The Stratospheric Impact of the Eruption of Pinatubo

M. McCormick
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Abstract

The eruptions of the Philippine volcano Pinatubo (15.14°N, 120.35°W) in June 1991 caused the largest impact to stratospheric aerosols experienced probably in this century. Early estimates place the SO2 injected to altitudes of at least 30 km at 2 or more times that from the 1982 eruptions of El Chichon. El Chichon put about 6 megatonnes of SO2, or 12 megatonnes of sulfuric acid aerosol, into the lower-to-middle stratosphere making it the largest in the Northern Hemisphere for at least 50 years. An eruption of the magnitude of Pinatubo is important for studies of global change. In particular, its effects to cooling the Earth's surface and possibly masking greenhouse warming must be understood. The heterogeneous chemical effects of this new surface area and the potential for ozone reduction must also be studied. Other potential impacts include the possibility of increased cirrus cloud production and effects of this volcanic layer on producing artifacts in various ground-based and satellite-based remote sensor retrievals. Another effect clearly observed after El Chichon, was the serious crazing of acrylic windows on aircraft flying in polar regions and, therefore, at stratospheric altitudes where aircraft came into contact with the increased sulfuric acid aerosol produced by the El Chichon eruption.
皮纳图博火山喷发对平流层的影响
1991年6月菲律宾Pinatubo火山(15.14°N, 120.35°W)的喷发对平流层气溶胶造成了本世纪可能经历的最大影响。早期的估计认为,注入到海拔至少30公里处的二氧化硫是1982年埃尔奇雄火山喷发时的2倍或更多。El chicchon将大约600万吨二氧化硫或1200万吨硫酸气溶胶排放到平流层的中下层,使其成为至少50年来北半球最大的一次。皮纳图博火山规模的喷发对研究全球变化很重要。特别是,我们必须了解它对地球表面降温和可能掩盖温室效应的影响。还必须研究这一新表面积的不均匀化学效应和臭氧减少的潜力。其他潜在影响包括增加卷云产生的可能性,以及该火山层对各种地基和卫星遥感器检索中产生伪影的影响。在埃尔奇琴火山爆发后,另一个明显观察到的影响是,在极地地区飞行的飞机上的丙烯酸窗户严重破裂,因此,在平流层高度,飞机接触到埃尔奇琴火山爆发产生的越来越多的硫酸气溶胶。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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