Pliocene reversal of late Neogene aridification
Identifieur interne : 000699 ( Pmc/Checkpoint ); précédent : 000698; suivant : 000700Pliocene reversal of late Neogene aridification
Auteurs : J. M. Kale Sniderman [Australie] ; Jon D. Woodhead [Australie] ; John Hellstrom [Australie] ; Gregory J. Jordan [Australie] ; Russell N. Drysdale [Australie, France] ; Jonathan J. Tyler [Australie] ; Nicholas Porch [Australie]Source :
- Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 2016.
Abstract
The warm climates of the Pliocene epoch are considered our best analog for a future anthropogenic greenhouse world. However, understanding of the nature of Pliocene climate variability and change on land is currently limited by the poor age control of most existing terrestrial climate archives. We present a radiometrically dated history of the evolution of Southern Hemisphere vegetation and hydroclimate from the latest Miocene to the middle Pliocene. These data reveal a sharp increase in precipitation in the Early Pliocene, which drove complete vegetation turnover. The development of warm, wet early Pliocene climates clearly reversed a long-term Southern Hemisphere trend of late Neogene cooling and aridification, highlighting the question of what initiated this sustained, ∼1.5-My-long interval of warmth.
Url:
DOI: 10.1073/pnas.1520188113
PubMed: 26858429
PubMed Central: 4776468
Affiliations:
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Woodhead</name><affiliation wicri:level="1"><nlm:aff id="aff1">School of Earth Sciences,<institution>University of Melbourne</institution>, Parkville, VIC 3010,<country>Australia</country>;</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Hellstrom, John" sort="Hellstrom, John" uniqKey="Hellstrom J" first="John" last="Hellstrom">John Hellstrom</name><affiliation wicri:level="1"><nlm:aff id="aff1">School of Earth Sciences,<institution>University of Melbourne</institution>, Parkville, VIC 3010,<country>Australia</country>;</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Jordan, Gregory J" sort="Jordan, Gregory J" uniqKey="Jordan G" first="Gregory J." last="Jordan">Gregory J. Jordan</name><affiliation wicri:level="1"><nlm:aff id="aff2">School of Biological Sciences,<institution>University of Tasmania</institution>, Private Bag 55, Hobart, TAS 7001,<country>Australia</country>;</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Drysdale, Russell N" sort="Drysdale, Russell N" uniqKey="Drysdale R" first="Russell N." last="Drysdale">Russell N. Drysdale</name><affiliation wicri:level="1"><nlm:aff id="aff3">School of Geography,<institution>University of Melbourne</institution>, Parkville, VIC 3010,<country>Australia</country>;</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation><affiliation wicri:level="1"><nlm:aff id="aff4">Environnements, Dynamiques et Territoires de la Montagne, UMR CNRS,<institution>Université de Savoie-Mont Blanc</institution>, 73376 Le Bourget du Lac,<country>France</country>;</nlm:aff><country xml:lang="fr">France</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Tyler, Jonathan J" sort="Tyler, Jonathan J" uniqKey="Tyler J" first="Jonathan J." last="Tyler">Jonathan J. 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M. Kale" last="Sniderman">J. M. Kale Sniderman</name><affiliation wicri:level="1"><nlm:aff id="aff1">School of Earth Sciences,<institution>University of Melbourne</institution>, Parkville, VIC 3010,<country>Australia</country>;</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Woodhead, Jon D" sort="Woodhead, Jon D" uniqKey="Woodhead J" first="Jon D." last="Woodhead">Jon D. Woodhead</name><affiliation wicri:level="1"><nlm:aff id="aff1">School of Earth Sciences,<institution>University of Melbourne</institution>, Parkville, VIC 3010,<country>Australia</country>;</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Hellstrom, John" sort="Hellstrom, John" uniqKey="Hellstrom J" first="John" last="Hellstrom">John Hellstrom</name><affiliation