Long‐term shifts in feedbacks among glacier surface change, melt generation and runoff, McMurdo Dry Valleys, Antarctica
Abstract Glaciers of the McMurdo dry valleys (MDVs) Antarctica are the main source of streamflow in this polar desert. Because summer air temperatures hover near 0°C small changes in the energy balance strongly affect meltwater generation. Here we demonstrate that increased surface roughness, which...
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crwiley:10.1002/hyp.14292 2024-06-02T07:57:03+00:00 Long‐term shifts in feedbacks among glacier surface change, melt generation and runoff, McMurdo Dry Valleys, Antarctica Bergstrom, Anna Gooseff, Michael Fountain, Andrew Hoffman, Matthew National Science Foundation 2021 http://dx.doi.org/10.1002/hyp.14292 https://onlinelibrary.wiley.com/doi/pdf/10.1002/hyp.14292 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/hyp.14292 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002/hyp.14292 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Hydrological Processes volume 35, issue 8 ISSN 0885-6087 1099-1085 journal-article 2021 crwiley https://doi.org/10.1002/hyp.14292 2024-05-03T11:54:02Z Abstract Glaciers of the McMurdo dry valleys (MDVs) Antarctica are the main source of streamflow in this polar desert. Because summer air temperatures hover near 0°C small changes in the energy balance strongly affect meltwater generation. Here we demonstrate that increased surface roughness, which alters the turbulent transfer of energy between the ice surface and atmosphere, yields a detectable increase in meltwater runoff. At low elevations on the glaciers, basin‐like topography became significantly rougher over 13 years between repeat lidar surveys, yielding greater melt. In contrast, the smoother ice at higher elevation exhibited no detectable change in roughness. We pose a conceptual model of the cycle of glacier surface change as a result of climate forcing whereby glacier surfaces transition from being dominated by sublimation to becoming increasingly melt‐dominated, which is reversible under prolonged cool periods. This research advances our understanding of warm season effects on polar glaciers. Article in Journal/Newspaper Antarc* Antarctica McMurdo Dry Valleys polar desert Wiley Online Library McMurdo Dry Valleys Hydrological Processes 35 8 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Glaciers of the McMurdo dry valleys (MDVs) Antarctica are the main source of streamflow in this polar desert. Because summer air temperatures hover near 0°C small changes in the energy balance strongly affect meltwater generation. Here we demonstrate that increased surface roughness, which alters the turbulent transfer of energy between the ice surface and atmosphere, yields a detectable increase in meltwater runoff. At low elevations on the glaciers, basin‐like topography became significantly rougher over 13 years between repeat lidar surveys, yielding greater melt. In contrast, the smoother ice at higher elevation exhibited no detectable change in roughness. We pose a conceptual model of the cycle of glacier surface change as a result of climate forcing whereby glacier surfaces transition from being dominated by sublimation to becoming increasingly melt‐dominated, which is reversible under prolonged cool periods. This research advances our understanding of warm season effects on polar glaciers. |
author2 |
National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Bergstrom, Anna Gooseff, Michael Fountain, Andrew Hoffman, Matthew |
spellingShingle |
Bergstrom, Anna Gooseff, Michael Fountain, Andrew Hoffman, Matthew Long‐term shifts in feedbacks among glacier surface change, melt generation and runoff, McMurdo Dry Valleys, Antarctica |
author_facet |
Bergstrom, Anna Gooseff, Michael Fountain, Andrew Hoffman, Matthew |
author_sort |
Bergstrom, Anna |
title |
Long‐term shifts in feedbacks among glacier surface change, melt generation and runoff, McMurdo Dry Valleys, Antarctica |
title_short |
Long‐term shifts in feedbacks among glacier surface change, melt generation and runoff, McMurdo Dry Valleys, Antarctica |
title_full |
Long‐term shifts in feedbacks among glacier surface change, melt generation and runoff, McMurdo Dry Valleys, Antarctica |
title_fullStr |
Long‐term shifts in feedbacks among glacier surface change, melt generation and runoff, McMurdo Dry Valleys, Antarctica |
title_full_unstemmed |
Long‐term shifts in feedbacks among glacier surface change, melt generation and runoff, McMurdo Dry Valleys, Antarctica |
title_sort |
long‐term shifts in feedbacks among glacier surface change, melt generation and runoff, mcmurdo dry valleys, antarctica |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/hyp.14292 https://onlinelibrary.wiley.com/doi/pdf/10.1002/hyp.14292 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/hyp.14292 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002/hyp.14292 |
geographic |
McMurdo Dry Valleys |
geographic_facet |
McMurdo Dry Valleys |
genre |
Antarc* Antarctica McMurdo Dry Valleys polar desert |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys polar desert |
op_source |
Hydrological Processes volume 35, issue 8 ISSN 0885-6087 1099-1085 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/hyp.14292 |
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Hydrological Processes |
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35 |
container_issue |
8 |
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1800738274047688704 |