Word: pinatubo
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Noyes said that this eclipse was unusualbecause Mt. Pinatubo, which erupted last summerand sent gasses into the atmosphere, blocked outmuch of the sun's blue lights and, therefore, madethe moon's reflection appear redder...
...report in Nature suggests that nature can help the process along. Ozone depletion was expected to be reasonably mild in 1991; instead, it was severe. That year also saw major eruptions by Mount Hudson in Chile and Mount Pinatubo in the Philippines. Volcanoes release enormous amounts of dust. Dust, along with ice crystals, provides surfaces where ozone-destruction chemistry works most efficiently. Unfortunately, while the industrial world is phasing out CFCs before the turn of the century, other compounds are also ozone destroyers -- and volcano control is somewhat farther...
...ecological disaster known as global warming has been put off five years at least, thanks to last year's eruption of Mount Pinatubo. When the Philippine volcano blew its top, it lofted some 20 million tons of sulfur dioxide into the upper atmosphere. Since then, the stuff has circled the globe, forming a layer of droplets floating in the stratosphere, between 19 and 23 km (12 and 14 miles) above the surface. Scientists predicted that the droplets would act as a worldwide sun shield. Satellite measurements are proving they were right: the planet has cooled off about 0.5 degreesC...
...PINATUBO. The full effects of the eruption of Mount Pinatubo in the Philippines last June -- probably the largest volcanic explosion of the 20th century -- are starting to be felt this year. The volcano heaved 20 million tons of gas and ash into the stratosphere, where they formed a global haze that will scatter sunlight and could lower temperatures -- by half a degree Fahrenheit -- for the next three or four years. Smoke from the gulf-war fires, by contrast, never reached the stratosphere and had no measurable effect on the world's weather...
...problem with sorting out these influences is that they interact in complex ways and may, to some extent, cancel each other out. Pinatubo's cooling effects could counteract the warming caused by greenhouse gases, at least over the short term. At the same time, El Nino's warming influence seems to have suppressed the early cooling effects of Pinatubo's global haze...