Data issues in a moving environment: remote and in situ tools to monitor glacier dynamics and their hydrological consequences in the Austre Lovènbreen basin
COM International audience The precise quantification of glacier movements over time is one of the goals of glaciology. Understanding how and where ice is appearing, melting, and what happens once it’s gone are at the core of the Hydro - Se nsor - FlOWS program (IPY #16, IPEV 304, ANR 0310) that j...
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fttriple:oai:gotriple.eu:10670/1.wizq98 2023-05-15T16:21:56+02:00 Data issues in a moving environment: remote and in situ tools to monitor glacier dynamics and their hydrological consequences in the Austre Lovènbreen basin Tolle, Florian Bernard, Eric Friedt, Jean-Michel Saintenoy, Albane Marlin, Christelle Griselin, Madeleine Théoriser et modéliser pour aménager (UMR 6049) (ThéMA) Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB) Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST) Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC)-Centre National de la Recherche Scientifique (CNRS) Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Kjeller, Norway 2011-10-25 https://hal.archives-ouvertes.fr/hal-00864532 en eng HAL CCSD hal-00864532 10670/1.wizq98 https://hal.archives-ouvertes.fr/hal-00864532 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société 10th Ny-Ålesund Seminar 10th Ny-Ålesund Seminar, Oct 2011, Kjeller, Norway geo envir Conference Output https://vocabularies.coar-repositories.org/resource_types/c_c94f/ 2011 fttriple 2023-01-22T17:03:21Z COM International audience The precise quantification of glacier movements over time is one of the goals of glaciology. Understanding how and where ice is appearing, melting, and what happens once it’s gone are at the core of the Hydro - Se nsor - FlOWS program (IPY #16, IPEV 304, ANR 0310) that just ended and will be one of the aspects of the new Cryo - Sensors program. Obtaining a precise digital elevation model (DEM) of a glacier surface is not straightforward. When using old datasets, caution should be applied to the interpretation made of the results as the variability tends to increase. Recent monitoring techniques (DGPS, airborne Lidar) do provide a higher level of accuracy but still require a good knowledge of technology and its drawbacks, as well as field - specific issues (i.e. snow cover). Mass balance computations have been applied to Austre Lovénbreen using such techniques. When compared to ablation stakes measurements, results show striking differences, especially in accumulation areas. In areas where stakes do record accumulation, DEM differences account for ablation only. And the ablation measured using DEM seems greater than the vertical velocity of the glacier. Could it be possible that these two techniques do record processes occurr ing at the same time but at different scales? While stakes are measuring surface ice evolution only, DEM calculations are documenting the general trend of the glacier. It is possible that new ice is appearing in the upper cirques of the glacier while at th e scale of the basin, the glacier is in a global retreat trend. We are currently attempting to instrument the glacier in order to confirm our hypothesis and to quantify its extent. In an effort to precisely compute the volume of ice constituting today's gl acier, the surface DEM had to be complemented with a model of the bedrock on which the glacier is flowing. Ground Penetrating Radar (GPR) was used to get precise elevation values of the ice - rock interface. The difference between surface and bedrock DEM ... Other/Unknown Material glacier IPY Unknown Norway |
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fttriple |
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English |
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geo envir |
spellingShingle |
geo envir Tolle, Florian Bernard, Eric Friedt, Jean-Michel Saintenoy, Albane Marlin, Christelle Griselin, Madeleine Data issues in a moving environment: remote and in situ tools to monitor glacier dynamics and their hydrological consequences in the Austre Lovènbreen basin |
topic_facet |
geo envir |
description |
COM International audience The precise quantification of glacier movements over time is one of the goals of glaciology. Understanding how and where ice is appearing, melting, and what happens once it’s gone are at the core of the Hydro - Se nsor - FlOWS program (IPY #16, IPEV 304, ANR 0310) that just ended and will be one of the aspects of the new Cryo - Sensors program. Obtaining a precise digital elevation model (DEM) of a glacier surface is not straightforward. When using old datasets, caution should be applied to the interpretation made of the results as the variability tends to increase. Recent monitoring techniques (DGPS, airborne Lidar) do provide a higher level of accuracy but still require a good knowledge of technology and its drawbacks, as well as field - specific issues (i.e. snow cover). Mass balance computations have been applied to Austre Lovénbreen using such techniques. When compared to ablation stakes measurements, results show striking differences, especially in accumulation areas. In areas where stakes do record accumulation, DEM differences account for ablation only. And the ablation measured using DEM seems greater than the vertical velocity of the glacier. Could it be possible that these two techniques do record processes occurr ing at the same time but at different scales? While stakes are measuring surface ice evolution only, DEM calculations are documenting the general trend of the glacier. It is possible that new ice is appearing in the upper cirques of the glacier while at th e scale of the basin, the glacier is in a global retreat trend. We are currently attempting to instrument the glacier in order to confirm our hypothesis and to quantify its extent. In an effort to precisely compute the volume of ice constituting today's gl acier, the surface DEM had to be complemented with a model of the bedrock on which the glacier is flowing. Ground Penetrating Radar (GPR) was used to get precise elevation values of the ice - rock interface. The difference between surface and bedrock DEM ... |
author2 |
Théoriser et modéliser pour aménager (UMR 6049) (ThéMA) Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB) Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST) Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC)-Centre National de la Recherche Scientifique (CNRS) Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) |
format |
Other/Unknown Material |
author |
Tolle, Florian Bernard, Eric Friedt, Jean-Michel Saintenoy, Albane Marlin, Christelle Griselin, Madeleine |
author_facet |
Tolle, Florian Bernard, Eric Friedt, Jean-Michel Saintenoy, Albane Marlin, Christelle Griselin, Madeleine |
author_sort |
Tolle, Florian |
title |
Data issues in a moving environment: remote and in situ tools to monitor glacier dynamics and their hydrological consequences in the Austre Lovènbreen basin |
title_short |
Data issues in a moving environment: remote and in situ tools to monitor glacier dynamics and their hydrological consequences in the Austre Lovènbreen basin |
title_full |
Data issues in a moving environment: remote and in situ tools to monitor glacier dynamics and their hydrological consequences in the Austre Lovènbreen basin |
title_fullStr |
Data issues in a moving environment: remote and in situ tools to monitor glacier dynamics and their hydrological consequences in the Austre Lovènbreen basin |
title_full_unstemmed |
Data issues in a moving environment: remote and in situ tools to monitor glacier dynamics and their hydrological consequences in the Austre Lovènbreen basin |
title_sort |
data issues in a moving environment: remote and in situ tools to monitor glacier dynamics and their hydrological consequences in the austre lovènbreen basin |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.archives-ouvertes.fr/hal-00864532 |
op_coverage |
Kjeller, Norway |
geographic |
Norway |
geographic_facet |
Norway |
genre |
glacier IPY |
genre_facet |
glacier IPY |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société 10th Ny-Ålesund Seminar 10th Ny-Ålesund Seminar, Oct 2011, Kjeller, Norway |
op_relation |
hal-00864532 10670/1.wizq98 https://hal.archives-ouvertes.fr/hal-00864532 |
op_rights |
undefined |
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1766009908050788352 |