Joint Seminar: The role of ocean in a changing climate: a carbon cycle feedback framework

Anthropogenic carbon emissions increase the atmospheric CO2 and lead to surface warming. The
ocean mitigates this climate response through the uptake of heat and carbon. At the same time,
surface warming and changes in atmospheric CO2 modify the ocean carbon and heat uptakes
leading to a further effect on the climate response through these feedback mechanisms. Here we
explore this link between the ocean and the climate response in terms of contributions from the
ocean heat and carbon uptakes and the associated feedback mechanisms. Specifically, we invoke
a carbon cycle feedback framework that involves: i) the ocean carbon cycle-atmospheric CO2
feedback that is characterised by the carbon transfer into the ocean interior and by the ocean
acidification which inhibits the ocean’s ability to absorb carbon; and ii) the ocean carbon cycle-
climate feedback that is characterised by warming leading to changes in the solubility of the
atmospheric CO2 in ocean water, in the ocean’s stratification and circulation and in the ocean’s
biological drawdown of carbon. The control of the different processes that govern the ocean carbon
cycle (biology, chemistry, ventilation) on these two ocean carbon cycle feedbacks and ultimately
on the climate response is investigated using an idealised atmosphere-ocean model and a suite of
realistic Earth system models integrated for 1% annual rise in CO2.




13:30 Uhr


Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg


Anna Katavouta, University of Liverpool


Tatiana Ilyina

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