Dansgaard-Oeschger and Heinrich event temperature anomalies in the North Atlantic set by sea ice, frontal position and thermocline structure
| Type | Article | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Date | 2022-08 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Pedro J.B.1, 2, 3, Andersson C.4, Vettoretti G. 3, Voelker A.H.L.5, 6, Waelbroeck C.7, Dokken T.M.8, 9, Jensen M.F.8, Rasmussen S.O.3, Sessford E.G.8, Jochum M.3, Nisancioglu K.H.8, 9, 10 |
||||||||||||
| Affiliation(s) | 1 : Australian Antarctic Division, Kingston, Tasmania, Australia 2 : Australian Antarctic Program Partnership, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia 3 : Physics of Ice, Climate and Earth, University of Copenhagen, Copenhagen, Denmark 4 : NORCE Norwegian Research Centre AS, Bjerknes Centre for Climate Research, Bergen, Norway 5 : Divisao Geologia e Georecursos Marinhos, Instituto Portugues Do Mar e da Atmosfera, Alges, Portugal 6 : Centre of Marine Sciences (CCMAR), University of the Algarve, Faro, Portugal 7 : Sorbonne Université, CNRS-IRD-MNHN (LOCEAN UMR 7159), Paris, France 8 : Department of Earth Science, University of Bergen, Bergen, Norway 9 : Bjerknes Centre for Climate Research, Bergen, Norway 10 : Center for Earth Evolution and Dynamics, University of Oslo, Oslo, Norway |
||||||||||||
| Source | Quaternary Science Reviews (0277-3791) (Elsevier BV), 2022-08 , Vol. 289 , P. 107599 (16p.) | ||||||||||||
| DOI | 10.1016/j.quascirev.2022.107599 | ||||||||||||
| WOS© Times Cited | 12 | ||||||||||||
| Keyword(s) | Dansgaard-Oeschger event, Heinrich event, abrupt climate change, marine sediment core, ice core, sea ice | ||||||||||||
| Abstract | We use eighteen timescale-synchronised near-surface temperature reconstructions spanning 10–50 thousand years before present to clarify the regional expression of Dansgaard-Oeschger (D-O) and Heinrich (H) events in the North Atlantic. The North Atlantic Drift region shows D-O temperature variations of ca. 2–5° with Greenland-like structure. The Western Iberian Margin region also shows Greenland-like structure, but with more pronounced surface cooling between interstadials and Heinrich stadials (ca. 6–9 °C) than between interstadials and non-Heinrich stadials (ca. 2–3 °C). The southern Nordic Seas show smaller D-O temperature anomalies (ca. 1–2 °C) that appear out of phase with Greenland. These spatial patterns are replicated in a new global climate model simulation that features unforced (D-O-like) and freshwater forced (H-like) abrupt climate changes. The model simulations and observations suggest consistently that the spatial expression and amplitude of D-O and H event temperature anomalies are dominated by coupled changes in the Atlantic Meridional Overturning, sea ice extent, polar front position and thermocline structure. |
||||||||||||
| Full Text |
|