摘要
利用激光雷达对2006年6月17日出现浮尘天气进行观测,反演分析浮尘天气气溶胶消光系数特征,并将其消光系数放入LOWTRAN模式中模拟了大气长波冷却率。结果表明:浮尘刚出现时沙尘的消光系数较小,其峰值在地面附近,相应光学厚度也较小。浮尘发展时沙尘的消光系数增大,沙尘粒子慢慢从地面上升至高空,边界层高度达1 500 m左右,边界层内部沙尘气溶胶充分混合,消光系数趋于一致,光学厚度最大达0.41;17日浮尘期间(19:00—23:00),2 200 m以下20:00 h和21:00 h冷却率较其它时刻大,这两个时刻的沙尘浓度也较大;有浮尘时长波冷却率较无浮尘时增加,最大增加值在2 250 m的高度层达到0.04 K/h。
A dust event on 17 June 2006 was observed with a lidar and the characteristics of an aerosol extinction coefficient were analyzed, which was then applied in the Lowtran model to simulate cooling rates of atmospheric longwave. The results indicate that at the initial stage, values of a dust aerosol extinction coefficient were small with the peak value around the surface, and the corresponding optical depth was also relatively shallow. At the developing stage, these values increased and the dust particles gradually rose from the surface to upper air with the boundary layer around 1 500 m. Below the boundary layer, dust aerosols completely mixed, with the extinction coefficient becoming constant and the optical depth reaching a maximum value of 0.41. Between 19：00 and 23：00, aerosol cooling rates below 2 200 m as well as dust concentration showed high values at 20：00 and 21：00. The aerosol cooling rate was higher under the dust condition than that under no-dust condition, with maximum increase of 0.04 K/h occurring in the altitude of 2 250 m.
出处
《热带气象学报》
CSCD
北大核心
2013年第3期458-464,共7页
Journal of Tropical Meteorology
基金
国家自然科学基金项目(40675078)
国家自然科学基金资助项目(41205123)
国家重点基础研究发展规划项目(2006CB400501)
广东省自然科学基金(10151008019000004)共同资助
