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Quaternary Science Reviews 26 (2007) 17131724 Orbital-and millennial-scale vegetation and climate changes of the past

Summary: Quaternary Science Reviews 26 (2007) 1713­1724
Orbital- and millennial-scale vegetation and climate changes of the past
225 ka from Bear Lake, Utah­Idaho (USA)
Gonzalo Jime´ nez-Morenoa,b,c,Ã, R. Scott Andersona
, Peter J. Fawcettb
Center for Environmental Sciences and Education, and Quaternary Sciences Program, Northern Arizona University, Flagstaff, AZ 86011, USA
Department of Earth and Planetary Sciences, Northrop Hall, University of New Mexico, Albuquerque, NM 87131, USA
Departamento de Estratigrafi´a y Paleontologi´a, Universidad de Granada, Fuente Nueva s/n, 18002, Granada, Spain
Received 8 November 2006; received in revised form 4 March 2007; accepted 7 May 2007
Continuous high-resolution pollen data for the past 225 ka from sediments in Bear Lake, Utah­Idaho 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 21­22 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 ocean­atmosphere system during the last two glacial/interglacial


Source: Anderson, R. Scott - Quaternary Sciences Program, Northern Arizona University
Jiménez-Moreno, Gonzalo - Departamento de Estratigrafía y Paleontología, Universidad de Granada


Collections: Environmental Sciences and Ecology; Geosciences