FN Archimer Export Format
PT J
TI A benthic Si mass balance on the Congo margin: Origin of the 4000 m DSi anomaly and implications for the transfer of Si from land to ocean
BT 
AF RAGUENEAU, O.
   REGAUDIE-DE-GIOUX, A.
   MORICEAU, B.
   GALLINARI, M.
   VANGRIESHEIM, Annick
   BAURAND, F.
   KHRIPOUNOFF, Alexis
AS 1:1;2:1;3:1;4:1;5:2;6:2;7:2;
FF 1:;2:;3:;4:;5:PDG-DOP-DCB-EEP-LEP;6:;7:PDG-DOP-DCB-EEP-LEP;
C1 Inst Univ Europeen Mer, CNRS, UMR 6539, F-29280 Plouzane, France.
   IFREMER, Ctr Brest, Dep DEEP LEP, F-29280 Plouzane, France.
C2 UBO, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-DOP-DCB-EEP-LEP
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 1.965
TC 24
TU Centre national de la recherche scientifique
   Institut de recherche pour le développement
   Institut français de recherche pour l'exploitation de la mer
   Université de Bretagne Occidentale
UR https://archimer.ifremer.fr/doc/2009/publication-7410.pdf
LA English
DT Article
CR BIOZAIRE 3
   EQUALANT 2000
BO Anchored Buoy
   Thalassa
DE ;Congo;Continental margin;Preservation;Dissolution;Biogenic silica
AB To elucidate the origin of the silicic acid (DSi) anomaly observed along the 4000 isobath on the Congo margin, we have established a benthic Si mass balance and performed direct measurements of biogenic silica (bSiO(2)) dissolution in the deep waters and in the sediments. Results strongly suggest that the anomaly originates from the sediments; the intensity of DSi recycling is consistent with the degradation of organic matter, as observed from Si:O-2 ratios in the benthic fluxes compared to that ratio observed in the anomalies. Strong imbalances, observed in both the Si and C mass balances, suggest that the biogenic matter that degrades and dissolves in these sediments near 4000 m does not come from pelagic sedimentation. It is probably not coming also from the deep channel, because observations were similar in the deep channel vicinity (site D) and further south, far from its influence (site C). The composition of the sediments, with an Si:C ratio close to that observed on continental shelves, suggests that this matter is coming from downslope transport. A first estimate of the magnitude of this flux at global scale, close to 12 T mol Si yr(-1), suggests that it may be an important path for transferring Si from land to ocean.
PY 2009
PD NOV
SO Deep Sea Research Part II: Topical Studies in Oceanography
SN 0967-0645
PU Elsevier
VL 56
IS 23
UT 000272366000005
BP 2197
EP 2207
DI 10.1016/j.dsr2.2009.04.003
ID 7410
ER

EF