The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin ...

This study combines high-resolution records of nannofossil abundances, oxygen and carbon stable isotopes, core scanning X-ray fluorescence (XRF), and ice rafted debris (IRD) to assess the paleoceanographic changes that occurred during the last deglaciation on the SW Iberian Margin. Our results revea...

Full description

Bibliographic Details
Main Authors: Ausín, Blanca, Hodell, David A., Cutmore, Anna, Eglinton, Timothy I.
Format: Text
Language:English
Published: ETH Zurich 2020
Subjects:
Paleoceanography
North Atlantic
Holocene
Deglaciation
Heinrich stadials
Nannofossils
IRD
Stable isotopes
AMOC
Online Access:https://dx.doi.org/10.3929/ethz-b-000390102
http://hdl.handle.net/20.500.11850/390102
Description
Summary:This study combines high-resolution records of nannofossil abundances, oxygen and carbon stable isotopes, core scanning X-ray fluorescence (XRF), and ice rafted debris (IRD) to assess the paleoceanographic changes that occurred during the last deglaciation on the SW Iberian Margin. Our results reveal parallel centennial-scale oscillations in coccolithophore productivity, nutricline depth and upwelling phenomena not previously observed, explained by means of arrival of iceberg-melting waters, iceberg-induced turbulent conditions, SST changes and riverine discharges. On millennial time-scales, higher primary productivity (PP), shallower nutricline, and upwelling occurrence/invigoration are observed for the Last Glacial Maximum (LGM) and Bølling-Allerød (B/A). The opposite scenario (i.e., lower productivity, deeper nutricline and upwelling weakening/absence) is linked to cold spells such as Heinrich Stadials 2 and 1 (HS2 and HS1) and the Younger Dryas (YD). Such paleoproductivity variations are attributed to ... : Quaternary Science Reviews, 230 ...

Similar Items