AustralieFrV1, Main, Exploration, bibRecord, 00DA74

Physical and climatic parameters which influence the air content in polar ice

Identifieur interne : 00DA74 ( Main/Exploration ); précédent : 00DA73; suivant : 00DA75

Physical and climatic parameters which influence the air content in polar ice

Auteurs : Patricia Martinerie [France, États-Unis] ; Dominique Raynaud [France] ; David M. Etheridge [Australie] ; Jean-Marc Barnola [France] ; Danièle Mazaudier [France]

Source :

Earth and Planetary Science Letters [ 0012-821X ] ; 1992.

RBID : ISTEX:59678A73F5FFF8037D4E9C42434DB4B101BBB33B

Descripteurs français

Wicri :
- topic : Antarctique, Zone franche, Groenland.

English descriptors

Abstract

Abstract: Under present-day climatic conditions, the air content of polar ice (V) generally shows a high sensitivity to the atmospheric pressure and hence to the surface elevation of the ice sheet wherethe ice is formed. The results presented here are from sixteen different sites (fourteen in Antartica, one in Greenland and one in the Yukon Territories, Canada), and they allow a better understanding of the parameters which influence the air content in ice. It is demonstrated the V can be expressed very simply as a function of the atmospheric pressure (Pi), the temperature (Ti) and the porous volume of ice (Vi) at which the air in the firn becomes isolated in terms of pressure from the atmosphere during the process of pore close-off. Our results confirm a Vi increase with temperature and show no clear Vi dependence on snow accumulation rate. The possible non-linearity of the Vi − Ti relation we obtain could be due to a wind influence on Vi and/or to a second-order effect of the accumulation rate. Our Vi results are compared to measurements of the volume of closed pores versus depth in the firn. To close, we discuss the parameterization that we can obtain to interpret the air content variations observed in deep ice cores (over periods covering glacial-interglacial transitions) in terms of paleoclimatic conditions prevailing at the surface of the ice sheet.

Url:

https://api.istex.fr/document/59678A73F5FFF8037D4E9C42434DB4B101BBB33B/fulltext/pdf

DOI: 10.1016/0012-821X(92)90002-D

Affiliations:

