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Increasing eolian dust deposition in the western United States linked to human activity

February 24, 2008

Mineral aerosols from dust are an important influence on climate and on marine and terrestrial biogeochemical cycles. These aerosols are generated from wind erosion of surface soils. The amount of dust emission can therefore be affected by human activities that alter surface sediments. However, changes in regional- and global-scale dust fluxes following the rapid expansion of human populations and settlements over the past two centuries are not well understood. Here we determine the accumulation rates and geochemical properties of alpine lake sediments from the western interior United States for the past 5,000 years. We find that dust load levels increased by 500% above the late Holocene average following the increased western settlement of the United States during the nineteenth century. We suggest that the increased dust deposition is caused by the expansion of livestock grazing in the early twentieth century. The larger dust flux, which persists into the early twenty-first century, results in a more than fivefold increase in inputs of K, Mg, Ca, N and P to the alpine ecosystems, with implications for surface-water alkalinity, aquatic productivity and terrestrial nutrient cycling.

Publication Year 2008
Title Increasing eolian dust deposition in the western United States linked to human activity
DOI 10.1038/ngeo133
Authors J. C. Neff, A. P. Ballantyne, G. L. Farmer, N. M. Mahowald, C. C. Landry, J. T. Overpeck, T. H. Painter, C. R. Lawrence, Richard L. Reynolds
Publication Type Article
Publication Subtype Journal Article
Series Title Nature Geoscience
Index ID 70209650
Record Source USGS Publications Warehouse
USGS Organization Geosciences and Environmental Change Science Center