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Assessing controls on mass budget and surface velocity variations of glaciers in Western Himalaya

This study analyses spatially resolved estimates of mass budget and surface velocity of glaciers in the Zanskar Basin of Western Himalaya in the context of varying debris cover, glacier hypsometry and orientation. The regional glacier mass budget for the period of 1999–2014 is −0.38 ± 0.09 m w.e./a....

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Autores principales: Bhushan, Shashank, Syed, Tajdarul H., Arendt, Anthony A., Kulkarni, Anil V., Sinha, Debanjan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5996025/
https://www.ncbi.nlm.nih.gov/pubmed/29891940
http://dx.doi.org/10.1038/s41598-018-27014-y
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author Bhushan, Shashank
Syed, Tajdarul H.
Arendt, Anthony A.
Kulkarni, Anil V.
Sinha, Debanjan
author_facet Bhushan, Shashank
Syed, Tajdarul H.
Arendt, Anthony A.
Kulkarni, Anil V.
Sinha, Debanjan
author_sort Bhushan, Shashank
collection PubMed
description This study analyses spatially resolved estimates of mass budget and surface velocity of glaciers in the Zanskar Basin of Western Himalaya in the context of varying debris cover, glacier hypsometry and orientation. The regional glacier mass budget for the period of 1999–2014 is −0.38 ± 0.09 m w.e./a. Individual mass budgets of 10 major glaciers in the study area varied between −0.13 ± 0.07 and −0.66 ± 0.09 m w.e./a. Elevation changes on debris-covered ice are considerably less negative than over clean ice. At the same time, glaciers having >20% of their area covered by debris have more negative glacier-wide mass budgets than those with <20% debris cover. This paradox is likely explained by the comparatively larger ablation area of extensively debris-covered glaciers compared to clean-ice glaciers, as indicated by hypsometric analysis. Additionally, surface velocities computed for the 2013–14 period reveal near stagnant debris-covered snouts but dynamically active main trunks, with maximum recorded velocity of individual glaciers ranging between ~50 ± 5.58 and ~90 ± 5.58 m/a. The stagnant debris-covered extent, which varies from glacier-to-glacier, are also characterized by ice cliffs and melt ponds that appreciably increase the overall surface melting of debris-covered areas.
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spelling pubmed-59960252018-06-21 Assessing controls on mass budget and surface velocity variations of glaciers in Western Himalaya Bhushan, Shashank Syed, Tajdarul H. Arendt, Anthony A. Kulkarni, Anil V. Sinha, Debanjan Sci Rep Article This study analyses spatially resolved estimates of mass budget and surface velocity of glaciers in the Zanskar Basin of Western Himalaya in the context of varying debris cover, glacier hypsometry and orientation. The regional glacier mass budget for the period of 1999–2014 is −0.38 ± 0.09 m w.e./a. Individual mass budgets of 10 major glaciers in the study area varied between −0.13 ± 0.07 and −0.66 ± 0.09 m w.e./a. Elevation changes on debris-covered ice are considerably less negative than over clean ice. At the same time, glaciers having >20% of their area covered by debris have more negative glacier-wide mass budgets than those with <20% debris cover. This paradox is likely explained by the comparatively larger ablation area of extensively debris-covered glaciers compared to clean-ice glaciers, as indicated by hypsometric analysis. Additionally, surface velocities computed for the 2013–14 period reveal near stagnant debris-covered snouts but dynamically active main trunks, with maximum recorded velocity of individual glaciers ranging between ~50 ± 5.58 and ~90 ± 5.58 m/a. The stagnant debris-covered extent, which varies from glacier-to-glacier, are also characterized by ice cliffs and melt ponds that appreciably increase the overall surface melting of debris-covered areas. Nature Publishing Group UK 2018-06-11 /pmc/articles/PMC5996025/ /pubmed/29891940 http://dx.doi.org/10.1038/s41598-018-27014-y Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Bhushan, Shashank
Syed, Tajdarul H.
Arendt, Anthony A.
Kulkarni, Anil V.
Sinha, Debanjan
Assessing controls on mass budget and surface velocity variations of glaciers in Western Himalaya
title Assessing controls on mass budget and surface velocity variations of glaciers in Western Himalaya
title_full Assessing controls on mass budget and surface velocity variations of glaciers in Western Himalaya
title_fullStr Assessing controls on mass budget and surface velocity variations of glaciers in Western Himalaya
title_full_unstemmed Assessing controls on mass budget and surface velocity variations of glaciers in Western Himalaya
title_short Assessing controls on mass budget and surface velocity variations of glaciers in Western Himalaya
title_sort assessing controls on mass budget and surface velocity variations of glaciers in western himalaya
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5996025/
https://www.ncbi.nlm.nih.gov/pubmed/29891940
http://dx.doi.org/10.1038/s41598-018-27014-y
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