FN Archimer Export Format
PT J
TI Alternating Influence of Northern Versus Southern-Sourced Water Masses on the Equatorial Pacific Subthermocline During the Past 240 ka
BT 
AF RIPPERT, Nadine
   MAX, Lars
   MACKENSEN, Andreas
   CACHO, Isabel
   POVEA, Patricia
   TIEDEMANN, Ralf
AS 1:1;2:1;3:1;4:2;5:2;6:1;
FF 1:;2:;3:;4:;5:;6:;
C1 Alfred Wegener Inst, Helmholtz Zentrum Polar & Meeresforsch, Bremerhaven, Germany.
   Univ Barcelona, Dept Dinam Terra & Ocea, Grp Recerca Consolidat Geociencies Marines, Barcelona, Spain.
C2 INST A WEGENER, GERMANY
   UNIV BARCELONA, SPAIN
IF 2.718
TC 22
UR https://archimer.ifremer.fr/doc/00497/60825/64592.pdf
   https://archimer.ifremer.fr/doc/00497/60825/64593.pdf
   https://archimer.ifremer.fr/doc/00497/60825/64594.xls
   https://archimer.ifremer.fr/doc/00497/60825/64595.xls
LA English
DT Article
CR IMAGES 3-IPHIS-MD106
   MD 152 / MATACORE
BO Marion Dufresne
AB The eastern equatorial Pacific (EEP) is a key area to understand past oceanic processes that control atmospheric CO2 concentrations. Many studies argue for higher nutrient concentrations by enhanced nutrient transfer via Southern Ocean Intermediate Water (SOIW) to the low-latitude Pacific during glacials. Recent studies, however, argue against SOIW as the primary nutrient source, at least during early Marine Isotope Stage 2 (MIS 2), as proxy data indicate that nutrients are better utilized in the Southern Ocean under glacial conditions. New results from the subarctic Pacific suggest that enhanced convection of nutrient-rich Glacial North Pacific Intermediate Water (GNPIW) contributes to changes in nutrient concentrations in equatorial subthermocline water masses during MIS 2. However, the interplay between SOIW versus GNPIW and its influence on the nutrient distribution in the EEP spanning more than one glacial cycle are still not understood. We present a carbon isotope (delta C-13) record of subthermocline waters derived from deep-dwelling planktonic foraminifera Globorotaloides hexagonus in the EEP, which is compared with published delta C-13 records around the Pacific. Results indicate enhanced influence of GNPIW during MIS 6 and MIS 2 compared to today with largest contributions of northern-sourced intermediate waters during glacial maxima. These observations suggest a mechanistic link between relative contributions of northern and southern intermediate waters and past EEP nutrient concentrations. A switch from increased GNPIW (decreased SOIW) to diminished GNPIW (enhanced SOIW) influence on equatorial subthermocline waters is recognized during glacial terminations and marks changes to modern-like conditions in nutrient concentrations and biological productivity in the EEP. 
PY 2017
PD NOV
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 32
IS 11
UT 000418169800011
BP 1256
EP 1274
DI 10.1002/2017PA003133
ID 60825
ER

EF