Decadal variability of sea surface temperatures off North Iceland over the last 2000 years - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Earth and Planetary Science Letters Année : 2008

Decadal variability of sea surface temperatures off North Iceland over the last 2000 years

Résumé

Ocean variability at decadal time-scales remains poorly described partly because of the scarcity of high temporal resolution marine records. Here, we present a reconstruction of Sea Surface Temperatures (SSTs) over the past twomillennia at unprecedented temporal resolution (2 to 5 years), from a marine core located off North Iceland. Alkenone paleothermometry was used to infer SST variability, and tephrochronology to build the age model. Spectral analyses of the SSTsignal indicate intermittent 20–25 year oscillations, with periods of strong and weak power, that are likely reflecting the ocean response to wind forcing, presumably the North Atlantic Oscillation (NAO). Warmer SSTs and paleo-magnetic proxy data, between 1000 and 1350 year A.D., overlapping theMedievalWarm Period (MWP), suggest enhanced heat transport across the Denmark Strait by the North Icelandic IrmingerCurrent (NIIC). This is in contrast with the subsequent period, which includes the Little IceAge (LIA), showing continuous cooling towards the 20th century.Reduced NIIC flow through theDenmark Strait likely resulting from higher freshwater and sea ice export from the Arctic would account for the observed colder conditions.
Fichier principal
Vignette du fichier
Sicre_et_al_-_2008_-_EPSL.pdf (854.05 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

insu-00311666 , version 1 (20-08-2008)

Identifiants

Citer

Marie Alexandrine Sicre, Jérémy Jacob, Ullah Ezat, Sonia Rousse, Catherine Kissel, et al.. Decadal variability of sea surface temperatures off North Iceland over the last 2000 years. Earth and Planetary Science Letters, 2008, 268, pp.137-142. ⟨10.1016/j.epsl.2008.01.011⟩. ⟨insu-00311666⟩
343 Consultations
1083 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More