HR: 1330h
AN: PP52A-0948    [PDF]
TI: Preliminary ENSO Reconstructions From Siple Dome, Antarctica
AU: * Schilla, A
EM: schilla@colorado.edu
AF: University of Colorado/INSTAAR, 1560 30th St., Boulder, CO 80302
AU: White, J W
EM: james.white@colorado.edu
AF: University of Colorado/INSTAAR, 1560 30th St., Boulder, CO 80302
AU: Steig, E
EM: steig@ess.washington.edu
AF: University of Washington, Department of Earth and Space Sciences 63 Johnson Hall, Seattle, WA 98195
AB: Deuterium excess records from various Antarctic ice cores demonstrate that different sectors of Antarctica receive their moisture from different sources, and that Siple Dome's moisture source resides in the Pacific Ocean. Comparisons of the Siple Dome ice isotope record with the Southern Oscillation Index (SOI) and with the ice isotopes from Taylor Dome and Byrd suggest that the El Nino-Southern Oscillation (ENSO) is an important control on the Pacific Ocean sector of coastal Antarctic climate. Spectral analysis of Siple Dome ice del18O and deuterium excess from the late Holocene (with approximately 6-month temporal resolution) yields statistically significant peaks in the 3-5 year range, suggestive of modern ENSO variability. Several fossil coral records from the late Holocene tropical Pacific Ocean share peaks in the 3-5 year range, and have been interpreted as recorders of ENSO. This suggests that Siple isotopes may also be recording ENSO variations. Siple Dome, therefore, has the potential to be a long, continuous, and high-resolution proxy record of ENSO for the Holocene, and should help illuminate the range of natural variability associated with ENSO.
DE: 3339 Ocean/atmosphere interactions (0312, 4504)
DE: 3344 Paleoclimatology
DE: 4215 Climate and interannual variability (3309)
DE: 4522 El Ni¤o
DE: 4870 Stable isotopes
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2003 Fall Meeting