Meteorological and snow accumulation gradients across Dome C, East Antarctic plateau
International audience In situ observations show that snow accumulation is ∼10% larger 25 km north than south of the summit of DomeC on the east antarctic plateau. The mean wind direction is southerly. Although a slight slope-related diverging katabatic owcomponent is detectable, the area is an ess...
Published in: | International Journal of Climatology |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-01326307 https://doi.org/10.1002/joc.4362 |
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ftccsdartic:oai:HAL:insu-01326307v1 2023-05-15T13:31:46+02:00 Meteorological and snow accumulation gradients across Dome C, East Antarctic plateau Genthon, Christophe Six, Delphine Scarchilli, C. Frezzotti, M. Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG ) 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 Grenoble Alpes 2016-2019 (UGA 2016-2019 )-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 Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Centre National de la Recherche Scientifique (CNRS) Italian National agency for new technologies, Energy and sustainable economic development Frascati (ENEA) 2016 https://hal-insu.archives-ouvertes.fr/insu-01326307 https://doi.org/10.1002/joc.4362 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1002/joc.4362 insu-01326307 https://hal-insu.archives-ouvertes.fr/insu-01326307 doi:10.1002/joc.4362 ISSN: 0899-8418 EISSN: 1097-0088 International Journal of Climatology https://hal-insu.archives-ouvertes.fr/insu-01326307 International Journal of Climatology, Wiley, 2016, 36, pp.455-466. ⟨10.1002/joc.4362⟩ Antarctic plateau surface meteorology surface mass balance spatial gradients [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2016 ftccsdartic https://doi.org/10.1002/joc.4362 2021-11-07T04:18:38Z International audience In situ observations show that snow accumulation is ∼10% larger 25 km north than south of the summit of DomeC on the east antarctic plateau. The mean wind direction is southerly. Although a slight slope-related diverging katabatic owcomponent is detectable, the area is an essentially at (∼10 m elevation change or less) homogeneous snow surface. TheEuropean Center for Medium-range Weather Forecasts meteorological analyses data reproduce a signicant accumulationgradient and suggest that 90% of the the mean accumulation results from the 25% largest precipitation events. During theseevents, air masses originate from coastal areas in the north rather than from inland in the south. Radiative cooling condensationoccurs on the way across the dome and as the moisture reservoir is depleted less snow is dumped 25 km south than north, withlittle direct impact from the local (50-km scale) topography. Air masses are warmer on average, and warmer north than south,when originating from the coast. This marginally affects the mean temperature gradients. The moisture gradients are moreaffected because moisture is nonlinearly related to temperature: the mean atmospheric moisture is larger north than south.Signicant meteorological and hydrological gradients over such relatively small distances (50 km) over locally at regionmay be an issue when interpreting ice cores: although cores are drilled at the top of domes and ridges where the slopes andelevation gradients are minimal, they sample small surfaces in areas affected by signicant meteorological and hydrologicalspatial gradients. Article in Journal/Newspaper Antarc* Antarctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic International Journal of Climatology 36 1 455 466 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Antarctic plateau surface meteorology surface mass balance spatial gradients [SDE]Environmental Sciences |
spellingShingle |
Antarctic plateau surface meteorology surface mass balance spatial gradients [SDE]Environmental Sciences Genthon, Christophe Six, Delphine Scarchilli, C. Frezzotti, M. Meteorological and snow accumulation gradients across Dome C, East Antarctic plateau |
topic_facet |
Antarctic plateau surface meteorology surface mass balance spatial gradients [SDE]Environmental Sciences |
description |
International audience In situ observations show that snow accumulation is ∼10% larger 25 km north than south of the summit of DomeC on the east antarctic plateau. The mean wind direction is southerly. Although a slight slope-related diverging katabatic owcomponent is detectable, the area is an essentially at (∼10 m elevation change or less) homogeneous snow surface. TheEuropean Center for Medium-range Weather Forecasts meteorological analyses data reproduce a signicant accumulationgradient and suggest that 90% of the the mean accumulation results from the 25% largest precipitation events. During theseevents, air masses originate from coastal areas in the north rather than from inland in the south. Radiative cooling condensationoccurs on the way across the dome and as the moisture reservoir is depleted less snow is dumped 25 km south than north, withlittle direct impact from the local (50-km scale) topography. Air masses are warmer on average, and warmer north than south,when originating from the coast. This marginally affects the mean temperature gradients. The moisture gradients are moreaffected because moisture is nonlinearly related to temperature: the mean atmospheric moisture is larger north than south.Signicant meteorological and hydrological gradients over such relatively small distances (50 km) over locally at regionmay be an issue when interpreting ice cores: although cores are drilled at the top of domes and ridges where the slopes andelevation gradients are minimal, they sample small surfaces in areas affected by signicant meteorological and hydrologicalspatial gradients. |
author2 |
Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG ) 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 Grenoble Alpes 2016-2019 (UGA 2016-2019 )-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 Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Centre National de la Recherche Scientifique (CNRS) Italian National agency for new technologies, Energy and sustainable economic development Frascati (ENEA) |
format |
Article in Journal/Newspaper |
author |
Genthon, Christophe Six, Delphine Scarchilli, C. Frezzotti, M. |
author_facet |
Genthon, Christophe Six, Delphine Scarchilli, C. Frezzotti, M. |
author_sort |
Genthon, Christophe |
title |
Meteorological and snow accumulation gradients across Dome C, East Antarctic plateau |
title_short |
Meteorological and snow accumulation gradients across Dome C, East Antarctic plateau |
title_full |
Meteorological and snow accumulation gradients across Dome C, East Antarctic plateau |
title_fullStr |
Meteorological and snow accumulation gradients across Dome C, East Antarctic plateau |
title_full_unstemmed |
Meteorological and snow accumulation gradients across Dome C, East Antarctic plateau |
title_sort |
meteorological and snow accumulation gradients across dome c, east antarctic plateau |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01326307 https://doi.org/10.1002/joc.4362 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0899-8418 EISSN: 1097-0088 International Journal of Climatology https://hal-insu.archives-ouvertes.fr/insu-01326307 International Journal of Climatology, Wiley, 2016, 36, pp.455-466. ⟨10.1002/joc.4362⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/joc.4362 insu-01326307 https://hal-insu.archives-ouvertes.fr/insu-01326307 doi:10.1002/joc.4362 |
op_doi |
https://doi.org/10.1002/joc.4362 |
container_title |
International Journal of Climatology |
container_volume |
36 |
container_issue |
1 |
container_start_page |
455 |
op_container_end_page |
466 |
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1766020824260673536 |