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Registros recuperados: 24
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ASCAT/MetOp scatterometer data : first results for sea ice study ArchiMer
Ardhuin, Fanny; Ezraty, Robert; Croize-fillon, Denis.
Backscatter values from scatterometers are commonly used to estimate wind field over oceans, their ability to monitor sea ice coverage, age and drift has been also demonstrated. Here, ASCAT backscatter coefficient has been processed for sea ice geophysical interpretation in order to increase the long time series of ice parameters already available. It has been shown that incidence- adjustment is mandatory for geophysical meaning, the backscatter maps enable the discrimination between multi year ice and first year ice, these maps can also be used as a basic product for sea ice drift estimation. (Copyright : European Space Agency ISBN 978-92-9221-239-1 ISSN 1609-042X)
Tipo: Text Palavras-chave: Sea ice; Wind; Scatterometer; ASCAT; MetOp; Glaces de mer; Vent; Diffusiomètre; ASCAT; MetOp.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/acte-6970.pdf
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Condiciones hidrometeorológicas en la porción central del golfo de Ana María, Cuba OceanDocs
Matos Pupo, F.; Batista Tamayo, L. M.; Sánchez Hernández, A..
El golfo de Ana María constituye una zona con grandes reservas naturales y de condiciones climáticas muy específicas, que la ubica como favorable para explotar por dos sectores económicos de importancia nacional: la pesca y el turismo; el que cobra mayor auge en los últimos años. Se realizó una evaluación de las condiciones hidrometeorológicas en su porción central, determinándose en diecisiete puntos de muestreo durante octubre de 2011, el comportamiento de cinco elementos meteorológicos: nubosidad, dirección y velocidad del viento, temperatura y fenómenos atmosféricos. Todas las mediciones y observaciones fueron realizadas por medio de una metodología elaborada previamente, aplicable a zonas alejadas del alcance máximo de las estaciones de...
Tipo: Journal Contribution Palavras-chave: Atmospheric conditions; Meteorological data; Environmental monitoring; Temperature; Wind; Cloudiness.
Ano: 2012 URL: http://hdl.handle.net/1834/4635
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Disseminação pelo vento do nematóide de cisto da soja (Heterodera glycines). Infoteca-e
ANDRADE, P. J. M.; ASMUS, G. L..
1996
Tipo: Comunicado Técnico (INFOTECA-E) Palavras-chave: Soja; Nematoide de cisto; Dissemincao; Vento; Cerrado; Heterodera glycines; Glycine max; Soybean cyst nematode; Spred; Wind.
Ano: 1996 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/241125
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Estimating the wreckage location of the Rio-Paris af447 ArchiMer
Ollitrault, Michel; Blanke, Bruno; Chen, Changsheng; Diansky, Nicolai; Drevillon, Marie; Greiner, Eric; Lefevre, Fabien; Limeburner, Richard; Lezaud, Pascal; Louazel, Stéphanie; Nurser, George; Paradis, Denis; Scott, Robert.
Tipo: Text Palavras-chave: Current; Equator; Wind; RIO-PARIS AF447.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00027/13777/10915.pdf
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Fluctuations of landings and environmental conditions in the north-western Mediterranean Sea ArchiMer
Lloret, J; Lleonart, J; Sole, I; Fromentin, Jean-marc.
Most of the monthly catches and CPUE of 13 studied commercial species in the coastal waters of the north-western Mediterranean were significantly positively correlated with run-off of local rivers (Rhone and Muga) and the wind mixing index during the spawning season, with time lags of less than a year (transfer function analyses). Rhone and Ebre interannual fluctuations in run-off were synchronous and were related to the North Atlantic Oscillation (NAO), river run-offs being negatively correlated to high NAO episodes. The fluctuations of river discharges and the wind mixing index were cyclic but not related. The results showed that enhanced hydroclimatic conditions in the NW Mediterranean were favourable for the productivity of the fish and invertebrate...
