Why do the dark and light ogives of Forbes bands have similar surface mass balances?
ABSTRACT Band ogives are a striking and enigmatic feature of Mer de Glace glacier flow. The surface mass balances (SMBs) of these ogives have been thoroughly investigated over a period of 12 years. We find similar cumulative SMBs over this period, ranging between −64.1 and −66.2 m w.e., on the dark...
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/jog.2018.12 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000126 |
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crcambridgeupr:10.1017/jog.2018.12 2024-03-03T08:46:06+00:00 Why do the dark and light ogives of Forbes bands have similar surface mass balances? VINCENT, C. DUMONT, M. SIX, D. BRUN, F. PICARD, G. ARNAUD, L. 2018 http://dx.doi.org/10.1017/jog.2018.12 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000126 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 64, issue 244, page 236-246 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2018 crcambridgeupr https://doi.org/10.1017/jog.2018.12 2024-02-08T08:32:34Z ABSTRACT Band ogives are a striking and enigmatic feature of Mer de Glace glacier flow. The surface mass balances (SMBs) of these ogives have been thoroughly investigated over a period of 12 years. We find similar cumulative SMBs over this period, ranging between −64.1 and −66.2 m w.e., on the dark and light ogives even though the dark ogive albedo is ~40% lower than that of the light ogives. We, therefore, looked for another process that could compensate for the large difference of absorbed short-wave radiation between dark and light ogives. Based on in situ roughness measurements, our numerical modeling experiments demonstrate that a significant difference in turbulent flux over the dark and light ogives due to different surface roughnesses could compensate for the difference in radiative forcing. Our results discard theories for the genesis of band ogives that are based on the assumption of a strong ice ablation contrast between dark and light ogives. More generally, our study demonstrates that future roughness changes are as important to analyze as the radiative impacts of a potential increase of aerosols or debris at the surface of glaciers. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Forbes ENVELOPE(-66.550,-66.550,-67.783,-67.783) Journal of Glaciology 64 244 236 246 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes VINCENT, C. DUMONT, M. SIX, D. BRUN, F. PICARD, G. ARNAUD, L. Why do the dark and light ogives of Forbes bands have similar surface mass balances? |
topic_facet |
Earth-Surface Processes |
description |
ABSTRACT Band ogives are a striking and enigmatic feature of Mer de Glace glacier flow. The surface mass balances (SMBs) of these ogives have been thoroughly investigated over a period of 12 years. We find similar cumulative SMBs over this period, ranging between −64.1 and −66.2 m w.e., on the dark and light ogives even though the dark ogive albedo is ~40% lower than that of the light ogives. We, therefore, looked for another process that could compensate for the large difference of absorbed short-wave radiation between dark and light ogives. Based on in situ roughness measurements, our numerical modeling experiments demonstrate that a significant difference in turbulent flux over the dark and light ogives due to different surface roughnesses could compensate for the difference in radiative forcing. Our results discard theories for the genesis of band ogives that are based on the assumption of a strong ice ablation contrast between dark and light ogives. More generally, our study demonstrates that future roughness changes are as important to analyze as the radiative impacts of a potential increase of aerosols or debris at the surface of glaciers. |
format |
Article in Journal/Newspaper |
author |
VINCENT, C. DUMONT, M. SIX, D. BRUN, F. PICARD, G. ARNAUD, L. |
author_facet |
VINCENT, C. DUMONT, M. SIX, D. BRUN, F. PICARD, G. ARNAUD, L. |
author_sort |
VINCENT, C. |
title |
Why do the dark and light ogives of Forbes bands have similar surface mass balances? |
title_short |
Why do the dark and light ogives of Forbes bands have similar surface mass balances? |
title_full |
Why do the dark and light ogives of Forbes bands have similar surface mass balances? |
title_fullStr |
Why do the dark and light ogives of Forbes bands have similar surface mass balances? |
title_full_unstemmed |
Why do the dark and light ogives of Forbes bands have similar surface mass balances? |
title_sort |
why do the dark and light ogives of forbes bands have similar surface mass balances? |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/jog.2018.12 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000126 |
long_lat |
ENVELOPE(-66.550,-66.550,-67.783,-67.783) |
geographic |
Forbes |
geographic_facet |
Forbes |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 64, issue 244, page 236-246 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2018.12 |
container_title |
Journal of Glaciology |
container_volume |
64 |
container_issue |
244 |
container_start_page |
236 |
op_container_end_page |
246 |
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1792501991030652928 |