Measuring and inferring the ice thickness distribution of four glaciers in the Tien Shan, Kyrgyzstan

Lander Van Tricht, Philippe Huybrechts, Jonas Van Breedam, Johannes J. Fürst, Oleg Rybak, Rysbek Satylkanov, Bakyt Ermenbaiev, Viktor Popovnin, Robbe Neyns, Chloë Paice, Philipp Malz

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5 Citaten (Scopus)
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Samenvatting

Glaciers in the Tien Shan mountains contribute considerably to the fresh water used for irrigation, households and energy supply in the dry lowland areas of Kyrgyzstan and its neighbouring countries. To date, reconstructions of the current ice volume and ice thickness distribution remain scarce, and accurate data are largely lacking at the local scale. Here, we present a detailed ice thickness distribution of Ashu-Tor, Bordu, Golubin and Kara-Batkak glaciers derived from radio-echo sounding measurements and modelling. All the ice thickness measurements are used to calibrate three individual models to estimate the ice thickness in inaccessible areas. A cross-validation between modelled and measured ice thickness for a subset of the data is performed to attribute a weight to every model and to assemble a final composite ice thickness distribution for every glacier. Results reveal the thickest ice on Ashu-Tor glacier with values up to 201 ± 12 m. The ice thickness measurements and distributions are also compared with estimates composed without the use of in situ data. These estimates approach the total ice volume well, but local ice thicknesses vary substantially.
Originele taal-2English
Pagina's (van-tot)269-286
Aantal pagina's18
TijdschriftJournal of Glaciology
Volume67
Nummer van het tijdschrift262
DOI's
StatusPublished - 1 apr 2021

Bibliografische nota

Funding Information:
We thank Erlan Azisov from the Central Asian Institute of Applied Geosciences (CAIAG) and Martina Barandun from Université de Fribourg for providing the SMB data of Golubin glacier. O.R. was supported by the RFBR grant No. 20-05-00681. Results produced by J.J.F. are based on numerical simulations conducted at the high-performance computing centre of the Regionales Rechenzentrum Erlangen (RRZE) of the University of Erlangen-Nürnberg. Lander Van Tricht holds a PhD fellowship of the Research Foundation-Flanders (FWO-Vlaanderen).

Publisher Copyright:
Copyright © The Author(s), 2020. Published by Cambridge University Press.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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