粒子的非球形程度对消光系数的影响研究

利用中国气象局南京综合观测基地的微脉冲激光雷达对南京北郊的气溶胶特性进行了常规的观测,并计算了气溶胶的退偏振比,反演了气溶胶的消光系数,分别得到气溶胶退偏振比及消光系数廓线。分析了不同天气情况下退偏振比和消光系数变化趋势的关系,发现退偏振比和消光系数有一定的相关性,即粒子非球形的程度对其消光的大小有一定的影响。初步探测结果发现:在同一个时刻,晴天和雾霾天时二者变化趋势相同,探测到水云时二者变化趋势相反,探测到冰相云时二者变化趋势相同,研究表明:当探测到气溶胶和冰相云时,粒子的非球形特性越明显其消光系数越大;当探测到水云时,粒子越近似球形其消光系数越大。

Effects of the Degree of Non-Spherical Particles on Extinction Coefficient

The aerosol properties in northern subsurb of Nanjing is measured regularly by micro-pulse lidar of Nanjing comprehensive observation base of China Meteorological Administration.We caculated the depolarization ratio and the extinction coefficient of the aerosol,respectively acquired the profiles of depolarization ratio and extinction coefficient.We analysed the relationship of the variation trend between the depolarization ratio and the extinction coefficient,and we finally found the certain correlation existing between those two factors.Preliminary detection results showed that:at the same time,the variation trends of the two are the same on sunny and haze days,and are also the same when the ice clouds is detected,while the trends are opposite when the water clouds is detected.In other words,when detecting aerosol and ice clouds,particles of the non-spherical feature is apparent,extinction coefficient is larger;when detecting water clouds,particles of the spherical feature is apparent,extinction coefficient is larger.