Dansgaard-Oeschger and Heinrich event temperature anomalies in the North Atlantic set by sea ice, frontal position and thermocline structure
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Dansgaard-Oeschger and Heinrich event temperature anomalies in the North Atlantic set by sea ice, frontal position and thermocline structure. / Pedro, J. B.; Andersson, C.; Vettoretti, G.; Voelker, A. H.L.; Waelbroeck, Claire; Dokken, T. M.; Jensen, M. F.; Rasmussen, S. O.; Sessford, E. G.; Jochum, M.; Nisancioglu, K. H.
I: Quaternary Science Reviews, Bind 289, 107599, 01.08.2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Dansgaard-Oeschger and Heinrich event temperature anomalies in the North Atlantic set by sea ice, frontal position and thermocline structure
AU - Pedro, J. B.
AU - Andersson, C.
AU - Vettoretti, G.
AU - Voelker, A. H.L.
AU - Waelbroeck, Claire
AU - Dokken, T. M.
AU - Jensen, M. F.
AU - Rasmussen, S. O.
AU - Sessford, E. G.
AU - Jochum, M.
AU - Nisancioglu, K. H.
N1 - Publisher Copyright: © 2022 The Authors
PY - 2022/8/1
Y1 - 2022/8/1
N2 - 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.
AB - 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.
KW - abrupt climate change
KW - Dansgaard-Oeschger event
KW - Heinrich event
KW - ice core
KW - marine sediment core
KW - sea ice
U2 - 10.1016/j.quascirev.2022.107599
DO - 10.1016/j.quascirev.2022.107599
M3 - Journal article
AN - SCOPUS:85132821879
VL - 289
JO - Quaternary Science Reviews
JF - Quaternary Science Reviews
SN - 0277-3791
M1 - 107599
ER -
ID: 318877365