RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (11): 1860-1869.doi: 10.11870/cjlyzyyhj201511008

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A STUDY ON PRECIPITATION STABLE ISOTOPES CHARACTERISTICS AND VAPOR SOURCES OF THE SUBALPINE GONGGA MOUNTAIN, CHINA

SONG Chun-lin1,2, SUN Xiang-yang1, WANG Gen-xu1   

  1. 1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-01-13 Revised:2015-02-12 Online:2015-11-20

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Abstract: The stable isotopic composition of precipitation are integrated tracers of atmospheric processes worldwide. It is widely used to determine vapor sources with precipitation stable hydrogen and oxygen isotopes. More than 20 stations in the Tibetan Plateau has been studied the precipitation isotopic composition since the 1990s. But the precipitation isotope characteristics and water vapor moving patterns in Tibetan Plateau southeast edge of Gongga Mountain remains unclear. Based on the precipitation samples and detailed meteorological data in subalpine area of Gongga Mountain from May 2012 to October 2012, we analyzed the temporal and spatial variation of δD and δ18O. Meanwhile, the water vapor sources of Gongga Mountain was tracked by HYSPLIT model with backwards trajectory method and the modeled trajectories was synthesized with δD and δ18O values. The results shows that the LMWL(Local Meteoric Water Line) of this region is δD = 9.4019 × δ18O + 28.5303(‰)( R2= 0.9833,p < 0.001). This LWML's slope and interception is higher than the GMWL (Global Meteoric Water Line), which is caused by the rainy and relatively low temperature meteorological characteristics of the subalpine area of Gongga Mountain. Both δD and δ18O decreases when the mountain elevation rises, which is because both temperature and precipitation amount changes along the elevation. This "altitude effect" differs in different months. The δD and δ18O of this region are both high when rainy season begins and ends. The highest radiation at august leads to a small peak on hydrogen and oxygen isotope curves. Statistical analysis indicates that the relationships between stable precipitation isotopes and meteorological factors are closely related. When the temperature and precipitation amount rises, both hydrogen and oxygen isotopes decreases. Besides, hydrogen and oxygen isotopes are negatively and positively correlated with water vapor pressure and wind velocity, respectively. Monthly deuterium excess data shows no "altitude effect" and no differences with global average deuterium excess value 10‰. Backwards trajectory analysis associated with the isotope data reveal that the vapor sources of this area are mainly from westerly transport, eastern monsoon and local evaporation. This pattern is similar to Tibetan Plateau and Himalayas. The results can provide a scientific basis for the study of hydrological and atmospheric processes in alpine ecosystem.

Key words: Gongga Mountain, precipitation, stable hydrogen and oxygen isotopes, eoric water line, water vapor sources

CLC Number: 

  • P332.1
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