Evidence for Obliquity Forcing of Glacial Termination II
Identifieur interne : 008348 ( Main/Exploration ); précédent : 008347; suivant : 008349Evidence for Obliquity Forcing of Glacial Termination II
Auteurs : R. N. Drysdale [Australie] ; J. C. Hellstrom [Australie] ; G. Zanchetta [Italie] ; A. E. Fallick [Royaume-Uni] ; M. F. Sanchez Goni [France] ; I. Couchoud [Australie] ; J. Mcdonald [Australie] ; R. Maas [Australie] ; G. Lohmann [Allemagne] ; I. Isola [Italie]Source :
- Science : (Washington, D.C.) [ 0036-8075 ] ; 2009.
Descripteurs français
- Pascal (Inist)
- Obliquité, Paléoclimat, Changement climatique, Glaciation, Ensoleillement, Hémisphère Nord, Précession, Pléistocène sup, Mécanisme, Spéléothème, Chronologie, Cycle, Péninsule Ibérique, Carotte, Sédiment marin, Isotope stable, O 18-O 16, Foraminifera, Taxon benthique, Paléotempérature, Température surface, Eau surface, Taxon planctonique, Forçage astronomique, Température surface marine.
- Wicri :
- topic : Changement climatique.
English descriptors
- KwdEn :
- Iberian Peninsula, Northern Hemisphere, O-18/O-16, benthonic taxa, chronology, climate change, cycles, drill cores, foraminifera, glaciation, insolation, marine sediments, mechanism, paleoclimate, paleotemperature, planktonic taxa, precession, skewness, speleothems, stable isotopes, surface temperature, surface water, upper Pleistocene.
Abstract
Variations in the intensity of high-latitude Northern Hemisphere summer insolation, driven largely by precession of the equinoxes, are widely thought to control the timing of Late Pleistocene glacial terminations. However, recently it has been suggested that changes in Earth's obliquity may be a more important mechanism. We present a new speleothem-based North Atlantic marine chronology that shows that the penultimate glacial termination (Termination II) commenced 141,000 ± 2500 years before the present, too early to be explained by Northern Hemisphere summer insolation but consistent with changes in Earth's obliquity. Our record reveals that Terminations I and II are separated by three obliquity cycles and that they started at near-identical obliquity phases.
Affiliations:
- Allemagne, Australie, France, Italie, Royaume-Uni
- Toscane, Victoria (État)
- Melbourne, Pise
- Université de Melbourne, Université de Pise
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Le document en format XML
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E." last="Fallick">A. E. Fallick</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Scottish Universities Environmental Research Centre</s1><s2>East Kilbride G75 OGF</s2><s3>GBR</s3><sZ>4 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Scottish Universities Environmental Research Centre</wicri:noRegion></affiliation></author><author><name sortKey="Sanchez Goni, M F" sort="Sanchez Goni, M F" uniqKey="Sanchez Goni M" first="M. F." last="Sanchez Goni">M. F. Sanchez Goni</name><affiliation wicri:level="1"><inist:fA14 i1="07"><s1>EPHE, UMR CNRS 5805 EPOC, Université Bordeaux 1</s1><s2>33405 Talence</s2><s3>FRA</s3><sZ>5 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>33405 Talence</wicri:noRegion><wicri:noRegion>Université Bordeaux 1</wicri:noRegion><wicri:noRegion>33405 Talence</wicri:noRegion></affiliation></author><author><name sortKey="Couchoud, I" sort="Couchoud, I" uniqKey="Couchoud I" first="I." last="Couchoud">I. 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Lohmann</name><affiliation wicri:level="1"><inist:fA14 i1="08"><s1>Alfred Wegener Institute for Polar and Marine Research, Bussestrasse 24</s1><s2>27570 Bremerhaven</s2><s3>DEU</s3><sZ>9 aut.</sZ></inist:fA14><country>Allemagne</country><wicri:noRegion>27570 Bremerhaven</wicri:noRegion><wicri:noRegion>Bussestrasse 24</wicri:noRegion><wicri:noRegion>27570 Bremerhaven</wicri:noRegion></affiliation></author><author><name sortKey="Isola, I" sort="Isola, I" uniqKey="Isola I" first="I." last="Isola">I. Isola</name><affiliation wicri:level="1"><inist:fA14 i1="04"><s1>Istituto Nazionale di Geofisica e Vulcanologia, via della Fagiola</s1><s2>Pisa 56126</s2><s3>ITA</s3><sZ>3 aut.</sZ><sZ>10 aut.</sZ></inist:fA14><country>Italie</country><placeName><settlement type="city">Pise</settlement><region nuts="2">Toscane</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Science : (Washington, D.C.)</title><title level="j" type="abbreviated">Science : (Wash. D.C.)</title><idno type="ISSN">0036-8075</idno><imprint><date when="2009">2009</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Science : (Washington, D.C.)