Elizabeth Herndon, Department of Geosciences, 315 Hosler Bldg, Pennsylvania State University, University Park, PA 16802, United States
Lixin Jin, Department of Geosciences, 302 Hosler Bldg, Pennsylvania State University, University Park, PA 16802, United States
Susan Brantley, Earth and Environmental Systems Institute, 2217 Earth and Engineering Building, Pennsylvania State University, University Park, PA 16802, United States