1. Department of Agronomy; Purdue University; West Lafayette Indiana USA
2. Department of Earth, Atmospheric, and Planetary Sciences; Purdue University; West Lafayette Indiana USA
3. Department of Geography; Michigan State University; East Lansing Michigan USA
4. Department of Atmospheric Sciences; University of Illinois at Urbana-Champaign; Urbana Illinois USA
5. Department of Agronomy; Iowa State University of Science and Technology; Ames Iowa USA
6. Department of Agricultural Economics; Purdue University; West Lafayette Indiana USA