Speleothem evidence for Holocene fluctuations of the prairie-forest ecotone, north-central USA

Rhawn F. Denniston, Luis A. González, Richard G. Baker, Yemane Asmerom, Mark K. Reagan, R. Lawrence Edwards, E. Calvin Alexander

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Carbon and oxygen isotopic trends from seven Midwestern speleothems record significant offsets in the timing of middle-Holocene vegetation change. Interactions of dry Pacific and moist Gulf of Mexico air masses maintained a sharp moisture gradient across Iowa, Minnesota, and Wisconsin such that the arrival of prairie was offset by 2000 years between caves and pollen sites located only 50 km apart. Oxygen isotopes shift concomitantly with carbon in most cases, although these changes are believed to represent increased evaporative enrichment of 18O prior to infiltration during the prairie period.

Original languageEnglish (US)
Pages (from-to)671-676
Number of pages6
JournalHolocene
Volume9
Issue number6
DOIs
StatePublished - 1999

Keywords

  • Carbon isotopes
  • Climatic change
  • Holocene
  • Midwestern USA
  • Oxygen isotopes
  • Prairie-forest ecotone
  • Speleothems
  • Vegetation change

Fingerprint Dive into the research topics of 'Speleothem evidence for Holocene fluctuations of the prairie-forest ecotone, north-central USA'. Together they form a unique fingerprint.

Cite this