AMOC Recovery in a Multicentennial Scenario Using a Coupled Atmosphere‐Ocean‐Ice Sheet Model.

Ackermann, L. , Danek, C. , Gierz, P. and Lohmann, G. (2020) AMOC Recovery in a Multicentennial Scenario Using a Coupled Atmosphere‐Ocean‐Ice Sheet Model. Open Access Geophysical Research Letters, 47 (16). e2019GL086810. DOI 10.1029/2019GL086810.

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Abstract

We simulate the two Coupled Model Intercomparison Project scenarios RCP4.5 and RCP8.5, to assess the effects of melt‐induced fresh water on the Atlantic meridional overturning circulation (AMOC). We use a newly developed climate model with high resolution at the coasts, resolving the complex ocean dynamics. Our results show an AMOC recovery in simulations run with and without an included ice sheet model. We find that the ice sheet adds a strong decadal variability on the freshwater release, resulting in intervals in which it reduces the surface runoff by high accumulation rates. This compensating effect is missing in climate models without dynamic ice sheets. Therefore, we argue to assess those freshwater hosing experiments critically, which aim to parameterize Greenland's freshwater release. We assume the increasing net evaporation over the Atlantic and the resulting increase in ocean salinity, to be the main driver of the AMOC recovery.

Document Type: Article
Keywords: Atlantic meridional overturning circulation; Greenland ice sheet; ice sheet model; future scenarios; AMOC recovery; ice sheet buffering
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2019GL086810
ISSN: 0094-8276
Projects: PalMod
Date Deposited: 16 Sep 2020 12:40
Last Modified: 16 Sep 2020 12:40
URI: http://oceanrep.geomar.de/id/eprint/50506

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