FN Archimer Export Format PT J TI Surface changes in the North Atlantic meridional overturning circulation during the last millennium BT AF WANAMAKER, Alan D., Jr. BUTLER, Paul G SCOURSE, James D. HEINEMEIER, Jan EIRIKSSON, Jon KNUDSEN, Karen Luise RICHARDSON, Christopher A. AS 1:1,2;2:2;3:2;4:3;5:4,5;6:6;7:2; FF 1:;2:;3:;4:;5:;6:;7:; C1 Iowa State Univ, Dept Geol & Atmospher Sci, Ames, IA 50011 USA. Bangor Univ, Sch Ocean Sci, Coll Nat Sci, Menai Bridge LL59 5AB, Anglesey, Wales. Aarhus Univ, AMS Dating Ctr 14C, Dept Phys & Astron, DK-8000 Aarhus C, Denmark. Univ Iceland, Inst Earth Sci, IS-101 Reykjavik, Iceland. Univ Copenhagen, Nat Hist Museum Denmark, Ctr GeoGenet, DK-1350 Copenhagen, Denmark. Aarhus Univ, Dept Geosci, DK-8000 Aarhus C, Denmark. C2 UNIV IOWA STATE, USA UNIV BANGOR, UK UNIV AARHUS, DENMARK UNIV ICELAND, ICELAND UNIV COPENHAGEN, DENMARK UNIV AARHUS, DENMARK IN DOAJ IF 10.02 TC 135 UR https://archimer.ifremer.fr/doc/00265/37651/36977.pdf LA English DT Article CR IMAGES V LEG 1-MD114 IMAGES V LEG 4-MD114 BO Marion Dufresne AB Despite numerous investigations, the dynamical origins of the Medieval Climate Anomaly and the Little Ice Age remain uncertain. A major unresolved issue relating to internal climate dynamics is the mode and tempo of Atlantic meridional overturning circulation variability, and the significance of decadal-to-centennial scale changes in Atlantic meridional overturning circulation strength in regulating the climate of the last millennium. Here we use the time-constrained high-resolution local radiocarbon reservoir age offset derived from an absolutely dated annually resolved shell chronology spanning the past 1,350 years, to reconstruct changes in surface ocean circulation and climate. The water mass tracer data presented here from the North Icelandic shelf, combined with previously published data from the Arctic and subtropical Atlantic, show that surface Atlantic meridional overturning circulation dynamics likely amplified the relatively warm conditions during the Medieval Climate Anomaly and the relatively cool conditions during the Little Ice Age within the North Atlantic sector. PY 2012 PD JUL SO Nature Communications SN 2041-1723 PU Nature Publishing Group VL 3 IS 899 UT 000306099900026 BP 1 EP 7 DI 10.1038/ncomms1901 ID 37651 ER EF