Global carbon use efficiency

Carbon use efficiency (CUE)—defined as the ratio of Net Primary Productivity (NPP) to Gross Primary Productivity (GPP).Carbon Use Efficiency (CUE) was calculated as the ratio of NPP to GPP (CUE = NPP/GPP) using annual MODIS GPP and NPP data.

碳利用效率（Carbon use efficiency，CUE）被定义为净初级生产力（Net Primary Productivity，NPP）与总初级生产力（Gross Primary Productivity，GPP）的比值。碳利用效率（CUE）是利用年度MODIS GPP和NPP数据，通过NPP与GPP的比值计算得出的（CUE = NPP/GPP）。