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Terrestrial cooling and changes in hydroclimate in the continental interior of the United States across the Eocene-Oligocene boundary

2017; Geological Society of America; Volume: 130; Issue: 7-8 Linguagem: Inglês

10.1130/b31732.1

1943-2674

Majie Fan, Sara Ayyash, Aradhna Tripati, Benjamin H. Passey, Elizabeth M. Griffith,

Isotope Analysis in Ecology

Research Article| December 27, 2017 Terrestrial cooling and changes in hydroclimate in the continental interior of the United States across the Eocene-Oligocene boundary Majie Fan; Majie Fan † 1Department of Earth and Environmental Sciences, The University of Texas at Arlington, 500 Yates Street, Arlington, Texas 76019, USA †mfan@uta.edu Search for other works by this author on: GSW Google Scholar Sara A. Ayyash; Sara A. Ayyash 1Department of Earth and Environmental Sciences, The University of Texas at Arlington, 500 Yates Street, Arlington, Texas 76019, USA Search for other works by this author on: GSW Google Scholar Aradhna Tripati; Aradhna Tripati 2Department of Earth, Planetary, and Space Sciences, University of California–Los Angeles, and Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, 595 Charles E Young Drive E, Los Angeles, California 90095, USA3European Institute of Marine Sciences (IUEM), Université de Bretagne Occidentale, UMR 6538/6539, Rue Dumont D'Urville, and L'Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Plouzané 29280, France Search for other works by this author on: GSW Google Scholar Benjamin H. Passey; Benjamin H. Passey 4Morton K. Blaustein Department of Earth and Planetary Sciences, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21218, USA Search for other works by this author on: GSW Google Scholar Elizabeth M. Griffith Elizabeth M. Griffith 5School of Earth Sciences, The Ohio State University, 275 Mendenhall Laboratory, 125 South Oval Mall, Columbus, Ohio 43210, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Majie Fan † 1Department of Earth and Environmental Sciences, The University of Texas at Arlington, 500 Yates Street, Arlington, Texas 76019, USA Sara A. Ayyash 1Department of Earth and Environmental Sciences, The University of Texas at Arlington, 500 Yates Street, Arlington, Texas 76019, USA Aradhna Tripati 2Department of Earth, Planetary, and Space Sciences, University of California–Los Angeles, and Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, 595 Charles E Young Drive E, Los Angeles, California 90095, USA3European Institute of Marine Sciences (IUEM), Université de Bretagne Occidentale, UMR 6538/6539, Rue Dumont D'Urville, and L'Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Plouzané 29280, France Benjamin H. Passey 4Morton K. Blaustein Department of Earth and Planetary Sciences, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21218, USA Elizabeth M. Griffith 5School of Earth Sciences, The Ohio State University, 275 Mendenhall Laboratory, 125 South Oval Mall, Columbus, Ohio 43210, USA †mfan@uta.edu Publisher: Geological Society of America Received: 28 Dec 2016 Revision Received: 13 Aug 2017 Accepted: 13 Nov 2017 First Online: 27 Dec 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2018 Geological Society of America GSA Bulletin (2018) 130 (7-8): 1073–1084. https://doi.org/10.1130/B31732.1 Article history Received: 28 Dec 2016 Revision Received: 13 Aug 2017 Accepted: 13 Nov 2017 First Online: 27 Dec 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Majie Fan, Sara A. Ayyash, Aradhna Tripati, Benjamin H. Passey, Elizabeth M. Griffith; Terrestrial cooling and changes in hydroclimate in the continental interior of the United States across the Eocene-Oligocene boundary. GSA Bulletin 2017;; 130 (7-8): 1073–1084. doi: https://doi.org/10.1130/B31732.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract One of the most pronounced climate transitions in Earth's history occurred at the Eocene-Oligocene transition, ∼34.0–33.6 m.y. ago. Marine sedimentary records indicate a dramatic decline in pCO2 coeval with global cooling during the transition. However, terrestrial records are relatively sparse, with conflicting interpretations of hydroclimate in continental interiors. Here, we provide quantitative constraints on the response of the continental hydroclimate in the western United States across the Eocene-Oligocene boundary by studying clumped isotope temperatures [T(Δ47)], δ13C and δ18O values of vadose carbonates, and δ13C values of bulk organic matter (δ13Corg) in eastern Wyoming. Our results show that T(Δ47) dropped from ∼28 °C to ∼21 °C, indicating ∼7 °C cooling in air temperature, which occurred parallel to the decrease in atmospheric pCO2 during the latest Eocene–early Oligocene. We find that aridity and the biome were stable, and ice-volume–corrected precipitation δ18O decreased ∼1.6‰ across the Eocene-Oligocene boundary, attributable to reduced vapor condensation temperatures. These new quantitative data add to the growing body of evidence suggesting a marked terrestrial response in temperature and hydroclimate across the Eocene-Oligocene transition. Our findings indicate a pattern of greenhouse-gas–induced global temperature change in the continental interior of the United States that was roughly 1.5–2× the magnitude of cooling in the global ocean. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.