A long-term analysis of the historical dry boundary for the Great Plains of North America: Implications of climatic variability and climatic change on temporal and spatial patterns in soil moisture

a Research Soil Geographer, USDA-Agricultural Research Service, Jornada Experimental Range, MSC 3JER, NMSU, Box 30003, Las Cruces, NM 88003-8003, USA b College of Liberal Arts & Sciences, Roosevelt Hall, 1 Kellogg Circle, Emporia State University, Emporia, Kansas 66801, USA c Geosciences Department, University of West Georgia, Callaway Building, 1601 Maple Street, Carrollton, GA 30118, USA d Department of Horticulture & Landscape Architecture, Colorado State University, 1173 Campus Delivery, Fort Collins, CO 80523-1173, USA e Department of Soil & Crop Sciences, Colorado State University, 1170 Campus Delivery, Fort Collins, CO 80523-1173, USA