Publication Date:
2024-06-26
Description:
Here we present a 1200 yr long benthic foraminiferal Mg/Ca based temperature and oxygen isotope record from a ~900 m deep sediment core off northwest Africa to show that atmosphere-ocean interactions in the eastern subpolar gyre are transferred at central water depth into the eastern boundary of the subtropical gyre. Further we link the variability of the NAO (over the past 165 yrs) and solar irradiance (Late Holocene) and their control on subpolar mode water formation to the multidecadal variability observed at mid-depth in the eastern subtropical gyre. Our results show that eastern North Atlantic central waters cooled by up to ~0.8± 0.7 °C and densities decreased by Sigma theta=0.3±0.2 during positive NAO years and during minima in solar irradiance during the Late Holocene. The presented records demonstrate the sensitivity of central water formation to enhanced atmospheric forcing and ice/freshwater fluxes into the eastern subpolar gyre and the importance of central water circulation for cross-gyre climate signal propagation during the Late Holocene.
Keywords:
Center for Marine Environmental Sciences; GeoB6007-1; GeoB6007-2; Gravity corer (Kiel type); Integrierte Analyse zwischeneiszeitlicher Klimadynamik; INTERDYNAMIK; M45/5a; MARUM; Meteor (1986); MUC; MultiCorer; SL
Type:
Dataset
Format:
application/zip, 3 datasets
