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  Holocene evolution of the North Atlantic subsurface transport

Repschläger, J., Garbe-Schönberg, D., Weinelt, M., & Schneider, R. (2017). Holocene evolution of the North Atlantic subsurface transport. Climate of the Past, 13(4), 333-344. doi:10.5194/cp-13-333-2017.

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Repschläger, J.1, Author              
Garbe-Schönberg, Dieter, Author
Weinelt, Mara, Author
Schneider, Ralph, Author
Affiliations:
1Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_2237635              

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 Abstract: Previous studies suggested that short-term freshening events in the subpolar gyre can be counterbalanced by advection of saline waters from the subtropical gyre and thus stabilize the Atlantic Meridional Overturning Circulation (AMOC). However, little is known about the inter-gyre transport pathways. Here, we infer changes in surface and subsurface transport between the subtropical and polar North Atlantic during the last 11 000 years, by combining new temperature and salinity reconstructions obtained from combined δ18O and Mg ∕ Ca measurements on surface and subsurface dwelling foraminifera with published foraminiferal abundance data from the subtropical North Atlantic, and with salinity and temperature data from the tropical and subpolar North Atlantic. This compilation implies an overall stable subtropical warm surface water transport since 10 ka BP. In contrast, subsurface warm water transport started at about 8 ka but still with subsurface heat storage in the subtropical gyre. The full strength of intergyre exchange was probably reached only after the onset of northward transport of warm saline subsurface waters at about 7 ka BP, associated with the onset of the modern AMOC mode. A critical evaluation of different potential forcing mechanisms leads to the assumption that freshwater supply from the Laurentide Ice Sheet was the main control on subtropical to subpolar ocean transport at surface and subsurface levels.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.5194/cp-13-333-2017
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Title: Climate of the Past
Source Genre: Journal
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Pages: - Volume / Issue: 13 (4) Sequence Number: - Start / End Page: 333 - 344 Identifier: -