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Arctic ice and the ecological rise of the dinosaurs
Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10968, USA..ORCID-id: 0000-0002-5852-6326
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China..ORCID-id: 0000-0002-9307-0627
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China..ORCID-id: 0000-0003-0816-8994
Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10968, USA..ORCID-id: 0000-0001-7310-639X
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2022 (Engelska)Ingår i: Science Advances, E-ISSN 2375-2548, Vol. 8, nr 26, s. 1-9, artikel-id eabo6342Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Abundant lake ice-rafted debris in Late Triassic and earliest Jurassic strata of the Junggar Basin of northwestern China (paleolatitude ~71°N) indicates that freezing winter temperatures typified the forested Arctic, despite apersistence of extremely high levels of atmospheric Pco2 (partial pressure of CO2). Phylogenetic bracket analysis shows that non-avian dinosaurs were primitively insulated, enabling them to access rich deciduous and evergreen Arctic vegetation, even under freezing winter conditions. Transient but intense volcanic winters associated withmassive eruptions and lowered light levels led to the end-Triassic mass extinction (201.6 Ma) on land, decimating all medium- to large-sized nondinosaurian, noninsulated continental reptiles. In contrast, insulated dinosaurs were already well adapted to cold temperatures, and not only survived but also underwent a rapid adaptive radiation and ecological expansion in the Jurassic, taking over regions formerly dominated by large noninsulated reptiles.

Ort, förlag, år, upplaga, sidor
Washington D.C., 2022. Vol. 8, nr 26, s. 1-9, artikel-id eabo6342
Nyckelord [en]
Mesozoic, glaciation, climate, dinosaurs, Triassic-Jurassic extinction
Nationell ämneskategori
Annan geovetenskap och miljövetenskap
Forskningsämne
Den föränderliga jorden
Identifikatorer
URN: urn:nbn:se:nrm:diva-4881DOI: 10.1126/sciadv.abo6342OAI: oai:DiVA.org:nrm-4881DiVA, id: diva2:1714525
Forskningsfinansiär
Vetenskapsrådet, 2019-04061
Anmärkning

This is a contribution to UNESCO-IUGS IGCP project 632 and the CycloAstro Project funded by the Heising-Simons Foundation. This work wassupported by the National Natural Science Foundation of China (41730317), the Chinese Academy of Geological Sciences (DD20190009), the Special Basic Program of Ministry of Science and Technology of China (2015FY310100), the Bureau of Geological Survey of China, and the National Committee of Stratigraphy of China (DD20160120-04). The Lamont Climate Center is acknowledged for support to P.O., C.C., and S.K. The LDEO repository is funded by NSF OCE-1259124 and the OSU NSF OCE-1558679. Additional funding was provided by the Heising-Simons Foundation (award no. 2021-2801), the Swedish Research Council (VR grant2019), and the Knut and Alice Wallenberg (KAW) Foundation

Tillgänglig från: 2022-11-29 Skapad: 2022-11-29Bibliografiskt granskad

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Olsen, PaulSha, JingengFang, YananChang, ClaraWhiteside, Jessica H.Kinney, SeanSues, Hans-DieterKent, DennisSchaller, MorganVajda, Vivi
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