Evolution of East Asian summer monsoon during the last millennium
Li Qian1,2,3, Wei Fengying2, Li Dongliang1
1 Nanjing University of Information Science and Technology，Nanjing 210044，Jiangsu 2 State Key Laboratory of Severe Weather，Chinese Academy of Meteorological Sciences，Beijing 100081 3 Shaanxi Provincial Climate Center, Xi′an 710014, Shaanxi
Abstract：Based on the well coupling relationship between the six regional dry/wet series and data of the East Asian Sea Level Pressure（SLP）, SLP in summer was reconstructed during 960-2000 A.D. and then the results of the reconstruction were tested.Meanwhile，the East Asian summer monsoon index（EASMI） was defined by using the reconstructed SLP and the evolution of the East Asian summer monsoon(EASM) was discussed during the last millennium.The results show that the reconstructed SLP has certain reliability in the East Asian during themillennium，and it provides foundation for studying the long-term variation of EASM.The periods of 60～70 a，30～40 a and 10～20 a were discovered in EASMI.The nine times abrupt changes were found in EASMI and the most significant vibration occurred in 1230s.
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