Measured and modelled sublimation on the tropical Glaciar Artesonraju, Perú
International audience Sublimation plays a decisive role in the surface energy and mass balance of tropical glaciers. During the dry season (May-September) low specific humidity and high surface roughness favour the direct transition from ice to vapour and drastically reduce the energy available for...
Published in: | The Cryosphere |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2009
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Online Access: | https://insu.hal.science/insu-00421261 https://insu.hal.science/insu-00421261/document https://insu.hal.science/insu-00421261/file/tc-3-21-2009.pdf https://doi.org/10.5194/tc-3-21-2009 |
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ftunivsavoie:oai:HAL:insu-00421261v1 |
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Open Polar |
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Université Savoie Mont Blanc: HAL |
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ftunivsavoie |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Winkler, M. Juen, I. Mölg, T. Wagnon, Patrick Gómez, J. Kaser, G. Measured and modelled sublimation on the tropical Glaciar Artesonraju, Perú |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Sublimation plays a decisive role in the surface energy and mass balance of tropical glaciers. During the dry season (May-September) low specific humidity and high surface roughness favour the direct transition from ice to vapour and drastically reduce the energy available for melting. However, field measurements are scarce and little is known about the performance of sublimation parameterisations in glacier mass balance and runoff models. During 15 days in August 2005 sublimation was measured on the tongue of Glaciar Artesonraju (8°58' S, 77°38' W) in the Cordillera Blanca, Perú, using simple lysimeters. Indicating a strong dependence on surface roughness, daily totals of sublimation range from 1-3 kg m−2 for smooth to 2-5 kg m−2 for rough conditions. (The 15-day means at that time of wind speed and specific humidity were 4.3 m s−1 and 3.8 g kg−1, respectively.) Measured sublimation was related to characteristic surface roughness lengths for momentum (zm) and for the scalar quantities of temperature and water vapour (zs), using a process-based mass balance model. Input data were provided by automatic weather stations, situated on the glacier tongue at 4750 m a.s.l. and 4810 m a.s.l., respectively. Under smooth conditions the combination zm=2.0 mm and zs=1.0 mm appeared to be most appropriate, for rough conditions zm=20.0 mm and zs=10.0 mm fitted best. Extending the sublimation record from April 2004 to December 2005 with the process-based model confirms, that sublimation shows a clear seasonality. 60-90% of the energy available for ablation is consumed by sublimation in the dry season, but only 10-15% in the wet season (October-April). The findings are finally used to evaluate the parameterisation of sublimation in the lower-complexity mass balance model ITGG, which has the advantage of requiring precipitation and air temperature as only input data. It turns out that the implementation of mean wind speed is a possible improvement for the representation of sublimation in the ITGG model. |
author2 |
Tropical Glaciology Group, Faculty of Geo- and Atmospheric Sciences Leopold Franzens Universität Innsbruck - University of Innsbruck Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Unidad de Glaciología y Recursos Hídricos Austrian Science Foundation (FWF) grants number P16113-N06 and P20089-N10. |
format |
Article in Journal/Newspaper |
author |
Winkler, M. Juen, I. Mölg, T. Wagnon, Patrick Gómez, J. Kaser, G. |
author_facet |
Winkler, M. Juen, I. Mölg, T. Wagnon, Patrick Gómez, J. Kaser, G. |
author_sort |
Winkler, M. |
title |
Measured and modelled sublimation on the tropical Glaciar Artesonraju, Perú |
title_short |
Measured and modelled sublimation on the tropical Glaciar Artesonraju, Perú |
title_full |
Measured and modelled sublimation on the tropical Glaciar Artesonraju, Perú |
title_fullStr |
Measured and modelled sublimation on the tropical Glaciar Artesonraju, Perú |
title_full_unstemmed |
Measured and modelled sublimation on the tropical Glaciar Artesonraju, Perú |
title_sort |