Tipo: Text Palavras-chave: Wind; Rhone River; NAO index; Muga River; Mediterranean fisheries; Gulf of Roses Cape Creus; Gulf of Lions; Ebre River; Box Jenkins models.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/publication-672.pdf
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General Characteristics Of Airborne Pollen In Montevideo City, Uruguay Boletín de la Sociedad
TEJERA,LETICIA; BERI,ÁNGELES; MARTÍNEZ BLANCO,XIMENA.
This paper analyses daily and seasonal variations on pollen concentrations and the infuence of meteorological conditions on the airborne pollen from June 2011 to May 2014. Data is also compared with results from a previous pollen survey from 2000-2001. Ninety-three taxa were identifed, belonging to 49 trees and shrub taxa and 44 herbaceous taxa. The most important pollen sources were Poaceae, Platanus, Cupressaceae/Taxaceae, Eupatorieae type, Celtis, Urticaceae, Myrtaceae, Casuarina, Amaranthaceae, Cyperaceae, Fraxinus, Arecaceae, Ricinus communis, Moraceae, Myrsine, Ambrosia, Quercus, and Pinaceae. Pollen was recorded all year round but the main pollen season was from August to April. Inter-annual differences were observed on pollen indexes, dates and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Airborne pollen; Meteorology; Threshold levels; Wind; Montevideo; Uruguay..
Ano: 2018 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722018000200010
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GNSS-R nonlocal sea state dependencies: Model and empirical verification ArchiMer
Chen-zhang, David D.; Ruf, Christopher S.; Ardhuin, Fabrice; Park, Jeonghwan.
Global Navigation Satellite System Reflectometry (GNSS-R) is an active, bistatic remote sensing technique operating at L-band frequencies. GNSS-R signals scattered from a rough ocean surface are known to interact with longer surface waves than traditional scatterometery and altimetry signals. A revised forward model for GNSS-R measurements is presented which assumes an ocean surface wave spectrum that is forced by other sources than just the local near-surface winds. The model is motivated by recent spaceborne GNSS-R observations that indicate a strong scattering dependence on significant wave height, even after controlling for local wind speed. This behavior is not well represented by the most commonly used GNSS-R scattering model, which features a...
Tipo: Text Palavras-chave: Waves; Wind; Remote sensing.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00358/46909/46809.pdf
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Influencia do rio Sao Francisco no microclima de suas margens. Repositório Alice
TEIXEIRA, A.H. de C.; SILVA, B.B. da..
Neste estudo foi avaliado o efeito do rio Sao Francisco sobre parametros microclimaticos em suas margens, principalmente na evaporacao da agua. Utilizara-se dados climaticos das estacoes agrometeorologicas Mandacaru (Juazeiro-BA) e de Bebedouro (Petrolina-PE). Percebeu-se que devido a influencia do rio em parametros climaticos atuantes no processo de evaporacao da agua, os valores desse ultimo processo sao mais baixos na margem esquerda, com relacao a margem direita.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Evaporacao; Temperatura do ar; Umidade do ar; Vento; Radiacao solar; Brasil; Rio Sao Francisco; Evapotranspiration; Air temperature; Air humidity; Wind; Solar radiation; Brazil.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/133587
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Long-term changes on estuarine ciliates linked with modifications on wind patterns and water turbidity ArchiMer
López-abbate, M. Celeste; Molinero, Juan-carlos; Perillo, Gerardo M.e.; Barría De Cao, M. Sonia; Pettigrosso, Rosa E.; Guinder, Valeria A.; Uibrig, Roman; Berasategui, Anabela A.; Vitale, Alejandro; Marcovecchio, Jorge E.; Hoffmeyer, Mónica S..
