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

• 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

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.