Equilibrium configurations of Djankuat glacier in various climatic conditions

 О.О. Rybak1,2, Е.А. Rybak1,2, I.A. Korneva2,3, P.A. Morozova4, V.V. Popovnin5

 1Sochi Research Center of RAS, Sochi

2Branch of Institute of Natural and Technical Systems, Sochi

E-mail: o.o.rybak@gmail.com, elena.rybak@gmail.com

3Institute of Global Climate and Ecology of Roshydromet and RAS, Moscow

E-mail: comissa@mail.ru

4Institute of Geography of RAS, Moscow

E-mail: morozova_polina@mail.ru

5Lomonosov Moscow State University, Moscow

E-mail: begemotina@hotmail.com

DOI: 10.33075/2220-5861-2018-4-102-109

UDC 551.89, 551.583.7     

Abstract:

    Ubiquitous degradation of mountain glaciation all over the world (with occasional exceptions), including the Greater Caucasus, highlights the task of forecasting of states of glaciers under conditions of climate change. Implementation of relatively simple schematic climatic scenarios instead of using simulated continuous changes produced by global climate modeling is the alternative way of carrying out prognostic studies. The essence of this approach is investigation of consequences of an abrupt change of one or another component of climatic forcing. This paper continues the series of studies focused on various aspects of dynamics of Djankuat Glacier in the Central Caucasus. Here, we present results of the research of equilibrium states of Djunkuat Glacier after abrupt change of two climatic key variables – surface air temperature and precipitation.

    Mathematical model applied in the study, its architecture, the system of equations and numerical methods, as well as input of climatic, topographic and other data used in the numerical experiments, were considered in detail in earlier papers referenced in the text. As a result of eleven numerical experiments made during 150 modeling years we confirmed high sensitivity of the glacier to temperature rise. Sensitivity to a decrease of total precipitation was not as high as sensitivity to temperature rise. Nevertheless, predicted temperature rise in the region by more than 3ºС combined with considerable drop in precipitation (particularly in the period of snow accumulation) can hypothetically result in catastrophic degradation of the glacier. Since morphometric features of Djankuat are typical for the region, we can obviously expect similar changes for the whole glaciation in the Central Caucasus. Changes in hydrologic regime and decline of the contribution of glacial run off to its total volume will be the consequence of this degradation.

Keywords: climate, mountain glacier, mathematical model, numerical experiment, mass balance, debris, glacial run-off.

