HR: 11:35h
AN: PP41D-06    [PDF]
TI: Holocene North Atlantic Deepwater Carbon Isotope Variability
AU: * Oppo, D W
EM: doppo@whoi.edu
AF: Woods Hole Oceanographic Inst., 360 Woods Hole Rd MS 23, Woods Hole, MA 02543 United States
AU: McManus, J F
EM: jmcmanus@whoi.edu
AF: Woods Hole Oceanographic Inst., 360 Woods Hole Rd MS 23, Woods Hole, MA 02543 United States
AU: Cullen, J L
EM: james.cullen@salemstate.edu
AF: Salem State College, Dept. of Geological Sci., Salem, MA 01970 United States
AB: Using data generated on Ocean Drilling Project site 980 (~2200 m water depth) from the northeastern subpolar North Atlantic, we recently demonstrated that deepwater carbon isotope values in this region varied on millennial time scales in the Holocene (Oppo et al., 2003). We attributed low d13C values at ~ 9300, 8000, 5000, and 2800 years ago to episodic reductions in North Atlantic Deep Water production. A preliminary benthic d13C record from a relatively shallow core (~1300 m) on the eastern flank of the Reykjanes Ridge displays similar variability. Because this core is located in the path of Iceland Scotland Overflow Water, these new data raise the possibility that changes in source water d13C, rather than North Atlantic Deep Water production, drove the d13C variations. We will use published and unpublished data to assess these alternative mechanisms of deepwater d13C variability.
DE: 4267 Paleoceanography
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2003 Fall Meeting