HR: 17:30h
AN: PP44A-07    [Abstracts]
TI: Breakdown of Sr/Ca Paleothermometer in a coral record from New Georgia, West Pacific Warm Pool
AU: * Liu, J
EM: jl58@duke.edu
AF: Dept. of Earth & Ocean Sciences, Duke University,Durham, NC, 27708, Dept. of Earth & Ocean Sciences, Duke University, Durham, NC 27708 United States
AU: Crowley, T J
EM: tcrowley@duke.edu
AF: Dept. of Earth & Ocean Sciences, Duke University,Durham, NC, 27708, Dept. of Earth & Ocean Sciences, Duke University, Durham, NC 27708 United States
AU: Quinn, T M
EM: quinn@seas.marine.usf.edu
AF: College of Marine Sci., University of South Florida, College of Marine Sci., University of South Florida, St. Petersburg, FL 33704 United States
AB: Here we present a tropical sea surface temperature (SST) record derived from Sr/Ca in a coral from Gizo Island, New Georgia. These results from the last century show a decoupling of the relationship between Sr/Ca and SST, a feature that we suggest may be more wide spread than often acknowledged. At Gizo Island, the decoupling of Sr/SST may reflect changes in the balance of subtropical and equatorial water masses at the site due to shifts of South Pacific Convergence Zone (SPCZ). As other sites, the explanation is not as clear. To better understand this breakdown, we generated correlation maps between pacific tropical coral geochemical proxies and SST in the Pacific Basin over the last century. Most of the seasonal geochemical data are dominated by the hemispheric changes in the seasonal cycle of irradiation. ENSO and PDO patterns only emerge in annual averaged reconstruction. We also find remote correlations sometimes exceeding those at the site of the coral. These results suggest some type of frequency dependent geochemical response to changing temperature.
DE: 0473 Paleoclimatology and paleoceanography (3344, 4900)
DE: 3344 Paleoclimatology (0473, 4900)
DE: 4900 PALEOCEANOGRAPHY (0473, 3344)
DE: 4916 Corals (4220)
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005