Snow grain-size measurements in Antarctica
International audience Grain-size is an important but not well-known characteristic of snow at the surface of Antarctica. In the past, grain-size has been reported using various methods, the reliability, reproducibility and intercomparability of which is not warranted. In this paper, we present and...
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ftunivnantes:oai:HAL:hal-00645916v1 2023-05-15T13:39:16+02:00 Snow grain-size measurements in Antarctica Gay, Michel Fily, Michel Frezzotti, Massimo Genthon, Christophe Oerter, Hans Winther, J.-G. 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) Ente per le Nuove Tecnologie, l'Energia e l'Ambiente (ENEA) Centro Ricerche Casaccia Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie Universität Heidelberg Heidelberg Norwegian Polar Institute 2002-08-15 https://hal.archives-ouvertes.fr/hal-00645916 https://hal.archives-ouvertes.fr/hal-00645916/document https://hal.archives-ouvertes.fr/hal-00645916/file/Gay2002a.pdf en eng HAL CCSD International Glaciological Society hal-00645916 https://hal.archives-ouvertes.fr/hal-00645916 https://hal.archives-ouvertes.fr/hal-00645916/document https://hal.archives-ouvertes.fr/hal-00645916/file/Gay2002a.pdf info:eu-repo/semantics/OpenAccess ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.archives-ouvertes.fr/hal-00645916 Journal of Glaciology, International Glaciological Society, 2002, 48 (163), pp. 527-535 [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2002 ftunivnantes 2022-11-01T23:57:56Z International audience Grain-size is an important but not well-known characteristic of snow at the surface of Antarctica. In the past, grain-size has been reported using various methods, the reliability, reproducibility and intercomparability of which is not warranted. In this paper, we present and recommend, depending on available logistical support, three tech- niques of snow-grain sampling and/or imaging in the field as well as an original digital image-processing method, which we have proved provides reproducible and intercompar- able measures of a snow grain-size parameter, the mean convex radius. Results from more than 500 samples and 3000 images of snow grains are presented, which yield a still spatially limited yet unprecedentedly wide picture of near-surface snow grain-size distribution from fieldwork in Antarctica. In particular, except at sites affected by a very particular meteor- ology, surface grains in the interior of the ice sheet are uniformly small (0.1^0.2 mm). The climate-related increase of grain-size with depth through metamorphism is, as expected, not spatially uniform. Our Antarctic snow grain-size database will continue to grow as field investigations bring new samples, images and measures of snow grain. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Journal of Glaciology Université de Nantes: HAL-UNIV-NANTES Antarctic |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Gay, Michel Fily, Michel Frezzotti, Massimo Genthon, Christophe Oerter, Hans Winther, J.-G. Snow grain-size measurements in Antarctica |
topic_facet |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience Grain-size is an important but not well-known characteristic of snow at the surface of Antarctica. In the past, grain-size has been reported using various methods, the reliability, reproducibility and intercomparability of which is not warranted. In this paper, we present and recommend, depending on available logistical support, three tech- niques of snow-grain sampling and/or imaging in the field as well as an original digital image-processing method, which we have proved provides reproducible and intercompar- able measures of a snow grain-size parameter, the mean convex radius. Results from more than 500 samples and 3000 images of snow grains are presented, which yield a still spatially limited yet unprecedentedly wide picture of near-surface snow grain-size distribution from fieldwork in Antarctica. In particular, except at sites affected by a very particular meteor- ology, surface grains in the interior of the ice sheet are uniformly small (0.1^0.2 mm). The climate-related increase of grain-size with depth through metamorphism is, as expected, not spatially uniform. Our Antarctic snow grain-size database will continue to grow as field investigations bring new samples, images and measures of snow grain. |
author2 |
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) Ente per le Nuove Tecnologie, l'Energia e l'Ambiente (ENEA) Centro Ricerche Casaccia Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie Universität Heidelberg Heidelberg Norwegian Polar Institute |
format |
Article in Journal/Newspaper |
author |
Gay, Michel Fily, Michel Frezzotti, Massimo Genthon, Christophe Oerter, Hans Winther, J.-G. |
author_facet |
Gay, Michel Fily, Michel Frezzotti, Massimo Genthon, Christophe Oerter, Hans Winther, J.-G. |
author_sort |
Gay, Michel |
title |
Snow grain-size measurements in Antarctica |
title_short |
Snow grain-size measurements in Antarctica |
title_full |
Snow grain-size measurements in Antarctica |
title_fullStr |
Snow grain-size measurements in Antarctica |
title_full_unstemmed |
Snow grain-size measurements in Antarctica |
title_sort |
snow grain-size measurements in antarctica |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.archives-ouvertes.fr/hal-00645916 https://hal.archives-ouvertes.fr/hal-00645916/document https://hal.archives-ouvertes.fr/hal-00645916/file/Gay2002a.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Journal of Glaciology |
op_source |
ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.archives-ouvertes.fr/hal-00645916 Journal of Glaciology, International Glaciological Society, 2002, 48 (163), pp. 527-535 |
op_relation |
hal-00645916 https://hal.archives-ouvertes.fr/hal-00645916 https://hal.archives-ouvertes.fr/hal-00645916/document https://hal.archives-ouvertes.fr/hal-00645916/file/Gay2002a.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766116674858123264 |