduced visibility experienced with observation from 5.4-8.7 km and 4. 348.5 km respectively. The poor visibility events experienced in the high elevation hilly areas , which locate in the northern and southern parts of downtown. The improvement in visibility around the rivers is due to the influence from river valley wind. Besides, the valley wind improves the visibility level in some hilly areas as well. In general, there is distinct spatial variation in visibility, however, the causes for visibility variation are proved to be complex.