wicri:level="1"><nlm:aff id="aff1">School of Earth Sciences,<institution>University of Melbourne</institution>, Parkville, VIC 3010,<country>Australia</country>;</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Jordan, Gregory J" sort="Jordan, Gregory J" uniqKey="Jordan G" first="Gregory J." last="Jordan">Gregory J. Jordan</name><affiliation wicri:level="1"><nlm:aff id="aff2">School of Biological Sciences,<institution>University of Tasmania</institution>, Private Bag 55, Hobart, TAS 7001,<country>Australia</country>;</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Drysdale, Russell N" sort="Drysdale, Russell N" uniqKey="Drysdale R" first="Russell N." last="Drysdale">Russell N. Drysdale</name><affiliation wicri:level="1"><nlm:aff id="aff3">School of Geography,<institution>University of Melbourne</institution>, Parkville, VIC 3010,<country>Australia</country>;</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation><affiliation wicri:level="1"><nlm:aff id="aff4">Environnements, Dynamiques et Territoires de la Montagne, UMR CNRS,<institution>Université de Savoie-Mont Blanc</institution>, 73376 Le Bourget du Lac,<country>France</country>;</nlm:aff><country xml:lang="fr">France</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Tyler, Jonathan J" sort="Tyler, Jonathan J" uniqKey="Tyler J" first="Jonathan J." last="Tyler">Jonathan J. Tyler</name><affiliation wicri:level="1"><nlm:aff id="aff5">Department of Earth Sciences,<institution>University of Adelaide</institution>, Adelaide, SA 5001,<country>Australia</country>;</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Porch, Nicholas" sort="Porch, Nicholas" uniqKey="Porch N" first="Nicholas" last="Porch">Nicholas Porch</name><affiliation wicri:level="1"><nlm:aff id="aff6">School of Life and Environmental Sciences,<institution>Deakin University</institution>, Burwood, VIC, 3125,<country>Australia</country></nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></analytic><series><title level="j">Proceedings of the National Academy of Sciences of the United States of America</title><idno type="ISSN">0027-8424</idno><idno type="eISSN">1091-6490</idno><imprint><date when="2016">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><title>Significance</title><p>The warm climates of the Pliocene epoch are considered our best analog for a future anthropogenic greenhouse world. However, understanding of the nature of Pliocene climate variability and change on land is currently limited by the poor age control of most existing terrestrial climate archives. We present a radiometrically dated history of the evolution of Southern Hemisphere vegetation and hydroclimate from the latest Miocene to the middle Pliocene. These data reveal a sharp increase in precipitation in the Early Pliocene, which drove complete vegetation turnover. The development of warm, wet early Pliocene climates clearly reversed a long-term Southern Hemisphere trend of late Neogene cooling and aridification, highlighting the question of what initiated this sustained, ∼1.5-My-long interval of warmth.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Proc Natl Acad Sci U S A</journal-id><journal-id journal-id-type="iso-abbrev">Proc. Natl. Acad. Sci. U.S.A</journal-id><journal-id journal-id-type="hwp">pnas</journal-id><journal-id journal-id-type="pmc">pnas</journal-id><journal-id journal-id-type="publisher-id">PNAS</journal-id><journal-title-group><journal-title>Proceedings of the National Academy of Sciences of the United States of America</journal-title></journal-title-group><issn pub-type="ppub">0027-8424</issn><issn pub-type="epub">1091-6490</issn><publisher><publisher-name>National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">26858429</article-id><article-id pub-id-type="pmc">4776468</article-id><article-id pub-id-type="publisher-id">201520188</article-id><article-id pub-id-type="doi">10.1073/pnas.1520188113</article-id><article-categories><subj-group subj-group-type="heading"><subject>Physical