References of "Theate, Jean-Marie"
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See detailAtmospheric CO2 flux from mangrove surrounding waters
Borges, Alberto ULg; Djenidi, Salim ULg; Lacroix, Geneviève et al

in Geophysical Research Letters (2003), 30(11),

[1] The partial pressure of CO2 (pCO(2)) was measured at daily and weekly time scales in the waters surrounding mangrove forests in Papua New Guinea, the Bahamas and India. The pCO(2) values range from ... [more ▼]

[1] The partial pressure of CO2 (pCO(2)) was measured at daily and weekly time scales in the waters surrounding mangrove forests in Papua New Guinea, the Bahamas and India. The pCO(2) values range from 380 to 4800 muatm. These data, together with previously published data, suggest that overall oversaturation of CO2 with respect to atmospheric equilibrium in surface waters is a general feature of mangrove forests, though the entire ecosystems (sediment, water and vegetation) are probably sinks for atmospheric CO2. The computed CO2 fluxes converge to about +50 mmolC m(-2) day(-1). If this conservative value is extrapolated for worldwide mangrove ecosystems, the global emission of CO2 to the atmosphere is about 50 10(6) tC year(-1). Based on this tentative estimate, mangrove waters appear to be regionally a significant source of CO2 to the atmosphere and should be more thoroughly investigated, especially at seasonal time scale. [less ▲]

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See detailCarbon dioxide daily variations and atmospheric fluxes over the Great Bahama Bank using a novel autonomous measuring system
Frankignoulle, Michel; Biondo, Renzo ULg; Théate, Jean-Marie et al

in Caribbean Journal of Sience (2003), 39(3), 257-264

A novel autonomous measuring device that acquires the partial pressure of CO2 (pCO2) by equilibration and several other parameters is described. This device, the Floating Equilibrator System (FES) was ... [more ▼]

A novel autonomous measuring device that acquires the partial pressure of CO2 (pCO2) by equilibration and several other parameters is described. This device, the Floating Equilibrator System (FES) was tested in field conditions for the first time in the Great Bahama Bank, in December 2000. We successfully carried out two 24 h cycles in Norman’s Pond, one in front of the Caribbean Marine Research Centre (CMRC) and another one near Bock Cay. Over-saturation of CO2 with respect to atmospheric equilibrium was observed systematically at the three sites, although significantly more marked at Norman’s Pond. The higher values of pCO2 and atmospheric CO2 fluxes obtained at Norman’s Pond, than in the adjacent open waters of the Great Bahama Bank, suggest a comparatively stronger heterotrophy at Norman’s Pond. This is most likely related to the organic carbon inputs to the water column and sediments from the dense mangrove forest surrounding Norman’s Pond. The larger amplitude of pCO2 daily variations observed, during the Norman’s Pond 24 h cycles, is probably due to higher biological activity than in the adjacent open waters of the Great Bahama Bank. This is corroborated by a tentative estimation of Gross Primary Production based on simple computations. We speculate that calcification could also contribute to some extent to different amplitude of the pCO2 daily variations between the mangrove pond and the open waters of the Great Bahama Bank. [less ▲]

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See detailCarbon Dioxide Emission from European Estuaries
Frankignoulle, Michel; Abril, Gwenaël; Borges, Alberto ULg et al

in Science (1998), 282(5388), 434-6

The partial pressure of carbon dioxide (pCO2) in surface waters and related atmospheric exchanges were measured in nine European estuaries. Averaged fluxes over the entire estuaries are usually in the ... [more ▼]

The partial pressure of carbon dioxide (pCO2) in surface waters and related atmospheric exchanges were measured in nine European estuaries. Averaged fluxes over the entire estuaries are usually in the range of 0.1 to 0.5 mole of CO2 per square meter per day. For wide estuaries, net daily fluxes to the atmosphere amount to several hundred tons of carbon (up to 790 tons of carbon per day in the Scheldt estuary). European estuaries emit between 30 and 60 million tons of carbon per year to the atmosphere, representing 5 to 10% of present anthropogenic CO2 emissions for Western Europe. [less ▲]

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See detailParticle fluxes over a Mediterranean seagrass bed: a one-year sediment trap experiment
Dauby, Patrick ULg; Bale, A. J.; Bloomer, N. et al

in Marine Ecology. Progress Series (1995), 126

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See detailDynamique du carbone inorganique des eaux de surface dans l'embouchure de l'Escaut
Frankignoulle, Michel; Biondo, Renzo ULg; Bouquegneau, Jean-Marie ULg et al

in Bulletin de la Société Royale des Sciences de Liège (1994), 61

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