A recent research from a team of the University of Saskatchewan has claimed that presence of aerosols, which are very small droplets of sulphuric acid, in high atmosphere can cool down the temperature. It is believed that aerosols from small volcanic eruptions have the tendency to make changes in the temperature, thereby lowering the temperature.

Though it was earlier believed that there is a need of extreme eruption for aerosols to cross the troposphere, thereby entering the layers of the stratosphere, this study has claimed that small volcanic eruptions can do the same. "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”, said lead researcher Adam Bourassa.

For the research, the team thoroughly examined the June 2011 eruption of the Nabro volcano in Eritrea in northeast Africa and found that the volcano gas and aerosol were actually pushed into the stratosphere, thereby breaking the earlier perception that storms cannot transgress the stratosphere's high layers.

It has been found that aerosols, spotted in the stratosphere, scattered the incoming sunlight, thereby taking away the intensity of the sun light and make the Earth's surface a lot cooler. This is for the first time that any research has been able to prove that volcanic aerosol can make its way into the stratosphere with some other way.