Sciences</subject><subj-group><subject>Earth, Atmospheric, and Planetary Sciences</subject></subj-group></subj-group></article-categories><title-group><article-title>Pliocene reversal of late Neogene aridification</article-title><alt-title alt-title-type="short">Pliocene reversal of late Neogene aridification</alt-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Sniderman</surname><given-names>J. M. Kale</given-names></name><xref ref-type="aff" rid="aff1"><sup>a</sup></xref><xref ref-type="corresp" rid="cor1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Woodhead</surname><given-names>Jon D.</given-names></name><xref ref-type="aff" rid="aff1"><sup>a</sup></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0001-9427-3525</contrib-id><name><surname>Hellstrom</surname><given-names>John</given-names></name><xref ref-type="aff" rid="aff1"><sup>a</sup></xref></contrib><contrib contrib-type="author"><name><surname>Jordan</surname><given-names>Gregory J.</given-names></name><xref ref-type="aff" rid="aff2"><sup>b</sup></xref></contrib><contrib contrib-type="author"><name><surname>Drysdale</surname><given-names>Russell N.</given-names></name><xref ref-type="aff" rid="aff3"><sup>c</sup></xref><xref ref-type="aff" rid="aff4"><sup>d</sup></xref></contrib><contrib contrib-type="author"><name><surname>Tyler</surname><given-names>Jonathan J.</given-names></name><xref ref-type="aff" rid="aff5"><sup>e</sup></xref></contrib><contrib contrib-type="author"><name><surname>Porch</surname><given-names>Nicholas</given-names></name><xref ref-type="aff" rid="aff6"><sup>f</sup></xref></contrib><aff id="aff1"><sup>a</sup>School of Earth Sciences,<institution>University of Melbourne</institution>, Parkville, VIC 3010,<country>Australia</country>;</aff><aff id="aff2"><sup>b</sup>School of Biological Sciences,<institution>University of Tasmania</institution>, Private Bag 55, Hobart, TAS 7001,<country>Australia</country>;</aff><aff id="aff3"><sup>c</sup>School of Geography,<institution>University of Melbourne</institution>, Parkville, VIC 3010,<country>Australia</country>;</aff><aff id="aff4"><sup>d</sup>Environnements, Dynamiques et Territoires de la Montagne, UMR CNRS,<institution>Université de Savoie-Mont Blanc</institution>, 73376 Le Bourget du Lac,<country>France</country>;</aff><aff id="aff5"><sup>e</sup>Department of Earth Sciences,<institution>University of Adelaide</institution>, Adelaide, SA 5001,<country>Australia</country>;</aff><aff id="aff6"><sup>f</sup>School of Life and Environmental Sciences,<institution>Deakin University</institution>, Burwood, VIC, 3125,<country>Australia</country></aff></contrib-group><author-notes><corresp id="cor1"><sup>1</sup>To whom correspondence should be addressed. Email: <email>kale.sniderman@unimelb.edu.au</email>.</corresp><fn fn-type="edited-by"><p>Edited by Edouard Bard, Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement, Aix-en-Provence, France, and accepted by the Editorial Board December 30, 2015 (received for review October 13, 2015)</p></fn><fn fn-type="con"><p>Author contributions: J.M.K.S, J.D.W., J.H., and G.J.J. designed research; J.M.K.S., J.D.W., J.H., G.J.J., and N.P. performed research; J.M.K.S., J.D.W., J.H., G.J.J., J.J.T., and N.P. analyzed data; and J.M.K.S., J.D.W., J.H., G.J.J., R.N.D., and J.J.T. wrote the paper.</p></fn></author-notes><pub-date pub-type="ppub"><day>23</day><month>2</month><year>2016</year></pub-date><pub-date pub-type="epub"><day>8</day><month>2</month><year>2016</year></pub-date><volume>113</volume><issue>8</issue><fpage>1999</fpage><lpage>2004</lpage><permissions></permissions><self-uri xlink:title="pdf" xlink:href="pnas.201520188.pdf"></self-uri><abstract abstract-type="executive-summary"><title>Significance</title><p>The warm climates of the Pliocene epoch are considered our best analog for a future anthropogenic greenhouse world. However, understanding of the nature of Pliocene climate variability and change on land is currently limited by the poor age control of most existing terrestrial climate archives. We present a radiometrically dated history of the evolution of Southern Hemisphere vegetation and hydroclimate from the latest Miocene to the middle Pliocene. These data reveal a sharp increase in precipitation in the Early Pliocene, which drove complete vegetation turnover. The development of warm, wet early Pliocene climates clearly reversed a long-term Southern Hemisphere trend of late Neogene cooling and aridification, highlighting the question of what initiated this sustained, ∼1.5-My-long interval of warmth.