Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
doi:10.5194/cp-2016-115
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
21 Nov 2016
Review status
This discussion paper is under review for the journal Climate of the Past (CP).
Holocene evolution of the North Atlantic subsurface transport
Janne Repschläger1,a, Dieter Garbe-Schönberg1, Mara Weinelt2, and Ralph Schneider1 1Institute of Geosciences, Kiel University, 24118 Kiel, Germany
2Institute of Prehistoric and Protohistoric Archaeology, Kiel University, 24118 Kiel, Germany
anow at: Climate Geochemistry Department, Max-Planck-Institute for Chemistry, 55128 Mainz, Germany
Abstract. Previous studies suggested that short term freshening events in the subpolar gyre can be counterbalanced by interactions with the subtropical gyre and thus stabilize the Atlantic Meridional Overturning Circulation (AMOC). However, little is known about the intergyre transport pathways. Here, we reconstruct surface and subsurface transport between the subtropical and polar North Atlantic during the last 10000 years, by combining new temperature and salinity reconstructions obtained from surface and subsurface dwelling foraminifera with published data from the tropical and subpolar North Atlantic and published foraminiferal abundance data from the subtropical North Atlantic. These observations imply an overall stable warm surface water transport. Subsurface warm water transport started at about 8 ka with subtropical heat storage, and reached its full strength at about 7 ka, probably associated with the onset of the modern AMOC mode. Comparison of different potential forcing mechanisms suggests a freshwater control on these ocean transport changes.

Citation: Repschläger, J., Garbe-Schönberg, D., Weinelt, M., and Schneider, R.: Holocene evolution of the North Atlantic subsurface transport, Clim. Past Discuss., doi:10.5194/cp-2016-115, in review, 2016.
Janne Repschläger et al.
Janne Repschläger et al.

Data sets

Mg/Ca ratio, oxygen isotopes and surface temperatures derived from G. ruber and G. truncatulinoides in core GEOFAR KF16. Dataset #868108
J. Repschläger, D. Garbe-Schönberg, and M. Weinelt
https://doi.pangaea.de/10.1594/PANGAEA.868108
Janne Repschläger et al.

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Short summary
We reconstruct changes in the warm water transport from the subtropical into the subpolar North Atlantic over the last 10 000 years. We use stable isotope and Mg / Ca ratios measured on surface and subsurface dwelling foraminifera. Results indicate an overall stable warm water transport at surface. The northward transport at subsurface evolves stepwise and stabilizes at 7 ka BP on the modern mode. These ocean transport changes seem to be controlled by the meltwater inflow into the North Atlantic.
We reconstruct changes in the warm water transport from the subtropical into the subpolar North...
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