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Science in China Series D: Earth Sciences

, Volume 44, Issue 9, pp 769–778 | Cite as

Variation of precipitation δ18O in Langtang Valley Himalayas

  • Xinping Zhang
  • Nakawo Masayoshi
  • Koji Fujita
  • Tandong Yao
  • Jiankang Han
Article

Abstract

The variation of the δ18O in precipitation and the relationship with precipitation amount at Kyangjin Base House and Yala Glacier Camp in Langtang Valley, Nepal Himalayas were analyzed. The variations of the δ18O with precipitation had great scatter, and the correlations between the δ18O and precipitation changed with time on the synoptic scale. On the seasonal scale, there was marked amount effect at Kyangjin Base House. However, the δ18O-precipitation gradient was smaller than that on the synoptic scale. Because of the maintenance of the basic equilibrium between stable isotopic compositions in atmospheric vapor and precipitation, the evaporation enrichment was light during the rainy season. Therefore, the variation of stable isotopic compositions in precipitation was independent on the sampling intervals. Simulations show that the rainfall in Langtang Valley was not the outcome of the initial condensation of ocean vapor that originated from low latitudes. The stable isotopic compositions in precipitation were greatly depleted due to the strong rainout of the vapor from oceans as the vapor was raised over the Himalayas.

Keywords

Himalayas Lantang Valley stable isotopic ratio precipitation 

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Copyright information

© Science in China Press 2001

Authors and Affiliations

  • Xinping Zhang
    • 1
    • 2
  • Nakawo Masayoshi
    • 3
  • Koji Fujita
    • 3
  • Tandong Yao
    • 4
  • Jiankang Han
    • 2
  1. 1.Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjingChina
  2. 2.Institute of Territory and Environment ResearchHunan Normal UniversityChangshaChina
  3. 3.Institute for Hydrospheric-Atmospheric SciencesNagoya UniversityNagoyaJapan
  4. 4.Cold and Arid Regions Environmental and Engineering Research InstituteLanzhouChina

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