Severe volcanic effects on stratospheric ozone

皮纳图博火山的喷发（1991年6月，菲律宾）被认为是1990年最严重的喷发，预计这次喷发在很大程度上扰乱了全球大气环境。在这项研究中，我们专注于对大气化学过程的影响。1992年在丰川进行了平流层气溶胶的激光雷达测量，次年继续进行了激光雷达测量，并尝试了新的数据分析方法。分析表明：1、平流层气溶胶在1991年12月出现衰减，但在1992年夏季又出现增强。2、第二次增强可能是由于新的火山喷发，而不是动力学效应，因为去极化率也增加了。3、第二次火山喷发使扰动的衰减时间尺度变长。反硝化作用可能是通过增强气溶胶的非均相反应引起的。5、平流层温度可能是通过增强气溶胶对太阳辐射传输的散射作用而升高的。1993年12月曾尝试用气球测量来探测火山对臭氧的影响。

The eruption of Mt.Pinatubo (Phillipine, June 1991) is believed to be most serious eruption in 1990', and it is expected that the eruption largely disturved global atmospheric environment. In this research, we focussed on the effects on atmospheric chemical processes. In 1992 FY, lidar measurements on the stratospheric aerosols was made at Toyokawa, and in following year the lidar measuremetns was continued and data analysis was newly tried. The analysis showed following points ;1, The enhanced stratospheric aerosols showed its decay in December 1991, but enhance again in summer 1992.2, This second enhancement is possibly due to new volcanic eruption and not dynamical effect since depolarization ratio also increased those days.3, Decay time scale of the distrubance seems to be extremely long due to the second eruption.4, Denitrification may be caused through heterogeneous reaction on enhanced aerosols.5, Stratospheric temperature may increase through scattering effects of enhanced aerosols on solar radiative transfer.Summarizing those, some chemical effects on ozone will occur in the stratosphere. However it is desired to analize global data in order to detect.Balloon measurements was tried in December 1993 to detect the volcanic effects on ozone.