1. Department of Geology University of Illinois at Urbana‐Champaign Champaign Illinois USA
2. Department of Plant Biology University of Illinois at Urbana‐Champaign Urbana Illinois USA
3. College of Earth, Ocean, and Atmospheric Sciences Oregon State University Corvallis Oregon USA
4. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder Boulder Colorado USA
5. Department of Atmospheric and Oceanic Sciences University of Colorado Boulder Boulder Colorado USA
6. School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta Georgia USA