HR: 0800h
AN: GC51A-0158    [Abstracts]
TI: Bomb Radiocarbon and the Suess Effect in Palmyra Corals During the Past 100 Years
AU: * Druffel-Rodriguez, K C
EM: kevindr03@yahoo.com
AF: Earth System Science, University of California Irvine, Irvine, CA 92697-3100, United States
AU: Druffel, E R
EM: edruffel@uci.edu
AF: Earth System Science, University of California Irvine, Irvine, CA 92697-3100, United States
AU: Griffin, S
EM: sgriffin@uci.edu
AF: Earth System Science, University of California Irvine, Irvine, CA 92697-3100, United States
AU: Dunbar, R B
EM: dunbar@stanford.edu
AF: Department of Geological and Environmental Sciences, Stanford University, Palo Alto, CA 94305, United States
AU: Sanchez Cabeza, J
EM: J.A.Sanchez@iaea.org
AF: International Atomic Energy Agency, Monaco Environmental Laboratory, Monaco, 33701, Monaco
AU: Zaunbrecher, L
EM: lkzaunbrecher@hotmail.com
AF: School of Earth and Atmospheric Sciences, School of Earth and Atmospheric Sciences, Atlanta, GA 30332, United States
AU: Cobb, K M
EM: kcobb@eas.gatech.edu
AF: School of Earth and Atmospheric Sciences, School of Earth and Atmospheric Sciences, Atlanta, GA 30332, United States
AB: Annual samples from Palmyra coral cores that lived from 1900 to 2007 were analyzed for radiocarbon (D14C) using accelerator mass spectrometry. Palmyra atoll (6N, 162W) is located near the boundary of the North Equatorial Counter Current and the South Equatorial Current in the Pacific Ocean, making it an interesting location for observing changes in Pacific climate, e.g. ENSO. These results show the input of bomb radiocarbon to the tropical Pacific beginning in the mid-1950s, where D14C values rose from ~ -55 to -60 per mil to ~ +100 per mil by 1980. The Suess effect, which is the decrease in D14C noticed by 1955, will be compared to that observed at other locations in the Pacific and Atlantic Oceans. The usefulness of the D14C record at Palmyra as an indicator of climate will be explored.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 4220 Coral reef systems (4916)
DE: 4860 Radioactivity and radioisotopes
DE: 4902 Anthropogenic effects (1803, 4802)
SC: Global Environmental Change [GC]
MN: 2007 Fall Meeting