Small and trivial volcanic explosions have the capability of discharging a large number of aerosols freely into the environment to influence temperatures worldwide. Earth’s atmosphere is laden with aerosols like dust, smoke, pollen, micro organisms, ashes and a lot more. The volcanic eruptions boost the most commonly found aerosols–the clouds, which are waiting to spray the water droplets they carry, all around.
The scientists were under the impression that only a gigantic vigorous explosion could infuse the aerosols into the stratosphere-the layer of atmosphere preceding the troposphere. Adam Bourassa, from the University of Saskatchewan Institute of Space and Atmospheric Studies stated “If an aerosol is in the lower atmosphere, it's affected by the weather and it precipitates back down right away.”
"Once it reaches the stratosphere, it can persist for years, and with that kind of a sustained lifetime, it can really have a lasting effect."
The reduction in temperatures and cooling of the areas is caused due to the dispersion of the sunlight. The colossal eruption of Philippine’s Mt. Pinatubo in 1991, had globally trimmed down the temperature by about half a degree momentarily.
In June 2011, the Nabro Volcano in Eritrea in Northeastern Africa erupted with force and sprayed volcanic gases and minuscule drops of sulfuric acid (aerosol) in the way of the Asian annual summer monsoon rains. This explosion became the cynosure of the eyes of the research teams.
Troposphere is the chaotic and tumultuous layer lying nearest to the earth’s surface. The stratosphere has been understood to be an impenetrable hurdle for the storms. It was assumed that the horizontal anvil shape at the thunderstorms’ peak is in actuality the storm hitting hard against a wall. But the Nabro eruption proved else. As the volcanic turmoil settled the rain laden monsoons carried the expelled gases and liquid droplets deep up to the stratosphere.
The Swedish satellite Odin carrying the Canadian Space Agency’s OSIRIS apparatus identified these aerosols, that were labeled as the biggest stratospheric aerosol load documented in more than 10 years of the OSIRIS’s working.
Co-author Alan Robock of the study feels "We've shown for the first time that volcanoes don't have to have enough power to pump the gases into the stratosphere directly during the eruption," Robock claimed. A "perfect storm" combination of weather pattern coming together with an eruption is the thing that can lead to this phenomena. "It has to be at the right time at the right place," felt Robock.