(Table 2) Age determination of sediment cores from the Portuguese Margin

We demonstrate that changes in the behavior of the Mediterranean Outflow Water (MOW) prior to and through the last deglaciation played an important role in promoting Meridional Overturning Circulation (MOC). Estimation of past MOW salt and heat fluxes indicates that they gradually increased through...

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Bibliographic Details
Main Authors: Rogerson, Mike, Rohling, Eelco J, Weaver, Philip PE
Format: Dataset
Language:English
Published: PANGAEA 2014
Subjects:
Age
14C AMS
14C milieu/reservoir corrected (-400 yr)
dated
dated standard deviation
Calendar age
D13686
D13896
D13900
D249
DEPTH
sediment/rock
Discovery (1962)
Elevation of event
Event label
Laboratory code/label
Latitude of event
Longitude of event
PC
Piston corer
Portuguese Margin
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.833682
https://doi.org/10.1594/PANGAEA.833682
Description
Summary:We demonstrate that changes in the behavior of the Mediterranean Outflow Water (MOW) prior to and through the last deglaciation played an important role in promoting Meridional Overturning Circulation (MOC). Estimation of past MOW salt and heat fluxes indicates that they gradually increased through the last deglaciation. Between 17.5 and 14.6 thousand years ago (ka B.P., where B.P. references year 1950), net evaporation from the Mediterranean exported sufficient fresh water from the North Atlantic catchment to cause an average salinity increase of 0.5 psu throughout the upper 2000 m of the entire North Atlantic to the north of 25°N. Combined with rapid intensification and shoaling of the MOW plume, which we identify around 15-14.5 ka B.P., this deglacial MOW-related salt accumulation preconditioned the North Atlantic for abrupt resumption of the MOC at 14.6 ka B.P.

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