Impact of prolonged drought on rainfall use efficiency using MODIS data across China in the early 21st century

a The State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and Institute of Remote Sensing Applications of Chinese Academy of Sciences, Beijing, China b School of Geography, Beijing Normal University, Beijing, China c USDA ARS Southwest Watershed Research, Tucson, AZ 85719, USA d College of Global Change and Earth System Sciences, Beijing Normal University, Beijing, China e State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing, China f Soil, Water & Environmental Sciences, University of Arizona, Tucson, AZ 85721, USA