Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/17711
Share/Export:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Title

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

AuthorsRagueneau, O.; Regaudie de Gioux, Aurore CSIC ORCID; Moriceau, B.; Gallinari, M.; Vangriesheim, A.; Baurand, F.; Khripounoff, A.
KeywordsBiogenic silica
Dissolution
Preservation
Continental margin
Congo
Issue Date14-Apr-2009
PublisherElsevier
CitationDeep Sea Research Part II: Topical Studies in Oceanography (2009), doi: 10.1016/j.dsr2.2009.04.003 (In press)
AbstractTo 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 (bSiO2) 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:O2 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.
Description11 pages, 6 figures, 3 tables.-- Article in press.
Publisher version (URL)http://dx.doi.org/10.1016/j.dsr2.2009.04.003
URIhttp://hdl.handle.net/10261/17711
DOI10.1016/j.dsr2.2009.04.003
ISSN0967-0645
Appears in Collections:(IMEDEA) Artículos

Show full item record
Review this work

SCOPUSTM   
Citations

24
checked on May 18, 2022

WEB OF SCIENCETM
Citations

24
checked on May 22, 2022

Page view(s)

348
checked on May 24, 2022

Google ScholarTM

Check

Altmetric

Dimensions


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.