NOAA study suggests aerosols might be inhibiting global warming
Baku, June 27 (AZERTAC). A new study led by the U.S, National Oceanic and Atmospheric Administration (NOAA) shows that tiny particles that make their way all the way up into the stratosphere may be offsetting a global rise in temperatures due to carbon emissions. And while scientists cannot yet say with any certainty where exactly the particles are coming from, they are saying that they have confidence that such particles have likely muted global temperature gains by as much as a third of what they would have been. They team, led by John Daniel, a physicist at the NOAA Earth System Research Laboratory (ESRL) in Boulder, CO, has published their results in Science.
The new research has focused on aerosols, the tiny solid or liquid particles that exist in the atmosphere that can affect global temperatures, such as when Mt. Pinatubo in the Philippines, erupted in 1991 causing a worldwide average decrease in temperature of 1 degree Celsius for more than a year. The cooling is not the result of the ash, notes co-author Susan Soloman, but from the sulfur dioxide that is thrust all the way up into the stratosphere, where it oxidizes and adds to the sun reflecting properties of other already existing particles.
The team focused on the most recent decade because of the relative absence of massive volcanic eruptions , giving them a more clear environmental view of how much impact minor volcanic eruptions and human activities have on the amount of aerosols in the atmosphere and thus global temperatures. To find out what was going on, they used both ground based data and information from satellites such as Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (Calipso), to measure the amount of aerosols in the atmosphere and at what altitudes.
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