基于微脉冲激光雷达的上海浦东地区不同强度霾研究

利用微脉冲激光雷达(MPL)对上海浦东2008年12月1日至2010年11月31日期间连续观测的霾期间气溶胶的消光特性进行分析,讨论了上海浦东地区不同强度霾和无霾时气溶胶的垂直分布日变化与季节变化.结果表明,重、中度霾的气溶胶主要分布在500m以下,小时平均消光系数值在0~1.2km-1范围内波动;轻度霾及轻微霾时段,小时平均消光系数波动范围约在0~0.5km-1;无霾时段小时平均消光系数波动范围约在0~0.2km-1;中-重度霾时段消光系数春>冬>夏>秋;夏季低层大气消光较大,春季高层大气消光较大,冬秋两季随高度增加消光逐渐减小;夏冬两季较易发生中、重度霾.

Study of haze with different intensity categories at Pudong District in Shanghai based on micro-pulse lidar

The diurnally and seasonally vertical distribution of the extinction coefficient of haze with different intensity categories were analyzed and discussed using the observation from December 2008 to November 2010 from the Micro-Pulse Lidar and seven-elements automatically observational weather station at the Shanghai Urban Environment Meteorology Center. The aerosols mainly existed below 0.5km in height when severe haze occurred. The hour-average extinction coefficient for severe haze, mild haze and non-haze ranged from 0 to 1.2, 0 to 0.5 and 0 to 0.2 km-1 respectively. During daytime, the aerosol concentration became highest at noon and lowest in the afternoon and the aerosol layer rose from morning to afternoon and declined in the evening. The mean extinction coefficient for severe haze days varied ranging from the largest to the fewest in spring, winter, summer and autumn sequently. In summer the high extinction coefficient occurred at low-level atmosphere and in spring just the opposite.