A multiproxy record of postglacial climate variability from a shallowing, 12-m deep sub-alpine bog in the southeastern San Juan Mountains of Colorado, USA

Bradley G. Johnson, Gonzalo Jiménez-Moreno, Martha Cary Eppes, John A. Diemer, Jeffery R. Stone

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Pollen assemblages, diatom assemblages, and sedimentology, from Cumbres Bog in the southeastern San Juan Mountains of Colorado, provide a record of climate and environmental change since the end of the last glacial maximum (LGM). Cumbres Bog is unusually deep (basal sediments extend 12 m below the surface) for its altitude (~3050 m a.s.l.) and we extracted 7 m core of continuous sediment below ~5 m of water and peat. The resulting record provides strong evidence of: a period of warming immediately after the LGM (~18-13 cal. kyr BP), a cool interval coinciding with the Younger Dryas (~12.8-11.5 cal. kyr BP), a warm stable period from 10 to 6 cal. kyr BP, and a cooler and highly variable climate interval after 6 cal. kyr BP. More specifically, pollen ratios and fossil diatoms indicate that cold periods generally match with previously identified periods of rapid climate change that occurred at 10.6, 8.7-7.9, 7.0-6.9, 5.4-5.2, 3.3-3.0, 2.3, 2.0 and 1.5 cal. kyr BP. This record also adds resolution to previous regional records and indicates that the periodicity of climate variability changed from 2000-3000 years to 700-1100 years around 6 cal. kyr BP and to <500 years after 3.5 cal. kyr BP. Overall, our record provides important, relatively high-resolution paleoclimatic information for this remote region of the southern Rockies.

Original languageEnglish (US)
Pages (from-to)1028-1038
Number of pages11
JournalHolocene
Volume23
Issue number7
DOIs
StatePublished - Jul 2013

Bibliographical note

Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.

Keywords

  • Cumbres Bog core
  • diatoms
  • El Niño-Southern Oscillation
  • Holocene climate
  • paleoecology
  • San Juan Mountains

Continental Scientific Drilling Facility tags

  • UNCC

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