HR: 08:30h
AN: PP51E-03    [Abstracts]
TI: Climate variability in a Pliocene boreal forest: evidence from tree-rings of sub-fossil wood.
AU: * Csank, A Z
EM: csank@ltrr.arizona.edu
AF: Laboratory of Tree-Ring Research, University of Arizona 105A W Stadium, Tucson, AZ 85721, United States
AU: Patterson, W P
EM: bill.patterson@usask.ca
AF: Saskatchewan Isotope Laboratory, University of Saskatchewan 114 Science Pl, Saskatoon, SK S7N 5E2, Canada
AU: Eglington, B
EM: bruce.eglington@usask.ca
AF: Saskatchewan Isotope Laboratory, University of Saskatchewan 114 Science Pl, Saskatoon, SK S7N 5E2, Canada
AU: Basinger, J F
EM: jim.basinger@usask.ca
AF: Department of Geological Sciences, University of Saskatchewan 114 Science Pl, Saskatoon, SK S7N 5E2, Canada
AU: Rybczynski, N
EM: NRybczynski@mus-nature.ca
AF: Canadian Museum of Nature, PO Box 3443 Station D, Ottawa, ON K1P 6P4, Canada
AB: In recent decades, the response of high latitudes to changes in climate has led to renewed interest in the study of ancient ecosystems under greenhouse conditions. Making the study of past Arctic climates particularly informative when considering the response of high latitudes to future warming. Tree rings have enormous potential to provide both climatic and ecological in the modern climatic system models there exist several well known oceanic cycles, such as, ENSO, PDO AO/NAO and the AMO that have been observed to exert a strong influence on regional and global climate. Recently Global Circulation Models (GCM) have begun to incorporate these climate cycles in an effort to study their effects on past and future climate. Huber and Caballero, (2003) demonstrated evidence for ENSO during the Eocene and Wara et al. (2005) and Fedorov et al., (2006) have demonstrated that these familiar cycles were in operation during the Pliocene. However, empirical evidence for climatic oscillations operating during these times remains sparse. Tree rings have enormous potential to provide both climatic and ecological information at an annual resolution. Our inter-annual study of Pliocene sub-fossil wood provides direct observations to demonstrate whether these inter-annual and inter-decadal climatic oscillations were indeed persistent through the Pliocene.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1637 Regional climate change
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting