FN Archimer Export Format
PT J
TI Glacial reduction and millennial-scale variations in Drake Passage throughflow
BT 
AF LAMY, Frank
   ARZ, Helge W.
   KILIANC, Rolf
   LANGE, Carina B.
   LEMBKE-JENE, Lester
   WENGLER, Marc
   KAISER, Jerome
   BAEZA-URREA, Oscar
   HALL, Ian R.
   HARADA, Naomi
   TIEDEMANN, Ralf
AS 1:1;2:2;3:3,4;4:5,6;5:1;6:1;7:2;8:3;9:7;10:8;11:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;
C1 Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Marine Geol Sect, D-27570 Bremerhaven, Germany.
   Leibniz Inst Balt Sea Res, Dept Marine Geol, D-18119 Rostock, Germany.
   Univ Trier, Geol Fachbereich Raum & Umweltwissensch, D-54286 Trier, Germany.
   Univ Magallanes, Inst Patagonia, Punta Arenas 6200000, Chile.
   Univ Concepcion, Dept Oceanog, Concepcion 4030000, Chile.
   Univ Concepcion, COPAS Sur Austral Program, Ctr Oceanog Res Eastern South Pacific COPAS, Concepcion 4030000, Chile.
   Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3AT, S Glam, Wales.
   Japan Agcy Marine Earth Sci & Technol, Res & Dev Ctr Global Change, Yokosuka, Kanagawa 2370061, Japan.
C2 INST A WEGENER, GERMANY
   LEIBNIZ INST BALT SEA RES, GERMANY
   UNIV TRIER, GERMANY
   UNIV MAGALLANES, CHILE
   UNIV CONCEPCION, CHILE
   UNIV CONCEPCION, CHILE
   UNIV CARDIFF, UK
   JAMSTEC, JAPAN
IF 9.423
TC 69
UR https://archimer.ifremer.fr/doc/00351/46233/46119.pdf
LA English
DT Article
CR MD159 / PACHIDERME
BO Marion Dufresne
DE ;paleoceanography;Drake Passage;Antarctic Circumpolar Current;glacial-interglacial changes;sedimentology
AB The Drake Passage (DP) is the major geographic constriction for the Antarctic Circumpolar Current (ACC) and exerts a strong control on the exchange of physical, chemical, and biological properties between the Atlantic, Pacific, and Indian Ocean basins. Resolving changes in the flow of circumpolar water masses through this gateway is, therefore, crucial for advancing our understanding of the Southern Ocean's role in global ocean and climate variability. Here, we reconstruct changes in DP throughflow dynamics over the past 65,000 y based on grain size and geochemical properties of sediment records from the southernmost continental margin of South America. Combined with published sediment records from the Scotia Sea, we argue for a considerable total reduction of DP transport and reveal an up to similar to 40% decrease in flow speed along the northernmost ACC pathway entering the DP during glacial times. Superimposed on this long-term decrease are high-amplitude, millennial-scale variations, which parallel Southern Ocean and Antarctic temperature patterns. The glacial intervals of strong weakening of the ACC entering the DP imply an enhanced export of northern ACC surface and intermediate waters into the South Pacific Gyre and reduced Pacific-Atlantic exchange through the DP ("cold water route"). We conclude that changes in DP throughflow play a critical role for the global meridional overturning circulation and interbasin exchange in the Southern Ocean, most likely regulated by variations in the westerly wind field and changes in Antarctic sea ice extent.
PY 2015
PD NOV
SO Proceedings Of The National Academy Of Sciences Of The United States Of America
SN 0027-8424
PU Natl Acad Sciences
VL 112
IS 44
UT 000364164900044
BP 13496
EP 13501
DI 10.1073/pnas.1509203112
ID 46233
ER

EF