Technical Comments

Response to Comment on “Calcareous Nannoplankton Response to Surface-Water Acidification Around Oceanic Anoxic Event 1a”

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Science  08 Apr 2011:
Vol. 332, Issue 6026, pp. 175
DOI: 10.1126/science.1199608

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Gibbs et al. question our reconstruction of surface- and deepwater acidification around Oceanic Anoxic Event 1a. We answer their criticisms to better substantiate our arguments and original conclusions. Contrary to their suggestion, preservation cannot explain the nannofossil changes we documented, which trace perturbations in the photic zone, including a substantial increase in partial pressure of CO2 (pCO2) and an inferred decreased pH as derived from geochemical proxies.

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