the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Minor effect of meltwater on the ocean circulation during deglaciation
Abstract. Decaying Northern Hemisphere ice sheets during deglaciation affect the high latitude hydrological balance in the North Atlantic and therefore the ocean circulation after the Last Glacial Maximum. Surprisingly, geological data suggest that meltwater fluxes of about 14–20 m sea-level equivalent flushed into the North Atlantic without significantly influencing the Atlantic meridional overturning circulation. Using a three-dimensional ocean circulation model coupled to an energy balance model of the atmosphere, we investigate the response of the ocean circulation to spatio-temporal variable deglacial freshwater discharges. Freshwater inputs are simulated by a three-dimensional thermo-mechanical ice sheet model of the Northern Hemisphere. In our experiments, we find a strong sensitivity of the ocean circulation when the deglacial meltwater is injected into the surface layers yielding a quasi shut-down. On the other hand, the parameterization of huge sub-glacial outbursts as so-called hyperpycnal flows are mimicked through bottom injections in ocean models leading to a reduced sensitivity of the overturning circulation against freshwater perturbations and providing a consistent representation of the deglacial climate evolution.
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RC C354: 'Review 1', Anonymous Referee #1, 08 Sep 2012
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SC C397: 'Preliminary answer to the Interactive comment of Referee #1', Gerrit Lohmann, 13 Sep 2012
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RC C401: 'Clarification of concern', Anonymous Referee #1, 14 Sep 2012
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RC C401: 'Clarification of concern', Anonymous Referee #1, 14 Sep 2012
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SC C397: 'Preliminary answer to the Interactive comment of Referee #1', Gerrit Lohmann, 13 Sep 2012
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RC C399: 'Review', Anonymous Referee #2, 13 Sep 2012
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RC C406: 'review', Anonymous Referee #3, 19 Sep 2012


-
RC C354: 'Review 1', Anonymous Referee #1, 08 Sep 2012
-
SC C397: 'Preliminary answer to the Interactive comment of Referee #1', Gerrit Lohmann, 13 Sep 2012
-
RC C401: 'Clarification of concern', Anonymous Referee #1, 14 Sep 2012
-
RC C401: 'Clarification of concern', Anonymous Referee #1, 14 Sep 2012
-
SC C397: 'Preliminary answer to the Interactive comment of Referee #1', Gerrit Lohmann, 13 Sep 2012
-
RC C399: 'Review', Anonymous Referee #2, 13 Sep 2012
-
RC C406: 'review', Anonymous Referee #3, 19 Sep 2012
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Cited
2 citations as recorded by crossref.
- Impact of Tectonic, Glacial and Contour Current Processes on the Late Cenozoic Sedimentary Development of the Southeast Greenland Margin K. Heirman et al. 10.3390/geosciences9040157
- Sedimentary processes and seabed morphology of the Southwest Greenland margin T. Nielsen et al. 10.1007/s41063-019-00069-5