Philippe Pondaven

TL;DR: It is found that a large phytoplankton bloom over the Kerguelen plateau in the Southern Ocean was sustained by the supply of iron and major nutrients to surface waters from iron-rich deep water below, suggesting that changes in iron supply from below may have a more significant effect on atmospheric carbon dioxide concentrations than previously thought.

TL;DR: In this paper, the authors show that the extent to which diatoms contribute to the export of carbon varies by diatom type, with carbon transfer modulated by the Si/C ratio of diatom cells, the thickness of the shells and their life strategies; for instance, the tendency to form aggregates or resting spores.

TL;DR: The reconciliation of surface production rates and sedimentary accumulation rates may enable the use of biogenic opal in the reconstruction of palaeoproductivity when the factors that affect the Si/C ratio are better understood.

TL;DR: The case is now put that a change in its availability accounted for a rise in atmospheric CO2 at the end of the Last Glacial Maximum.

TL;DR: In this paper, an ecosystem model embedded in a one-dimensional physical model is used to study the stoichiometry of carbon and nitrogen cycling at the Bermuda Atlantic Time Series site, which successfully provides a budget for the processes contributing to the drawdown of dissolved inorganic carbon (DIC) that is observed in surface waters in the absence of detectable nitrate throughout much of the summer.