caa a22 4500 605474869 CHVBK 20210128100349.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00382-014-2211-8 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2211-8 An interhemispheric mechanism for glacial abrupt climate change [Elektronische Daten] [Rubén Banderas, Jorge Alvarez-Solas, Alexander Robinson, Marisa Montoya] The last glacial period was punctuated by abrupt climate changes that are widely considered to result from millennial-scale variability of the Atlantic meridional overturning circulation (AMOC). However, the origin of these AMOC reorganizations remains poorly understood. The climatic connection between both hemispheres indicated by proxies suggests that the Southern Ocean (SO) could regulate this variability through changes in winds and atmospheric CO $$_{2}$$ 2 concentration. Here, we investigate this hypothesis using a coupled climate model forced by prescribed CO $$_{2}$$ 2 and SO wind-stress variations. We find that the AMOC exhibits an oscillatory behavior between weak and strong circulation regimes which is ultimately caused by changes in the meridional density gradient of the Atlantic Ocean. The evolution of the simulated climatic patterns matches the amplitude and timing of the largest events that occurred during the last glacial period and their widespread climatic impacts. Our results suggest the existence of an internal interhemispheric oscillation mediated by the bipolar seesaw that could promote glacial abrupt climate changes through variations in atmospheric CO $$_{2}$$ 2 levels, the strength of the SO winds and AMOC reorganizations, and provide an explanation for the pervasive Antarctic-like climate signal found in proxy records worldwide. Springer-Verlag Berlin Heidelberg, 2014 Abrupt climate change nationallicence Paleoclimate modeling nationallicence Dansgaard-Oeschger events nationallicence Atlantic meridional overturning circulation nationallicence Banderas Rubén Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040, Madrid, Spain aut Alvarez-Solas Jorge Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040, Madrid, Spain aut Robinson Alexander Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040, Madrid, Spain aut Montoya Marisa Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040, Madrid, Spain aut Climate Dynamics Springer Berlin Heidelberg 44/9-10(2015-05-01), 2897-2908 0930-7575 44:9-10<2897 2015 44 382 https://doi.org/10.1007/s00382-014-2211-8 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/s00382-014-2211-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Banderas Rubén Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040, Madrid, Spain aut NATIONALLICENCE 700 1- Alvarez-Solas Jorge Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040, Madrid, Spain aut NATIONALLICENCE 700 1- Robinson Alexander Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040, Madrid, Spain aut NATIONALLICENCE 700 1- Montoya Marisa Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040, Madrid, Spain aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 44/9-10(2015-05-01), 2897-2908 0930-7575 44:9-10<2897 2015 44 382