Changes in Coccolith Calcification in Stable Ocean CO2 Conditions
Berger, C., Meier, K.J.S., Kinkel, H. and Baumann, K.-H. 2014. Changes in calcification of coccoliths under stable atmospheric CO2. Biogeosciences 11: 929-944.
Working with the coccolith family Noelaerhabdaceae - which constitutes the majority of the coccolith assemblage inhabiting the North Atlantic Ocean - Berger et al. analyzed average coccolith weights obtained from three Holocene sediment cores extracted along a north-south North Atlantic transect.
The four researchers documented the occurrence of "weight changes during the Holocene of the same amplitude as previously reported for the CO2 increase of the last glacial to interglacial change, but with opposing trends in different regions." And in this regard, they suggest that "differences in nutrient or productivity settings between the sites are likely influencing the response of Noelaerhabdaceae coccolith weight," or that weight increases could be due to "an abundance shift to heavily calcifying morphotypes, such as the increase of an over-calcified type of E. huxleyi, even during times of decreasing carbonate ion concentration."
In their last words on the subject, Berger et al. write that "the high natural variability of coccolith weight during the Holocene raises the question as to whether future changes in the carbonate system of the oceans will have a positive or negative effect on coccolithophore calcification," which is something that most climate alarmists likely have never even considered.