Volcanoes seen as likely trigger for global glaciation
A 10-year string of steady volcanic eruptions may have been the trigger for a massive global cooling event that left much of the Earth encased in glaciers and ice sheets about 771 million years ago.
The eruptions could have spewed so much sulphur dioxide into the atmosphere that the planet’s climate reached a tipping point, resulting in what scientists call ‘snowball Earth,” according to a new study published this month in Geophysical Research Letters. Understanding the natural variability of climate is important to understanding current climate change driven by emission of greenhouse gases. Continue reading “What caused ‘snowball Earth?’”→
New study tracks increase in summertime haze in Colorado wilderness
Longer and hotter droughts and wildfires are polluting the once clear blue skies of the high country in the West, according to new research from the University of Utah.
The study, published this week in the journal Environmental Research Letters, found a link between the severity of drought in the Intermountain West and summertime air quality. Climate projections suggest that drought and wildfire risk will continue to increase in coming decades.
New research tracks aerosols from volcanic eruptions
FRISCO — Sunlight-reflecting particles from relatively small volcanic eruptions may add up to have a significant effect on global temperatures, according to a new climate study that tries to quantify the cumulative impact of aerosols from volcanoes.
According to the research, based on a combination of measurements taken on the ground, in the air and from satellites, small volcanic eruptions that occurred between 2000 and 2013 deflected almost double the amount of solar radiation previously estimated.
‘Human activity has played a significant role in altering the seasonal monsoon rainfall on which billions of people depend’
FRISCO — A 10 percent drop in overall monsoon rainfall in the northern hemisphere during past 50 years is outside the range of natural climate variability, Scottish researchers said after a detailed analysis of weather data.
Researchers starting to take nuanced look at chemical composition of aerosols
FRISCO —Scientists have long known that tiny grains of airborne dust are key players in the formation of rain and snow, driving precipitation patterns across the drought-stricken western U.S. and other areas.
New research suggests that the exact chemical make-up of that dust, including microbes found in it, is the key to how much rain and snow falls from clouds. The information could help better predict rain events, as well as explain how air pollution from a variety of sources influences regional climate in general.