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

Hong Wang, L. R. Follmer, J. Chao-li Liu

Research output: Contribution to journalArticlepeer-review

Abstract

The δ 13 C of soil carbonate in rhizoconcretions collected from a loess-paleosol sequence in the central United States indicates that growing-season C 3 /C 4 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 δ 13 C of soil organic matter indicates that the annual average C 3 /C 4 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.

Original languageEnglish (US)
Pages (from-to)771-774
Number of pages4
JournalGeology
Volume28
Issue number9
DOIs
StatePublished - Jan 1 2000

Keywords

  • Carbon isotope
  • Glacial phase
  • Loess-paleosol
  • Paleo-ENSO cycle

ASJC Scopus subject areas

  • Geology

Fingerprint

Dive into the research topics of 'Isotope evidence of paleo - El Niño - Southern Oscillation cycles in loess-paleosol record in the central United States'. Together they form a unique fingerprint.

Cite this