General circulation model simulation of the δ18O content of continental precipitation in the middle Cretaceous: A model-proxy comparison

Research Article| March 01, 2007 General circulation model simulation of the δ18O content of continental precipitation in the middle Cretaceous: A model-proxy comparison Christopher J. Poulsen; Christopher J. Poulsen 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA Search for other works by this author on: GSW Google Scholar David Pollard; David Pollard 2Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA Search for other works by this author on: GSW Google Scholar Timothy S. White Timothy S. White 2Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Christopher J. Poulsen 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA David Pollard 2Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA Timothy S. White 2Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA Publisher: Geological Society of America Received: 08 Sep 2006 Revision Received: 06 Oct 2006 Accepted: 10 Oct 2006 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2007) 35 (3): 199–202. https://doi.org/10.1130/G23343A.1 Article history Received: 08 Sep 2006 Revision Received: 06 Oct 2006 Accepted: 10 Oct 2006 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Christopher J. Poulsen, David Pollard, Timothy S. White; General circulation model simulation of the δ18O content of continental precipitation in the middle Cretaceous: A model-proxy comparison. Geology 2007;; 35 (3): 199–202. doi: https://doi.org/10.1130/G23343A.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 SocietyGeology Search Advanced Search Abstract We use the GENESIS atmospheric general circulation model (GCM) with water isotopic transport and fractionation capabilities to quantify the influence of atmospheric CO2, sea level, and elevation of the Western Cordillera on the δ18O of middle Cretaceous precipitation. The model predicts a systematic increase of nearly 3‰ in the δ18O of North American precipitation due to warming associated with an increase in CO2 from 2 to 12 times pre-industrial levels. In contrast, the specification of lowstand conditions and a high ancestral Western Cordillera reduces the δ18O of North American precipitation locally by as much as 6‰ and 8‰. We compare the simulated δ18O of precipitation with the δ18O of paleosol siderite spherules and find good agreement only when the model includes lowstand conditions and a high ancestral Western Cordillera. Our results imply either that Cretaceous high-latitude paleosol δ18O was influenced by orographic precipitation and the Western Interior Seaway, or that the GCM's hydrological cycle is deficient at high pCO2. Additional paleosol data are needed to resolve this issue. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.