Isotopic characteristics of cryospheric waters in parts of Western Himalayas, India

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• 作者：S. P. Rai ; Renoj J. Thayyen ; P. Purushothaman ; Bhishm Kumar
• 关键词：Stable isotopes ; Glacier ; Melt water ; Sublimation ; Cold ; arid and alpine regimes ; Ladakh and Kashmir region
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：75
• 期：7
• 全文大小：1,125 KB
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• 作者单位：S. P. Rai (1)
  Renoj J. Thayyen (1)
  P. Purushothaman (1) (2)
  Bhishm Kumar (3)
  
  1. National Institute of Hydrology, Roorkee, 247667, India
  2. Department of Civil Engineering, Saveetha School of Engineering, Saveetha University, Chennai, 602105, Tamil Nadu, India
  3. Isotope Hydrology Section, Division of Physical and Chemical Sciences, International Atomic Energy Agency, Vienna, Austria
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

Present study has analysed stable isotopic composition (δ18O and δ2H) of cryospheric waters of Ladakh and Kashmir regions, located in Western Himalayas, India. The samples of glacier ice (11) and melt water stream (10) collected altitude ranging between 3168 and 5465 m a.s.l. have been analysed for δ18O and δ2H. The measured δ18O values of glacier ice varied between −16.5 and −13.8 ‰ in Ladakh, and between −12.8 and −9.6 ‰ in Kashmir region. Study shows that isotopic characteristics of ice samples collected from snout of glaciers in Ladakh and Kashmir region are distinctly different from each other. Melt water samples collected from streams near the snout during September have shown good resemblance with the glacier ice melt of respective region. The d-excess of glaciers and melt water of Kashmir region varied from 21.0 to 25.6 ‰ and from 18.0 to 21.5 ‰ respectively. The d-excess of glaciers of Ladakh region have been found between 13.5 and 16.7 ‰ and of the melt water between 11.6 and 12.6 ‰. Depleted δ18O signature and low d-excess value of glaciers of Ladakh in comparison with that of Kashmir region may be attributed to sublimation process triggered by cold arid climatic conditions. The present study of Kashmir and Ladakh region suggest that isotopic composition of glacier ice is influenced by post depositional alteration, such as sublimation, during snow to glacier ice transformation.