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Registros recuperados: 15
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A two-stage biomass model to assess the English Channel cuttlefish (Sepia officinalis L.) stock ArchiMer
Gras, Michael; Roel, Beatriz A.; Coppin, Franck; Foucher, Eric; Robin, Jean-paul.
The English Channel cuttlefish (Sepia officinalis) is the most abundant cephalopod resource in the Northeast Atlantic and one of the three most valuable resources for English Channel fishers. Depletion methods and age-structured models have been used to assess the stock, though they have shown limitations related to the model assumptions and data demand. A two-stage biomass model is, therefore, proposed here using, as input data, four abundance indices derived from survey and commercial trawl data collected by Ifremer and Cefas. The model suggests great interannual variability in abundance during the 17 years of the period considered and a decreasing trend in recent years. Model results suggest that recruitment strength is independent of spawning-stock...
Tipo: Text Palavras-chave: Abundance indices; English Channel; Exploitation rate; Sepia officinalis; SST; Stock–recruitment relationship; Trawl survey; Two-stage biomass model.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00248/35923/34448.pdf
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Compatibility of C- and Ku-band scatterometer winds: ERS-2 and QuikSCAT ArchiMer
Bentamy, Abderrahim; Grodsky, Semyon A.; Chapron, Bertrand; Carton, James A..
Global winds provided by satellite scatterometry are an important aspect of the ocean observing system. Many applications require well-calibrated time series of winds over time periods spanned by multiple missions. But sensors on individual satellites differ, introducing differences in wind estimates. This study focuses on global winds from two scatterometers, ERS-2 (1996-2001) and QuikSCAT (1999-2009) that show persistent differences during their period of overlap (July-1999 to January 2001). We examine a set of collocated observations during this period to evaluate the causes of these differences. The use of different operating frequencies leads to differences that depend on rain rate, wind velocity, and SST. The enhanced sensitivity to rain rate of the...
Tipo: Text Palavras-chave: Scatterometer winds; SST; Inter-instrument bias.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00139/25071/23190.pdf
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ENSO AND SOYBEAN PRICES: CORRELATION WITHOUT CAUSALITY AgEcon
Letson, David; McCullough, B.D..
In this paper we seek to characterize the robustness of the ENSO/soybean price relationship and to determine whether it has practical economic content. If such a meaningful relationship exists, the implications could be profound for commodity traders and for public sector investments in climate forecasting capabilities. Also, the validity of economic evaluations of climate impacts and climate forecasts based on ENSO-price independence would come into question. Our findings suggest a relationship between interannual climate and soybean prices, although we are not able to attribute the relationship to ENSO or to say the ENSO is economically important.
Tipo: Journal Article Palavras-chave: Climate forecasting; Granger causality; Spectral analysis; SOI; SST; Resource /Energy Economics and Policy; C22; Q11.
Ano: 2001 URL: http://purl.umn.edu/15443
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Etude de la variation des paramètres température, biomasse et turbidité sur plus de 10 années dans les eaux marines guyanaises par imagerie satellite ArchiMer
Lampert, Luis; Bryere, Philippe; Gohin, Francis.
Dans le cadre de la réalisation de la fiche Onema, intitulée « Etude de la variation des paramètres température, biomasse et turbidité sur plus de 10 années dans les eaux marines guyanaises par imagerie satellite » ce rapport final présente les résultats sur ces paramètre en relation aux questions posées dans cette fiche. L’utilisation des images à une résolution de 300m est abordée, ainsi qu’une proposition de stratégie de suivis des masses d’eau côtières basée sur les résultats obtenus
Tipo: Text Palavras-chave: Guyane française; Images satellite; SST; Turbidité; MES; Chlorophylle; DCE.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00294/40531/39339.pdf
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Etude sur la température de surface de la mer des eaux guyanaises dans le contexte DCE ArchiMer
Lampert, Luis.
Le manque de données disponibles sur les eaux marines guyanaises peut en partie être comblé par l’apport des images satellite remontant à plus de 10 années. Cette étude propose de faire le point sur l’évolution de la température de surface de la mer (SST) dans le cadre de la DCE. Une approche régionale et locale a été menée afin de déterminer si la température est suffisamment discriminante pour permettre une proposition de découpage de la masse d’eau côtière MEC.
Tipo: Text Palavras-chave: DCE; SST; Guyane; Satellite; ODYSSEA; OSTIA; Masse d’eau côtière.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00294/40509/39305.pdf
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Expédition OceanoScientific 2016-2017 : Etudes des mesures de température et de salinité de surface ArchiMer
Reynaud, Thierry; Reverdin, Gilles; Metzl, Nicolas; Griboval, Yvan.
The OceanoScientific Programm was initiated in 2006 and yielded the creation of a specific equipment : the OSC-System. The OSC-System measures physical parameters at the air-sea interface including Sea Surface temperature and Salinity. An OSC-System was installed on board of the OceanoScientific Explorer Boogaloo sailing ship. A cruise around the world was initiated the 17/11/2016 and ended 02/06/2017 including 60 days south of 40°S. Sea Surface temperature and salinity collected along this cruise are discussed in this technical report.
