摘要
针对2014年2月13日Kelud火山喷发,利用星载激光雷达资料计算分析了后向散射系数、退偏振率和双波长比等光学参量,并与喷发前2011~2013年和喷发后2014年3月17日的资料进行对比,以展示火山喷发对平流层光学性质的影响。结果显示:激光雷达监测数据能有效反映平流层在火山喷发前后的光学性质变化;火山喷发后平流层后向散射系数显著增大;相应高度和区域内,退偏振率小于此前3年平均,而双波长比偏大,意味着火山灰气溶胶层由球形性较好、尺度较大的气溶胶粒子组成;不同地点的相似光学性质,意味着火山灰气溶胶粒子在喷发后向南移动,进而反映出平流层物质的运动特征。
The cloud-aerosol lidar with orthogonal polarization （CAL1OP） remote sensing data has been used in the paper to analyze the eruption of Kelud（ February 13, 2014）, and it has also been compared with the 3-year statistics during 2011-2013 and the observation in March 17 after eruption, showing the sudden increase in the stratospheric aerosol con-tent after injection and its subsequent decline. Calculation results show that the optical properties of the stratospheric aerosol layer can be reflected effectively by laser radar monitoring data before and after the eruption. The backscattering coefficient of the stratosphere is greatly increased after the volcanic eruption. The depolarization ratio is less than the previous 3-year average in the corresponding heights and areas, while the dual wavelength ratio is larger, which means that the volcanic ash aerosol layer is formed by aerosol particles that are in better spherical shape and larger size. Similar optical properties of different locations mean that the volcanic ash aerosol particles move southward after eruption, and movement characteristics of the stratospheric can be reflected then.
作者
蔡宏珂
郑泽华
陈权亮
冯晓
CAI Hong-ke, ZHENG Ze-hua, CHEN Quan-liang, FENG Xiao(Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, College of Atmospheric Sciences, Chengdu University of In- formation Technology, Chengdu 610225, China)
出处
《成都信息工程大学学报》
2018年第5期572-578,共7页
Journal of Chengdu University of Information Technology
基金
国家自然科学基金资助项目(41405031
41475037)
公益性行业(气象)科研专项项目资助项目(GYHY201506013)
关键词
大气物理学与大气环境
气溶胶
Kelud火山
后向散射
退偏振率
双波长比
atmospheric physics and atmospheric environment
aerosol
Kelud volcano
attenuated backscatter
depolar-ization ratio
color ratio