Planktonic ciliates constitute a fundamental component among microzooplankton and play a prominent role in carbon transport at the base of marine food webs. How these organisms respond to shifting environmental regimes is unclear and constitutes a current challenge under global ocean changes. Here we examine a multiannual field survey covering 25 years in the Bahía Blanca Estuary (Argentina), a shallow, flood-plain system dominated by wind and tidal energy. We found that the estuary experienced marked changes in wind dominant regimes and an increase in water turbidity driven from the joint effect of persistent long-fetch winds and the indirect effect of the Southern Annular Mode. Along with these changes, we found that zooplankton components, i.e. ciliates...
Tipo: Text Palavras-chave: Tintinnids; Oligotrichs; Acartia tonsa; Wind; Turbidity; Estuaries.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00471/58252/60760.pdf
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Meteorological and hydrological variables on occurrence of riverbank erosion along lower São Francisco river AGRIAMBI
Rocha,Igor P. da; Holanda,Francisco S. R.; Araújo Filho,Renisson N.; Casado,Ana P. B.; Bandeira,Arilmara A..
The objectives of this paper were to analyze the seasonal distributions of climatic and hydrological variables along the Lower São Francisco River, Northeastern Brazil, between the States of Sergipe and Alagoas, and further, to verify their relationships with the erosion of the right margin in Sergipe State. The investigated area comprises the sedimentary portions of the Lower São Francisco River, located at the Cotinguiba-Pindoba Irrigated Perimeter. Historical records of variables such as rainfall, river streamflow velocity, river discharge, wind velocity and the predominant direction were collected from a climatological station as well as rain and streamflow gauges located in the municipality of Propriá. The rainfall that occurs in the region is...
Tipo: Info:eu-repo/semantics/article Palavras-chave: River discharge; Wind; Rainfall; Water resources.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013000200004
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Microclimate alterations caused by agricultural hail net coverage and effects on apple tree yield in subtropical climate of Southern Brazil Bragantia
Bosco,Leosane Cristina; Bergamaschi,Homero; Cardoso,Loana Silveira; Paula,Viviane Aires de; Marodin,Gilmar Arduino Bettio; Brauner,Pedro Correa.
ABSTRACT The use of hail net coverage on plants is an effective measure to mitigate damage caused by hailstorms. In southern Brazil, areas with apple orchards under hail net coverage have increased in recent years. However, little is known about the possible effects on the microclimate and, consequently, on plant growth, crop yield and fruit quality. The hypothesis of this study was that hail net promotes microclimate and yield changes in apple orchards. The objective was to characterize the microclimate and production of apple trees cultivated under hail nets and to consequently generate numeric parameters that can be used in the management of apple orchards and in crop modeling. The study was conducted in commercial orchards growing under hail net and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Malus domestica Borkh; Solar radiation; Air temperature; Humidity; Wind.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000100181
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Remotely Sensed Winds and Wind Stresses for Marine Forecasting and Ocean Modeling ArchiMer
Bourassa, Mark A.; Meissner, Thomas; Cerovecki, Ivana; Chang, Paul S.; Dong, Xiaolong; De Chiara, Giovanna; Donlon, Craig; Dukhovskoy, Dmitry S.; Elya, Jocelyn; Fore, Alexander; Fewings, Melanie R.; Foster, Ralph C.; Gille, Sarah T.; Haus, Brian K.; Hristova-veleva, Svetla; Holbach, Heather M.; Jelenak, Zorana; Knaff, John A.; Kranz, Sven A.; Manaster, Andrew; Mazloff, Matthew; Mears, Carl; Mouche, Alexis; Portabella, Marcos; Reul, Nicolas; Ricciardulli, Lucrezia; Rodriguez, Ernesto; Sampson, Charles; Solis, Daniel; Stoffelen, Ad; Stukel, Michael R.; Stiles, Bryan; Weissman, David; Wentz, Frank.
Strengths and weakness of remotely sensed winds are discussed, along with the current capabilities for remotely sensing winds and stress. Future missions are briefly mentioned. The observational needs for a wide range of wind and stress applications are provided. These needs strongly support a short list of desired capabilities of future missions and constellations.
