Comment on "Calcareous nannoplankton response to surface-water acidification around Oceanic Anoxic Event 1a".

School of Ocean and Earth Sciences, National Oceanography Centre, Southampton, European Way, Southampton, SO14 3ZH, UK.
Science (Impact Factor: 31.48). 04/2011; 332(6026):175; author reply 175. DOI: 10.1126/science.1199459
Source: PubMed

ABSTRACT Erba et al. (Reports, 23 July 2010, p. 428) attributed calcareous nannofossil morphology and assemblage changes across Cretaceous Oceanic Anoxic Event 1a to the effects of surface ocean acidification. We argue that the quality of carbonate preservation in these sequences, the unsupported assumptions of the biotic response to acidity, and the absence of independent proxy estimates for ocean pH or atmospheric pCO(2) render this conclusion questionable.

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