Silica fluxes in the northeast Atlantic frontal zone of Mode Water formation (38°-45°N, 16°-22°W) in 2001-2002

Julie Mosseri, Bernard Quéguiner, Peggy Rimmelin, Nathalie Leblond, Cecile Guieu

    Research output: Contribution to journalArticle

    Abstract

    The biogenic (BSi) and lithogenic (LSi) silica export fluxes were investigated in the northeast Atlantic (38°-45°N, 16°-22°W) as part of the Programme Ocean Multidisciplinaire Méso Echelle (POMME) program in 2001-2002. They were measured at four stations located on both sides of a frontal zone (40°-42°N) by means of permanent moorings of sediment traps deployed at 400 and 1000 m depth. Averaged over the area, the annual BSi fluxes (corrected from 230Th trapping efficiencies) ranged between 0.240 mmol m -2 d-1 at 400 m to 0.316 mmol m-2 d-1 at 1000 m. The bulk annual BSi fluxes are comparable to bulk BSi export fluxes recorded for oligotrophic areas. The annual export flux of LSi (range 0.029 mmol m-2 d-1 at 400 in to 0.054 mmol m-2 d-1 at 1000 m) was lower than BSi and accounted for 10% of the total silica export flux. Results show a strong coupling between the two siliceous particulate fractions, which is interpreted as reflecting LSi scavenging by BSi and limitation of BSi production in surface water by lithogenic (trace metals) inputs. BSi export was maximum at the beginning of the productive season during the spring bloom. However, annual BSi export fluxes in 2001 were quite higher at 400 m in the southern area (e.g., 0.249-0.288 at the southeast station versus 0.211 mmol BSi m-2 d-1 at the northeast station) contradictory to the classical south-north surface production increase. We suggest an advective lateral transport within the upper 400 m of siliceous particles from the northern, more productive area to the southern region.

    Original languageEnglish (US)
    Pages (from-to)1-17
    Number of pages17
    JournalJournal of Geophysical Research C: Oceans
    Volume110
    Issue number7
    DOIs
    StatePublished - Jul 8 2005

    Fingerprint

    mode water
    Silicon Dioxide
    silica
    Fluxes
    silicon dioxide
    Water
    water
    stations
    Sediment traps
    mooring
    sediment trap
    Mooring
    Scavenging
    scavenging
    trace metal
    trapping
    trace elements
    surface water
    Surface waters
    particulates

    ASJC Scopus subject areas

    • Geophysics
    • Forestry
    • Oceanography
    • Aquatic Science
    • Ecology
    • Water Science and Technology
    • Soil Science
    • Geochemistry and Petrology
    • Earth-Surface Processes
    • Atmospheric Science
    • Earth and Planetary Sciences (miscellaneous)
    • Space and Planetary Science
    • Palaeontology

    Cite this

    Silica fluxes in the northeast Atlantic frontal zone of Mode Water formation (38°-45°N, 16°-22°W) in 2001-2002. / Mosseri, Julie; Quéguiner, Bernard; Rimmelin, Peggy; Leblond, Nathalie; Guieu, Cecile.

    In: Journal of Geophysical Research C: Oceans, Vol. 110, No. 7, 08.07.2005, p. 1-17.

    Research output: Contribution to journalArticle

    Mosseri, Julie ; Quéguiner, Bernard ; Rimmelin, Peggy ; Leblond, Nathalie ; Guieu, Cecile. / Silica fluxes in the northeast Atlantic frontal zone of Mode Water formation (38°-45°N, 16°-22°W) in 2001-2002. In: Journal of Geophysical Research C: Oceans. 2005 ; Vol. 110, No. 7. pp. 1-17.
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    abstract = "The biogenic (BSi) and lithogenic (LSi) silica export fluxes were investigated in the northeast Atlantic (38°-45°N, 16°-22°W) as part of the Programme Ocean Multidisciplinaire M{\'e}so Echelle (POMME) program in 2001-2002. They were measured at four stations located on both sides of a frontal zone (40°-42°N) by means of permanent moorings of sediment traps deployed at 400 and 1000 m depth. Averaged over the area, the annual BSi fluxes (corrected from 230Th trapping efficiencies) ranged between 0.240 mmol m -2 d-1 at 400 m to 0.316 mmol m-2 d-1 at 1000 m. The bulk annual BSi fluxes are comparable to bulk BSi export fluxes recorded for oligotrophic areas. The annual export flux of LSi (range 0.029 mmol m-2 d-1 at 400 in to 0.054 mmol m-2 d-1 at 1000 m) was lower than BSi and accounted for 10{\%} of the total silica export flux. Results show a strong coupling between the two siliceous particulate fractions, which is interpreted as reflecting LSi scavenging by BSi and limitation of BSi production in surface water by lithogenic (trace metals) inputs. BSi export was maximum at the beginning of the productive season during the spring bloom. However, annual BSi export fluxes in 2001 were quite higher at 400 m in the southern area (e.g., 0.249-0.288 at the southeast station versus 0.211 mmol BSi m-2 d-1 at the northeast station) contradictory to the classical south-north surface production increase. We suggest an advective lateral transport within the upper 400 m of siliceous particles from the northern, more productive area to the southern region.",
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