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| Registros recuperados: 17 | |
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| Pineau-guillou, Lucia; Ardhuin, Fabrice; Bouin, Marie-noelle; Redelsperger, Jean-luc; Chapron, Bertrand; Bidlot, Jean-raymond; Quilfen, Yves. |
| Strong winds may be biased in atmospheric models. Here the ECMWF coupled wave-atmosphere model is used (1) to evaluate strong winds against observations, (2) to test how alternative wind stress parameterizations could lead to a more accurate model. For the period of storms Kaat and Lilli (23 to 27 January 2014), we compared simulated winds with in-situ – moored buoys and platforms - and satellite observations available from the North Atlantic. Five wind stress parameterizations were evaluated. The first result is that moderate simulated winds (5-20 m s-1) match with all observations. However, for strong winds (above 20 m s-1), mean differences appear, as much as -7 m s-1 at 30 m s-1. Significant differences also exist between observations, with buoys and... |
| Tipo: Text |
Palavras-chave: Air-sea exchanges; Northeast Atlantic; Winds; IFS; Sea state; Roughness length; Drag coefficient; Wind stress. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00410/52118/52826.pdf |
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| Quilfen, Yves; Prigent, C; Chapron, Bertrand; Mouche, Alexis; Houti, N. |
| The physics of remote sensing sea surface measurements is still poorly understood under severe weather conditions. Wind vector algorithms are usually developed for non-precipitating atmospheres and for wind speeds less than 20 m/s. In this study, we analyze observations from the QuikSCAT Ku-band scatterometer collocated with the WindSat full polarimetric microwave radiometer to estimate the potential of these two instruments for sea surface wind retrieval under severe weather conditions. The Jason altimeter provides independent measurements of wind speed and rain rate for comparison purposes. The sensitivity of the radar cross-sections and brightness temperatures to the wind speed and direction is directly studied from the observations and compared with... |
| Tipo: Text |
Palavras-chave: Winds; Scatterometer; Radiometer. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-6393.pdf |
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| Biais, Gerard; Taquet, Marc. |
| The authors deal with the coastal fisheries in the Reunion Island. In a first chapter they describe the geographical environment of this island (volcanism, climate, cyclones, hydrology, currents water masses) which has an influence on fisheries results. The second and third chapter describe the commercial species of the Reunion island (pelagic fishes: Scombridae as Thunnus albacares, Katsunonus pelamis, Euthynnus affinis, Thunnus obesus, Gymnosarda unicolor, Thunnus alalunga, other fishes as Xiphias gladius, Makaira mazara, Istiophorus platypterus. The fourth chapter deals with the fishing gears and the catching methods. The fifth chapter is devoted to fishery economics, financing |
| Tipo: Text |
Palavras-chave: Winds; Climate; Catching methods; Fishery economics; Pelagic fisheries; Fishing gear; Fishing vessels; Fishing. |
| Ano: 1992 |
URL: https://archimer.ifremer.fr/doc/1992/rapport-1455.pdf |
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| Lifschitz, A.J.. |
| El objetivo del presente trabajo es estimar el transporte total de volumen de la Corriente de Malvinas (CM). La hipótesis de trabajo es que es posible ajustar el transporte baroclínico, determinado a partir de observaciones del campo de densidad, mediante perfiles de velocidad observada transversales al talud continental, promediados sobre áreas extensas. Se emplean datos hidrográficos para el cálculo de las velocidades y transportes geostróficos relativos a la máxima profundidad común a cada par de estaciones. Las velocidades geostróficas por debajo de este nivel son estimadas mediante la extrapolación lineal de la velocidad relativa. Las velocidades absolutas son determinadas ajustando los perfiles de velocidad relativa a observaciones de la estructura... |
| Tipo: Theses and Dissertations |
Palavras-chave: Current measurement; Current data; Winds; Water masses; Physical oceanography; Winds; Physical oceanography. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/3858 |
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| Zambrano Q., E.; Allauca, S.; Arcos, F.. |
| En el verano austral de 1990, durante la II Expedición Ecuatoriana a la Antártica a bordo del B/I ORION se efectuaron dos secciones (ida y retorno) en el Paso Drake, en las cuales se realizaron un total de 28 lances de XBT y el muestreo horario de parámetros superficiales como temperatura del mar, del aire, salinidad, vientos y clorofila "a". Los resultados obtenidos en ambas secciones permiten observar la variación de estos parámetros, en el transcurso aproximado de un mes, en el Paso Drake durante aquella época. Claramente, en las secciones verticales de temperatura, se observa la presencia de los Frentes Polar y Subantártico, dando lugar a una marcada convergencia Antártica. En el transcurso de casi un mes entre las dos secciones, se puede observar el... |
| Tipo: Journal Contribution |
Palavras-chave: Surface temperature; Air temperature; Salinity; Winds; Chlorophylls; Winds; Air temperature; Salinity; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_8401; Http://aims.fao.org/aos/agrovoc/c_230; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_1577. |
| Ano: 1990 |
URL: http://hdl.handle.net/1834/3729 |
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| Chaouachi, B.; Ben Hassine, O.K.; Lemoalle, J.. |
| Dans la lagune de l'Ichkeul, le vent fort remet les particules en suspension et diminue la transparence des eaux, en raison de la faible profondeur de ce plan d'eau (1m environ, en moyenne). Les vents les plus fréquents soufflent du secteur ouest à nord-ouest. L'amplitude des fluctuations de leur vitesse est modérée durant le printemps et l'été. En revanche, elle est accentuée en automne et en hiver, période durant laquelle sont enregistrées, à la fois, les plus faibles et les plus fortes vitesses du vent. La transparence des eaux est évaluée à l'aide du disque de Secchi. Les eaux de la lagune sont plus claires lorsqu'elles reçoivent, peu ou pas du tout, des apports d'eau continentale, chargée en alluvions et lorsqu'elles sont peu soumises à la turbulence... |
| Tipo: Journal Contribution |
Palavras-chave: Secchi discs; Water transparency; Winds. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/246 |
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| Registros recuperados: 17 | |
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