Xuhui Wang¹, Shilong Piao¹, Feng Zhou², Chenzhi Wang¹, Hui Yang³ and Philippe Ciais⁴, (1)Peking University, College of Urban and Environmental Sciences, Beijing, China, (2)Peking University, China, Beijing, China, (3)Peking University, Beijing, China, (4)LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette Cedex, France