Preprints
https://doi.org/10.5194/tc-2021-380
https://doi.org/10.5194/tc-2021-380
 
27 Jan 2022
27 Jan 2022
Status: a revised version of this preprint is currently under review for the journal TC.

Long-term firn and mass balance modelling for Abramov glacier, Pamir Alay

Marlene Kronenberg1, Ward van Pelt2, Horst Machguth1, Joel Fiddes3, Martin Hoelzle1, and Felix Pertziger4 Marlene Kronenberg et al.
  • 1Department of Geosciences, University of Fribourg, Fribourg, Switzerland
  • 2Department of Earth Sciences, Uppsala University, Uppsala, Sweden
  • 3WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland
  • 4GIS consultant, Auckland, New Zealand

Abstract. Several regional studies identified heterogeneous mass changes in western High Mountain Asia over the last decade. Causes for these mass change patterns are still not fully understood. Modelling the physical interactions between glacier surface and atmosphere over several decades can provide insight into relevant processes. Such model applications, however, have data needs which are usually not met in these data scarce regions. Unique glaciological and meteorological data exist for the Abramov glacier in the Pamir Alay range. In this study, we use weather station measurements in combination with downscaled reanalysis data to force a coupled surface energy balance–multilayer subsurface model for Abramov glacier for 52 years. Available in situ data are used for model calibration and validation. We find an overall negative mass balance of −0.27m w.e. a−1 for 1968/1969–2019/2020 and a loss of firn pore space causing a reduction of internal accumulation. Despite increasing air temperatures, we do not find an acceleration of glacier-wide mass loss over time. Such an acceleration is compensated by increasing precipitation rates (+0.0022 m w.e. a−1, significant at a 90 % confidence level). Our results indicate a significant correlation between annual mass balance and precipitation (R2 = 0.72).

Marlene Kronenberg et al.

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Marlene Kronenberg et al.

Data sets

EBFM initial conditions Kronenberg, Marlene, van Pelt, Ward, Machguth, Horst, Fiddes, Joel, Hoelzle, Martin, & Pertziger, Felix https://zenodo.org/record/5773796#.YbS5xlkxlhE

EBFM Abramov topo grid Kronenberg, Marlene, van Pelt, Ward, Machguth, Horst, Fiddes, Joel, Hoelzle, Martin, & Pertziger, Felix https://zenodo.org/record/5773796#.YbS5xlkxlhE

EBFM Abramov forcing Kronenberg, Marlene, van Pelt, Ward, Machguth, Horst, Fiddes, Joel, Hoelzle, Martin, & Pertziger, Felix https://zenodo.org/record/5773796#.YbS5xlkxlhE

Model code and software

EBFM_abramov Kronenberg, Marlene, van Pelt, Ward, Machguth, Horst, Fiddes, Joel, Hoelzle, Martin, & Pertziger, Felix https://zenodo.org/record/5773796#.YbS5xlkxlhE

Marlene Kronenberg et al.

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Short summary
The Pamir Alay is located at the edge of regions with anomalous glacier mass changes. Unique long-term in situ data are available for Abramov glacier located in the Pamir Alay. In this study, we use this extraordinary data set in combination with reanalysis data and a coupled surface energy balance–multilayer subsurface model to compute and analyse the distributed climatic mass balance from 1968 to 2020.