Tipo: Text Palavras-chave: Mesures; Température; Salinité; Surface; Oceanoscientific; Boogaloo; Antarctique; Temperature; Salinity; SST; SSS; Measurements; Antarctic.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00472/58356/60914.pdf
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Fish Species in a Changing World: The Route and Timing of Species Migration between Tropical and Temperate Ecosystems in Eastern Atlantic ArchiMer
Kaimuddin, Awaluddin H.; Laë, Raymond; Tito De Morais, Luis.
The presence of tropical species has been reported in Atlantic-European waters with increasing frequency in recent years. Unfortunately, the history of their migrations is not well understood. In this study, we examined the routes and timing of fish migrations in several ecosystems of the East Atlantic Ocean, combining several publicly available and unpublicized datasets on species occurrences. The species studied were those noted as exotic or rare outside their previous known area of distribution. We used sea surface temperature (SST) data obtained from 30 years of satellite observation to define three distinct time periods. Within these periods, temperature trends were studied in six ecosystems: the North Sea, the Celtic Sea, the South European Atlantic...
Tipo: Text Palavras-chave: Speciesmigration; Atlantic-europeanwaters; Biogeographic; SST; Bathymetry; GIS.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00469/58030/60434.pdf
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Modulation of sea surface temperature warming in the Bay of Biscay by Loire and Gironde Rivers ArchiMer
Costoya, X.; Fernandez-novoa, D.; Decastro, M.; Santos, F.; Lazure, Pascal; Gomez-gesteira, M..
The influence of Loire and Gironde River discharges over the sea surface temperature (SST) in the eastern Bay of Biscay (0.6º–36.6ºW, 44.2º–47.8ºW) was analyzed by means of two complementary databases (MODIS and OISST1/4). The area influenced by river plume showed a different SST when compared with the adjacent oceanic area for the months when the plume attains its highest extension (December, January, and February). Ocean was observed to warm at a rate of approximately 0.3ºC dec−1 while temperature at the area influenced by the rivers cooled at a rate of −0.15ºC dec−1 over the period 1982–2014. The mere presence of a freshwater layer is able to modulate the warming observed at adjacent ocean locations since the coastal area is isolated from the rest of...
Tipo: Text Palavras-chave: Loire; Gironde; SST; River plume; Warming modulation.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00311/42172/41472.pdf
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Observation and modelling of natural retention structures in the English Channel ArchiMer
Menesguen, Alain; Gohin, Francis.
Accumulation of heat, or dissolved substances (nutrients, pollutants, etc.), or fine suspended particles in a water body is a key process in the functioning of aquatic ecosystems and their resistance to perturbations. In complex and wide open environments such as marine ecosystems, net accumulation is not only linked to the local renewal capacity of the water body, but also to the partial recirculation of water due to convective cells of various sizes. The English Channel, which can be considered as mainly dominated by tidal movements, exhibits such a complex quasi-permanent long-term circulation, made of a central "river" bordered with a lot of nested gyres. Here, we show that structures visible on satellite images of SST (Sea Surface Temperature),...
Tipo: Text Palavras-chave: Remote sensing; Suspended Particulate Matter; Chlorophyll; SST; Retention structures; Tidal residual circulation; Steady state model; English Channel.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2181.pdf
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Observed and projected Sea Surface Temperature seasonal changes in the Western English Channel from satellite data and CMIP5 multi-model ensemble. ArchiMer
L'Heveder, Blandine; Speich, Sabrina; Ragueneau, Olivier; Gohin, Francis; Bryere, Philippe.
Seasonal Sea Surface Temperature (SST) changes in the Western English Channel have been estimated for the previous decades from high-resolution satellite data. Coastal seas, well separated from offshore waters by intense frontal structures, show colder SST by 1 to 2°C in summer. A significant warming trend is observed in the autumn season. This positive trend is stronger offshore, with an annual mean SST increase of 0.32°C/decade, but weaker in coastal waters (0.23°C/decade), where strong vertical mixing induced by tides and winds acts to reduce surface warming. The performance of an ensemble of CMIP5 climate model in simulating recent seasonal changes of SST in the region is estimated. The median of CMIP5 models reproduces very well the observed SST mean...
Tipo: Text Palavras-chave: SST; Climate change; Western English Channel; CMIP5; Regional study.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00350/46163/45861.pdf
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Reconstruction of late Quaternary marine and terrestrial environmental conditions of Northwest Africa and Southeast Australia. A multiple organic proxy study using marine sediments ArchiMer
Lopes Dos Santos, Raquel A.
