Stergios Zarkogiannis

Stergios Zarkogiannis

Royal Society - Newton International Fellow

I am a marine scientist and I specialize in paleoceanography and marine micropaleontology. I am interested in pelagic calcification and the last years I have been working with planktonic foraminifera. I was intrigued by the fact that the cause behind their shell weight shifts during climatic cycles remains a mystery and so I focused on mechanisms that may drive plankton shell mass variations. From studying sediment cores, I found evidence that changes in foraminifera calcification intensities may be a buoyancy regulating mechanism for optimum habitat maintenance during glacial/interglacial ocean density changes. During my Newton Fellowship in Oxford with Ros Rickaby I aim to test my hypothesis on past extreme abrupt geological events, such as the sapropels, where the hydrological signal is momentarily deconvolved from the influence of seawater’s carbonate chemistry on pelagic calcification.

Zarkogiannis S.D.; Disruption of the Atlantic Meridional Circulation during Deglacial Climates Inferred from Planktonic Foraminiferal Shell Weights. Journal of Marine Science and Engineering. 2021,  9, 519,  doi: 10.3390/jmse9050519


Zarkogiannis, S.D.; Kontakiotis, G.; Gkaniatsa, G.; Kuppili, V.S.C.; Marathe, S.; Wanelik, K.; Lianou, V.; Besiou, E.; Makri, P.; Antonarakou, A. An Improved Cleaning Protocol for Foraminiferal Calcite from Unconsolidated Core Sediments: HyPerCal—A New Practice for Micropaleontological and Paleoclimatic Proxies. Journal of Marine Science and Engineering 2020, 8, 998, doi: 10.3390/jmse8120998


Zarkogiannis, S.D.; Fernandez, V.; Greaves, M.; Mortyn, P.G.; Kontakiotis, G.; Antonarakou, A. X-ray tomographic data of planktonic foraminifera species Globigerina bulloides from the Eastern Tropical Atlantic across Termination II. Gigabyte 2020, 1, doi:10.46471/gigabyte.5.


Zarkogiannis, S.D.; Antonarakou, A.; Tripati, A.; Kontakiotis, G.; Mortyn, P.G.; Drinia, H.; Greaves, M. Influence of surface ocean density on planktonic foraminifera calcification. Scientific Reports 2019, 9, 533, doi: 10.1038/s41598-018-36935-7.