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Impact of mid-glacial ice sheets on deep ocean circulation and global climate

Abstract.

"This study explores the effect of southward expansion of Northern Hemisphere (American) mid-glacial ice sheets on the global climate and the Atlantic Meridional Overturning Circulation (AMOC) as well as the processes by which the ice sheets modify the AMOC. For this purpose, simulations of Marine Isotope Stage (MIS) 3 (36 ka) and 5a (80 ka) are performed with an atmosphere–ocean general circulation model. In the MIS3 and MIS5a simulations, the global average temperature decreases by 5.0 and 2.2 ∘C, respectively, compared with the preindustrial climate simulation. The AMOC weakens by 3 % in MIS3, whereas it strengthens[...]"

 

Source: EGU-European Geosciences Union 
Authors: Sam Sherriff-Tadano et al.
DOI: https://doi.org/10.5194/cp-17-95-2021

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Evaluating climate geoengineering proposals in the context of the Paris Agreement temperature goals

Abstract.

"Current mitigation efforts and existing future commitments are inadequate to accomplish the Paris Agreement temperature goals. In light of this, research and debate are intensifying on the possibilities of additionally employing proposed climate geoengineering technologies, either through atmospheric carbon dioxide removal or farther-reaching interventions altering the Earth’s radiative energy budget. Although research indicates that several techniques may eventually have the physical potential to contribute to limiting climate change, all are in early stages of development, involve substantial uncertainties and risks, and raise ethical and governance dilemmas. [...]"

Source: Nature Communications
Authors: Mark G. Lawrence et al.
DOI: 10.1038/s41467-018-05938-3

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