Tipo: Text Palavras-chave: Satellite; Wind; Stress; Ocean; Requirements.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00511/62312/66565.pdf
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Response of North-Atlantic Ocean circulation to atmospheric weather regimes ArchiMer
Barrier, Nicolas; Cassou, Christophe; Deshayes, Julie; Treguier, Anne-marie.
A new framework is proposed for investigating the atmospheric forcing of North-Atlantic ocean circulation. Instead of using classical modes of variability, such as the North-Atlantic Oscillation (NAO) or the East-Atlantic Pattern, we here use the weather regimes paradigm. Using this framework we avoid problems associated with the assumptions of orthogonality and symmetry that are particular to modal analysis and known to be unsuitable for the NAO. Using ocean-only historical and sensitivity experiments, we investigate the impacts of the four winter weather regimes on horizontal and overturning circulations. Our results suggest that the Atlantic Ridge (AR), NAO− and NAO+ regimes induce a fast (monthly to interannual timescales) adjustment of the gyres via...
Tipo: Text Palavras-chave: Circulation; Dynamics; Meridional overturning circulation; Atm; Ocean Structure; Phenomena; Gyres; North Atlantic Oscillation; Wind; Physical Meteorology and Climatology; Climate classification; Regimes; Models and modeling; Ocean models.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00161/27258/25467.pdf
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Scientific Developments and the EPS-SG Scatterometer ArchiMer
Stoffelen, Ad; Aaboe, Signe; Calvet, Jean-christophe; Cotton, James; De Chiara, Giovanna; Saldana, Julia Figa; Mouche, Alexis; Portabella, Marcos; Scipal, Klaus; Wagner, Wolfgang.
The second-generation exploitation of meteorological satellite polar system (EPS-SG) C-band-wavelength scatterometer instrument (called SCA), planned for launch in 2022, has a direct heritage from the successful advanced scatterometer (ASCAT) flown on the current EPS satellites. In addition, SCA will represent three major innovations with respect to ASCAT, namely: 1) Cross polarization and horizontal copolarization; 2) a nominal spatial resolution of 25 km; and 3) 20% greater spatial coverage than ASCAT. The associated expected science and application benefits that led the SCA design are discussed with respect to ocean, land, and sea ice applications for near-real time, climate monitoring, and research purposes. Moreover, an option to implement an ocean...
Tipo: Text Palavras-chave: Eddy currents; Radar signal processing; Sea ice; Soil measurements; Storms; Wind.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00386/49774/50320.pdf
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Short time scale changes in underwater irradiance in a wind-exposed lagoon (Vaccares lagoon, France): efficiency of infrequent field measurements of water turbidity or weather data to predict irradiance in the water column ArchiMer
Banas, D; Grillas, P; Auby, Isabelle; Lescuyer, F; Coulet, E; Moreteau, J; Millet, B.
High frequency water sampling in the wind-exposed Vaccares lagoon revealed frequent and rapid changes in suspended solid (SS) concentrations in the water column. SS concentrations, sometimes higher than 800 mg l(-1), were significantly correlated with antecedent wind conditions. Mean wind velocity during the 5-33 h before water sampling or maximal wind velocity during the previous 8.5-22 h were good predictors of SS concentrations in the water column. Underwater irradiance at canopy level was modeled (r(2) = 0.66, n = 7584) using the SS calculated from the relationship between SS and antecedent mean wind velocity and the surface irradiance data measured at the weather station close to the study site. On the other hand, we have shown that in this...
Tipo: Text Palavras-chave: Shallow lagoon; Submerged macrophyte; Wind; Light.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-3690.pdf
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Spatial and temporal characteristics of wind and wind power off the coasts of Brittany ArchiMer
Bentamy, Abderrahim; Croize-fillon, Denis.
The main objective of this paper is to thoroughly examine the remotely sensed wind characteristics around the coasts of Brittany as well as some more specific areas. The offshore wind power potential is then assessed. To achieve this objective, information on wind speed and direction with sufficient spatial and temporal sampling under all weather conditions and during day and night is required. This study uses more than 12 years (December 1999–December 2012) of consistent remotely sensed data retrieved from the ASCAT and QuikSCAT scatterometers to estimate the conventional moments and associated wind distribution parameters. The latter are comparable to wind observations from meteorological stations. Furthermore, combining in-situ and scatterometer wind...
Tipo: Text Palavras-chave: Wind; Energy; Scatterometer; Remote sensing; Brittany.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00175/28648/28552.pdf
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Surges, atmospheric pressure and wind change and flooding probability on the Atlantic coast of France ArchiMer
Pirazzoli, Paolo Antonio.
A statistical study of hourly tide-gauge records at Saint-Gildas, Saint-Nazaire, Port Tudy, Brest, Le Conquet and Roscoff, as well of three-hourly wind and air pressure records at Belie lie and Ouessant over the last 50 years, has made possible the definition of the main meteorological factors which are associated with the development of positive or negative surges. Recent changes in these meteorological factors indicate that atmospheric depressions and strong surge winds are becoming less frequent and that the ongoing trends of climate variability show a decrease in the frequency and hence the gravity of coastal flooding. However the highest sea surges of the last decades did not occur at the time of spring high tide. There is a significant statistical...
Tipo: Text Palavras-chave: Surcote et décote; Vent; Variabilité climatique; Probabilité d'inondation; Côte atlantique française; Surge; Wind; Climate variability; Flooding probability; French Atlantic coast.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43379/42832.pdf
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Survey of stochastic models for wind and sea state time series ArchiMer
Monbet, Valérie; Ailliot, P; Prevosto, Marc.
The knowledge of sea state and wind conditions is of central importance for many offshore and nearshore operations. In this paper, we make a complete survey of stochastic models for sea state and wind time series. We begin with methods based on Gaussian processes, then non-parametric resampling methods for time series are introduced followed by various parametric models. We also propose an original statistical method, based on Monte Carlo goodness-of-fit tests, for model validation and comparison and this method is illustrated on an example of multivariate sea state time series. (C) 2006 Elsevier Ltd. All rights reserved.
Tipo: Text Palavras-chave: Model validation; Simulation; Nonlinear time series; Wind; Sea state.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2679.pdf
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Température, Salinité, Vent, Courantologie des marges du Mor-Bras ArchiMer
Kerdreux, Michel.
In the coastal zone between the estuaries of Loire R. and Vilaine R., IFREMER has made four moorings from february to march and from june to september. The speed and steering of currents are precised, and the temperature and salinity are given. The Direction of national météorologie furnished the date necessary to trace wind speed and steering.
Tipo: Text Palavras-chave: Loire; Vilaine; Courant; Vent; Loire R.; Vilaine R; Current; Wind.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/00081/19270/52489.pdf
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The influence of hydrodynamics on the spatial and temporal variation of phytoplankton pigments in a large, sub-tropical coastal lake (Brazil) BABT
Cardoso,Luciana de Souza; Marques,David da Motta.
This study evaluated the spatial and temporal distribution of phytoplankton pigments in Itapeva Lake and its relationship with hydrodynamic aspects. Regarding spatial distribution, a decreasing N®S gradient was generally observed for the pigments, except in summer. This inversion observed during the summer was influenced by the predominant fetch (N-E). The horizontal heterogeneity was proved (ANOVA) for all seasons of the year, except spring. Spatially in spring, the vertical variance was much more significant (p<0.05) than the horizontal one. The sampling shifts presented a permanent degree of variability among the seasons of the year, showing the existence of a diurnal cycle in the concentration of chlorophyll a. This behavior was related to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pigment; Phytoplankton; Shallow lake; Hydrodynamics; Wind; Bloom.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000400013
Registros recuperados: 24
Primeira ... 12 ... Última
 

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