FN Archimer Export Format
PT J
TI Evidence of silicic acid leakage to the tropical Atlantic via Antarctic Intermediate Water during Marine Isotope Stage 4
BT 
AF GRIFFITHS, James D.
   BARKER, Stephen
   HENDRY, Katharine R.
   THORNALLEY, David J. R.
   VAN DE FLIERDT, Tina
   HALL, Ian R.
   ANDERSON, Robert F.
AS 1:1;2:1;3:2;4:1;5:3;6:1;7:4;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3AT, S Glam, Wales.
   Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA.
   Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London, England.
   Lamont Doherty Earth Observ, Palisades, NY USA.
C2 UNIV CARDIFF, UK
   WHOI, USA
   UNIV COLL LONDON, UK
   LDEO, USA
IF 3.918
TC 19
UR https://archimer.ifremer.fr/doc/00264/37526/35763.pdf
LA English
DT Article
CR IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
BO Marion Dufresne
DE ;silica leakage;diatom;carbon dioxide;SAMW;AAIW
AB Antarctic Intermediate Water (AAIW) and Subantarctic Mode Water (SAMW) are the main conduits for the supply of dissolved silicon (silicic acid) from the deep Southern Ocean (SO) to the low-latitude surface ocean and therefore have an important control on low-latitude diatom productivity. Enhanced supply of silicic acid by AAIW (and SAMW) during glacial periods may have enabled tropical diatoms to outcompete carbonate-producing phytoplankton, decreasing the relative export of inorganic to organic carbon to the deep ocean and lowering atmospheric pCO(2). This mechanism is known as the silicic acid leakage hypothesis (SALH). Here we present records of neodymium and silicon isotopes from the western tropical Atlantic that provide the first direct evidence of increased silicic acid leakage from the Southern Ocean to the tropical Atlantic within AAIW during glacial Marine Isotope Stage 4 (similar to 60-70ka). This leakage was approximately coeval with enhanced diatom export in the NW Atlantic and across the eastern equatorial Atlantic and provides support for the SALH as a contributor to CO2 drawdown during full glacial development.
PY 2013
PD JUL
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 28
IS 2
UT 000322013900009
BP 307
EP 318
DI 10.1002/palo.20030
ID 37526
ER

EF