FN Archimer Export Format PT J TI Middle-late Pleistocene deep water circulation in the southwest subtropical Pacific BT AF RUSSON, T. ELLIOT, M. KISSEL, C. CABIOCH, G. DE DECKKER, P. CORREGE, T. AS 1:1;2:1;3:2;4:3;5:4;6:5; FF 1:;2:;3:;4:;5:;6:; C1 Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland. CEA, CNRS UVSQ, Lab Mixte,IPSL, Lab Sci Climat & Environ, F-91198 Gif Sur Yvette, France. Inst Rech Dev, Unite Rech Paleotrop, Noumea, New Caledonia. Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia. Univ Bordeaux, CNRS, UMR 5805, F-33000 Bordeaux, France. C2 UNIV EDINBURGH, UK CEA, FRANCE IRD, FRANCE UNIV AUSTRALIAN NATL, AUSTRALIA UNIV BORDEAUX, FRANCE IF 3.644 TC 16 UR https://archimer.ifremer.fr/doc/00144/25522/23666.pdf LA English DT Article CR IMAGES 3-IPHIS-MD106 MD 153 / AUSFAIR BO Marion Dufresne AB The modern delta(13)C(DIC) distribution in southwest subtropical Pacific deep waters is consistent with a regional mixing regime between water masses of open Pacific Ocean and Tasman Sea origin. This mixing regime is reconstructed across the middle-late Pleistocene using a record of benthic foraminiferal delta(13)C in a sediment core from the New Caledonia Trough. The relative influence on the mixing regime from open Pacific Ocean deep waters is seen to be significantly reduced during glacial in comparison to interglacial stages over the past 1.1 Ma. The spatial delta(13)C gradient in the Southern Ocean between deep waters entering the Tasman Sea and the open Pacific Ocean is shown to be consequently greater during glacial than interglacial stages but was generally reduced across the period of the Middle Pleistocene Transition. The existence of strong spatial chemical gradients in the glacial Southern Ocean limits its capacity to act as an enhanced sink for atmospheric carbon. PY 2009 PD OCT SO Paleoceanography SN 0883-8305 PU Amer Geophysical Union VL 24 UT 000271320900001 DI 10.1029/2009PA001755 ID 25522 ER EF