Changes in CO2 during Ocean Anoxic Event 1d indicate similarities to other carbon cycle perturbations

Ocean chemistry and atmospheric CO2 sensitivity to carbon perturbations throughout the Cenozoic

[1] We assess the response of atmospheric CO2 ( pCO2) and ocean chemistry to carbon perturbations, placing modern carbon‐cycle sensitivity in the context of the Cenozoic. We use the carbon‐cycle model LOSCAR to study the effect of perturbations over the past 67 Ma. Our results indicate that atmospheric CO2 and surface ocean pH were slightly more sensitive to carbon perturbations during the Mioc...

Mid-Cretaceous carbon cycle perturbations and Oceanic Anoxic Events recorded in southern Tibet

The organic carbon isotope (δ13Corg) curve for ~1.7-km-thick mid-Cretaceous strata of the Chaqiela section in Gamba area, southern Tibet is presented in this study. C-isotopic chemostratigraphic correlation combined with biostratigraphic constraints show that the Chaqiela section spans early Aptian through early Campanian period, and that almost all of the carbon cycle perturbations and Oceanic...

Calcium and calcium isotope changes during carbon cycle perturbations at the end-Permian

Negative carbon and calcium isotope excursions, as well as cli-1 mate shifts, took place during the most severe mass extinction event in Earth's 2 history, the end-Permian (∼252 Ma). Investigating the connection between 3 carbon and calcium cycles during transient carbon cycle perturbation events, 4 such as the end-Permian, may help resolve the intricacies between the cou-5 pled calcium-carbon ...

Calcareous Nannoplankton Response to Late Albian Oceanic Anoxic Event 1d in the western North Atlantic

Ocean acidification: the other CO2 problem.

Rising atmospheric carbon dioxide (CO2), primarily from human fossil fuel combustion, reduces ocean pH and causes wholesale shifts in seawater carbonate chemistry. The process of ocean acidification is well documented in field data, and the rate will accelerate over this century unless future CO2 emissions are curbed dramatically. Acidification alters seawater chemical speciation and biogeochem...