FN Archimer Export Format
PT J
TI Sea Level controls on Agulhas Leakage Salinity and the Atlantic Overturning Circulation
BT 
AF Nuber, Sophie
   Rae, James
   Andersen, Morten
   Zhang, Xu
   de Boer, Bas
   Dumont, Matthew
   Sun, Yuchen
   Mithan, Huw
   Hall, Ian
   Barker, Stephen
AS 1:1;2:2;3:3;4:4;5:5;6:2;7:;8:1;9:6;10:7;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 National Taiwan University, Taiwan
   University of St Andrews, UK
   School of Earth and Ocean Sciences, Cardiff University, Uk
   State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, China
   Vrije Universiteit Amsterdam, Netherlands
   School of Earth and Ocean Sciences Sciences
   Cardiff University, UK
C2 UNIV NATL TAIWAN NTU, TAIWAN
   UNIV ST ANDREWS, UK
   UNIV CARDIFF, UK
   CHINESE ACAD SCI, CHINA
   UNIV VRIJE AMSTERDAM, NETHERLANDS
   UNIV SOUTHAMPTON, UK
   CARDIFF UNIVERSITY, UK
TC 0
UR https://archimer.ifremer.fr/doc/00733/84504/89584.pdf
   https://archimer.ifremer.fr/doc/00733/84504/89585.docx
LA English
DT Article
CR MD 122 / WEPAMA
   MOZAPHARE-MD104
BO Marion Dufresne
DE ;Agulhas leakage salinity;Atlantic overturning circulation;Indian Ocean
AB The Indian Ocean has been proposed as an important source of salt for North Atlantic deep-water convection sites, via the Agulhas Leakage, and may thus drive changes in the ocean’s overturning circulation. However, while past changes in Agulhas leakage volume have been explored, little is known about this water’s salt content, representing a major gap in our understanding of Agulhas salinity supply. Here, we present new planktonic foraminiferal Mg/Ca-derived sea surface temperatures (SST) and stable isotope-derived salinity reconstructions for the last 1.2Ma from the western Indian Ocean source waters of the Agulhas Leakage to investigate glacial-interglacial changes in surface water properties. We find that SST and relative salinity both increase during glaciation, leading to high salinity and SST during glacial maxima. We show that the onset of surface salinification and warming in the Indian Ocean occurs during a phase of rapid land-bridge exposure in the Indonesian archipelago induced by sea level lowering. We link these findings to new global climate model results which show that the export of salt from the Indian Ocean via the Agulhas Leakage can directly impact the deglacial Atlantic meridional overturning circulation and therefore global climate. 
PY 2021
PD JAN
SO Research Square
PU Research Square Platform LLC
IS Version 1
DI 10.21203/rs.3.rs-1038170/v1
ID 84504
ER

EF