摘要
2013年3月4—9日上海地区出现了一次连续6 d的污染过程,本文利用PM_(2.5)和PM_(10)的小时监测资料、常规气象资料、激光雷达资料、FY-3A卫星监测资料及NCEP再分析资料,综合探讨了此次连续污染过程的气象特征,发现此次连续污染与天气形势的高低空配置有密切关系,槽后被西北气流控制,稳定的垂直层结及地面较弱的气压场,有利于污染物的积聚和污染天气的维持。文章还对此次连续污染过程中的重污染过程进行了深入的诊断分析,研究发现850 hPa及以上中低空西北气流将上游污染物输送至上海,再配合下沉运动沉降到地面,是造成此次重度污染过程的主因;同时,本地风力小、近地层垂直温度层结稳定等均不利于污染物在水平和垂直方向上的扩散,为污染物的积聚创造了条件。
A continuous air pollution event which occurred in Shanghai during 4-9 March 2013 was inves- tigated. The main features of air pollution transportation and formation were preliminary discussed by using the hourly observation data of PM2.5 and PM10, conventional weather data, data from the ground- based Micro Pulse Lidar （MPL_4B）, data from FY-3A satellite and NCEP （1°× 1°） reanalysis data. The results show that the pollution event was mainly influenced by the weather condition in upper and lower levels. The northwest wind after the trough, the stable stratification and the weak pressure field made air pollutants difficult to disperse. The northwest wind at 850 hPa could transport the dust to Shanghai, and then the dust subsided to the ground surface. The faint wind and the stable temperature stratification near the surface provided favorable conditions for the formation and maintenance of the heavy pollution event.
出处
《气象》
CSCD
北大核心
2016年第2期203-212,共10页
Meteorological Monthly
基金
中国气象局预报员专项(CMAYBY2014-022)
上海市科研计划项目(14DZ1202904)
上海市气象局科技开发项目(MS201212)共同资助
