A mesocosm experiment coupled with optical measurements to assess the fate and sinking of atmospheric particles in clear oligotrophic waters

Matthieu Bressac, Cecile Guieu, David Doxaran, François Bourrin, Grigor Obolensky, Jean Michel Grisoni

    Research output: Contribution to journalArticle

    Abstract

    It has recently been postulated that lithogenic particles such as Saharan dust strongly influence particulate organic carbon export to the deep ocean by acting as mineral ballast. However, our understanding of the processes involved remains scant. In the present study, optical measurements were performed to monitor variations in the concentration, composition and size distribution of particles in suspension within the water column after simulating a Saharan dust event in very clear Mediterranean waters off Corsica in June 2010. A new methodology set up in large mesocosms proved very successful in this regard. Values obtained simultaneously from three instruments (WetLabs ECO-BB3, WetLabs ac-9, Sequoia Scientific LISST-100) provided evidence that (1) part of the Saharan dust pool has a rapid settling velocity (~24-86 m day -1), (2) particulate export following a dust event is a nonlinear multi-step process and (3) export is controlled in part by the formation of organic-mineral aggregates. This experimental study provides the first insight of the complex export processes occurring after a dust event involving both physical and biogeochemical forcings in clear oligotrophic waters.

    Original languageEnglish (US)
    Pages (from-to)153-164
    Number of pages12
    JournalGeo-Marine Letters
    Volume32
    Issue number2
    DOIs
    StatePublished - Apr 1 2012

    Fingerprint

    atmospheric particle
    mesocosm
    Dust
    dust
    Water
    experiment
    Experiments
    Organic minerals
    water
    Mediterranean Water
    settling velocity
    particulate organic carbon
    mineral
    Organic carbon
    Particles (particulate matter)
    Minerals
    experimental study
    water column
    methodology
    ocean

    ASJC Scopus subject areas

    • Earth and Planetary Sciences (miscellaneous)
    • Oceanography
    • Geotechnical Engineering and Engineering Geology
    • Environmental Science (miscellaneous)

    Cite this

    A mesocosm experiment coupled with optical measurements to assess the fate and sinking of atmospheric particles in clear oligotrophic waters. / Bressac, Matthieu; Guieu, Cecile; Doxaran, David; Bourrin, François; Obolensky, Grigor; Grisoni, Jean Michel.

    In: Geo-Marine Letters, Vol. 32, No. 2, 01.04.2012, p. 153-164.

    Research output: Contribution to journalArticle

    Bressac, Matthieu ; Guieu, Cecile ; Doxaran, David ; Bourrin, François ; Obolensky, Grigor ; Grisoni, Jean Michel. / A mesocosm experiment coupled with optical measurements to assess the fate and sinking of atmospheric particles in clear oligotrophic waters. In: Geo-Marine Letters. 2012 ; Vol. 32, No. 2. pp. 153-164.
    @article{b02df329854144a0b64bff15fc70da61,
    title = "A mesocosm experiment coupled with optical measurements to assess the fate and sinking of atmospheric particles in clear oligotrophic waters",
    abstract = "It has recently been postulated that lithogenic particles such as Saharan dust strongly influence particulate organic carbon export to the deep ocean by acting as mineral ballast. However, our understanding of the processes involved remains scant. In the present study, optical measurements were performed to monitor variations in the concentration, composition and size distribution of particles in suspension within the water column after simulating a Saharan dust event in very clear Mediterranean waters off Corsica in June 2010. A new methodology set up in large mesocosms proved very successful in this regard. Values obtained simultaneously from three instruments (WetLabs ECO-BB3, WetLabs ac-9, Sequoia Scientific LISST-100) provided evidence that (1) part of the Saharan dust pool has a rapid settling velocity (~24-86 m day -1), (2) particulate export following a dust event is a nonlinear multi-step process and (3) export is controlled in part by the formation of organic-mineral aggregates. This experimental study provides the first insight of the complex export processes occurring after a dust event involving both physical and biogeochemical forcings in clear oligotrophic waters.",
    author = "Matthieu Bressac and Cecile Guieu and David Doxaran and Fran{\cc}ois Bourrin and Grigor Obolensky and Grisoni, {Jean Michel}",
    year = "2012",
    month = "4",
    day = "1",
    doi = "10.1007/s00367-011-0269-4",
    language = "English (US)",
    volume = "32",
    pages = "153--164",
    journal = "Geo-Marine Letters",
    issn = "0276-0460",
    publisher = "Springer Verlag",
    number = "2",

    }

    TY - JOUR

    T1 - A mesocosm experiment coupled with optical measurements to assess the fate and sinking of atmospheric particles in clear oligotrophic waters

    AU - Bressac, Matthieu

    AU - Guieu, Cecile

    AU - Doxaran, David

    AU - Bourrin, François

    AU - Obolensky, Grigor

    AU - Grisoni, Jean Michel

    PY - 2012/4/1

    Y1 - 2012/4/1

    N2 - It has recently been postulated that lithogenic particles such as Saharan dust strongly influence particulate organic carbon export to the deep ocean by acting as mineral ballast. However, our understanding of the processes involved remains scant. In the present study, optical measurements were performed to monitor variations in the concentration, composition and size distribution of particles in suspension within the water column after simulating a Saharan dust event in very clear Mediterranean waters off Corsica in June 2010. A new methodology set up in large mesocosms proved very successful in this regard. Values obtained simultaneously from three instruments (WetLabs ECO-BB3, WetLabs ac-9, Sequoia Scientific LISST-100) provided evidence that (1) part of the Saharan dust pool has a rapid settling velocity (~24-86 m day -1), (2) particulate export following a dust event is a nonlinear multi-step process and (3) export is controlled in part by the formation of organic-mineral aggregates. This experimental study provides the first insight of the complex export processes occurring after a dust event involving both physical and biogeochemical forcings in clear oligotrophic waters.

    AB - It has recently been postulated that lithogenic particles such as Saharan dust strongly influence particulate organic carbon export to the deep ocean by acting as mineral ballast. However, our understanding of the processes involved remains scant. In the present study, optical measurements were performed to monitor variations in the concentration, composition and size distribution of particles in suspension within the water column after simulating a Saharan dust event in very clear Mediterranean waters off Corsica in June 2010. A new methodology set up in large mesocosms proved very successful in this regard. Values obtained simultaneously from three instruments (WetLabs ECO-BB3, WetLabs ac-9, Sequoia Scientific LISST-100) provided evidence that (1) part of the Saharan dust pool has a rapid settling velocity (~24-86 m day -1), (2) particulate export following a dust event is a nonlinear multi-step process and (3) export is controlled in part by the formation of organic-mineral aggregates. This experimental study provides the first insight of the complex export processes occurring after a dust event involving both physical and biogeochemical forcings in clear oligotrophic waters.

    UR - http://www.scopus.com/inward/record.url?scp=84859099862&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84859099862&partnerID=8YFLogxK

    U2 - 10.1007/s00367-011-0269-4

    DO - 10.1007/s00367-011-0269-4

    M3 - Article

    VL - 32

    SP - 153

    EP - 164

    JO - Geo-Marine Letters

    JF - Geo-Marine Letters

    SN - 0276-0460

    IS - 2

    ER -