measured and modelled sublimation on the tropical glaciar artesonraju, perú |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://insu.hal.science/insu-00421261 https://insu.hal.science/insu-00421261/document https://insu.hal.science/insu-00421261/file/tc-3-21-2009.pdf https://doi.org/10.5194/tc-3-21-2009 |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://insu.hal.science/insu-00421261 The Cryosphere, 2009, 3 (1), pp.21-30. ⟨10.5194/tc-3-21-2009⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-3-21-2009 insu-00421261 https://insu.hal.science/insu-00421261 https://insu.hal.science/insu-00421261/document https://insu.hal.science/insu-00421261/file/tc-3-21-2009.pdf doi:10.5194/tc-3-21-2009 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-3-21-2009 |
container_title |
The Cryosphere |
container_volume |
3 |
container_issue |
1 |
container_start_page |
21 |
op_container_end_page |
30 |
_version_ |
1798834144874070016 |
spelling |
ftunivsavoie:oai:HAL:insu-00421261v1 2024-05-12T08:11:55+00:00 Measured and modelled sublimation on the tropical Glaciar Artesonraju, Perú Winkler, M. Juen, I. Mölg, T. Wagnon, Patrick Gómez, J. Kaser, G. Tropical Glaciology Group, Faculty of Geo- and Atmospheric Sciences Leopold Franzens Universität Innsbruck - University of Innsbruck Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Unidad de Glaciología y Recursos Hídricos Austrian Science Foundation (FWF) grants number P16113-N06 and P20089-N10. 2009-02-09 https://insu.hal.science/insu-00421261 https://insu.hal.science/insu-00421261/document https://insu.hal.science/insu-00421261/file/tc-3-21-2009.pdf https://doi.org/10.5194/tc-3-21-2009 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-3-21-2009 insu-00421261 https://insu.hal.science/insu-00421261 https://insu.hal.science/insu-00421261/document https://insu.hal.science/insu-00421261/file/tc-3-21-2009.pdf doi:10.5194/tc-3-21-2009 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://insu.hal.science/insu-00421261 The Cryosphere, 2009, 3 (1), pp.21-30. ⟨10.5194/tc-3-21-2009⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2009 ftunivsavoie https://doi.org/10.5194/tc-3-21-2009 2024-04-18T00:27:53Z International audience Sublimation plays a decisive role in the surface energy and mass balance of tropical glaciers. During the dry season (May-September) low specific humidity and high surface roughness favour the direct transition from ice to vapour and drastically reduce the energy available for melting. However, field measurements are scarce and little is known about the performance of sublimation parameterisations in glacier mass balance and runoff models. During 15 days in August 2005 sublimation was measured on the tongue of Glaciar Artesonraju (8°58' S, 77°38' W) in the Cordillera Blanca, Perú, using simple lysimeters. Indicating a strong dependence on surface roughness, daily totals of sublimation range from 1-3 kg m−2 for smooth to 2-5 kg m−2 for rough conditions. (The 15-day means at that time of wind speed and specific humidity were 4.3 m s−1 and 3.8 g kg−1, respectively.) Measured sublimation was related to characteristic surface roughness lengths for momentum (zm) and for the scalar quantities of temperature and water vapour (zs), using a process-based mass balance model. Input data were provided by automatic weather stations, situated on the glacier tongue at 4750 m a.s.l. and 4810 m a.s.l., respectively. Under smooth conditions the combination zm=2.0 mm and zs=1.0 mm appeared to be most appropriate, for rough conditions zm=20.0 mm and zs=10.0 mm fitted best. Extending the sublimation record from April 2004 to December 2005 with the process-based model confirms, that sublimation shows a clear seasonality. 60-90% of the energy available for ablation is consumed by sublimation in the dry season, but only 10-15% in the wet season (October-April). The findings are finally used to evaluate the parameterisation of sublimation in the lower-complexity mass balance model ITGG, which has the advantage of requiring precipitation and air temperature as only input data. It turns out that the implementation of mean wind speed is a possible improvement for the representation of sublimation in the ITGG model. Article in Journal/Newspaper The Cryosphere Université Savoie Mont Blanc: HAL The Cryosphere 3 1 21 30 |