Long-term firn and mass balance modelling for Abramov Glacier in the data-scarce Pamir Alay
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Published:2022-12-20
Issue:12
Volume:16
Page:5001-5022
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Kronenberg MarleneORCID, van Pelt WardORCID, Machguth HorstORCID, Fiddes Joel, Hoelzle MartinORCID, Pertziger Felix
Abstract
Abstract. Several studies identified heterogeneous glacier mass changes in western High Mountain Asia over the last decades. 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. Exceptionally detailed 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 −0.27 mw.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 for by increasing
precipitation rates (+0.0022 mw.e.a-1, significant at a 90 % confidence level). Our results indicate a significant correlation
between annual mass balance and precipitation (R2 = 0.72).
Funder
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung Direktion für Entwicklung und Zusammenarbeit
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
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