7IPCC.Summary for Policymakers of Climate 2007:The Physical Science Basis.Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change.Cambridge University Press,2007.
9IPCC.Climate Change 2007:Synthesis Report[C] //CORE WRITING TEAM,PACHAURI,R.K & REISINGER,A.The assessment of the three Working Groups of the IPCC's Fourth Assessment Report.Geneva,Switzerland,2007:104.
10EASTERLING D R.Recent changes in frost days and the frost-free season in the United States[J].Bulletin of the American Meteorological Society,2002,83(9):1327-1332.
