1998～2001年合肥地区平流层臭氧浓度垂直廓线变化特征

Variation of Stratospheric Ozone Profiles Over Hefei during 1998～2001

L625紫外差分吸收(UV-DIAL)激光雷达主要用于18～45 km高度范围内平流层臭氧浓度垂直分布的长期监测.位于合肥郊区的这一台激光雷达自1996年8月全面建成并投入正常运行以来,进行了长期的连续观测,积累了大量宝贵资料。通过分析L625紫外差分吸收激光雷达在1998～2001年期间的平流层臭氧观测数据,得出了合肥上空平流层臭氧浓度垂直分布的特征:平均垂直浓度分布的峰值点高度为23.32 km,峰值点的臭氧浓度为4.43×10^(12)cm^(-3),柱含量6.4×10^(18)cm^(-2);臭氧浓度有明显的一年周期震荡,表现为季节变化:平流层中上层臭氧浓度夏季高冬季低;平流层下层臭氧浓度夏季低冬季高。平流层臭氧浓度峰值高度的变化特征为夏季高冬季低。

L625 UV-DIAL lidar acquired lots of stratospheric ozone data during 1998-2001. Through analysis of these data, some characteristics of stratospheric ozone profiles over Hefei were given. The altitude of peak density of average ozone profile is 23.32 km, and the averaged ozone peak density is 4.43× 1012cm^-3. The column abundance is 6.4× 1018cm^-2. The variation of ozone density is of an obvious one year cyclic vibration, shown as the seasonal variation. The ozone density in middle and upper stratosphere is larger in summer than in winter. In lower stratosphere, ozone density is larger in winter than in summer. The average altitude of peak ozone density is lower in winter than in summer.