FN Archimer Export Format
PT J
TI Relevance of silicon isotopes to Si-nutrient utilization and Si-source assessment in Antarctic
BT 
AF CARDINAL, D
   ALLEMAN, LY
   DEHAIRS, F
   SAVOYE, N
   TRULL, TW
   ANDRE, L
AS 1:1;2:1;3:2;4:2;5:3;6:1;
FF 1:;2:;3:;4:;5:;6:;
C1 Musee Royal Afr Cent, Dept Geol & Mineral, B-3080 Tervuren, Belgium.
   Univ Libre Brussels, Dept Analyt & Environm Chem, B-1050 Brussels, Belgium.
   Univ Tasmania, CSIRO Marine Res, Antarctic Climate & Ecosyst Cooperat Res Ctr, Hobart, Tas 7001, Australia.
C2 MUSEE ROYAL AFR CENT, BELGIUM
   ULB, BELGIUM
   UNIV TASMANIA, AUSTRALIA
IF 3.373
TC 117
UR https://archimer.ifremer.fr/doc/00233/34424/32838.pdf
LA English
DT Article
CR SURVOSTRAL 2000/2001
   SURVOSTRAL 2001/2002
   SURVOSTRAL 2002/2003
   SURVOSTRAL 2003/2004
   SURVOSTRAL 92
   SURVOSTRAL 93
   SURVOSTRAL 94
   SURVOSTRAL 95
   SURVOSTRAL 96
   SURVOSTRAL 97
   SURVOSTRAL 98
   SURVOSTRAL 99
BO L'Astrolabe
DE ;δ29Si;δ30Si;diatoms;spring Southern Ocean;fractionation factor
AB We analyzed delta(29) Si of dissolved silicate for eight water column profiles across the Southern Ocean ( south of Australia in spring 2001) from the Seasonal Ice Zone (SIZ) north to the Subantarctic Zone (SAZ), including the first isotopic compositions measured for Si-depleted seawaters. All profiles display mixed layer enrichments in heavy Si isotopes relative to deep water in accordance with preferential uptake of the light isotope by diatoms. As silicate levels decrease from the SIZ northward across the Polar Front Zone (PFZ) to the SAZ, surface and mesopelagic delta(29) Si signatures generally become progressively heavier, but the most Si-depleted SAZ waters do not exhibit delta(29) Si values heavier than in the PFZ. This intricacy appears to derive from variations in the vertical and horizontal supply of silicate to surface waters, and by applying a steady state open system model, we estimate a fractionation factor, (29)epsilon, between diatoms and seawater of -0.45 +/- 0.17%, independently of zones and phytoplankton community. Though encouraging, these results are related to latitudinal changes in mesopelagic delta(29) Si values, complexity in surface silicate - delta(29) Si correlations, and differences from previous studies, which underline the need for caution in the use of silicon isotopes in paleoceanographic studies until systematic efforts have been undertaken to better understand modern variations.
PY 2005
PD APR
SO Global Biogeochemical Cycles
SN 0886-6236
PU Amer Geophysical Union
VL 19
IS 2/GB2007
UT 000228480300002
BP 1
EP 13
DI 10.1029/2004GB002364
ID 34424
ER

EF