People living in Colorado, Utah, and other western states in the U.S. often remark that there seem to be a lot more dust storms these days. But is it true? One geology researcher wanted to find out. What she discovered may make you want to get a dust-filtration mask for the coming decade.
Image via USGS
According to a release from the University of Colorado at Boulder:
“Dust storms cause a large-scale reorganization of nutrients on the surface of the Earth,” said Janice Brahney, who led the study as a CU-Boulder doctoral student. “And we don’t routinely monitor dust in most places, which means we don’t have a good handle on how the material is moving, when it’s moving and where it’s going.”
Based on anecdotal evidence, such as incidents of dust coating the snowpack in the southern Rockies and a seemingly greater number of dust storms noticed by Western residents, scientists have suspected that dust emissions were increasing. But because dust has not been routinely measured over long periods of time, it was difficult to say for sure . . .
For the new study, recently published online in the journal Aeolian Research, the research team set out to determine if they could use calcium deposition as a proxy for dust measurements. Calcium can make its way into the atmosphere — before falling back to earth along with precipitation — through a number of avenues, including coal-fired power plants, forest fires, ocean spray and, key to this study, wind erosion of soils.
The amount of calcium dissolved in precipitation has long been measured by the National Atmospheric Deposition Program, or NADP, which first began recording the chemicals dissolved in precipitation in the late 1970s to better understand the phenomena of acid rain.
Brahney and her colleagues reviewed calcium deposition data from 175 NADP sites across the United States between 1994 and 2010, and they found that calcium deposition had increased at 116 of them. The sites with the greatest increases were clustered in the Northwest, the Midwest and the Intermountain West, with Colorado, Wyoming and Utah seeing especially large increases.
You can read more via University of Colorado, and read the full scientific paper via Aeolian Research.