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-02580795v1 2023-05-15T13:53:56+02:00 Snow grain size measurements in Antarctica Mesure de la taille des grains en Antarctique Gay, M. Fily, Marie-Christine Genthon, C. Frezzotti, M. Oerter, H. Winther, J. Centre National de la Recherche Scientifique (CNRS) Érosion torrentielle, neige et avalanches (UR ETGR (ETNA)) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) ENEA ROME ITA Partenaires IRSTEA Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) ALFRED WEGENER INSTITUTE FOR POLAR AND MARINE RESEARCH BREMERHAVEN DEU NORWEGIAN POLAR INSTITUTE TROMSE NOR 2002 https://hal.inrae.fr/hal-02580795 en eng HAL CCSD International Glaciological Society hal-02580795 https://hal.inrae.fr/hal-02580795 IRSTEA: PUB00010743 ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.inrae.fr/hal-02580795 Journal of Glaciology, International Glaciological Society, 2002, 48 (16), pp.17 ANTARCTIQUE [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2002 ftunivnantes 2022-11-02T01:08:22Z 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, 3 techniques of snow grain sampling and/or imaging in the field as well as an original digital image processing method, which we have proved to provide reproducible and intercomparable 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 field work in Antarctica. In particular, except at sites affected by a very particular meteorology, surface grains in the interior of the ice sheet are uniformly small (0.1 to 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. La taille des grains de neige est un paramètre important des caractéristiques de la neige de surface de l'Antarctique. Dans le passé, la taille des grains de neige a été déterminée par différentes méthodes. La précision, la reproductibilité ainsi que l'inter comparaison n'étaient pas garanties. Nous présentons dans ce papier trois techniques de prise d'échantillons et de prise d'images de grains de neige sur site ainsi qu'une méthode originale de traitement d'images, permettant de réaliser des mesures comparables et reproductibles de la taille de grain de neige. Le paramètre retenu en 2D de la taille des grains de neige est le rayon convexe moyen. Des mesures de 500 échantillons et 3000 images de grains de neige sont présentés spatialement limité. Cependant actuellement aucune mesure ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Antarctique* Ice Sheet Journal of Glaciology Université de Nantes: HAL-UNIV-NANTES Antarctic |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
ANTARCTIQUE [SDE]Environmental Sciences |
spellingShingle |
ANTARCTIQUE [SDE]Environmental Sciences Gay, M. Fily, Marie-Christine Genthon, C. Frezzotti, M. Oerter, H. Winther, J. Snow grain size measurements in Antarctica |
topic_facet |
ANTARCTIQUE [SDE]Environmental Sciences |
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, 3 techniques of snow grain sampling and/or imaging in the field as well as an original digital image processing method, which we have proved to provide reproducible and intercomparable 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 field work in Antarctica. In particular, except at sites affected by a very particular meteorology, surface grains in the interior of the ice sheet are uniformly small (0.1 to 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. La taille des grains de neige est un paramètre important des caractéristiques de la neige de surface de l'Antarctique. Dans le passé, la taille des grains de neige a été déterminée par différentes méthodes. La précision, la reproductibilité ainsi que l'inter comparaison n'étaient pas garanties. Nous présentons dans ce papier trois techniques de prise d'échantillons et de prise d'images de grains de neige sur site ainsi qu'une méthode originale de traitement d'images, permettant de réaliser des mesures comparables et reproductibles de la taille de grain de neige. Le paramètre retenu en 2D de la taille des grains de neige est le rayon convexe moyen. Des mesures de 500 échantillons et 3000 images de grains de neige sont présentés spatialement limité. Cependant actuellement aucune mesure ... |
author2 |
Centre National de la Recherche Scientifique (CNRS) Érosion torrentielle, neige et avalanches (UR ETGR (ETNA)) Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) ENEA ROME ITA Partenaires IRSTEA Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) ALFRED WEGENER INSTITUTE FOR POLAR AND MARINE RESEARCH BREMERHAVEN DEU NORWEGIAN POLAR INSTITUTE TROMSE NOR |
format |
Article in Journal/Newspaper |
author |
Gay, M. Fily, Marie-Christine Genthon, C. Frezzotti, M. Oerter, H. Winther, J. |
author_facet |
Gay, M. Fily, Marie-Christine Genthon, C. Frezzotti, M. Oerter, H. Winther, J. |
author_sort |
Gay, M. |
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.inrae.fr/hal-02580795 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica Antarctique* Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctica Antarctique* Ice Sheet Journal of Glaciology |
op_source |
ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.inrae.fr/hal-02580795 Journal of Glaciology, International Glaciological Society, 2002, 48 (16), pp.17 |
op_relation |
hal-02580795 https://hal.inrae.fr/hal-02580795 IRSTEA: PUB00010743 |
_version_ |
1766259412585938944 |