The carbon isotope ratio (δ13C) of plant material is commonly used to reconstruct the
relative distribution of C3 and C4 plants in ancient ecosystems. However, such estimates …

Deep-ocean carbonate ion concentrations ([CO32–]) and carbon isotopic ratios (δ13C)
place important constraints on past redistributions of carbon in the ocean-land-atmosphere …

The Early Eocene Climatic Optimum (EECO) has been characterized as a prolonged warm
event indicated by increased atmospheric pCO2, temperatures, precipitation, and biological …

A prominent, middle Miocene (17.5–13.5 Ma) carbon isotope excursion ubiquitously
recorded in carbonate sediments has been attributed to enhanced marine productivity and …

Variations in the carbon isotopic compositions of marine carbonate and organic carbon
provide a record of changes in the fraction of organic carbon buried through time and may …

We use new and published data representing a 20 million long record to discuss the
systematics of interpreting planktic foraminiferal B/Ca ratios. B/Ca-based reconstructions of …

A simple analytical framework is developed relating the atmospheric partial pressure of CO2
to the globally‐averaged concentrations of respired carbon () and dissolved carbonate () in …

The carbonate compensation depth (CCD), δ 13 C of marine carbonate, atmospheric pCO 2
and major ion composition of seawater provide constraints on how geological carbon cycle …

The eastern equatorial Pacific (EEP) is a source of atmospheric CO2 during the last
deglaciation, but the associated oceanic dynamics in the broader low‐latitude Pacific is not …

We have stacked planktonic carbon isotope data from three cores in the western equatorial
Pacific in order to generate a new reconstruction of atmospheric carbon dioxide over the …