Ice core precipitation record in central Tibetan plateau since AD 1600

T. Yao (1, 2) , K. Duan (1, 2) , B. Xu (1, 2) , N. Wang (1, 2) , X. Guo (1) , X. Yang (1)

1 Institute of Tibetan Plateau Research
2 State Key Laboratory of Cryospheric Sciences

Lack of reliable long-term precipitation record from northern Tibetan Plateau has constrained the understanding of precipitation variation in this region. An ice core drilled from the Puruogangri Ice Field on central Tibetan Plateau in the year 2000 helped reveal the precipitation variations since AD 1600. Analysis of the annual accumulation data presented precipitation changes from AD 1600, indicative of wet and dry periods in the past 400 year in the central Tibetan Plateau. Accordingly, the 18th and 20th centuries experienced high precipitation period, whilst the 19th century experienced low precipitation period. Such a feature was consistent with precipitation recorded in ice cores from Dunde and Guliya Glaciers, northern Tibetan Plateau. Besides, the results also pointed to consistency in precipitation-temperature correlation on the northern Tibetan Plateau, in a way that temperature and precipitation were positively correlated. But this feature was contrary to the relationship revealed from Dasuopu ice cores, southern Tibetan Plateau, where temperature and precipitation were negatively correlated. The north-south contrast in precipitation amount and its relationship with temperature may shed light on the reconstruction of Asian monsoon since AD 1600.

Domaines: Interfaces continentales, environnement; Sciences de la Terre

T. Yao, K. Duan, B. Xu, N. Wang, X. Guo, et al.. Ice core precipitation record in central Tibetan plateau since AD 1600. Climate of the Past Discussions, 2008, 4 (1), pp.233-248. ⟨hal-00298210⟩