Using enhanced GRACE water storage data to improve drought detection by the U.S. and North American Drought Monitors. - Rasmus Houborg; Matthew Rodell; Jay Lawrimore; Bailing Li; Rolf Reichle; Richard Heim; Matthew Rosencrans; Rich Tinker; James S. Famiglietti; Mark Svoboda; Brian D. Wardlow; Benjamin F. Zaitchik (IGARSS, 2010)