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Abrupt tropical vegetation response to rapid climate changes.
Konrad A Hughen1, Timothy I Eglinton, Li Xu
1Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. khughen@whoi.edu
Science (New York, N.Y.)
|May 25, 2004
Summary
High- and low-latitude climate shifts during deglaciation were synchronous. Tropical vegetation changes lagged these abrupt climate shifts by decades, indicating delayed responses in South America.
Area of Science:
- Paleoclimatology
- Paleobotany
- Climate Dynamics
Background:
- Understanding abrupt climate shifts requires knowing the timing differences between high- and low-latitude events.
- Vascular plant biomarkers offer insights into past vegetation dynamics.
Purpose of the Study:
- To precisely measure the relative timing of abrupt climate and vegetation changes during the last deglaciation.
- To determine if tropical climate shifts lead or lag high-latitude shifts.
Main Methods:
- Analysis of vascular plant biomarkers from Cariaco basin sediments.
- Comparison of biomarker records with climate proxies from the same sediment core.
- Dating of paleoclimate events during the last deglaciation (15,000 to 10,000 years ago).
Main Results:
- Abrupt climate shifts in tropical and North Atlantic high-latitude regions were synchronous.
- Tropical vegetation changes in South America consistently lagged climate shifts by several decades.
- Biomarker records precisely indicated the relative timing of regional changes.
Conclusions:
- Tropical vegetation responses to abrupt climate shifts are delayed.
- High- and low-latitude climate changes during deglaciation occurred simultaneously.
- This study provides a high-resolution record of climate and vegetation dynamics.
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