1. Department of Astronomy and Planetary Science, Northern Arizona University, Flagstaff, AZ, USA
2. Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
3. Institute of Arctic and Alpine Research (INSTAAR), University of Colorado Boulder, CO, USA
4. Battelle, National Ecological Observatory Network (NEON), Boulder, CO, USA
5. Department of Civil, Environmental and Architectural Engineering, University of Colorado Boulder, USA