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A coastal operational oceanography system coupled to the GMES marine service ArchiMer
Lecornu, Fabrice; Dumas, Franck; Gohin, Francis; Le Traon, Pierre-yves; Menesguen, Alain; Pineau-guillou, Lucia.
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00243/35380/33883.pdf
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A new procedure for interpolating satellite-derived Suspended Particulate Matters within the Previmer context ArchiMer
Gohin, Francis; Bryere, Philippe; Perrot, Laurie.
After several years of experience in providing daily merged products of non-algal Suspended Particulate Matters (SPM) for forcing the light in the ecological model of Previmer ECO-MARS-3D, we have often observed poor quality SPM fields in winter due to the cloud cover. For this reason we propose a new interpolation scheme, multisensor and multitemporal, based on a first-guess field of daily SPM derived from a biweekly satellite climatology modified to take into account dynamically the effects of waves and tides. The contribution of waves and tide is simulated through a simple statistical model (multiplicative effects of the significant wave heights and tidal intensity) summing up the information coming out from the historical data set of SPM. On an...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00197/30799/29168.pdf
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Analysis of surface wind and roughness length evolution with fetch using a combination of airborne lidar and radar measurements ArchiMer
Flamant, C; Pelon, J; Hauser, D; Quentin, C; Drennan, Wm; Gohin, Francis; Chapron, Bertrand; Gourrion, Jerome.
[1] Acombination of surface wind speed (SWS) and sea state variables, derived from quasi-simultaneous airborne lidar and radar measurements, made in the framework of the Flux, Etat de mer et Teledetection en Condition de fetcH variable (FETCH) experiment, is used to analyze the evolution of surface roughness length, neutral drag coefficient, and friction velocity coefficient with fetch in the first hundred kilometers offshore over the Gulf of Lion, Western Mediterranean. The study focuses on the Tramontane/ Mistral event documented in the afternoon of 24 March 1998. Particular attention is given to SWS derived from nadir lidar measurements. The SWS retrieval methodology developed and validated for open ocean conditions by Flamant et al. [1998] has been...
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Ano: 2003 URL: http://archimer.ifremer.fr/doc/00000/10174/9582.pdf
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Annual cycles of chlorophyll-a, non-algal suspended particulate matter, and turbidity observed from space and in-situ in coastal waters ArchiMer
Gohin, Francis.
Sea surface temperature, chlorophyll, and turbidity are three variables of the coastal environment commonly measured by monitoring networks. The observation networks are often based on coastal stations, which do not provide a sufficient coverage to validate the model outputs or to be used in assimilation over the continental shelf. Conversely, the products derived from satellite reflectance generally show a decreasing quality shoreward, and an assessment of the limitation of these data is required. The annual cycle, mean, and percentile 90 of the chlorophyll concentration derived from MERIS/ESA and MODIS/NASA data processed with a dedicated algorithm have been compared to in-situ observations at twenty-six selected stations from the Mediterranean Sea to...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00052/16299/13812.pdf
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Apport des images satellite à l'évaluation de la qualité des masses d'eau DCE. Analyse des données de Chlorophylle a sur la période 2011-2016 dans les masses d'eau côtière du bassin versant Loire-Bretagne ArchiMer
Bizzozero, Lucie; Gohin, Francis; Lampert, Luis; Fortune, Mireille; Cochennec-laureau, Nathalie.
Afin de répondre aux objectifs de la Directive Cadre sur l’eau, l’Ifremer met en oeuvre, en appui à l’Agence de l’eau Loire Bretagne, la surveillance de l’élément de qualité phytoplancton. Le suivi sur des points fixes et à une fréquence mensuelle ne permet pas de suivre l’ensemble des masses d’eau du bassin Loire Bretagne. C’est pourquoi l’évaluation de l’indicateur phytoplancton a été complétée par une évaluation à partir des images satellite, notamment sur les masses d’eau non suivies. L’indice biomasse (représenté par le percentile 90 de la Chl-a) a pu être calculé à partir des données satellite pour la quasi-totalité des masses d’eau côtières RCS et non RCS, c’est-à-dire 34 masses d’eau sur 39. Pour les cinq masses d’eau restantes, les limites liées à...
Tipo: Text Palavras-chave: Images satellite; Indice Biomasse; Directive Cadre sur l’eau; Chlorophylle a; Bassin Loire Bretagne; Qualité des masses d’eau; Indicateur Phytoplancton.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00453/56465/58162.pdf
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Atlas de la Température, de la concentration en Chlorophylle et de la Turbidité de surface du plateau continental français et de ses abords de l’Ouest européen ArchiMer
Gohin, Francis; Saulquin, Bertrand; Bryere, Philippe.
These climatologies have been provided to the French ministry of Ecology as a description of the initial state of the French E.E.Z. for the European Maritime Strategy Directive.
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00057/16840/14306.pdf
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Atlas mensuel des températures moyennes dans le golfe de Gascogne ArchiMer
Gohin, Francis; Langlois, G.
This study proposes a method for bathythermal analysis applied to the temperature profiles collected in the Bay of Biscay since 1950 and recorded at the French Hydrographic and Oceanographic Service of the Navy (SHOM). We consider the ocean variability, historically sampled with temperature measurements, from a geostatistical point of view. Thanks to an appropriate model of the thermal structures and using the "kriging" method, we proceed to monthly mean optimal estimations on a regular gridnet. For this purpose, we choose a random function model able to take several scales of phenomena into account. In practice, a structural analysis is first performed from the monthly files by computing the experimental variogram. Secondly, we exclude the incoherent...
Tipo: Text
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00101/21249/18892.pdf
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Bulletin d'information PREVIMER - Informations et analyses des eaux côtières. Janvier Février 2010 - n°12 ArchiMer
Lazure, Pascal; Huret, Martin; Gohin, Francis; Menesguen, Alain; Lecornu, Fabrice; Le Traon, Pierre-yves; Thomin, Pascale; Jegou, P.; Baraer, F.; Corre, Gilles; Louazel, Stephanie; Equipe projet PREVIMER.
Sommaire * Météo et débits des fleuves.....2 * Caractéristiques des masses d’eau côtières..............5 * Production biologique............11 * Rappel des objectifs du bulletin PREVIMER..................13 * Les moyens d’observations et de prévisions de l’état des mers côtières...........................13 * Glossaire..................................15
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00242/35367/33866.pdf
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Bulletin d'information PREVIMER - Informations et analyses des eaux côtières. Mars Avril 2009- n°7 ArchiMer
Lazure, Pascal; Huret, Martin; Gohin, Francis; Sourisseau, Marc; Saulquin, Bertrand; Lecornu, Fabrice; De Roeck, Yann-herve; Legrand, Jacques; Thomin, Pascale; Aoustin, Yannick; Jegou, P.; Baraer, F.; Le Stum, M.; Louazel, Stephanie; Equipe projet PREVIMER.
Sommaire * Météo, états de mer et débits des fleuves.....................2 * Caractéristiques des masses d’eau côtières..............6 * Production biologique............11 * Les faits marquants................12 * Rappel des objectifs du bulletin PREVIMER..................13 * Les moyens d’observations et de prévisions de l’état des mers côtières...........................13 * Glossaire..................................15
Tipo: Text
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00242/35360/33860.pdf
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Coccolith-derived turbidity and hydrological conditions in May in the Bay of Biscay ArchiMer
Perrot, Laurie; Gohin, Francis; Ruiz-pino, Diana; Lampert, Luis; Huret, Martin; Dessier, Aurelie; Malestroit, Pascale; Dupuy, Christine; Bourriau, Paul.
Coccolithophore blooms occur regularly from April to June in the Bay of Biscay where they have been observed for many years from ocean-colour imagery thanks to the ability of their calcite plates to scatter light. They are easily depicted on interpolated images of non-algal Suspended Particulate Matter (SPM) derived from satellite reflectance data in May, at the time of the PELGAS (PELagique GAScogne) annual surveys. Over the springs 2012 to 2015, the PELGAS surveys provided in-situ data on the turbidity throughout the water column and on the hydrological environment prevailing during the blooms in the vicinity of the continental shelf break. The satellite-derived SPM in the area of coccolithophore blooms was closely related to measured turbidity in the...
Tipo: Text Palavras-chave: Bay of Biscay; Ocean colour; Suspended particulate matter; Turbidity; Coccoliths; Stratification.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00416/52790/53689.pdf
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Construction of Multi-Year Time-Series Profiles of Suspended Particulate Inorganic Matter Concentrations Using Machine Learning Approach ArchiMer
Renosh, Pannimpullath R.; Jourdin, Frederic; Charantonis, Anastase A.; Yala, Khalil; Rivier, Aurelie; Badran, Fouad; Thiria, Sylvie; Guillou, Nicolas; Leckler, Fabien; Gohin, Francis; Garlan, Thierry.
Hydro-sedimentary numerical models have been widely employed to derive suspended particulate matter (SPM) concentrations in coastal and estuarine waters. These hydro-sedimentary models are computationally and technically expensive in nature. Here we have used a computationally less-expensive, well-established methodology of self-organizing maps (SOMs) along with a hidden Markov model (HMM) to derive profiles of suspended particulate inorganic matter (SPIM). The concept of the proposed work is to benefit from all available data sets through the use of fusion methods and machine learning approaches that are able to process a growing amount of available data. This approach is applied to two different data sets entitled “Hidden” and “Observable”. The hidden...
Tipo: Text Palavras-chave: Suspended particulate inorganic matter; Self-organizing maps; Hidden Markov Model; Machine learning; English Channel; ROMS.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00415/52653/53511.pdf
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Copernicus Marine Service Ocean State Report, Issue 3 ArchiMer
Von Schuckmann, Karina; Le Traon, Pierre-yves; Smith, Neville; Pascual, Ananda; Djavidnia, Samuel; Gattuso, Jean-pierre; Grégoire, Marilaure; Nolan, Glenn; Aaboe, Signe; Aguiar, Eva; Álvarez Fanjul, Enrique; Alvera-azcárate, Aida; Aouf, Lotfi; Barciela, Rosa; Behrens, Arno; Belmonte Rivas, Maria; Ben Ismail, Sana; Bentamy, Abderrahim; Borgini, Mireno; Brando, Vittorio E.; Bensoussan, Nathaniel; Blauw, Anouk; Bryère, Philippe; Buongiorno Nardelli, Bruno; Caballero, Ainhoa; Çağlar Yumruktepe, Veli; Cebrian, Emma; Chiggiato, Jacopo; Clementi, Emanuela; Corgnati, Lorenzo; De Alfonso, Marta; De Pascual Collar, Álvaro; Deshayes, Julie; Di Lorenzo, Emanuele; Dominici, Jean-marie; Dupouy, Cécile; Drévillon, Marie; Echevin, Vincent; Eleveld, Marieke; Enserink, Lisette; García Sotillo, Marcos; Garnesson, Philippe; Garrabou, Joaquim; Garric, Gilles; Gasparin, Florent; Gayer, Gerhard; Gohin, Francis; Grandi, Alessandro; Griffa, Annalisa; Gourrion, Jerome; Hendricks, Stefan; Heuzé, Céline; Holland, Elisabeth; Iovino, Doroteaciro; Juza, Mélanie; Kurt Kersting, Diego; Kipson, Silvija; Kizilkaya, Zafer; Korres, Gerasimos; Kõuts, Mariliis; Lagemaa, Priidik; Lavergne, Thomas; Lavigne, Heloise; Ledoux, Jean-baptiste; Legeais, Jean Francois; Lehodey, Patrick; Linares, Cristina; Liu, Ye; Mader, Julien; Maljutenko, Ilja; Mangin, Antoine; Manso-narvarte, Ivan; Mantovani, Carlo; Markager, Stiig; Mason, Evan; Mignot, Alexandre; Menna, Milena; Monier, Maeva; Mourre, Baptiste; Müller, Malte; Nielsen, Jacob Woge; Notarstefano, Giulio; Ocaña, Oscar; Pascual, Ananda; Patti, Bernardo; Payne, Mark R.; Peirache, Marion; Pardo, Silvia; Pérez Gómez, Begoña; Pisano, Andrea; Perruche, Coralie; Peterson, K. Andrew; Pujol, Marie-isabelle; Raudsepp, Urmas; Ravdas, Michalis; Raj, Roshin P.; Renshaw, Richard; Reyes, Emma; Ricker, Robert; Rubio, Anna; Sammartino, Michela; Santoleri, Rosalia; Sathyendranath, Shubha; Schroeder, Katrin; She, Jun; Sparnocchia, Stefania; Staneva, Joanna; Stoffelen, Ad; Szekely, Tanguy; Tilstone, Gavin H.; Tinker, Jonathan; Tintoré, Joaquín; Tranchant, Benoît; Uiboupin, Rivo; Van Der Zande, Dimitry; Wood, Richard; Woge Nielsen, Jacob; Zabala, Mikel; Zacharioudaki, Anna; Zuberer, Frédéric; Zuo, Hao.
Tipo: Text
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00515/62637/67004.pdf
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Croissance et mortalité naturelle des trocas (Trochus niloticus L.) de Nouvelle-Calédonie (Mollusca, Gastropoda) IRD
Bour, William; Gohin, Francis; Bouchet, Philippe.
Tipo: Text Palavras-chave: CROISSANCE; MARQUAGE; MORTALITE; MODELE MATHEMATIQUE; ESTIMATION DE STOCK; VARIATION SPATIALE; PECHE DE MOLLUSQUES; COURBE DE VON BERTALANFFY; MOLLUSCA; GASTROPODA; TROCHUS NILOTICUS.
Ano: 1982 URL: http://www.documentation.ird.fr/hor/fdi:03950
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Decline of cold-water fish species in the Bay of Somme (English Channel, France) in response to ocean warming ArchiMer
Auber, Arnaud; Gohin, Francis; Goascoz, Nicolas; Schlaich, Ivan.
A growing number of studies have documented increasing dominance of warm-water fish species (“tropicalisation”) in response to ocean warming. Such reorganization of communities is starting to occur in a multitude of local ecosystems, implying that tropicalisation of marine communities could become a global phenomenon. Using 32 years of trawl surveys in the Bay of Somme (English Channel, France), we aimed to investigate the existence of a tropicalisation in the fish community at the local scale of the estuary during the mid-1990s, a period where an exceptional temperature rise occurred in Northeast Atlantic. A long-term response occurred (with a major transition over 6 years) that was characterized by a marked diminution in the abundance of cold-water...
Tipo: Text
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00374/48551/48873.pdf
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Dynamique de l'upwelling et variabilité spatio-temporelle de la répartition de la sardine marocaine, Sardina pilchardus (Walbaum, 1792) ArchiMer
Kifani, S; Gohin, Francis.
A space-time approach is adopted in an attempt to understand changes in the availability of the central sardine stock along the northwestern Moroccan coast. The warming observed in 1987 and 1989, due to the decline in wind activity, seems to have some repercussions on sardine distribution. The decrease in upwelling activity seems to have favoured concentration in the vicinity of Safi, and thus rendered the sardines more vulnerable to the purse-seiners of this port. We seek to explain the failure of the link established by Belveze and Erzini (1983) between sardine availability and upwelling activity in thc northern area. Two hypotheses, taking into account the local hydrology or the tendency of pelagic species to aggregate in time and space, have been put...
Tipo: Text Palavras-chave: UPWELLING; MOROCCO; SARDINE; SEA SURFACE TEMPERATURE.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00100/21151/18770.pdf
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Estimating turbidity and total suspended matter in the Adour River plume (South Bay of Biscay) using MODIS 250-m imagery ArchiMer
Petus, Caroline; Chust, Guillem; Gohin, Francis; Doxaran, David; Froidefond, Jean-marie; Sagarminaga, Yolanda.
The Basque coastal waters (South Bay of Biscay) are directly influenced by the Adour River freshwater plume. The Adour outflow leads to important variations of suspended matter concentrations and turbidity, which in turn may affect biological productivity and water quality. This study aims at both developing specific algorithms and testing the efficiency of atmospherically corrected MODIS-Aqua 250-m surface reflectance product (MYD09) to map total suspended matter concentrations and turbidity within the Adour coastal region. First, regional empirical algorithms based on in-situ data were tested to retrieve the concentration of total suspended matter and turbidity from the remote sensing reflectance. Then, the respective sensitivity of MODIS surface...
