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Author:
Publisher:
ISBN:
Category : Ice coring rigs
Languages : en
Pages : 164
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Author:
Publisher:
ISBN:
Category : Ice coring rigs
Languages : en
Pages : 164
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Author:
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 340
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Author:
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Category : Glaciology
Languages : en
Pages : 156
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"This report documents most of the ice cores so far collected on a world-wide basis, as well as providing information on literature sources and on the currents status of research activities which may affect the types of data that can be archived."--Foreword.
Author: Pascal Lacroix
Publisher: Omniscriptum
ISBN: 9786131512339
Category :
Languages : fr
Pages : 152
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La calotte polaire antarctique est constituée d'une épaisse couche de glace surmontée d'un névé d'une centaine de mètres d'épaisseur. Les observations satellites ont permis depuis bientôt 40 ans de fournir de nombreuses informations sur sa topographie et quelques propriétés de sa surface. Cependant la connaissance de son manteau neigeux est encore très limitée. Les précipitations qui se déposent sont balayées par les vents, s'accumulent pour former des couches. En s'enfouissant, les grains de neige qui les constituent subissent un métamorphisme qui modifie leur taille et leurs caractéristiques. Hors, Les taux d'accumulations ou les tailles des grains de neige, sont des indicateurs climatiques clés, jusqu'alors mal connus. Depuis 2002 et le lancement du satellite ENVISAT, un altimètre radar couvre 80% de la calotte polaire Antarctique, avec la particularité d'acquérir des signaux à deux fréquences différentes (3.2 GHz et 13.6 GHz). Ces deux ondes pénètrent dans le manteau neigeux sur plusieurs mètres et ont des sensibilités aux propriétés de la neige différentes. L'idée de cette thèse est d'utiliser ces données pour retrouver les propriétés de proche surface du manteau neigeux.
Author: Mario B. Giovinetto
Publisher:
ISBN:
Category : Antarctic regions
Languages : en
Pages : 110
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Author: International Association of Scientific Hydrology
Publisher:
ISBN:
Category : Glaciers
Languages : en
Pages : 184
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Category : Geography
Languages : en
Pages : 1162
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ISBN:
Category :
Languages : en
Pages : 214
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Author: Philip R. Kyle
Publisher: American Geophysical Union
ISBN:
Category : Nature
Languages : en
Pages : 184
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Published by the American Geophysical Union as part of the Antarctic Research Series, Volume 66. In January 1841 Captain James Clark Ross sailed in his two small ships Erebus and Terror into the then unknown southern Ross Sea and discovered and named Mount Erebus. In his journal Ross noted: ...it proved to be a mountain twelve thousand four hundred feet of elevation above the level of the sea, emitting flame and smoke in great profusion; at first the smoke appeared like snow drift, but as we drew nearer, its true character became manifest. On January 28, 1841, Ross reported: At 4 P.M. Mount Erebus was observed to emit smoke and flame in unusual quantities, producing a most grand spectacle. A volume of dense smoke was projected at each successive jet with great force, in a vertical column, to the height of between fifteen hundred and two thousand feet above the mouth of the crater, when condensing first at its upper part, it descended in mist or snow, and gradually dispersed, to be succeeded by another splendid exhibition of the same kind in about half an hour afterwards, although the intervals between eruptions were by no means regular. The diameter of the columns of smoke was between two and three hundred feet, as near as we could measure it; whenever the smoke cleared away, the bright red flame that filled the mouth of the crater was clearly perceptible; and some of the officers believed they could see streams of lava pouring down its sides until lost beneath the snow...
Author: International Association of Hydrological Sciences
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 616
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