Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA

Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA

Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO 80523, USA

Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523, USA

Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA

National Snow and Ice Data Center, University of Colorado, Boulder, CO 80309, USA

School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE 68583-0978, USA

NOAA/ARL/ATDD, Oak Ridge, TN 37830-2456, USA

Department of Plant Biology, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA

School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE 68583-0978, USA

Lawrence Berkeley National Laboratory, Environmental Energy Technologies Division, Atmospheric Science Department, Berkeley, CA 94720, USA