HR: 13:55h
AN: C43D-02    [Abstracts]
TI: The Deuterium Excess record from Siple Dome, Antarctica in the Context of Global Climate
AU: * Schilla, A
EM: schilla@colorado.edu
AF: INSTAAR University of Colorado, 450 UCB, Boulder, CO 80309
AU: White, J W
EM: james.white@colorado.edu
AF: INSTAAR University of Colorado, 450 UCB, Boulder, CO 80309
AU: Steig, E
EM: steig@u.washington.edu
AF: Quaternary Research Center Department of Earth and Space Sciences, 351310 University of Washington , Seattle, WA 98195
AU: Brook, E
EM: brooke@geo.oregonstate.edu
AF: Department of Geosciences, 104 Wilkinson Hall Oregon State University, Corvallis, OR 97331
AB: Comparing the deuterium excess record from the Siple Dome ice core in West Antarctica with other Antarctic deuterium excess records reveals that Antarctica receives moisture from various regions whose signatures of climatic conditions are preserved despite strong circum-Antarctic atmospheric circulation. Deuterium excess is a proxy for conditions in the regions providing the moisture to ice core sites, and is derived from the combination of deuterium and oxygen isotope records. Correcting for moisture source conditions is also fundamental to interpreting temperature from the raw isotopes. Using the Siple Dome deuterium excess record as a proxy for conditions over the subtropical to polar Pacific Ocean provides us with a long, continuous, highly-resolved and well-dated indicator of sea surface conditions. We compare this record with other estimates of sea surface temperature, such as oxygen isotopes in corals and Mg/Ca analyses in foraminifera. The Siple excess record is also compared with more distant climate proxies, such as the GISP2 ice isotope record and the ice core methane record, ultimately providing insight into extra-Antarctic climate, including ENSO and millennial-scale climate change.
DE: 3344 Paleoclimatology
DE: 1863 Snow and ice (1827)
DE: 1040 Isotopic composition/chemistry
DE: 1620 Climate dynamics (3309)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting