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Contemporary processes of environmental information in the atmosphere-glacier-runoff system in an area of typical monsoon temperate glacier 被引量:6

Contemporary processes of environmental information in the atmosphere-glacier-runoff system in an area of typical monsoon temperate glacier
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摘要 Sampling was carried out at Baishui No.1, the largest glacier on Mt. Yulong, China, during the summers of 1999 and 2000, to investigate the spatial variations of oxygen isotopes in the atmosphere-glacier-river system. The results confirm that there is an inverse relation between the oxygen isotopic composition of precipitation and air temperature/precipitation amount. This suggests that a strong 'precipitation amount effect' exists in this typical monsoon temperate-glacier region. There are marked differences of the δ18O values of winter-accumulated snow, glacial meltwater, summer precipitation and the glacier-fed river water. Spatial and temporal variations of isotopic composition are controlled by climatic conditions. Isotopic fractionation and differentiation occur during phase changes, snow-to-ice and ice-to-meltwater transformations, and runoff processes. Variations of stable isotopes in glacier runoff can indicate variations of sources of supply, as well as different discharge-related processes. Ionic changes occur as a result of meltwater contact with glacier bed materials. Sampling was carried out at Baishui No.1, the largest glacier on Mt. Yulong, China, during the summers of 1999 and 2000, to investigate the spatial variations of oxygen isotopes in the atmosphere-glacier-river system. The results confirm that there is an inverse relation between the oxygen isotopic composition of precipitation and air temperature/precipitation amount. This suggests that a strong "precipitation amount effect" exists in this typical monsoon temperate-glacier region. There are marked differences of the δ18O values of winter-accumulated snow, glacial meltwater, summer precipitation and the glacier-fed river water. Spatial and temporal variations of isotopic composition are controlled by climatic conditions. Isotopic fractionation and differentiation occur during phase changes, snow-to-ice and ice-to-meltwater transformations, and runoff processes. Variations of stable isotopes in glacier runoff can indicate variations of sources of supply, as well as different discharge-related processes.
出处 《Science China Earth Sciences》 SCIE EI CAS 2001年第S1期275-283,共9页 中国科学(地球科学英文版)
基金 the National Natural Science Foundation of China (Grant No. 40071023), the Chinese KeyBasic Research Project (Grant No. G1998040800), the Key Project of the Chinese Academy of Sciences (Grant No. KZCX-2-301) and the Knowledge-Innovation Funds (210019 a
关键词 MONSOON temperate-glacier environmental information CONTEMPORARY processes. : monsoon temperate-glacier, environmental information, contemporary processes.
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