Evolution of the glacial landscape of the Southern Alps of New Zealand : Insights from a glacial erosion model
Identifieur interne : 003252 ( PascalFrancis/Checkpoint ); précédent : 003251; suivant : 003253Evolution of the glacial landscape of the Southern Alps of New Zealand : Insights from a glacial erosion model
Auteurs : Frédéric Herman [Australie, États-Unis, Suisse] ; Jean Braun [France]Source :
- Journal of geophysical research [ 0148-0227 ] ; 2008.
Descripteurs français
- Pascal (Inist)
- Paysage, Erosion glaciaire, Modèle tectonique, Calotte glaciaire, Modélisation, Aluminium, Complexité, Glacier, Massif montagneux, Surrection, Précipitation atmosphérique, Oscillation, Rétroaction, Boucle réaction, Forme relief, Dynamique, Phénomène transitoire, Cycle, Alpes, Nouvelle Zélande, Faille Alpine.
- Wicri :
- topic : Aluminium.
English descriptors
- KwdEn :
Abstract
[1] A new version of a landscape evolution model that includes the evolution of an ice cap at a 103 to 105 year timescale and its associated erosion patterns is presented and applied to the Southern Alps of New Zealand. Modeling of the ice cap evolution is performed on a higher-resolution grid (i.e., ∼100 m) than previously (Braun et al., 1998). It predicts which parts of the landscape are, and have been, affected by glacial erosion. The model results highlight the complexity of the erosion patterns induced by ice caps and glaciers. Glacial erosion in a tectonically active area is, as suggested by the model, not uniform across the mountain range. Furthermore, high rock uplift rates, heavy precipitation, and climatic oscillations constantly interact. The feedback mechanisms are such that they render the landform very dynamic and transient. However, under conditions of reduced rock uplift rate and precipitation, the landform becomes more stable at the timescale of the glacial cycle. Finally, the modeling results favor a tectonic model in the Southern Alps in which the maximum rock uplift is offset from the Alpine Fault.
Affiliations:
- Australie, France, Suisse, États-Unis
- Californie, Canton de Zurich, Région Bretagne
- Rennes, Zurich
- Université de Rennes 1, École polytechnique fédérale de Zurich
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Pascal:08-0395030Le document en format XML
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Université de Rennes 1</s1><s2>Rennes</s2><s3>FRA</s3><sZ>2 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Région Bretagne</region><region type="old region">Région Bretagne</region><settlement type="city">Rennes</settlement><settlement type="city">Rennes</settlement></placeName><orgName type="university">Université de Rennes 1</orgName></affiliation></author></analytic><series><title level="j" type="main">Journal of geophysical research</title><title level="j" type="abbreviated">J. geophys. res.</title><idno type="ISSN">0148-0227</idno><imprint><date when="2008">2008</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of geophysical research</title><title level="j" type="abbreviated">J. geophys. res.</title><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alpine Fault</term><term>Alps</term><term>Complexity</term><term>Feedback</term><term>Modeling</term><term>New Zealand</term><term>aluminum</term><term>atmospheric precipitation</term><term>cycles</term><term>dynamics</term><term>feedback</term><term>glacial erosion</term><term>glaciers</term><term>ice caps</term><term>landforms</term><term>landscapes</term><term>mountains</term><term>oscillations</term><term>tectonic models</term><term>transient phenomena</term><term>uplifts</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Paysage</term><term>Erosion glaciaire</term><term>Modèle tectonique</term><term>Calotte glaciaire</term><term>Modélisation</term><term>Aluminium</term><term>Complexité</term><term>Glacier</term><term>Massif montagneux</term><term>Surrection</term><term>Précipitation atmosphérique</term><term>Oscillation</term><term>Rétroaction</term><term>Boucle réaction</term><term>Forme relief</term><term>Dynamique</term><term>Phénomène 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Modeling of the ice cap evolution is performed on a higher-resolution grid (i.e., ∼100 m) than previously (Braun et al., 1998). It predicts which parts of the landscape are, and have been, affected by glacial erosion. The model results highlight the complexity of the erosion patterns induced by ice caps and glaciers. Glacial erosion in a tectonically active area is, as suggested by the model, not uniform across the mountain range. Furthermore, high rock uplift rates, heavy precipitation, and climatic oscillations constantly interact. The feedback mechanisms are such that they render the landform very dynamic and transient. However, under conditions of reduced rock uplift rate and precipitation, the landform becomes more stable at the timescale of the glacial cycle. 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i1="01"><s1>OTO</s1></fN44><fN82><s1>OTO</s1></fN82></pA></standard></inist><affiliations><list><country><li>Australie</li><li>France</li><li>Suisse</li><li>États-Unis</li></country><region><li>Californie</li><li>Canton de Zurich</li><li>Région Bretagne</li></region><settlement><li>Rennes</li><li>Zurich</li></settlement><orgName><li>Université de Rennes 1</li><li>École polytechnique fédérale de Zurich</li></orgName></list><tree><country name="Australie"><noRegion><name sortKey="Herman, Frederic" sort="Herman, Frederic" uniqKey="Herman F" first="Frédéric" last="Herman">Frédéric Herman</name></noRegion></country><country name="États-Unis"><region name="Californie"><name sortKey="Herman, Frederic" sort="Herman, Frederic" uniqKey="Herman F" first="Frédéric" last="Herman">Frédéric Herman</name></region></country><country name="Suisse"><region name="Canton de Zurich"><name sortKey="Herman, Frederic" sort="Herman, Frederic" uniqKey="Herman F" first="Frédéric" last="Herman">Frédéric Herman</name></region></country><country name="France"><region name="Région Bretagne"><name sortKey="Braun, Jean" sort="Braun, Jean" uniqKey="Braun J" first="Jean" last="Braun">Jean Braun</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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