</title><title level="j" type="abbreviated">Science : (Wash. D.C.)</title><idno type="ISSN">0036-8075</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Iberian Peninsula</term><term>Northern Hemisphere</term><term>O-18/O-16</term><term>benthonic taxa</term><term>chronology</term><term>climate change</term><term>cycles</term><term>drill cores</term><term>foraminifera</term><term>glaciation</term><term>insolation</term><term>marine sediments</term><term>mechanism</term><term>paleoclimate</term><term>paleotemperature</term><term>planktonic taxa</term><term>precession</term><term>skewness</term><term>speleothems</term><term>stable isotopes</term><term>surface temperature</term><term>surface water</term><term>upper Pleistocene</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Obliquité</term><term>Paléoclimat</term><term>Changement climatique</term><term>Glaciation</term><term>Ensoleillement</term><term>Hémisphère Nord</term><term>Précession</term><term>Pléistocène sup</term><term>Mécanisme</term><term>Spéléothème</term><term>Chronologie</term><term>Cycle</term><term>Péninsule Ibérique</term><term>Carotte</term><term>Sédiment marin</term><term>Isotope stable</term><term>O 18-O 16</term><term>Foraminifera</term><term>Taxon benthique</term><term>Paléotempérature</term><term>Température surface</term><term>Eau surface</term><term>Taxon planctonique</term><term>Forçage astronomique</term><term>Température surface marine</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Changement climatique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Variations in the intensity of high-latitude Northern Hemisphere summer insolation, driven largely by precession of the equinoxes, are widely thought to control the timing of Late Pleistocene glacial terminations. However, recently it has been suggested that changes in Earth's obliquity may be a more important mechanism. We present a new speleothem-based North Atlantic marine chronology that shows that the penultimate glacial termination (Termination II) commenced 141,000 ± 2500 years before the present, too early to be explained by Northern Hemisphere summer insolation but consistent with changes in Earth's obliquity. Our record reveals that Terminations I and II are separated by three obliquity cycles and that they started at near-identical obliquity phases.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Australie</li><li>France</li><li>Italie</li><li>Royaume-Uni</li></country><region><li>Toscane</li><li>Victoria (État)</li></region><settlement><li>Melbourne</li><li>Pise</li></settlement><orgName><li>Université de Melbourne</li><li>Université de Pise</li></orgName></list><tree><country name="Australie"><noRegion><name sortKey="Drysdale, R N" sort="Drysdale, R N" uniqKey="Drysdale R" first="R. N." last="Drysdale">R. N. Drysdale</name></noRegion><name sortKey="Couchoud, I" sort="Couchoud, I" uniqKey="Couchoud I" first="I." last="Couchoud">I. Couchoud</name><name sortKey="Hellstrom, J C" sort="Hellstrom, J C" uniqKey="Hellstrom J" first="J. C." last="Hellstrom">J. C. Hellstrom</name><name sortKey="Maas, R" sort="Maas, R" uniqKey="Maas R" first="R." last="Maas">R. Maas</name><name sortKey="Mcdonald, J" sort="Mcdonald, J" uniqKey="Mcdonald J" first="J." last="Mcdonald">J. Mcdonald</name></country><country name="Italie"><region name="Toscane"><name sortKey="Zanchetta, G" sort="Zanchetta, G" uniqKey="Zanchetta G" first="G." last="Zanchetta">G. Zanchetta</name></region><name sortKey="Isola, I" sort="Isola, I" uniqKey="Isola I" first="I." last="Isola">I. Isola</name><name sortKey="Zanchetta, G" sort="Zanchetta, G" uniqKey="Zanchetta G" first="G." last="Zanchetta">G. Zanchetta</name><name sortKey="Zanchetta, G" sort="Zanchetta, G" uniqKey="Zanchetta G" first="G." last="Zanchetta">G. Zanchetta</name></country><country name="Royaume-Uni"><noRegion><name sortKey="Fallick, A E" sort="Fallick, A E" uniqKey="Fallick A" first="A. E." last="Fallick">A. E. Fallick</name></noRegion></country><country name="France"><noRegion><name sortKey="Sanchez Goni, M F" sort="Sanchez Goni, M F" uniqKey="Sanchez Goni M" first="M. F." last="Sanchez Goni">M. F. Sanchez Goni</name></noRegion></country><country name="Allemagne"><noRegion><name sortKey="Lohmann, G" sort="Lohmann, G" uniqKey="Lohmann G" first="G." last="Lohmann">G. Lohmann</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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