HR: 16:00h
AN: PP34B-01 INVITED    [Abstracts]
TI: Tropical-North Pacific Climate Linkages derived from Tree Rings and Corals
AU: * D'Arrigo, R
EM: rdd@ldeo.columbia.edu
AF: Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, United States
AU: Wilson, R
EM: rob.wilson@ed.ac.uk
AF: Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, United States
AU: Wilson, R
EM: rob.wilson@ed.ac.uk
AF: University of Edinburgh, School of Geosciences West Mains Road, Edinburgh, EH26 8JT, United Kingdom
AB: We use tree-ring analysis to extend the understanding of North Pacific climate variability and the tropical-high latitude climate connection over recent centuries. A tree-ring reconstruction of the December-May North Pacific Index (NPI) – an atmospheric circulation index related to the Aleutian Low pressure cell – spans from 1600-1983 and shows evidence for the three regime shifts seen in the instrumental NPI data (including the noteworthy 1976 transition in Pacific climate) and additional events in prior centuries. A 1300-year tree-ring based record for the Gulf of Alaska (GOA) provides additional extended information on North Pacific multi-decadal temperature variability. These records correlate significantly with both instrumental tropical climate indices and a coral-based reconstruction of an optimal tropical Indo-Pacific climate index, supporting evidence for a tropical-North Pacific climate link extending as far west as the Indian Ocean. The coral-based reconstruction (1781-1993) shows the twentieth century regime shifts evident in the instrumental NPI and tropical Indo-Pacific climate index, as well as additional shifts. Changes in the strength of correlation between the reconstructions over time, and differences in identified shifts in the tropical vs North Pacific series prior to the instrumental period suggest a varying tropical influence on North Pacific climate, with greater influence in the twentieth century.
DE: 1600 GLOBAL CHANGE
DE: 1620 Climate dynamics (0429, 3309)
DE: 3344 Paleoclimatology (0473, 4900)
DE: 4916 Corals (4220)
DE: 4920 Dendrochronology
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting