Isotope evidence of paleo–El Niño–Southern Oscillation cycles in loess-paleosol record in the central United States

Abstract

Research Article| September 01, 2000 Isotope evidence of paleo–El Niño–Southern Oscillation cycles in loess-paleosol record in the central United States Hong Wang; Hong Wang 1Illinois State Geological Survey, 615 Peabody, Champaign, Illinois 61820, USA Search for other works by this author on: GSW Google Scholar Leon R. Follmer; Leon R. Follmer 1Illinois State Geological Survey, 615 Peabody, Champaign, Illinois 61820, USA Search for other works by this author on: GSW Google Scholar Jack Chao-li Liu Jack Chao-li Liu 1Illinois State Geological Survey, 615 Peabody, Champaign, Illinois 61820, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Hong Wang 1Illinois State Geological Survey, 615 Peabody, Champaign, Illinois 61820, USA Leon R. Follmer 1Illinois State Geological Survey, 615 Peabody, Champaign, Illinois 61820, USA Jack Chao-li Liu 1Illinois State Geological Survey, 615 Peabody, Champaign, Illinois 61820, USA Publisher: Geological Society of America Received: 25 Feb 2000 Revision Received: 25 May 2000 Accepted: 26 May 2000 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2000) 28 (9): 771–774. https://doi.org/10.1130/0091-7613(2000)28<771:IEOPNO>2.0.CO;2 Article history Received: 25 Feb 2000 Revision Received: 25 May 2000 Accepted: 26 May 2000 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Hong Wang, Leon R. Follmer, Jack Chao-li Liu; Isotope evidence of paleo–El Niño–Southern Oscillation cycles in loess-paleosol record in the central United States. Geology 2000;; 28 (9): 771–774. doi: https://doi.org/10.1130/0091-7613(2000)28<771:IEOPNO>2.0.CO;2 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 The δ13C of soil carbonate in rhizoconcretions collected from a loess-paleosol sequence in the central United States indicates that growing-season C3/C4 plant ratio oscillated by 35% on a 900 ± 200 yr time scale during the late Wisconsinan glaciation. The pattern appears in phase with advance and retreat of the southern margin of the Laurentide ice sheet, suggesting influence by paleo–El Niño–Southern Oscillation cycles. The δ13C of soil organic matter indicates that the annual average C3/C4 plant ratio oscillated only by 18%, with a periodicity of 450 ± 100 yr, and closely matched the cyclic pattern of loess-paleosol layers. It suggests a periodic enhancement of the penetration of the Gulf of Mexico air over the region during this time. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.