Journal of Geographical Sciences ›› 2008, Vol. 18 ›› Issue (2): 155-165.doi: 10.1007/s11442-008-0155-9

• Climate and Environmental Change • Previous Articles     Next Articles

Stable isotopes of summer monsoonal precipitation in southern China and the moisture sources evi-dence from δ18O signature

LIU Jianrong1,2, SONG Xianfang1, YUAN Guofu3, SUN Xiaomi3, LIU Xin1,2, WANG Zhimin1, WANG Shiqin1,2   

  1. 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China|
    2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China|
    3. CERN Sub-center of Water, Beijing 100101, China
  • Received:2007-08-28 Revised:2007-12-06 Online:2008-06-25 Published:2008-06-25
  • Supported by:

    National Natural Science Foundation of China, No. 40671034; Foundation of Isotopes in Precipitation of Chinese Ecosystem Research Network

Abstract:

Summer monsoons (South Asian monsoon, South China Sea monsoon and Sub-tropical monsoon) are prominent features of summertime climate over southern China. Dif-ferent monsoons carry different inflow moisture into China and control the temporal and spa-tial distributions of precipitation. Analyses of meteorological data, particularly wind, tempera-ture and pressure anomalies are traditional methods of characterizing moisture sources and transport patterns. Here, we try to utilize the evidence from stable isotopes signatures to trace summer monsoons over southern China. Based on seven CHNIP (Chinese Network of Iso-topes in Precipitation) observatory stations located in southern China, monthly composite precipitation samples have been collected and analyzed for the composition of δ18O during July, 2005. The results indicated that the spatial distributions of δ18O in precipitation could properly portray the moisture sources together with their transport pathways. Moreover, the amount effect, altitude effect, temperature effect and the correlation between δ18O vs. relative humidity were discussed.

Key words: summer monsoon, precipitation, δ18O, vapor inflow corridors, southern China