Two Thousand Years of Temperature Change in China
Ge, Q.-S., Zhang, X.-Z., Hao, Z.-X. and Zheng, J.-Y. 2011. Rates of temperature change in China during the past 2000 years. Science China Earth Sciences 54: 1627-1634.
Using 24 preexistent proxy temperature series, the four researchers at the Institute of Geographic Sciences and Natural Resources Research of the Chinese Academy of Sciences analyzed rates of temperature change in China at 30- to 100-year time scales for the past 2000 years and at a 10-year time scale for the past 500 years. In doing so, Ge et al. report that "the warming rates at centennial and decadal scales in the 20th century were not exceptional for the past 2000 years." At the 30-year time scale, for example, they found that the peak rate was "less than rates for previous periods, such as the rapid warming from the Little Ice Age to the 20th century and from the 270s-290s to 300s-320s." Likewise, they say that "the peak rates of the 100-year scale warming in the AD 180s-350s in northeastern China as well as those in the 260s-410s and 500s-660s in Tibet were all greater than those from the mid-19th to 20th century." And they additionally note that although "the rates of the most rapid cooling at scales of 30 to 100 years in the Little Ice Age were prominent," they state that they "were also not unprecedented in the last 2000 years."
"In conclusion," in the words of Ge et al., "it is demonstrated that although human-induced greenhouse effects may have contributed to rapid global warming in the 20th century, in the case of China such rapid decadal to centennial warming has occurred in preindustrial times [bold and italics added]," which significantly weakens the worn-out climate-alarmist claim of late 20th-century warming being unprecedented over the past one to two millennia.
IGBP (International Geosphere-Biosphere Programme). 2009. PAGES Science Plan and Implementation Strategy. Report 57: 3-9.