A New Millenary Warm Period May Be Emerged
TANG Mao－cang, LIU Yan－xiang, FENG Song (Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China)
A quasi－periodic wave length about 2.1-2.8 ka was found with Δ14C recorder since 15 ka BP and with the sunspot cycle length (SCL) over past 2600 years. They are identical in climate wave of cold and warm over the global. A start marker of millenary warm period is special stability (SCL is in 9~12 years) of solar activity last out 300 years based on SCL′s law of last ‘double－millenary wave’. The stability has been sustained 90 years since 1910 what has qualitative difference with short stability of solar activity in ‘millenary cold period’. So, it may be a start marker of ‘millenary warm period’.