Hydrothermal structure of a polythermal glacier in Spitsbergen by measurements and numerical modeling
Thickness of the upper cold ice layer in the ablation area of the polythermal glacier Grønfjordbreen (Spitsbergen) was estimated by means of numerical modeling. The results were compared with data of radio-echo sounding of the same glacier obtained in 1979 and 2012. Numerical experiments with changi...
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| Format: | Article |
| Language: | Russian |
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Nauka
2016-05-01
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| Series: | Лëд и снег |
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| Online Access: | https://ice-snow.igras.ru/jour/article/view/294 |
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| author | A. V. Sosnovsky Yu. Ya. Macheret A. F. Glazovsky I. I. Lavrentiev |
| author_facet | A. V. Sosnovsky Yu. Ya. Macheret A. F. Glazovsky I. I. Lavrentiev |
| author_sort | A. V. Sosnovsky |
| collection | DOAJ |
| description | Thickness of the upper cold ice layer in the ablation area of the polythermal glacier Grønfjordbreen (Spitsbergen) was estimated by means of numerical modeling. The results were compared with data of radio-echo sounding of the same glacier obtained in 1979 and 2012. Numerical experiments with changing water content in the lower layer of temperate ice and surface snow cover thickness made possible to compare calculated and modeled cold ice thicknesses and to estimate their changes for 33‑year period caused by regional climate change. According to data of radio-echo sounding, thickness of the cold ice layer decreased, on average, by 34 m. Numerical modeling shown similar results: the cold ice layer became thinner by 31 m and 39 m at altitudes 100–300 a.s.l. under the snow cover thickness of 1 m and 2 m. We explain this by rising of annual mean air temperature by 0,6 °С as compared to data of the nearest meteorological station Barentsburg in the same period. We believe that changes in cold ice layer thickness in polythermal glaciers can be used for estimation of changes in such regional climatic parameter as mean air temperature at different altitudes of the glacier surface in the ablation area. |
| format | Article |
| id | doaj-art-32d05f4aaa1c4495b45c382a9a8d3f90 |
| institution | Kabale University |
| issn | 2076-6734 2412-3765 |
| language | Russian |
| publishDate | 2016-05-01 |
| publisher | Nauka |
| record_format | Article |
| series | Лëд и снег |
| spelling | doaj-art-32d05f4aaa1c4495b45c382a9a8d3f902025-08-20T03:37:50ZrusNaukaЛëд и снег2076-67342412-37652016-05-0156214916010.15356/2076-6734-2016-2-149-160262Hydrothermal structure of a polythermal glacier in Spitsbergen by measurements and numerical modelingA. V. Sosnovsky0Yu. Ya. Macheret1A. F. Glazovsky2I. I. Lavrentiev3Institute of Geography, Russian Academy of Sciences, Moscow, RussiaInstitute of Geography, Russian Academy of Sciences, Moscow, RussiaInstitute of Geography, Russian Academy of Sciences, Moscow, RussiaInstitute of Geography, Russian Academy of Sciences, Moscow, RussiaThickness of the upper cold ice layer in the ablation area of the polythermal glacier Grønfjordbreen (Spitsbergen) was estimated by means of numerical modeling. The results were compared with data of radio-echo sounding of the same glacier obtained in 1979 and 2012. Numerical experiments with changing water content in the lower layer of temperate ice and surface snow cover thickness made possible to compare calculated and modeled cold ice thicknesses and to estimate their changes for 33‑year period caused by regional climate change. According to data of radio-echo sounding, thickness of the cold ice layer decreased, on average, by 34 m. Numerical modeling shown similar results: the cold ice layer became thinner by 31 m and 39 m at altitudes 100–300 a.s.l. under the snow cover thickness of 1 m and 2 m. We explain this by rising of annual mean air temperature by 0,6 °С as compared to data of the nearest meteorological station Barentsburg in the same period. We believe that changes in cold ice layer thickness in polythermal glaciers can be used for estimation of changes in such regional climatic parameter as mean air temperature at different altitudes of the glacier surface in the ablation area.https://ice-snow.igras.ru/jour/article/view/294numerical modelingpolythermal glaciersnow coverspitsbergenthickness of cold layer |
| spellingShingle | A. V. Sosnovsky Yu. Ya. Macheret A. F. Glazovsky I. I. Lavrentiev Hydrothermal structure of a polythermal glacier in Spitsbergen by measurements and numerical modeling Лëд и снег numerical modeling polythermal glacier snow cover spitsbergen thickness of cold layer |
| title | Hydrothermal structure of a polythermal glacier in Spitsbergen by measurements and numerical modeling |
| title_full | Hydrothermal structure of a polythermal glacier in Spitsbergen by measurements and numerical modeling |
| title_fullStr | Hydrothermal structure of a polythermal glacier in Spitsbergen by measurements and numerical modeling |
| title_full_unstemmed | Hydrothermal structure of a polythermal glacier in Spitsbergen by measurements and numerical modeling |
| title_short | Hydrothermal structure of a polythermal glacier in Spitsbergen by measurements and numerical modeling |
| title_sort | hydrothermal structure of a polythermal glacier in spitsbergen by measurements and numerical modeling |
| topic | numerical modeling polythermal glacier snow cover spitsbergen thickness of cold layer |
| url | https://ice-snow.igras.ru/jour/article/view/294 |
| work_keys_str_mv | AT avsosnovsky hydrothermalstructureofapolythermalglacierinspitsbergenbymeasurementsandnumericalmodeling AT yuyamacheret hydrothermalstructureofapolythermalglacierinspitsbergenbymeasurementsandnumericalmodeling AT afglazovsky hydrothermalstructureofapolythermalglacierinspitsbergenbymeasurementsandnumericalmodeling AT iilavrentiev hydrothermalstructureofapolythermalglacierinspitsbergenbymeasurementsandnumericalmodeling |