NW Africa and SE Australia are regions which are particularly vulnerable to climate change. In this thesis, organic proxies are used from marine sediment cores to reconstruct past environmental conditions from these areas. In sediments from NW Africa, the UK'37 showed an efficient proxy for sea surface temperature (SST) reconstruction, while the TEXH86 reconstructed thermocline temperatures. The UK'37 and TEXH86 records for the last 192 ka showed that periods of reduced AMOC coincide with a reduction in the vertical temperature gradient. Thus, variations in AMOC strength is a driver of the thermocline structure in the tropical Atlantic. Three independent organic proxies (UK’37,TEXH86 and LDI) were used to reconstruct SSTs for the last 135 ka in sediments...
Tipo: Text Palavras-chave: Keywords: organic proxies; Paleoclimate; NW Africa; SE Australia; SST; Productivity; Vegetation.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00494/60594/64078.pdf
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SST spatial anisotropic covariances from METOP-AVHRR data ArchiMer
Tandeo, Pierre; Autret, Emmanuelle; Chapron, Bertrand; Fablet, Ronan; Garello, Rene.
The Advanced Very High Resolution Radiometer (AVHRR) instrument on-board the METOP satellite is designed to provide very accurate measurements of Sea Surface Temperature (SST). In this work, using one year of METOP-AVHRR data and a geostatistical approach, we characterize the spatial anisotropy and non-stationarity of the SST variability using oriented ellipsoids. The method is also able to separate the true SST variability from the artificial error introduced by the METOP-AVHRR sensor. These spatial parameters are then used for producing variability atlases (available on-line) over the whole ocean.
Tipo: Text Palavras-chave: SST; METOP-AVHRR; Spatial variability; Anisotropy.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00165/27586/25818.pdf
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Three-dimensional reconstruction of oceanic mesoscale currents from surface information - art. no. C09005 ArchiMer
Isern-fontanet, Jordi; Lapeyre, Guillaume; Klein, Patrice; Chapron, Bertrand; Hecht, M.
The ability to reconstruct the three-dimensional (3D) dynamics of the ocean by an effective version of Surface Quasi-Geostrophy (eSQG) is examined. Using the fact that surface density plays an analogous role as interior potential vorticity (PV), the eSQG method consists in inverting the QG PV generated by sea-surface density only. We also make the extra assumption that sea-surface temperature (SST) anomalies fully represent surface density anomalies. This approach requires a single snapshot of SST and the setup of two parameters: the mean Brunt-Vaisala frequency and a parameter that determines the energy level at the ocean surface. The validity of this approach is tested using an Ocean General Circulation Model simulation representing the North Atlantic in...
Tipo: Text Palavras-chave: 3D dynamics reconstruction; SST; Surface Quasi Geostrophy.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4620.pdf
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Variabilité de la salinité de surface d'après un modèle global de couche mélangée océanique ArchiMer
Michel, Sylvain.
Sea surface salinity (SSS) influences numerous oceanic phenomena, for instance surface water ventilation, deep water formation and thermohaline circulation. SSS also controls some ocean-atmosphere coupled processes, such as the intensity of freshwater flux and the penetration of heat flux and turbulence. Salinity is more difficult to measure than temperature from in situ surveys, which results in 20 times less data being currently available. Moreover, sea surface temperature (SST) is routinely estimated from satellites, which is not possible yet for SSS. Two space missions will fill this gap soon: SMOS from the European Space Agency and Aquarius/SAC-D from NASA and CONAE. To contribute to the SMOS project, we propose a method for estimating SSS from...
Tipo: Text Palavras-chave: SMOS; SSS; SST; MLD; Heat balance; Vertical entrainment; Geostrophic current; Air sea fluxes; Satellite observations; Mixed layer; Salinity; SMOS; SSS; SST; MLD; Bilan de chaleur; Entraînement vertical; Courants géostrophiques; Flux air mer; Observations satellitaires; Couche mélangée; Salinité.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-2302.pdf
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Wind and temperature controls on Alexandrium blooms (2000-2007) in Thau lagoon (Western Mediterranean) ArchiMer
Laanaia, Nabil; Vaquer, Andre; Fiandrino, Annie; Genovesi, Benjamin; Pastoureaud, Annie; Cecchi, Philippe; Collos, Yves.
Since 1998, blooms of Alexandrium catenella/tamarense in the lagoon of Thau developed regularly each autumn, reaching a maximum of several millions cells per liter in 2004. By contrast, spring blooms occurred only twice (in 2000 and 2007). During these periods, sea surface temperatures (SST) and the wind patterns appear to impact the bloom occurrences much more than the apparent limiting resources such as inorganic nutrients. The analysis of SST and wind from April to June and September to November (from 2000 to 2007) indicates first that there has to be an initial wind stress in order to resuspend the cysts buried in the sediment. Blooms then occur after a period of weak winds (<4 m s(-1)) and of stable SST close to 20 degrees C (+/- 2 degrees C)....
Tipo: Text Palavras-chave: Alexandrium catenella/tamarense; Wind stress; SST; Thau lagoon; Mediterranean.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00157/26790/24936.pdf
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