Revised paleoaltimetry data show low Tibetan Plateau elevation during the Eocene
Paleotopographic reconstructions of the Tibetan Plateau based on stable isotope paleoaltimetry methods conclude that most of the Plateau's current elevation was already reached by the Eocene, ~40 million years ago. However, changes in atmospheric and hydrological dynamics affect oxygen stable i...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2019-03, Vol.363 (6430), p.946-946 |
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| creator | Botsyun, Svetlana Sepulchre, Pierre Donnadieu, Yannick Risi, Camille Licht, Alexis Rugenstein, Jeremy K. Caves |
| description | Paleotopographic reconstructions of the Tibetan Plateau based on stable isotope paleoaltimetry methods conclude that most of the Plateau's current elevation was already reached by the Eocene, ~40 million years ago. However, changes in atmospheric and hydrological dynamics affect oxygen stable isotopes in precipitation and may thus bias such reconstructions. We used an isotope-equipped general circulation model to assess the influence of changing Eocene paleogeography and climate on paleoelevation estimates. Our simulations indicate that stable isotope paleoaltimetry methods are not applicable in Eocene Asia because of a combination of increased convective precipitation, mixture of air masses, and widespread aridity. Rather, a model-data comparison suggests that the Tibetan Plateau only reached low to moderate (less than 3000 meters) elevations during the Eocene, reconciling oxygen isotope data with other proxies. |
| doi_str_mv | 10.1126/science.aaq1436 |
| format | Article |
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Caves</creator><creatorcontrib>Botsyun, Svetlana ; Sepulchre, Pierre ; Donnadieu, Yannick ; Risi, Camille ; Licht, Alexis ; Rugenstein, Jeremy K. Caves</creatorcontrib><description>Paleotopographic reconstructions of the Tibetan Plateau based on stable isotope paleoaltimetry methods conclude that most of the Plateau's current elevation was already reached by the Eocene, ~40 million years ago. However, changes in atmospheric and hydrological dynamics affect oxygen stable isotopes in precipitation and may thus bias such reconstructions. We used an isotope-equipped general circulation model to assess the influence of changing Eocene paleogeography and climate on paleoelevation estimates. Our simulations indicate that stable isotope paleoaltimetry methods are not applicable in Eocene Asia because of a combination of increased convective precipitation, mixture of air masses, and widespread aridity. Rather, a model-data comparison suggests that the Tibetan Plateau only reached low to moderate (less than 3000 meters) elevations during the Eocene, reconciling oxygen isotope data with other proxies.</description><identifier>ISSN: 0036-8075</identifier><identifier>EISSN: 1095-9203</identifier><identifier>DOI: 10.1126/science.aaq1436</identifier><identifier>PMID: 30819936</identifier><language>eng</language><publisher>United States: American Association for the Advancement of Science</publisher><subject>Air masses ; Albedo ; Aridity ; Ascent ; Atmospheric circulation ; Atmospheric models ; Boundary conditions ; Carbon dioxide ; Carbonates ; Climate ; Climate change ; Climate models ; Computer simulation ; Convection ; Convective precipitation ; Depletion ; Distillation ; Elevation ; Engineering Sciences ; Eocene ; Evaporation ; General circulation models ; Geology ; Hydrologic cycle ; Hydrologic models ; Hydrology ; Isotopes ; Measuring instruments ; Monsoons ; Neogene ; Oxygen isotopes ; Precipitation ; Rainfall ; Recycling ; RESEARCH ARTICLE SUMMARY ; Sea surface temperature ; Stable isotopes ; Statistical analysis ; Summer ; Topography ; Water reuse</subject><ispartof>Science (American Association for the Advancement of Science), 2019-03, Vol.363 (6430), p.946-946</ispartof><rights>Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. 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Caves</creatorcontrib><title>Revised paleoaltimetry data show low Tibetan Plateau elevation during the Eocene</title><title>Science (American Association for the Advancement of Science)</title><addtitle>Science</addtitle><description>Paleotopographic reconstructions of the Tibetan Plateau based on stable isotope paleoaltimetry methods conclude that most of the Plateau's current elevation was already reached by the Eocene, ~40 million years ago. However, changes in atmospheric and hydrological dynamics affect oxygen stable isotopes in precipitation and may thus bias such reconstructions. We used an isotope-equipped general circulation model to assess the influence of changing Eocene paleogeography and climate on paleoelevation estimates. Our simulations indicate that stable isotope paleoaltimetry methods are not applicable in Eocene Asia because of a combination of increased convective precipitation, mixture of air masses, and widespread aridity. Rather, a model-data comparison suggests that the Tibetan Plateau only reached low to moderate (less than 3000 meters) elevations during the Eocene, reconciling oxygen isotope data with other proxies.