Member Profile

Guillaume Liniger

PhD Student

University of Tasmania


I graduated from La Rochelle University with BSc in Marine Biology (2016) and completed a MSc in Oceanography and Marine Environment in 2018 (Sorbonne University, Paris). I then worked for a year as an engineer at the Climate and Oceanography laboratory of Paris following my master thesis. During that time, I worked on sea ice retrievals using an optical method in Arctic. I began my PhD in May 2019 at the Institute for Marine and Antarctic Studies in Hobart, Tasmania on primary productivity in Antarctic polynyas.

THESIS: Primary Productivity in Antarctic polynyas

The Southern Ocean (SO) accounts for about 25% of oceanic CO2 uptake, but this carbon fixation is restricted by iron availability in the open ocean. Consequently, the most productive areas are mostly found in the marginal ice zone and polynyas. Polynyas are open water areas within the ice zone maintained by strong katabatic winds or warm water upwellings. They represent sites of significant sea ice production with high interannual variability, strong dense water formation and biological activity making them the most productive regions of the Southern Ocean relative to their size. Because of their productivity and variability, this project aims to better quantify and understand how much they contribute to CO2 uptake and how current and future changes in the icescape might affect local and regional global productivity. This project is aligned with RP sub-project 4.3. ‘How do Southern Ocean circulation and biogeochemistry vary and interact?’