Long-term shifts in feedbacks among glacier surface change, melt generation and runoff, McMurdo Dry Valleys, Antarctica
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. In this work, we demonstrate that increased surface roughness, which...
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ftosti:oai:osti.gov:1823761 2023-07-30T03:58:28+02:00 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 2022-08-22 application/pdf http://www.osti.gov/servlets/purl/1823761 https://www.osti.gov/biblio/1823761 https://doi.org/10.1002/hyp.14292 unknown http://www.osti.gov/servlets/purl/1823761 https://www.osti.gov/biblio/1823761 https://doi.org/10.1002/hyp.14292 doi:10.1002/hyp.14292 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1002/hyp.14292 2023-07-11T10:07:24Z 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. In this work, 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. Other/Unknown Material Antarc* Antarctica McMurdo Dry Valleys polar desert SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) McMurdo Dry Valleys Hydrological Processes 35 8 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES 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 |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
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. In this work, 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. |
author |
Bergstrom, Anna Gooseff, Michael Fountain, Andrew Hoffman, Matthew |
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 |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1823761 https://www.osti.gov/biblio/1823761 https://doi.org/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_relation |
http://www.osti.gov/servlets/purl/1823761 https://www.osti.gov/biblio/1823761 https://doi.org/10.1002/hyp.14292 doi:10.1002/hyp.14292 |
op_doi |
https://doi.org/10.1002/hyp.14292 |
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Hydrological Processes |
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35 |
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8 |
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1772821254383861760 |