Severe volcanic effects on stratospheric ozone

1991年6月菲律宾的皮纳图博火山喷发被认为是1990年代最严重的一次喷发，预计这次喷发对全球大气环境造成了很大的扰动。在这项研究中，我们重点研究了对大气化学过程的影响。1992财政年度，在东川对平流层气溶胶进行了激光雷达测量，并于次年继续进行了激光雷达测量，并重新尝试了数据分析。分析表明：1、增强的平流层气溶胶在1991年12月出现衰减，但在1992年夏季再次增强，这第二次增强可能是由于新的火山喷发，而不是动力作用，因为那些天去极化比也增加了。由于第二次喷发，扰动的衰减时间尺度似乎非常长。反硝化作用可能通过增强气溶胶上的非均相反应引起。增强型气溶胶对太阳辐射传输的散射效应可能导致平流层温度升高。综上所述，平流层会发生一些对臭氧的化学影响。然而，需要分析全局数据以便检测。1993年12月进行了气球测量，以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.