caa a22 4500 605473757 CHVBK 20210128100344.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00382-014-2279-1 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2279-1 The influence of Greenland ice sheet melting on the Atlantic meridional overturning circulation during past and future warm periods: a model study [Elektronische Daten] [M. Blaschek, P. Bakker, H. Renssen] The sensitivity of the climate system to changes in radiative forcing is crucial for our understanding of past and future climates. Especially important are feedbacks related to melting of ice sheets like the Greenland ice sheet (GIS) and its potential impact on the Atlantic meridional overturning circulation (AMOC). These effects are likely to delay and dampen predicted long-term warming trends. Estimates of climate sensitivity may be deduced from palaeoclimate-reconstructions, but this raises the question whether past climate sensitivity is applicable to the future. Therefore we have analysed the impact of GIS melt water on the AMOC strength in two past warm climates (last interglacial and early present interglacial) and three future scenarios with three different model parameter sets. These model parameter sets represent three different model sensitivities to freshwater perturbation: low, moderate and high. In both the moderate and high sensitivity versions, we find for lower GIS melt rates (below 54mSv, Sv=106m3/s) a clear difference between past and future warm climates in the sensitivity of the AMOC to GIS melt. This difference is connected to the convective activity in the Labrador Sea and the amount of additional surface freshening due to sea ice melting. In contrast, for higher GIS melt rates (over 54mSv) we find similar reductions of the AMOC strength in all cases. Considering the low sensitivity version of our model, we find that for all GIS melt rates the influence of freshwater forcing on the AMOC is independent of the background climate. Our results and implications are thus strongly determined by the parameter set considered in our model. Nonetheless, our results from two out of three model versions suggest that proxy-based reconstructions of past AMOC sensitivity to GIS melt are likely to be misleading if interpreted for future applications. Springer-Verlag Berlin Heidelberg, 2014 Interglacials nationallicence Greenland ice sheet nationallicence Climate modelling nationallicence Climate sensitivity nationallicence AMOC nationallicence Sea ice nationallicence Blaschek M. Cluster Earth and Climate, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081HV, Amsterdam, The Netherlands aut Bakker P. Cluster Earth and Climate, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081HV, Amsterdam, The Netherlands aut Renssen H. Cluster Earth and Climate, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081HV, Amsterdam, The Netherlands aut Climate Dynamics Springer Berlin Heidelberg 44/7-8(2015-04-01), 2137-2157 0930-7575 44:7-8<2137 2015 44 382 https://doi.org/10.1007/s00382-014-2279-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2279-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Blaschek M. Cluster Earth and Climate, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081HV, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Bakker P. Cluster Earth and Climate, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081HV, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Renssen H. Cluster Earth and Climate, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081HV, Amsterdam, The Netherlands aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 44/7-8(2015-04-01), 2137-2157 0930-7575 44:7-8<2137 2015 44 382