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| Aumont, Olivier; Belviso, Sauveur; Monfray, Patrick. |
| [1] A global model for surface dimethylsulfide (DMS) and particulate dimethylsulfoniopropionate (DMSP) (pDMS) distributions is presented. The main goals of this work were to be able to predict the regional distribution of the air-sea fluxes of DMS and to predict eventually their future evolution with climate change. Diagnostic relationships have been established from data sets obtained during the ALBATROSS and EUMELI cruises carried out in the Atlantic Ocean. These equations nonlinearly relate DMS and pDMSP concentrations to chlorophyll concentrations and to the trophic status of surface waters. This model has been embedded in the global ocean carbon cycle model Institut Pierre et Simon Laplace-Ocean Carbon Cycle Model version 2 (ISPL-OCCM2), a simple... |
| Tipo: Text |
Palavras-chave: Ocean; Biogeochemistry; Ecosystem modeling; DMS; Global. |
| Ano: 2002 |
URL: https://archimer.ifremer.fr/doc/00223/33448/31824.pdf |
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| Cozic, Amandine. |
| A sensitive, precise and rapid analytical method was elaborated to measure simultaneously 5 volatile reduced sulfur compounds (VRSC) ; hydrogen sulfide (H2S), carbonyl sulfide (OCS), methane thiol (MeSH), dimethyl sulfide (DMS), dimethyl disulfide (DMDS). The study of VRSC in the Bay of Quiberon highlights seasonal and interannual variations of concentrations in epibenthic zone. H2S analyzed near the sediment water interface (anoxic microzones), is more elevated in summer. The OCS distribution is consistent with a predominant photodegradation in winter and a sedimentary source in summer. The variations of MeSH, DMS and DMDS are correlated with the Dinophyceae abundance. In the Seine estuary, the absence of volatile H2S in the up estuary is explained by the... |
| Tipo: Text |
Palavras-chave: Phytoplankton; Metal speciation; DMS; Sulfur; Phytoplancton; Spéciation métallique; DMS; Soufre. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/these-2687.pdf |
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| Corn, M; Belviso, S; Nival, P; Vigot, A; Buatmenard, P. |
| We report results from free-drifting sediment trap deployments at 200 m depth which enable measurement of the diel variations in the downward flux of detrital particulate dimethylsulphoniopropionate (DMSPp) over periods of 24-72 hours in three contrasting trophic regimes of the tropical northeastern Atlantic Ocean off Mauritania. The source of DMSPp was the phytoplankton living in surficial water layers. The three regimes exhibited similar strong diel cycles, the nocturnal fluxes being up to 100-fold lower than the daytime fluxes. High (or low) detrital DMSPp, fluxes were associated with high (or low) numbers of pteropods trapped inside the sampling cups. Thus, contamination of sinking material is likely to have occurred, promoting an overestimate of the... |
| Tipo: Text |
Palavras-chave: SULFUR; DMS; DMSP; ZOOPLANKTON; SEDIMENTATION. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00098/20886/18500.pdf |
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| Goddijn-murphy, Lonneke; Woolf, David; Chapron, Bertrand; Queffeulou, Pierre. |
| Air-sea gas exchange is affected by sea surface roughness and a previous study shows a significant relation between Ku-band backscattering from satellite altimeters and field estimates of gas transfer velocity, K. Recently C-band backscatter data were made available for altimeters on board the JASON-1 and JASON-2 satellites. In this paper we used experimental data from the same cruises to show that using the difference between the Ku-band and C-band signals to estimate sea surface roughness, and thus reducing the contribution from longer waves, improved the K estimates. This is consistent with the theory that gas transfer is largely controlled by short capillary-gravity waves. For satellite data closer than 2 hr and 0.5 degrees from the K sample stations,... |
| Tipo: Text |
Palavras-chave: Air-sea gas transfer; Satellite altimetry; DMS. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00174/28564/26980.pdf |
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| Nogueira,Ú.T.; Maurício,R.M.; Gonçalves,L.C.; Pereira,L.G.R.. |
| Estimou-se a degradação da matéria seca (DMS) via produção de gases (PG) por meio de equações. Foram agrupados dados de volume de gases e DMS de oito forrageiras (Brachiaria brizantha, Brachiaria decumbens, feno de Cynodon spp, silagem de milho, silagem de milheto, sorgo de corte, capim-elefante e cana-de-açúcar) e de milho em grão. Os dados de DMS obtidos em laboratório foram comparados à DMS obtida pelas equações de regressão. Apesar dos altos coeficientes de determinação, os resultados demonstraram a impossibilidade de estimar a DMS via PG pelas equações geral, de dois e de três pontos. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: In vitro; Predição; Gases; Fibra; DMS. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352006000500028 |
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| Cailliau, C; Belviso, S; Goutx, M; Bedo, A; Park, Y; Charriaud, E. |
| During summer 1994, the production regime at 2 sites located in the Indian sector of the Southern Ocean, one in the Permanent Open Ocean Zone (POOZ) at 52 degrees S, and a second in the Seasonal Ice Zone (SIZ) at 63 degrees S, was dominated by regeneration (0.3 < f-ratio < 0.4). Two time series, each of about 4 d, were performed over pre-determined time intervals of 4 h using a free-floating sediment trap set at 200 m at the 2 sites. Hourly variations of C, N, chlorophyll a (chl a) and its degradation products, taxon-specific pigments, lipid classes and dimethylsulfoniopropionate (DMSP) were measured simultaneously. Measurements in the water column were done during the sediment trap drifting. Fucoxanthin, a typical diatom pigment, was the major... |
| Tipo: Text |
Palavras-chave: Antarctic; Austral ocean; Sediment traps; Diel cycles; Phytoplankton; Pigments; Lipids; DMSP; DMS. |
| Ano: 1999 |
URL: https://archimer.ifremer.fr/doc/00240/35083/33651.pdf |
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