| PALEOLIMNOLOGY |
Orbital- and millennial-scale vegetation and climate changes of the past 225 ka from Bear Lake, Utah¿Idaho (USA).
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Jiménez-Moreno, G.,Anderson, R.S.,Fawcett, P.J. 2007 Orbital- and millennial-scale vegetation and climate changes of the past
225 ka from Bear Lake, Utah¿Idaho (USA). Quaternary Science Reviews Vol. 26, Issues 13-14, pp. 1713-1724, July 2007.
| Data Coverage |
North: 42 * South: 42 |
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West: -111 * East: -111 |
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Altitude: 1805 m |
Start Year: -223000 cal yr BP * End Year: 2000 cal yr BP
Data: Please Cite Data Contributors!
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Summary: Continuous high-resolution pollen data for the past 225 ka from
sediments in Bear Lake, Utah¿Idaho reflect changes in vegetation
and climate that correlate well with variations in summer insolation
and global ice-volume during MIS 1 through 7. Spectral analysis of
the pollen data identified peaks at 21¿22 and 100 ka corresponding
to periodicities in Earth's precession and eccentricity orbital cycles.
Suborbital climatic fluctuations recorded in the pollen data, denoted
by 6 and 5 ka cyclicities, are similar to Greenland atmospheric
temperatures and North Atlantic ice-rafting Heinrich events.
Our results show that millennial-scale climate variability is also
evident during MIS 5, 6 and 7, including the occurrence of Heinrich-
like events in MIS 6, showing the long-term feature of such climate
variability. This study provides clear evidence of a highly
interconnected ocean¿atmosphere system during the last two glacial/
interglacial cycles that extended its influence as far as continental
western North America. Our study also contributes to a greater
understanding of the impact of long-term climate change on vegetation
of western North America. Such high-resolution studies are particularly
important in efforts of the scientific community to predict the
consequences of future climate change.
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