FN Archimer Export Format
PT J
TI Southward displacement of the North Atlantic Subtropical Gyre circulation system during North Atlantic cold spells
BT 
AF Reißig, S.
   Nürnberg, D.
   Bahr, A.
   Poggemann, D.‐W.
   Hoffmann, J.
AS 1:1;2:1;3:2;4:1;5:2;
FF 1:;2:;3:;4:;5:;
C1 GEOMAR Helmholtz Centre for Ocean Research Kiel Kiel , Germany
   Heidelberg University, Institute of Earth Science Heidelberg, Germany
C2 GEOMAR HELMHOLTZ CTR OCEAN RES KIEL, GERMANY
   UNIV HEIDELBERG, GERMANY
IF 2.888
TC 21
UR https://archimer.ifremer.fr/doc/00491/60284/63711.pdf
   https://archimer.ifremer.fr/doc/00491/60284/63712.pdf
LA English
DT Article
CR MD 168 / AMOCINT (IMAGES XVII)
BO Marion Dufresne
AB During times of deglacial Atlantic Meridional Overturning Circulation (AMOC) perturbations, the tropical Atlantic experienced considerable warming at subsurface levels. Coupled ocean‐atmosphere simulations corroborate the tight teleconnection between the tropical Atlantic and climate change at high northern latitudes, but still underestimate the relevance of the subsurface N Atlantic Subtropical Gyre (STG) for heat and salt storage and its sensitivity to rapid climatic change. We here reconstruct vertical and lateral temperature and salinity gradients in the tropical W Atlantic and the Caribbean over the last 30 kyrs, based on planktic deep and shallow dwelling foraminiferal Mg/Ca and δ18O‐records. The rapid and large amplitude subsurface changes illustrate a dynamic STG associated with abrupt shifts of North Atlantic hydrographic and atmospheric regimes. During full glacial conditions, the STG has been shifted southward while intensified Ekman‐downwelling associated to strengthened trade winds fostered the formation of warm and saline Salinity Maximum Water (SMW). The southward propagation of SMW was facilitated by the glacially eastward deflected North Brazil Current. During periods of significant AMOC perturbations (Heinrich Stadials 1, and the Younger Dryas), extreme subsurface warming by ~6°C led to diminished lateral subsurface temperature gradients. Coevally, a deep thermocline suggests that SMW fully occupied the subsurface tropical W Atlantic and that the STG reached its southernmost position. During the Holocene, modern‐like conditions gradually developed with the northward retreat of SMW and the development of a strong thermocline ridge between the Subtropical Gyre and the tropical W Atlantic. 
PY 2019
PD MAY
SO Paleoceanography And Paleoclimatology
SN 2572-4517
PU American Geophysical Union (AGU)
VL 34
IS 5
UT 000471238100009
BP 866
EP 885
DI 10.1029/2018PA003376
ID 60284
ER

EF