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Response to Angel Martin (Reply #25)

Thu Mar 31, 2016, 06:00 AM

27. Volcanic activity?

... a newly-published study by Massachusetts Institute of Technology scientists reveals that relatively small volcanic eruptions may be mitigating the increases in output of greenhouse gases and slow the rate of global warming by as much as half. In fact, the effect of such volcanic activity may help to explain why the pace of warming has decreased in recent years and fallen short of matching the level predicted by the amount of carbon going into the atmosphere.

The paper, published in the journal Geophysical Review Letters, focused on the effect of the aerosol particles that are pumped into the atmosphere. The scientists used balloons, laser radar, and ground-based measurements to calculate the impact.

The scientists discovered that about a dozen modest-sized eruptions worldwide over the past 15 years may have reduced the warming effect of greenhouse gas emissions by about 0.005 to 0.12 degrees Celsius. Over roughly that same time period, the rate of global warming has slowed, though surface temperatures have continued to rise.

Volcanic eruptions spew sulfur dioxide, which in the atmosphere forms tiny droplets of sulfuric acid also known as volcanic aerosols, which can block sunlight. While previous studies have noted that effect from small volcanoes, the new study found that the effect is bigger than previously thought...

/... http://news.discovery.com/earth/global-warming/are-volcanic-eruptions-slowing-global-warming-150112.htm

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