Relationship between glacier melting and atmospheric circulation in the southeast Siberia

3rd International Conference Environment and Sustainable Development of Territories: Ecological Challenges of the 21st Century

生态环境科学;地球科学;经济学

Osipova, O.P.^1 ; Osipov, E.Y.^2

V B Sochava Institute of Geography SB RAS, Ulan-Batorskaya st., 1, Irkutsk

664033, Russia^1

Limnological Institute SB RAS, Ulan-Batorskaya st., 3, Irkutsk

664033, Russia^2

关键词: Atmospheric circulation;    Atmospheric circulation patterns;    Atmospheric fronts;    Environmental Monitoring;    Geo-potential heights;    Hydrometeorology;    Mountain glaciers;    Surface mass balance;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/107/1/012039/pdf
DOI  :  10.1088/1755-1315/107/1/012039

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The interaction between climate and cryosphere is a key issue in recent years. Changes in surface mass balance of mountain glaciers closely correspond to differential changes in atmospheric circulation. Mountain glaciers in southeast Siberia located on East Sayan, Baikalsky and Kodar ridges have been continuously shrinking since the end of the Little Ice Age. In this study we used daily synoptic weather maps (Irkutsk Center of Hydrometeorology and Environmental Monitoring), 500 hPa, 700 hPa and 850 hPa geopotential height and air temperature data of NCEP/NCAR reanalysis to assess relationships between atmospheric circulation patterns and the sum of positive temperature (SPT), a predictor of summer ice/snow ablation. Results show that increased SPT (ablation) is generally associated with anticyclones and anticyclonic pressure fields (with cloudless weather conditions) and warm atmospheric fronts. Decreased SPT (ablation) is strongly correlated with cyclones and cyclonic type pressure fields, cold atmospheric fronts and air advections. Significant correlations have been found between ablation and cyclonic/anticyclonic activity. Revealed decreasing trends in the SPT in three glaciarized ridges at the beginning of the 21st century led to changes of air temperature and snow/ice melt climates.