caa a22 4500 605473838 CHVBK 20210128100344.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00382-014-2153-1 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2153-1 On the stability of the Atlantic meridional overturning circulation during the last deglaciation [Elektronische Daten] [Wei Liu, Zhengyu Liu, Jun Cheng, Haibo Hu] Using a generalized stability indicator L, we explore the stability of the Atlantic meridional overturning circulation (AMOC) during the last deglaciation based on a paleoclimate simulation. From the last glacial maximum, as forced by various external climate forcings, notably the meltwater forcing, the AMOC experiences a collapse and a subsequent rapid recovery in the early stage of deglaciation. This change of the AMOC induces an anomalous freshwater divergence and later convergence across the Atlantic and therefore leads to a positive L, suggesting a negative basin-scale salinity advection feedback and, in turn, a mono-stable deglacial AMOC. Further analyses show that most anomalous freshwater is induced by the AMOC via the southern boundary of the Atlantic at 34°S where the freshwater transport (M ovS ) is about equally controlled by the upper branch of the AMOC and the upper ocean salinity along 34°S. From 19 to 17ka, as a result of multiple climate feedbacks associated with the AMOC change, the upper ocean at 34°S is largely salinified, which helps to induce a switch in M ovS , from import to export. Our study has important implications to the deglacial simulations by climate models. A decomposition of L shows that the AMOC stability is mostly determined by two terms, the salinity stratification at 34°S and the change of stratification with the AMOC. Both terms appear positive in model. However, the former is likely to be distorted towards positive, as associated with a common bias existing over the South Atlantic in climate models. Therefore, the AMOC is potentially biased towards mono-stability in most paleoclimate simulations. Springer-Verlag Berlin Heidelberg, 2014 AMOC nationallicence Stability indicator nationallicence Freshwater transport nationallicence Feedback nationallicence The last deglaciation nationallicence Liu Wei Cooperative Institute for Climate and Satellites, North Carolina State University, Raleigh, NC, USA aut Liu Zhengyu Lab. Climate, Ocean and Atmosphere Studies, Peking University, Beijing, China aut Cheng Jun Key Laboratory of Meteorological Disaster of Ministry of Education, School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China aut Hu Haibo School of Atmospheric Sciences, Nanjing University, Nanjing, China aut Climate Dynamics Springer Berlin Heidelberg 44/5-6(2015-03-01), 1257-1275 0930-7575 44:5-6<1257 2015 44 382 https://doi.org/10.1007/s00382-014-2153-1 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/s00382-014-2153-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu Wei Cooperative Institute for Climate and Satellites, North Carolina State University, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Liu Zhengyu Lab. Climate, Ocean and Atmosphere Studies, Peking University, Beijing, China aut NATIONALLICENCE 700 1- Cheng Jun Key Laboratory of Meteorological Disaster of Ministry of Education, School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China aut NATIONALLICENCE 700 1- Hu Haibo School of Atmospheric Sciences, Nanjing University, Nanjing, China aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 44/5-6(2015-03-01), 1257-1275 0930-7575 44:5-6<1257 2015 44 382