Quan, Cheng , Liu, Yusheng , Utescher, Torsten .
Paleogene evolution of precipitation in northeast China supporting the mid Eocene intensification of the East Asian monsoon.
The early development of the East Asian monsoon in the geological past is highly critical in paleoclimatological study, but few quantitative results are known. Based on fossil plants from Fushun of NE China, we here present a quantitative estimation on the evolution of the precipitation in this area during the mid Paleocene - late Eocene. The results demonstrate that the seasonal precipitation prevailed during the interval, suggesting that the early monsoonal system had already developed in this period. Comparing Paleogene climatic results from different latitudes spanning eastern China, we conclude that the East Asian monsoon must have had been significantly enhanced after the late mid Eocene (~41-40 Ma), due to the evidently increased precipitation differentiation between wet and dry months as shown in the present study. Both the uplift of the Da Hinggan Mountains in NE Asia on the regional topographical background and the India-Asia collision in the global context might have conjointly contributed to the early monsoon intensification by the influence on the air mass movement and associated precipitation pattern in the monsoonal realm.
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1 - East Tennessee State University, Department Of Biology, PO Box 70703, Johnson City, TN, 37614-1710, USA
2 - Bonn University, 4Steinmann Institute, Bonn, 53115, Germany
East Asian monsoon
mid Eocene intensification
Presentation Type: Poster:Posters for Sections
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM