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Comments on "Shallow gas off the Rhone prodelta, Gulf of Lions" by Garcia-Garcia et al. (2006) Marine Geology 234 (215-231) - Reply ArchiMer
Garcia Garcia, A; Orange, D; Lorenson, T; Radakovitch, O; Tesi, T; Miserocchi, S; Berne, Serge; Friend, P; Nittrouer, C; Normand, Alain.
We really appreciate the interest and comments regarding our manuscript. We hope we address all the lingering issues in this reply. This also gives us the opportunity of publishing an update on our dataset that will complete the original manuscript (see Table 1). We have followed the author pattern in our answers: I-Gas sampling procedure, 2-Reported gas concentrations results, 3-General remarks, 4-Conclusions. (c) 2007 Elsevier B.V. All rights reserved.
Tipo: Text Palavras-chave: Gulf of Lions; Rhone prodelta; Flood deposits; Biogenic methane; Shallow gas.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3846.pdf
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Particulate matter and organic carbon budgets for the Gulf of Lions (NW Mediterranean) ArchiMer
Durrieu De Madron, X; Abassi, A; Heussner, S; Monaco, A; Aloisi, Jc; Radakovitch, O; Giresse, P; Buscail, R; Kerherve, P.
An analysis of sedimentological, sediment trap and hydrological data was performed to investigate the transport and fate of particulate matter in the Gulf of Lions. The sedimentological properties outline the major sedimentary units of the shelf (Rhone prodelta, mid-shelf mud belt, outer shelf) and slope. The geometry of these sedimentary units and the southwestwards increase of particulate fluxes on the slope highlight the influence of the general cyclonic circulation on the dispersion of land-derived particulate matter. Considering the known input and output terms, budgets of particulate matter and organic carbon in the Gulf of Lions are proposed. Inputs were river supply, atmospheric deposition and primary production; outputs were sediment burial and...
Tipo: Text Palavras-chave: Méditerranée; Golfe du Lion; Sédiment; Flux; Bilans de masse et de carbone organique; Mediterranean Sea; Gulf of Lions; Sediment; Flux; Organic carbon and mass budgets.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00301/41210/40366.pdf
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Radionuclide deposition in the Rhone River Prodelta (NW Mediterranean sea) in response to the December 2003 extreme flood ArchiMer
Miralles, Jérôme; Arnaud, M; Radakovitch, O; Marion, C; Cagnat, X.
The extreme Rhone River flood that peaked in early December 2003 with water discharges as high as 11,500 m(3) s(-1), induced major damage in southern France and transferred large amounts of radionuclides that were associated with suspended particulate matter such as Be-7, Cs-137 and Pb-210. Specific marine locations in the close vicinity of the Rhone River Mouth were sampled three times in December 2003, February 2004 and April 2004 in order to quantify the consequences of flood events in the Rhone River Prodelta and to investigate the sedimentary depositional patterns through time. The Pb-210(xs) profile analyses in sediment revealed the existence of two particulate matter inputs, one that was related to the December extreme flood and the other to a peak...
Tipo: Text Palavras-chave: Gulf of Lions; Rhone River Prodelta; Extreme flood; Radionuclide deposition.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2273.pdf
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Unusual Po-210/Pb-210 ratios in the surface water of the Gulf of Lions ArchiMer
Radakovitch, O; Cherry, Rd; Heyraud, M; Heussner, S.
Concentrations of Po-210 and Pb-210 have been measured in sea water collected in the Grand Rhone Canyon. Concentrations of Pb-210 are at similar levels to those found in other Mediterranean seawater samples, and are at the levels which would be expected in comparison with global sea water data. The same applies to the Po-210 concentrations in samples from below 100 m depth. Surface samples from above 100 m have Po-210 at levels rather higher than expected, and their Po-210/Pb-210 ratios are about 1 or more as compared with the usual open ocean ratio of about 0.5. These data can be interpreted as indicating another source of supply of Po-210 to the surface layer in addition to the normal atmospheric input. We suggest that an episodic advective particulate...
Tipo: Text Palavras-chave: Enlèvement; Mer Méditerranée; Bilan de radioélément; Temps de résidence; Scavenging; Mediterranean Sea; Radionuclide budget; Residence time.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43668/43202.pdf
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Shallow gas off the Rhone prodelta, Gulf of Lions ArchiMer
Garcia Garcia, Ana; Orange, D; Lorenson, T; Radakovitch, O; Tesi, T.; Miserocchi, S; Berne, Serge; Friend, P.l.; Nittrouer, C; Normand, Alain.
Sediment cores acquired in 2004 off the Rhone prodelta show consistent anomalous methane concentrations of up to 87,440 ppm. Methane compositional and isotopic data support a biogenic origin, although there are a few sites that show strongly depleted delta C-13 values (-53%o PDB) suggesting a mixed source for the gas (biogenic and thermogenic). Anomalous methane concentrations (samples with more than 90 ppm) are discussed and integrated with organic carbon data, sedimentary rates and ADCP profiles. Highest gas concentrations were found directly off the river mouth (20-40 m water depth) and where the IFREMER models point to the thickest accumulation (> 2 m) in response to the Rhone flood event. In areas unaffected by the high flux of organic matter and...
Tipo: Text Palavras-chave: Gulf of Lions; Rhone prodelta; Flood deposits; Biogenic methane; Shallow gas.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2396.pdf
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