FN Archimer Export Format
PT J
TI Deep water variability on the southern Agulhas Plateau: Interhemispheric links over the past 170 ka
BT 
AF MOLYNEUX, Elizabeth G.
   HALL, Ian R.
   ZAHN, Rainer
   DIZ, Paula
AS 1:1;2:1;3:2;4:1;
FF 1:;2:;3:;4:;
C1 Cardiff Univ, Sch Earth Ocean & Planetary Sci, Cardiff CF10 3YE, Wales.
   Autonomous Univ Barcelona, Inst Catalana Rec & Estudis Avancats, Inst Ciencia & Tecnol Ambientals, E-08193 Barcelona, Spain.
C2 UNIV CARDIFF, UK
   UNIV AUTONOMOUS BARCELONA, SPAIN
IF 3.391
TC 21
UR https://archimer.ifremer.fr/doc/00233/34459/32867.pdf
LA English
DT Article
CR IMAGES 1-MD101
   IMAGES 3-IPHIS-MD106
   MD 128 / SWAF
BO Marion Dufresne
DE ;benthic isotopes;sortable silt mean grain size;North Atlantic Deep Water
AB Sortable silt mean grain sizes together with oxygen and carbon isotopic data produced on the benthic foraminiferal species Fontbotia wuellerstorfi are used to construct high-resolution records of near-bottom flow vigour and deep water ventilation at a core site MD02-2589 located at 2660 m water depth on the southern Agulhas Plateau. The results suggest that during glacial periods ( marine oxygen isotope stages 2 and 6, MIS 2 and MIS 6, respectively), there was a persistent contribution of a well-ventilated water mass within the Atlantic to Indian oceanic gateway with a delta(13)C signature similar to present-day Northern Component Water (NCW), e. g., North Atlantic Deep Water (NADW). The records of chemical ventilation and near-bottom flow vigor reflect changes in the advection of northern source waters and meridional variability in the location of the Antarctic Circumpolar Current and its associated fronts. We suggest that during Termination II (TII), changes in chemical ventilation are largely decoupled from near-bottom physical flow speeds. A mid-TII climate optimum is associated with a low-flow speed plateau concurrent with a period of increased ventilation shown in the benthic delta(13)C of other Southern Ocean records but not in our benthic delta(13)C of MD02-2589. The climate optimum is followed by a period of southern cooling around 128 ka coincident with a stronger influence of NCW to interglacial levels at around 124 ka. All proxy records show a near synchronous and rapid shift during the transition from MIS 5a-4 (73 ka). This large event is attributed to a rapid decrease in NADW influence and replacement over the Agulhas Plateau by southern source waters.
PY 2007
PD NOV
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 22
IS 4/PA4209
UT 000251063100001
BP 1
EP 14
DI 10.1029/2006PA001407
ID 34459
ER

EF