L. E. Lisiecki & D. Raynaud
PP41D-1489 Poster Thursday AM
We present a Pacific benthic d13C stack of the last 800 kyr and compare it with atmospheric CO2 concentration [Lüthi et al., 2008], Antarctic temperature [Jouzel et al., 2007], and benthic d18O [Lisiecki & Raymo, 2005]. We find that carbon cycle proxies d13C and CO2 share some features which consistently differ from records of Antarctic temperature and benthic d18O. For example, the carbon cycle proxies reach their most extreme glacial values more than 10 kyr before the glacial maxima of MIS 6, 10 and 16. Analysis of these relationships, observed in both marine and ice core records, may shed light on links between the ocean carbonate system and atmospheric pCO2 as well as their role in 100-kyr glacial cycles. Additionally, similarities between benthic d13C and CO2 suggest that some apparent differences between the EDC3 [Parrenin et al., 2007] and LR04 [Lisiecki & Raymo, 2005] age scales (e.g., the MIS 13/14 and 17/18 transitions) are accurate and not the result of age model error.