Relationship between recent climate change, ablation conditions of glaciers of the East Sayan Range, Southeastern Siberia, and atmospheric circulation patterns

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• 作者：O. P. Osipova ; E. Y. Osipov
• 关键词：South ; East Siberia ; East Sayan range ; Munku ; Sardyk ; Climate change ; Air temperature ; Atmospheric circulation ; NCEP/NCAR reanalysis ; Glacier change ; Ablation
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：74
• 期：3
• 页码：1947-1956
• 全文大小：2,532 KB
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• 作者单位：O. P. Osipova (1)
  E. Y. Osipov (2)
  
  1. V.B. Sochava Institute of Geography of SB RAS, Ulan-Batorskaya st. 1, Irkutsk, 664033, Russia
  2. Limnological Institute of SB RAS, Ulan-Batorskaya st., 3, Irkutsk, 664033, Russia
  
• 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

The 2001-013 sum of positive temperatures (SPT) record, as a proxy of snow/ice ablation, has been obtained for the high-mountain glaciarized Munku-Sardyk massif, East Sayan Mountains, using daily NCEP/NCAR reanalysis data. The SPT (and ice melt) demonstrates a significant decreasing trend, with the highest values in 2001, 2002, and 2007, and the lowest in 2013. We have investigated relationships between potential summer ablation and synoptic-scale conditions over the study area. Increased summer ablation is associated with anticyclonic pressure field, secondary anticyclones with cloudless weather conditions, and low gradient field. Reduced ablation is strongly correlated with Arctic air invasions, cyclonic pressure field, and southern cyclones entailed the advection of cold air masses. Statistically significant correlations have been found between the SPT data and meridional circulation intensity and cyclonic/anticyclonic activity. Variability of regional atmospheric circulation conditions in the early 21st century resulted in change of high-mountain snow/ice melt regime and could lead to future change of the East Sayan glaciers.