[求助] 轴心时代（英语：Axial Age，或Axial Era）的天气情况

      轴心时代（英语：Axial Age，或Axial Era），由德国哲学家卡尔·雅斯贝尔斯提出的哲学发展理论。意指公元前八百年至公元前两百年之间，在这段时期中，世上主要宗教背后的哲学都同时发展起来。

     Axial  Age or  Axial  Period (German: Achsenzeit, "axis time") is a term coined by German philosopher Karl Jaspers to describe the period from 800 to 200 BC, during which, according to him, similar new ways of thinking appeared in Persia, India, the Sinosphere and the Western world. The concept was introduced in his book Vom Ursprung und Ziel der Geschichte (The Origin and Goal of History^[1]), published in 1949.

http://en.wikipedia.org/wiki/Axial_Age

NOAA Climate Reconstruction

http://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/climate-reconstruction 

里有Northern Hemisphere Temperature (Ice Cores), 4,000 Years, Kobashi et al. 2013

《Causes of Greenland temperature variability over the past 4000 yr: implications for northern hemispheric temperature changes. CLIMATE OF THE PAST, 2013, 9(5): 2299-2317》，http://www.clim-past.net/9/2299/2013/cp-9-2299-2013.html

还有别的吗？

貌似：相对平稳的气温，大有好处。

      轴心（-600~-300）、西汉（-202~8）、唐（618~907）、明清（1368~1912），都存在气温长期相对稳定时期？  

感谢您的指教！