Atmospheric CO2 response to AMOC changes under high and low obliquity ...

• Main Author: Menviel, Laurie
• Format: Dataset
• Language: English
• Published: UNSW Sydney 2024
• Subjects: AMOC; Carbon cycle; Orbital parameters; 370201 Climate change processes; 370203 Greenhouse gas inventories and fluxes; 190501 Climate change models; 190507 Global effects of climate change excl. Australia, New Zealand, Antarctica and the South Pacific excl. social impacts; New Zealand; Pacific; Antarc*; Antarctica; Ice Sheet; North Atlantic
• Online Access: https://dx.doi.org/10.26190/unsworks/30408; http://hdl.handle.net/1959.4/102810

Meltwater experiments are performed with the Earth system model of intermediate complexity LOVECLIM (Goosse et al., 2010) under 49ka and 12 ka boundary conditions with their appropriate obliquity values as well as with low obliquity (22.1 deg). The impact on atmospheric CO2 and the oceanic and terrestrial carbon cycle is assessed to understand the impact of obliquity on the carbon cycle. Details on the scientific context and experimental design are in Legrain E., Capron E., Menviel, L. et al., "Centennial-scale variations in the carbon cycle enhanced by high obliquity", 2024. ... : The Earth system model of intermediate complexity LOVECLIM (Goosse et al., 2010) is spined up under 49ka and 12 ka boundary conditions (ice-sheet geometry and albedo (Abe-Ouchi et al., 2013), orbital parameters (Berger et al,, 1978)) with prognostic atmospheric CO2. These spinups are branched from transient simulations of the last interglacial-glacial cycle performed with LOVECLIM, so that the initial conditions of these spinups also have appropriate greenhouse gas forcing (Koehler et al., 2017). Two other control experiments are performed. They are similar to the 49ka and 12ka control, but have a low obliquity of 22.1 degrees. From these 4 control states, freshwater is added into the North Atlantic (60W-10°W, 50N-60°N) at a rate of 0.3 Sv for the 49ka experiments and 0.16 Sv for the 12ka experiments. ...