This data was collected as part of the Great Calcite Belt project, from 60W to 120E and 30S to 60S. during MV1101 onboard R/V Melville, January- February 2011 in the South Atlantic Ocean and RR1202 onboard the R/V Roger Revelle, February-March 2012 in the South Indian Ocean. Samples for biomineralizing phytoplankton community structure were taken from the upper 30 m of the water column. This data consists of coccolithophore and diatom cell abundances.

Cell numbers were reported in [#/ml] and have been calculated to [#/l] by a factor of 1000Diatoms were identified following- Hasle, G. R. and Syvertsen, E. E. (1997) In: C. R. Tomas (ed) Marine Phytoplankton, Chapter 2 - Marine Diatoms, Academic Press, San Diego, 5-385 and- Scott, F. J. and Marchant, J. (2005) Antarctic Marine Protists, Australian Biological Resources Study, Canberra

Supplement to: Smith, Helen Elizabeth Katie; Poulton, Alex J; Garley, Rebecca; Hopkins, Jason; Lubelczyk, Laura C; Drapeau, Dave T; Rauschenberg, Sara; Twining, Ben S; Bates, Nicolas R; Balch, William M (2017): The Influence of Environmental Variability on the Biogeography of Coccolithophores and Diatoms in the Great Calcite Belt. Biogeosciences Discussions, 35 pp