caa a22 4500 605471975 CHVBK 20210128100335.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s00382-014-2443-7 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2443-7 How the AMOC affects ocean temperatures on decadal to centennial timescales: the North Atlantic versus an interhemispheric seesaw [Elektronische Daten] [L. Muir, A. Fedorov] This study investigates how variations of the Atlantic meridional overturning circulation (AMOC) affect sea surface temperature (SST) within the simulations of the coupled model intercomparison project phase 5. In particular, we explore whether the SST response is interhemispheric in nature, specifically as reflected in the Atlantic SST Dipole index, or whether the response is localized more in the North Atlantic Ocean. In the absence of direct observational data, this Dipole index has been proposed to approximate AMOC variations over the duration of the instrumental temperature record. We find that typically, on timescales between decadal and centennial, the SST Dipole index correlates with the AMOC with coefficients ranging from 0.2 to 0.7, typically with a 0-6year lag, and thus explains less than half of the AMOC variance. In just two models this value slightly exceeds 50%. Even for the models with the highest correspondence between the AMOC and the Dipole index, the correlation between the two variables is controlled mainly by SST variations in the North Atlantic, not the South Atlantic, both for the model control and historical simulations. Consequently, in nearly all models, the North Atlantic SST provides a better indicator of AMOC variations than the Atlantic Dipole. Thus, on decadal to centennial timescales AMOC variability affects mainly the North Atlantic Ocean, with the sensitivity of the North Atlantic SST between 40 and 60°N, given by the multi-model average, of about 0.3°C per 1Sv of AMOC change, explaining roughly one third of the SST variance. Springer-Verlag Berlin Heidelberg, 2014 AMOC nationallicence SST Dipole nationallicence AOGCMs nationallicence Muir L. Department of Geology and Geophysics, Yale University, New Haven, CT, USA aut Fedorov A. Department of Geology and Geophysics, Yale University, New Haven, CT, USA aut Climate Dynamics Springer Berlin Heidelberg 45/1-2(2015-07-01), 151-160 0930-7575 45:1-2<151 2015 45 382 https://doi.org/10.1007/s00382-014-2443-7 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/s00382-014-2443-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Muir L. Department of Geology and Geophysics, Yale University, New Haven, CT, USA aut NATIONALLICENCE 700 1- Fedorov A. Department of Geology and Geophysics, Yale University, New Haven, CT, USA aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 45/1-2(2015-07-01), 151-160 0930-7575 45:1-2<151 2015 45 382