Millennial-scale climate variability in northwest Patagonia over the last 15 000 yr
Version of Record online: 21 JAN 2004
Copyright © 2004 John Wiley & Sons, Ltd.
Journal of Quaternary Science
Volume 19, Issue 1, pages 35–47, January 2004
How to Cite
Moreno, P. I. (2004), Millennial-scale climate variability in northwest Patagonia over the last 15 000 yr. J. Quaternary Sci., 19: 35–47. doi: 10.1002/jqs.813
- Issue online: 21 JAN 2004
- Version of Record online: 21 JAN 2004
- Manuscript Accepted: 12 OCT 2003
- Manuscript Revised: 5 OCT 2003
- Manuscript Received: 8 OCT 2002
- millennial-scale climate variability;
- temperate rainforests;
A pollen record from Lago Condorito (41°45'S, 73°07'W) shows prominent vegetation and climate changes at millennial time-scales, superimposed on multimillennial trends in temperature and westerly activity in northwest Patagonia during the past 15 000 yr. The record shows that evergreen temperate rainforests have dominated the landscape over this interval, with floristic changes ranging from cold-resistant North Patagonian forests with podocarp conifers to Valdivian forests with thermophilous, summer-drought resistant species. The long-term trend shows that cool-temperate and humid conditions prevailed between 15 000 and 11 000 cal. yr BP, followed by an extreme warm and dry phase between 11 000 and 7600 cal. yr BP, and subsequent cooling events and increase in precipitation that peaked at ca. 5000 cal. yr BP, when Southern Hemisphere alpine glaciers achieved their first Neoglacial maximum. Modern conditions were established at ca. 1800 cal. yr BP, following a warm and dry phase between ca. 2900 and 1800 cal. yr BP. These results suggest that millennial-scale climate variability during deglacial and post-glacial times also affected the mid-latitude region of the South Pacific, supporting the idea that changes in the tropical Pacific might be a key factor in the initiation and/or propagation of millennial-scale climate variability at regional, hemispheric and global scales. Copyright © 2004 John Wiley & Sons, Ltd.