</description><subject>Air masses</subject><subject>Albedo</subject><subject>Aridity</subject><subject>Ascent</subject><subject>Atmospheric circulation</subject><subject>Atmospheric models</subject><subject>Boundary conditions</subject><subject>Carbon dioxide</subject><subject>Carbonates</subject><subject>Climate</subject><subject>Climate change</subject><subject>Climate models</subject><subject>Computer simulation</subject><subject>Convection</subject><subject>Convective precipitation</subject><subject>Depletion</subject><subject>Distillation</subject><subject>Elevation</subject><subject>Engineering Sciences</subject><subject>Eocene</subject><subject>Evaporation</subject><subject>General circulation models</subject><subject>Geology</subject><subject>Hydrologic cycle</subject><subject>Hydrologic models</subject><subject>Hydrology</subject><subject>Isotopes</subject><subject>Measuring instruments</subject><subject>Monsoons</subject><subject>Neogene</subject><subject>Oxygen isotopes</subject><subject>Precipitation</subject><subject>Rainfall</subject><subject>Recycling</subject><subject>RESEARCH ARTICLE SUMMARY</subject><subject>Sea surface temperature</subject><subject>Stable isotopes</subject><subject>Statistical analysis</subject><subject>Summer</subject><subject>Topography</subject><subject>Water reuse</subject><issn>0036-8075</issn><issn>1095-9203</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNpd0bFu2zAQBmCiaNG4SedOLQR0aQclPJKixDEI0qaAgQSBd-IknmoatOiIlIO8fdXY9dDhwOE-Hu7wM_YJ-CWA0Fep8zR0dIn4BErqN2wB3FSlEVy-ZQvOpS4bXldn7ENKG87nnpHv2ZnkDRgj9YI9PNLeJ3LFDgNFDNlvKY8vhcOMRVrH5yLMtfItZRyKh4CZcCoo0B6zj0PhptEPv4u8puI2djTQBXvXY0j08fies9WP29XNXbm8__nr5npZYgWQS6MM1JXm1BhVu1722LWV0koRbwwp1xpnRIuN7hVpAaCEA-54y-uuqaGX5-z7Yewag92Nfovji43o7d310naElgtodKXVHmb77WB3Y3yaKGW79amjEHCgOCU7y7qCRqhmpl__o5s4jcN8yKsCAULKWV0dVDfGlEbqTxsAt39zscdc7DGX-ceX49yp3ZI7-X9BzODzAWxSjuOpL7QG0LKWfwC9IpLn</recordid><startdate>20190301</startdate><enddate>20190301</enddate><creator>Botsyun, Svetlana</creator><creator>Sepulchre, Pierre</creator><creator>Donnadieu, Yannick</creator><creator>Risi, Camille</creator><creator>Licht, Alexis</creator><creator>Rugenstein, Jeremy K. 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Caves</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Revised paleoaltimetry data show low Tibetan Plateau elevation during the Eocene</atitle><jtitle>Science (American Association for the Advancement of Science)</jtitle><addtitle>Science</addtitle><date>2019-03-01</date><risdate>2019</risdate><volume>363</volume><issue>6430</issue><spage>946</spage><epage>946</epage><pages>946-946</pages><issn>0036-8075</issn><eissn>1095-9203</eissn><abstract>Paleotopographic reconstructions of the Tibetan Plateau based on stable isotope paleoaltimetry methods conclude that most of the Plateau's current elevation was already reached by the Eocene, ~40 million years ago. However, changes in atmospheric and hydrological dynamics affect oxygen stable isotopes in precipitation and may thus bias such reconstructions. We used an isotope-equipped general circulation model to assess the influence of changing Eocene paleogeography and climate on paleoelevation estimates. 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| subjects | Air masses Albedo Aridity Ascent Atmospheric circulation Atmospheric models Boundary conditions Carbon dioxide Carbonates Climate Climate change Climate models Computer simulation Convection Convective precipitation Depletion Distillation Elevation Engineering Sciences Eocene Evaporation General circulation models Geology Hydrologic cycle Hydrologic models Hydrology Isotopes Measuring instruments Monsoons Neogene Oxygen isotopes Precipitation Rainfall Recycling RESEARCH ARTICLE SUMMARY Sea surface temperature Stable isotopes Statistical analysis Summer Topography Water reuse |
| title | Revised paleoaltimetry data show low Tibetan Plateau elevation during the Eocene |
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