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Le document en format XML

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<author><name sortKey="Raynaud, Dominique" sort="Raynaud, Dominique" uniqKey="Raynaud D" first="Dominique" last="Raynaud">Dominique Raynaud</name>
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<author><name sortKey="Etheridge, David M" sort="Etheridge, David M" uniqKey="Etheridge D" first="David M." last="Etheridge">David M. Etheridge</name>
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<author><name sortKey="Barnola, Jean Marc" sort="Barnola, Jean Marc" uniqKey="Barnola J" first="Jean-Marc" last="Barnola">Jean-Marc Barnola</name>
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<author><name sortKey="Mazaudier, Daniele" sort="Mazaudier, Daniele" uniqKey="Mazaudier D" first="Danièle" last="Mazaudier">Danièle Mazaudier</name>
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<author><name sortKey="Etheridge, David M" sort="Etheridge, David M" uniqKey="Etheridge D" first="David M." last="Etheridge">David M. Etheridge</name>
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<author><name sortKey="Barnola, Jean Marc" sort="Barnola, Jean Marc" uniqKey="Barnola J" first="Jean-Marc" last="Barnola">Jean-Marc Barnola</name>
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<author><name sortKey="Mazaudier, Daniele" sort="Mazaudier, Daniele" uniqKey="Mazaudier D" first="Danièle" last="Mazaudier">Danièle Mazaudier</name>
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<wicri:regionArea>2Present address: Laboratoire de Microbiologie Marine, Campus de Luminy, Case 907, 70 rue Léon Lachamp, 13288 Marseille Cedex 9</wicri:regionArea>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Accumulation rate</term>
<term>Antarctic</term>
<term>Antarctic sites</term>
<term>Antarctica</term>
<term>Atmospheric pressure</term>
<term>Better understanding</term>
<term>Bubble compression</term>
<term>Bubble level</term>
<term>Camp century</term>
<term>Certain depth</term>
<term>Climatic</term>
<term>Climatic conditions</term>
<term>Coastal antarctic sites</term>
<term>Coldest sites</term>
<term>Content results</term>
<term>Correlation coefficient</term>
<term>Dense layer</term>
<term>Different sites</term>
<term>Drill site</term>
<term>Elevation</term>
<term>Elsevier science publishers</term>
<term>Firn</term>
<term>Firn sample</term>
<term>Free zone</term>
<term>Full range</term>
<term>Geographic variations</term>
<term>Glaciol</term>
<term>Greenland</term>
<term>High correlation coefficient</term>
<term>Higher density layers</term>
<term>Individual pores</term>
<term>Isolation level</term>
<term>Isolation site</term>
<term>Isotopic composition</term>
<term>Linear regression</term>
<term>Logan</term>
<term>Maximum density layers</term>
<term>Maximum error</term>
<term>Mbar</term>
<term>Next step</term>
<term>Other sites</term>
<term>Pore</term>
<term>Pore volume</term>
<term>Pore volume measurements</term>
<term>Pore volumes</term>
<term>Present address</term>
<term>Pressure increase</term>
<term>Raynaud</term>
<term>Rough estimate</term>
<term>Saint martin cedex</term>
<term>Sealing effect</term>
<term>Seasonal variations</term>
<term>Second term</term>
<term>Sheet surface</term>
<term>Significant difference</term>
<term>Snow accumulation</term>
<term>Snow accumulation rate</term>
<term>Summer accumulation</term>
<term>Summer layers</term>
<term>Summer snow</term>
<term>Surface elevation</term>
<term>Temperature change</term>
<term>Vostok</term>
<term>Wind influence</term>
<term>Wind speed</term>
<term>Winter layers</term>
<term>Yukon territories</term>
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<keywords scheme="Teeft" xml:lang="en"><term>Accumulation rate</term>
<term>Antarctic</term>
<term>Antarctic sites</term>
<term>Antarctica</term>
<term>Atmospheric pressure</term>
<term>Better understanding</term>
<term>Bubble compression</term>
<term>Bubble level</term>
<term>Camp century</term>
<term>Certain depth</term>
<term>Climatic</term>
<term>Climatic conditions</term>
<term>Coastal antarctic sites</term>
<term>Coldest sites</term>
<term>Content results</term>
<term>Correlation coefficient</term>
<term>Dense layer</term>
<term>Different sites</term>
<term>Drill site</term>
<term>Elevation</term>
<term>Elsevier science publishers</term>
<term>Firn</term>
<term>Firn sample</term>
<term>Free zone</term>
<term>Full range</term>
<term>Geographic variations</term>
<term>Glaciol</term>
<term>Greenland</term>
<term>High correlation coefficient</term>
<term>Higher density layers</term>
<term>Individual pores</term>
<term>Isolation level</term>
<term>Isolation site</term>
<term>Isotopic composition</term>
<term>Linear regression</term>
<term>Logan</term>
<term>Maximum density layers</term>
<term>Maximum error</term>
<term>Mbar</term>
<term>Next step</term>
<term>Other sites</term>
<term>Pore</term>
<term>Pore volume</term>
<term>Pore volume measurements</term>
<term>Pore volumes</term>
<term>Present address</term>
<term>Pressure increase</term>
<term>Raynaud</term>
<term>Rough estimate</term>
<term>Saint martin cedex</term>
<term>Sealing effect</term>
<term>Seasonal variations</term>
<term>Second term</term>
<term>Sheet surface</term>
<term>Significant difference</term>
<term>Snow accumulation</term>
<term>Snow accumulation rate</term>
<term>Summer accumulation</term>
<term>Summer layers</term>
<term>Summer snow</term>
<term>Surface elevation</term>
<term>Temperature change</term>
<term>Vostok</term>
<term>Wind influence</term>
<term>Wind speed</term>
<term>Winter layers</term>
<term>Yukon territories</term>
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<term>Zone franche</term>
<term>Groenland</term>
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<front><div type="abstract" xml:lang="en">Abstract: Under present-day climatic conditions, the air content of polar ice (V) generally shows a high sensitivity to the atmospheric pressure and hence to the surface elevation of the ice sheet wherethe ice is formed. The results presented here are from sixteen different sites (fourteen in Antartica, one in Greenland and one in the Yukon Territories, Canada), and they allow a better understanding of the parameters which influence the air content in ice. It is demonstrated the V can be expressed very simply as a function of the atmospheric pressure (Pi), the temperature (Ti) and the porous volume of ice (Vi) at which the air in the firn becomes isolated in terms of pressure from the atmosphere during the process of pore close-off. Our results confirm a Vi increase with temperature and show no clear Vi dependence on snow accumulation rate. The possible non-linearity of the Vi − Ti relation we obtain could be due to a wind influence on Vi and/or to a second-order effect of the accumulation rate. Our Vi results are compared to measurements of the volume of closed pores versus depth in the firn. To close, we discuss the parameterization that we can obtain to interpret the air content variations observed in deep ice cores (over periods covering glacial-interglacial transitions) in terms of paleoclimatic conditions prevailing at the surface of the ice sheet.</div>
</front>
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<name sortKey="Raynaud, Dominique" sort="Raynaud, Dominique" uniqKey="Raynaud D" first="Dominique" last="Raynaud">Dominique Raynaud</name>
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<country name="États-Unis"><region name="Colorado"><name sortKey="Martinerie, Patricia" sort="Martinerie, Patricia" uniqKey="Martinerie P" first="Patricia" last="Martinerie">Patricia Martinerie</name>
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<country name="Australie"><noRegion><name sortKey="Etheridge, David M" sort="Etheridge, David M" uniqKey="Etheridge D" first="David M." last="Etheridge">David M. Etheridge</name>
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Physical and climatic parameters which influence the air content in polar ice

Physical and climatic parameters which influence the air content in polar ice

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri