摘要：The Environmental Research Letters publishing team would like to apologise to the authors of the above paper. Due to an inadvertent omission, the paper was published without the correct acknowledgments. This section should read: 'Funding for this research was provided by the National Science Foundation Office of Polar Programs-IPY (Grant 0732954), the NASA Carbon Cycle & Ecosystems Program (Grant NNX08AG13G), and the NOAA Global Carbon Cycle Program (Grant NA08OAR4310526). We wish to thank Yufang Jin, Jim Randerson, and two anonymous reviewers whose comments helped to improve the manuscript. We also acknowledge the MODIS Land Science Team for continued maintenance and development of the BRDF/Albedo products.'
