JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (7): 1211-1221.doi: 10.11849/zrzyxb.20150656

• Resource Evaluation • Previous Articles     Next Articles

The Variations of Hydrogen and Oxygen Compositions and Moisture Sources in the Precipitation in Western Mountain Areas of Beijing

HAO Yue, YU Xin-xiao, DENG Wen-ping, JIA Guo-dong, LOU Yuan-hai, BAI Yan-jing   

  1. College of Soil and Water Conservation and Desertification Combating, Ministry of Education, Beijing Forestry University, Beijing 100083, China
  • Received:2015-06-11 Revised:2016-03-04 Online:2016-07-20 Published:2016-07-20
  • Supported by:
    National Natural Science Foundation of China, No.41430747

Abstract: Stable isotopes of δD and δ18O in precipitation are investigated in western mountains of Beijing from July 2011 to July 2012. The results show that the mean values of δD and δ18O in precipitation in the study area were lower than those in global and in China, and had great difference to those in Beijing, and the isotope values of precipitation within the same month showed great variations. Because of the mutual influence of monsoon climate and atmospheric water vapor cycle, the stable isotopes of δD and δ18O in summer precipitation were less. The isotopic values decreased with the increase of monthly precipitation and temperature from April to July since the rainfall played the leading role in the interaction process of temperature and rainfall. The isotopic values increased from July to September when the temperature took the leading role. There are more stable isotopes of δD and δ18O in winter precipitation since the precipitation was formed in the continental air masses from the northerly winds. The second evaporation after the rainfall in the process of atmospheric water vapor cycle also causes the piecewise fluctuated decline of δD and δ18O in a typical long duration of rain. The meteoric water line equation of the study areas was δD=7.17δ18O+1.46 (R2=0.934 2), and the slope and intercept were lower than those in the national and global atmospheric precipitation line equations. When compared to the meteoric water line equation of Beijing, the slope of the equation was similar and the intercept was obviously different, which indicated that the ocean water vapor was not the only source of water vapor in the study area, the values of isotopes in the precipitation in this area were also influenced by the continental air masses, local strong water vapor cycle and the drying process in recent years. The irregularity of deuterium excess indirectly reflected the complexity of water source in the study area.

Key words: deuterium excess, hydrogen and oxygen isotope, meteoric water line, precipitation, western mountains of Beijing

CLC Number: 

  • P426.6