A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr

Details A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3721708l&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 21, CiteID L21708

Physics

2

Paleoceanography: Greenhouse Gases

Scientific paper

A high-resolution marine proxy for atmospheric pCO2 is needed to clarify the phase lag between pCO2 and marine climate proxies and to provide a record of orbital-scale pCO2 variations before the oldest ice core measurement at 800 ka. Benthic δ13C data should record deep ocean carbon storage and, thus, atmospheric pCO2. This study finds that a modified δ13C gradient between the deep Pacific and intermediate North Atlantic (Δδ13CP-$\frac{NA{2}) correlates well with pCO2. Δδ13CP-$\frac{NA{2} reproduces characteristic differences between pCO2 and ice volume during Late Pleistocene glaciations and indicates that pCO2 usually leads terminations by 0.2-3.7 kyr but lags by 3-10 kyr during two “failed” terminations at 535 and 745 ka. Δδ13CP-$\frac{NA{2} gradually transitions from 41- to 100-kyr cyclicity from 1.3-0.7 Ma but has no secular trend in mean or amplitude since 1.5 Ma. The minimum pCO2 of the last 1.5 Myr is estimated to be 155 ppm at ˜920 ka.

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