What about ocean storage of carbon and heat under net-negative CO2 emissions?

durch Ivy Frenger (Geomar)

Donnerstag 06.02.2025, 10:00 → 11:30 Europe/Berlin

8A-002 - Hörsaal Ostufer / Lecture Hall East (GEOMAR - Standort Ostufer / GEOMAR - East Shore)

_{The ocean plays a critical role in storing anthropogenic carbon dioxide and heat, with
profound implications under potential net-negative CO₂ emission scenarios aimed at
reversing global warming. Using an Earth system model of intermediate complexity, we
explore the mechanisms governing oceanic carbon and heat storage and their subsequent
release at multi centennial time scales under idealized temperature-overshoot scenarios.
Here we focus on carbon, finding that (i) under net-positive CO2 emissions, such as under
contemporary conditions and anthropogenic climate change ocean carbon storage is
enhanced by the biological carbon pump. (ii) Under net-negative CO2 emissions, biological
carbon pump storage remains relatively permanent on multi-centennial timescales. In
contrast, physico-chemically stored carbon outgasses rather quickly, leading to biological
carbon pump storage potentially dominating marine carbon sequestration over multicentennial timescales. Biological carbon pump storage thus represents an increasingly
dampening carbon-climate feedback.}