Malin Lunde

MSc, Biogeochemistry

UiB

Shelf regions play a critical role in marine carbon (re)cycling, influencing both the distribution of carbon in the water column and its sequestration into marine sediments. Arctic shelf regions contain a disproportionately large area of the global shelf areas yet little is known about carbon recycling in these areas. Unique, pore water isotope analyses during the Nansen Legacy paleo cruise suggest higher carbon turnover in Arctic sediments than are generally observed in other settings suggesting these regions may play a unique role in the global carbon cycle. It is hypothesized that carbon turnover in Arctic sediments is much higher than in typical settings due to high input of electron acceptors (Fe, Mn) related to glacial weathering in the region. More broadly, the hypothesis is that glaciated shelf regions could increase carbon turnover rates and act as a global thermostat via a negative feedback on the carbon cycle as the planet cools/glaciates. Malin analyzes additional pore water (control sites) in a range of (sub)polar settings to test this hypothesis and identify the specific controls on carbon turnover. Her goal is to confirm the initial results of high carbon turnover and test where this occurs. Supervisors: Ulysses S. Ninnemann (UiB), Pål Mørkved (UiB), Allyson Tessin (Kent State University)

RF1 – Physical drivers