*Jiaguo Qi^1,2、Xiaoping Xin⁴、Dennis Ojima⁵、Pavel Groisman³、Jiquan Chen¹ (1.Center for Global Change & Earth Observations, Michigan State University、2.Zhejiang University、3.University Corp. for Atmospheric Research at the NOAA National Centers for Environmental Information, Asheville, NC, USA、4.Chinese Academy of Agricultural Sciences, Beijing, China、5.Colorado State University, Ft. Collins, CO, USA)