Acta Geographica Sinica ›› 2009, Vol. 64 ›› Issue (9): 1103-1112.doi: 10.11821/xb200909008

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Atmospheric Circulation Information Recorded in Tree-ring δ18O at Lijiang, Yunnan Province

AN Wen-ling,LIU Xiao-hong,CHEN Tuo,XU Guo-bao,HOU Shu-gui, SUN Wei-zhen   

  1. State Key Laboratory of Cryospheric Science,Cold and Arid Regions Environmental and Engineering Research Institute,CAS,Lanzhou 730000,China
  • Received:2009-06-02 Revised:2009-07-09 Online:2009-09-25 Published:2009-09-25
  • Supported by:

    Knowledge Innovation Project of Chinese Acadamy of Sciences, No.KZCX2-YW-317;National Basic Research Program of China (973 Program), No.2007CB411506;National Natural Science Foundation of China, No.40871002

Abstract:

In this paper, tree-ring latewood stable oxygen isotope composition (δ18O) of Lijiang fir (Abies forrestii) was used to estimate the climatic response of tree-ring δ18O by comparing the δ18O values with meteorological records from Lijiang meteorological station. The annually resolved tree-ring δ18O chronology spans the period of 1902-2004. Results indicate that tree-ring δ18O values of latewood were significantly correlated with climate conditions during the growth season. Tree-ring δ18O was mainly correlated with precipitation and relative humidity of the wet season in summer (August to October). Temperature had a weak influence on the tree-ring δ18O, indicating a relatively high correlation with δ18O in May and June (r = 0.35), prior to the rainy season. The strongest correlation was found between the total cloud cover and tree-ring δ18O covering the whole wet season (June to October). Furthermore, tree-ring δ18O shows negative and significant correlations with South Asia monsoon index and East Asia monsoon index in different periods. Meanwhile, a strong correlation between tree-ring δ18O and SOI during the period of 1902-2004, to some degree, indicates that the tree-ring δ18O recorded a large amount of atmospheric circulation information.

Key words: tree-ring, δ18O, precipitation, total cloud cover, relative humidity, South Asia monsoon, East Asia summer monsoo