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Analytical and Environmental
Chemistry - Vrije Universiteit Brussel (ANCH-VUB)
Frank Dehairs, Nicolas Savoye, Stéphanie Jacquet, Anne Julie Cavagna
- KEOPS
- Antarctic
- January – February 2005
- Polar Zone: Kerguelen Plateau, Indian Ocean sector
- Title: Export of organic carbon in a region naturally fertilised
with Fe
- Summary: KEOPS (Kerguelen compared study of Ocean and Plateau
in surface water) is a project related to the French programme
PROOF PROcessus biogéochimiques dans l'Océan
et Flux) of INSU (Institut National des Sciences de l'Univers).
KEOPS aims at improving our knowledge of the biogeochemical
cycles in the Southern Ocean. Mainly based on process studies
it will contribute to a better understanding and prediction
of the response of this large High Nutrient Low Chlorophyll
area to global climatic change. Particularly KEOPS studies
the effect of natural iron fertilisation of the ocean by the
Kerguelen plateau, on the biological pump of CO2 and on the
cycles of other chemical compounds relevant for climate. A
multidisciplinary approach is applied, coupling physics and
biogeochemistry. Our contribution focused on the (i) assessment
of the carbon export flux applying the 234Th-deficit and method,
(ii) the assessment of organic carbon mineralisation in subsurface
waters via the Ba-barite proxy.
- Vessel: Marion Dufresne
Belgian projects
Title : Export production and mesopelagic remineralization in iron-contrasted areas of the Kerguelen plateau
Summary :
The overall goal of this work is to assess the
export of organic carbon and associated biogenic elements (N,
Si, Fe) from the upper mixed layer to mesopelagic water as well
as the underway remineralization of the exported organic matter.
It contributes to the KEOPS Project Objective 2.2. Two approaches
are combined: 1) the measurement of 234Th deficit with respect
to 238U and its conversion into 234Th, then POC, PON, BSi fluxes
and 2) the measurement of particulate biogenic barium and its
conversion into remineralized carbon. Furthermore, silicon stable
isotopes of silicic acid and of size fractionated particles will
be studied sampled in order to better constrain the Si cycle
in the Kerguelen plateau area.
Participants : Nicolas
Savoye, Stéphanie
Jacquet
Complementary
resources :
www.obs-vlfr.fr/proof/vt/op/ec/keops/keo_plan.htm
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