Tipo: Text Palavras-chave: Adour River plume; Turbidity; Suspended matter; Satellite sensing; MODIS; Remote sensing reflectance.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00003/11383/8042.pdf
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Estimation d'un stock naturel de coquille Saint Jacques par une méthode combinant les dragages et la plongée. Traitement des résultats par une méthode géostatistique ArchiMer
Buestel, Dominique; Dao, Jean-claude; Gohin, Francis.
The efficiency of the fishing drags in the Saint Brieuc Bay, Brittany, has been determined through the analysis of the tracks left on the seabed. The results, which focus mostly on the age class n°2 (2.5 years), show that the efficiency and the damages caused by the drags vary heavily according to the nature of the seabed. For soft bottoms, the average efficiency is 67 % and the global damage is 2 %. Concerning hard bottoms, the values are respectively 30 % and 17 %. These efficiency results combined with those of a dragging expedition in a set sector of the Saint-Brieuc Bay enable a direct assessment of the abundance. A result treatment method deriving from the geostatistical theory is used: it takes into account the spatial structure of the king scallop...
Tipo: Text Palavras-chave: Coquille Saint Jacques; Plongée; Dragage; Pecten maximus L.; Estimation stocks.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-6536.pdf
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Estimation d'un stock naturel de coquilles Saint-Jacques par une méthode combinant les dragages et la plongée. Traitement des résultats par une méthode géostatistique ArchiMer
Buestel, Dominique; Dao, Jean-claude; Gohin, Francis.
The efficiency of the scallop dredge used in baie de St Brieuc (Britany) has been directly determined by divers swimming along the track marks left on the bottom. Results, concerning essentially year class two, show that efficiency and damage caused by the dredge on scallops are highly variable according to nature of the sea bed. On smooth grounds, the average efficiency is 67% and the average percentage for severely damged scallops is 2% ; on rough grounds, theses percentages are respectively 30% and 17%. These results associated with a dredge survey on a particular area of the baie de St Brieuc allow an assessment of scallops abundance. The statistical method used, relevant to the geostatistic theory, takes into account the scallop spatial distribution...
Tipo: Text Palavras-chave: Estimation stock; Coquille Saint Jacques; Dragage; Saint-Brieuc; Méthode géostatistique; Bretagne.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/00009/12001/8695.pdf
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Estimation of the diffuse attenuation coefficient K-dPAR using MERIS and application to seabed habitat mapping ArchiMer
Saulquin, Bertrand; Hamdi, Anouar; Gohin, Francis; Populus, Jacques; Mangin, Antoine; D'Andon, Odile Fanton.
The availability of light in the water column and at the seabed determines the euphotic zone and constrains the type and the vertical distribution of algae species. Light attenuation is traditionally quantified as the diffuse attenuation coefficient of the downwelling spectral irradiance atwavelength 490 nm(Kd490) or the photosynthetically available radiation (KdPAR). Satellite observations provide global coverage of these parameters at high spatial and temporal resolution and several empirical and semi-analytical models are commonly used to derive Kd490 and KdPAR maps from ocean colour satellite sensors. Most of these existing empirical or semi-analytical models have been calibrated in open ocean waters and performwell in these regions, but tend to...
Tipo: Text Palavras-chave: Ocean color; Light attenuation; Photosynthetic available radiation; Euphotic depth; Seabed mapping.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00117/22831/21496.pdf
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Etude de la variation des paramètres biomasse (Chla) et turbidité sur plus de 10 années dans les eaux marines guyanaises par imagerie satellite. - Phase 2 : utilisation de la résolution à 300 m ArchiMer
Lampert, Luis; Bryere, Philippe; Gohin, Francis.
On the extremely turbid waters of French Guyana, the high-resolution satellite imagery (300 m) seems a very good tool for monitoring coastal and estuarine waters. It is possible to adjust the algorithms and calculation methods to be in the range of values suggested by in-situ measurements and thus, have the long data series, where P90chla and P90turbi parameters can be calculated on the MEC.
Tipo: Text Palavras-chave: Guyane française; Images satellite; Turbidité; Chlorophylle; P90; MEC; MET; DCE; French Guiana; Satellite imagery; Turbidity; Chlorophyll; P90; MEC; MET; DCE.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00369/47992/48020.pdf
Registros recuperados: 80
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