Back-trajectory-based source apportionment of airborne sulfur and nitrogen concentrations at Rocky Mountain National Park

Gebhart, K. A., B. A. Schichtel, W. C. Malm, M. G. Barna, M. A. Rodriguez, and J. L. Collett (2011), Back-trajectory-based source apportionment of airborne sulfur and nitrogen concentrations at Rocky Mountain National Park, Colorado, USA, Atmos. Environ., 45, 621-633.