8IPCC. Climate Change 2007: Climate change Impacts, adaptation and vulnerability. Working group Ⅱ contribution to the Intergovernmental Panel on Climate Change fourth assessment report [M]. Cambridge, United Kingdom and New York, USA : Cambridge University Press, 2007. 1 - 23.
9Michaels P J. Analysis of trends in the variability of daily and monthly historical temperature measurements [J]. Climate Research, 1998, 42 (1): 10-27.
10Karl T R, Easterling D R, Quayle R G. Indices of climate change for the United states [ J ]. Bulletin of the American Meteorological Society, 1996, (77) : 279 -292.