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LIST OF REFERENCES

  1. Rybak O.O., Rybak E.A. Model-based calculations of surface mass balance of mountain glaciers for the purpose of water consumption planning: focus on Djankuat Glacier (Central Caucasus) // IOP Conference Series: Earth and Environmental Science. 2018. V. 107. doi :10.1088/1755-1315/107/1/012041.
  2. Rybak O. O., Rybak E. A. Application of data from network meteorological stations for calculating the mass balance of glaciers (on the example of the Dzhankuat glacier, Central Caucasus) / / environmental monitoring Systems. Sevastopol: And PTS. Issue 9 (29). Pp. 100-108.
  3. Rybak O. O., Fisher E. A., Korneva I. A. Model calculations podsolennogo melting on the glacier Djankuat // Monitoring systems of environment. Sevastopol: INTS. 2018. Issue 12 (32). P. 86–92.
  4. Kunachowicz.G., Makarov V. A., Popovnin, V. V. Response of glacier Djankuat on climate change (on the model of Allemans) // Bulletin of the Moscow University. Series 5: Geography. 1996. No. P. 31-37.
  5. Rec E. P., Frolova N. L., Popovnin V. V. Modeling of melting of a mountain glacier surface // Ice and Snow. 2011. No. P. 116-24.
  6. Zemp M., Frey H., Gartmer-Roer I. et al. Historically unprecedented global glacier decline in the early 21st century // Journal of Glaciology. 2015. V. 61. P. 745–762.
  7. Lurie P. M., Panov V. D. Changes in the modern glaciation of the Northern slope of the Greater Caucasus in the XX century and the forecast of its degradation in the XXI century. 2014. No. 4. P. 68-76.
  8. Mathematical modeling of the Earth system / ed. by N. G. Yakovlev, Moscow: MAKS Press, 2016, P. 328.
  9. Morozova P. A., Rybak O. O. Regionalization of global climate modeling data for calculating the mass balance of mountain glaciers // Ice and Snow. 2017. Vol. 57. No. 4. P. 437–452. doi:10.15356/2076-6734-2017-4-437-452.
  10. Jouvet G., Huss M., Blatter H. et al. Numerical simulation of Rhonegletscher from 1874 to 2100 // Journal of Computational Physics. 2009. V. 228. P. 6426– doi: 10.1016/j.jcp.2009.05.033
  11. Jouvet G., Huss M., Funk M., Blatter H. Modelling the retreat of Grosser Aletschgletscher, Switzerland, in a changing climate // Journal of Glaciology. 2011. V. 57. P. 1033– doi: 10.3189/002214311798843359
  12. Zekollari H., Fürst J.J., Huybrechts P. Modelling the evolution of Vadret da Morteratsch, Switzerland, since the Little Ice Age and into the future // Journal of Glaciology. 2014. V. 60. P. 1155– doi: 10.3189/2014JoG14J053.
  13. Zekollari H., Huybrechts P. On the climate–geometry imbalance, response time and volume–area scaling of an alpine glacier: insights from a 3-D flow model applied to Vadret da Morteratsch, Switzerland // Annals of Glaciology. 2015. V. 56. P. 51– doi: 10.3189/2015AoG70A921
  14. Rybak O. O., Rybak E. A., Kutuzov S. S., etc. Calibration of a mathematical model of the dynamics of the Marukh glacier, Western Caucasus // The ice and Snow. 2015. Vol. 55. No. 2. P. 9-20.
  15. Fürst J.J., Rybak O., Goelzer H. et al. Improved convergence and stability properties in a three-dimensional higher-order ice sheet model // Geoscientific Model Development. 2011. V. 4. P. 1133–1149.
  16. Pattyn F. A new three-dimensional higher-order thermomechanical ice sheet model: Basic sensitivity, ice stream development, and ice flow across subglacial lakes // Journal of Geophysical Research. 2003. V. 108. doi:10.1029/2002JB002329.
  17. Nemec J., Huybrechts P., Rybak O., Oerlemans J. Reconstruction of the surface mass balance of Morteratschgletscher since 1865 // Annals of Glaciology. 2009. V. 50. P. 126–134.
  18. Reid T.D., Brock B.W. An energy-balance model for debris-covered glaciers including heat conduction through the debris layer // Journal of Glaciology. 2010. V. 56 (199). P. 903–916.
  19. Bozhinsky A. N., KRASS M. S., Popovnin V. V. The role of the moraine cover in the Thermophysics of mountain glaciers // Materials of glaciological research. 1985. Issue 52, P. 31-46.
  20. Popovnin V. V., Rezepkin A. A., Tielidze L. G. The Growth of the surface moraine in the language of the Dzhankuat glacier during the period of direct glaciological monitoring. 2015. Vol. 19. No. 1. P. 89-98.
  21. Golubev G. N., Dyurgerov M. B., Markin V. A., etc. Djankuat Glacier (Central Caucasus). Water-ice and thermal balance of mountain-glacial basins, L.: Hydrometeoizdat, 1978, P. 183.
  22. Popovnin V. V., Pylayeva, T. V. Avalanche power glacier djankuat // The ice and Snow. 2015. Vol. 55, No. P. 21-32.
  23. Lavrentiev I. I., Kutuzov S. S., Petrakov D. A., etc. Thickness, volume of ice and subglacial relief of the dzhankuat glacier (Central Caucasus) / / Ice and Snow, 2014, Vol. 54, No. 4, P. 7-19. doi: http://dx.doi.org/10.15356/2076-6734-2014-4-7-19.
  24. Pastukhov V. G. Full mass transfer of the glacier djankuat. Diploma work. Moscow: Lomonosov Moscow state University, faculty of geography, Department of cryolithology and glaciology, 2011. P. 150.
  25. Aleynikov A. A., Zolotarev E. A., Popovnin V. V. Recognition of the ice divide on peremetny glacial complexes (Dzhantugan plateau in the Caucasus) / / Bulletin of the Moscow University. Series 5: Geography. No. 3. P. 36-43.
  26. Popovnin V. V. Migration of the ice divide on the Dzhantugan firn plateau // Materials of glaciological research. 1995. No. 79. P. 123-127.

 

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