</p></abstract><abstract><p>The Pliocene epoch (5.3–2.6 Ma) represents the most recent geological interval in which global temperatures were several degrees warmer than today and is therefore considered our best analog for a future anthropogenic greenhouse world. However, our understanding of Pliocene climates is limited by poor age control on existing terrestrial climate archives, especially in the Southern Hemisphere, and by persistent disagreement between paleo-data and models concerning the magnitude of regional warming and/or wetting that occurred in response to increased greenhouse forcing. To address these problems, here we document the evolution of Southern Hemisphere hydroclimate from the latest Miocene to the middle Pliocene using radiometrically-dated fossil pollen records preserved in speleothems from semiarid southern Australia. These data reveal an abrupt onset of warm and wet climates early within the Pliocene, driving complete biome turnover. Pliocene warmth thus clearly represents a discrete interval which reversed a long-term trend of late Neogene cooling and aridification, rather than being simply the most recent period of greater-than-modern warmth within a continuously cooling trajectory. These findings demonstrate the importance of high-resolution chronologies to accompany paleoclimate data and also highlight the question of what initiated the sustained interval of Pliocene warmth.</p></abstract><kwd-group><kwd>paleoclimate</kwd><kwd>pollen</kwd><kwd>speleothems</kwd><kwd>aridification</kwd><kwd>Neogene</kwd></kwd-group><funding-group><award-group id="gs1"><funding-source id="sp1">Department of Industry, Innovation, Science, Research and Tertiary Education, Australian Government | Australian Research Council (ARC)<named-content content-type="funder-id">501100000923</named-content></funding-source><award-id rid="sp1">DE120102530</award-id><award-id rid="sp1">DP130101829</award-id><award-id rid="sp1">FT130100801</award-id></award-group></funding-group><counts><page-count count="6"></page-count></counts></article-meta></front></pmc><affiliations><list><country><li>Australie</li><li>France</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Sniderman, J M Kale" sort="Sniderman, J M Kale" uniqKey="Sniderman J" first="J. M. Kale" last="Sniderman">J. M. Kale Sniderman</name></noRegion><name sortKey="Drysdale, Russell N" sort="Drysdale, Russell N" uniqKey="Drysdale R" first="Russell N." last="Drysdale">Russell N. Drysdale</name><name sortKey="Hellstrom, John" sort="Hellstrom, John" uniqKey="Hellstrom J" first="John" last="Hellstrom">John Hellstrom</name><name sortKey="Jordan, Gregory J" sort="Jordan, Gregory J" uniqKey="Jordan G" first="Gregory J." last="Jordan">Gregory J. Jordan</name><name sortKey="Porch, Nicholas" sort="Porch, Nicholas" uniqKey="Porch N" first="Nicholas" last="Porch">Nicholas Porch</name><name sortKey="Tyler, Jonathan J" sort="Tyler, Jonathan J" uniqKey="Tyler J" first="Jonathan J." last="Tyler">Jonathan J. Tyler</name><name sortKey="Woodhead, Jon D" sort="Woodhead, Jon D" uniqKey="Woodhead J" first="Jon D." last="Woodhead">Jon D. Woodhead</name></country><country name="France"><noRegion><name sortKey="Drysdale, Russell N" sort="Drysdale, Russell N" uniqKey="Drysdale R" first="Russell N." last="Drysdale">Russell N. Drysdale</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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