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Registros recuperados: 10
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Copolarized and Cross‐Polarized SAR Measurements for High‐Resolution Description of Major Hurricane Wind Structures: Application to Irma Category 5 Hurricane ArchiMer
Mouche, Alexis; Chapron, Bertrand; Knaff, John; Zhao, Yili; Zhang, Biao; Combot, Clement.
C‐Band high resolution radar (SAR) is the only space‐borne instrument able to probe at very high resolution and over all ocean basins the sea surface under extreme weather conditions. When co‐analyzed with Stepped Frequency Microwave Radiometer (SFMR) wind estimates, the radar backscatter signals acquired in major Hurricanes from Sentinel‐1 and Radarsat‐2 SAR, reveal high sensitivity in the cross‐polarized channel for wind speeds up to 75 m/s. The combination of the two co‐ and cross‐ polarized channels can then be used to derive high resolution surface wind estimates. The retrieval methods and impacts of intense rainfall are discussed in the context of a Hurricane Irma (2017) case study. On September 7, 2017, Sentinel‐1 measurements intercepted Hurricane...
Tipo: Text Palavras-chave: SAR; Copolarization and cross-polarization; High resolution; Category 5 Hurricane; Hurricane Irma.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00497/60898/64236.pdf
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Desenvolvimento de método por CLUE-EM-EM para detecção de adulterantes em café. Repositório Alice
MARTINS, V. C.; GODOY, R. L. de O.; GOUVÊA, A. C. M. S.; SANTIAGO, M. C. P. de A.; COUTO, C. C.; FREITAS-SILVA, O..
2016
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Fraudes; Identificação; Fragmentação; Alta resolução; Frauds; Identification; Fragmentation; High resolution.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1059092
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Editorial: New Insights into Microbial Ecology through Subtle Nucleotide Variation ArchiMer
Eren, A. Murat; Sogin, Mitchell L.; Maignien, Lois.
Tipo: Text Palavras-chave: Oligotyping; Minimum entropy decomposition; 16S rRNA gene; Microbial ecology; High resolution.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00601/71310/69739.pdf
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High resolution seismic imaging of the ocean structure using a small volume airgun source array in the Gulf of Cadiz ArchiMer
Geli, Louis; Cosquer, Emmanuel; Hobbs, R. W.; Klaeschen, D.; Papenberg, C.; Thomas, Yannick; Menesguen, Claire; Hua, Bach-lien.
A small volume (117 cu-inch) seismic source producing signal predominantly in the 150-200 Hz frequency window was used during the GO calibration experiment in the Gulf of Cadiz (April-May 2007). The data show the small scale (< 10 m in the z direction) internal structure of the ocean. High-resolution images display seismic reflectors that often appear as distinct, horizontal, short (similar to a few hundred meters to a few km long) segments, lying at different depths, while low-resolution (similar to 20 to 30 Hz) display long, horizontal reflectors (similar to a few tens of km), sometimes linked by short, apparently "dipping" segments. The present data suggest that this apparent dipping effect is due to the insufficient separation power (similar to...
Tipo: Text Palavras-chave: High resolution; Seismics; Oceanography.
Ano: 2009 URL: https://archimer.ifremer.fr/doc/2009/publication-7297.pdf
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Intense deformation field at oceanic front inferred from directional sea surface roughness observations ArchiMer
Rascle, Nicolas; Molemaker, Jeroen; Marie, Louis; Nouguier, Frederic; Chapron, Bertrand; Lund, Bjorn; Mouche, Alexis.
Fine scale current gradients at the ocean surface can be observed by sea surface roughness. More specifically, directional surface roughness anomalies are related to the different horizontal current gradient components. This paper reports results from a dedicated experiment during the LASER (LAgrangian Submesoscale ExpeRiment) drifter deployment. A very sharp front, 50 m wide, is detected simultaneously in drifter trajectories, sea surface temperature and sea surface roughness. A new observational method is applied, using sun glitter reflections during multiple airplane passes to reconstruct the multi-angle roughness anomaly. This multi-angle anomaly is consistent with wave-current interactions over a front, including both cross-front convergence and...
Tipo: Text Palavras-chave: Sea surface roughness; Surface current; Remote sensing; Sun glitter; High resolution; Oceanic fronts.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00386/49767/50301.pdf
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Low-cost multi-spectral camera platform for in-flight near real-time vegetation index computation and delivery. Repositório Alice
MENDONÇA, L. D. de; ARROYAVE, C. G. C.;  LIMA, E. R. de; VICENTE, L. E..
Agricultural optimization and increased productivity is always a growing concern, due to the increasing population. Crops susceptible to a wide variety of hindering conditions, need to be carefully observed and managed to guarantee maximum production. Many diseases, weather changes, soil variances and other in?uencing factors are only visible after the plant has reached a deplorable state and its neighbors closely trailing behind. Ongoing research is enhancing an observation model that can better prevent such factors, but many still present a variety of limiting factors that are still being studied. Vegetation indices is a long dated studied concept that has proven to be able to show plant response to stress before visible signs are present. To take...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: High resolution; Processamento de imagens; Alta resolução; Sensoriamento remoto; Remote sensing; Imagem analysis; Vegetation index.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1084542
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Mass spectrometry screening of Arabica coffee roasting: A non-target and non-volatile approach by EASI-MS and ESI-MS. Repositório Alice
ROSA, J. S. da; FREITAS-SILVA, O.; ROUWS, J. R. C.; MOREIRA, I. G. da S.; NOVAES, F. J. M.; AZEVEDO, D. de A.; SCHWAB, N.; GODOY, R. L. de O.; EBERLIN, M. N.; REZENDE, C. M. de.
Coffee roasting needs precise control and innovative techniques that are economically viable to monitor and improve its consistency. In this study, mass spectrometry was used as a tool to screen chemical markers that appear on the surface of coffee beans (whole bean) along the roasting process. A non-target and non-volatile approach was used with an ambient technique (EASI) coupled to a single quadrupole mass analyzer to monitor roasting chemical changes in the coffee bean. Green (raw), soft, medium, dark and very dark roasted coffee beans showed a decrease in ions in the range of m/z 500?600, whereas an increase in abundance in the m/z 800?900 range was clearly observed in the most roasted coffees. A multivariate approach through PCA separated the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Tryptamides; High resolution; Roast consistency; Café arábica; Espectrometria de massa; Espectrometria; Tecnologia de Alimento; Torrefação; Café; Diacylglycerols; Fluorescence; Triacylglycerols; Mass spectrometry; Roasting; Food technology.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1056560
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Ocean Gravity Models From Future Satellite Missions ArchiMer
Louis, Gilles; Lequentrec-lalancette, Marie-françoise; Royer, Jean-yves; Rouxel, Didier; Géli, Louis; Maïa, Marcia; Faillot, Mathilde.
Over the past 3 decades, satellite altimetry has been a key tool for dynamic ocean studies and for accurately estimating sea surface heights. The geodetic reference surface—the “geoid”—can be approximated as the mean sea surface height of an ocean corrected for dynamic terms such as tides and currents. It is an equipotential surface of the gravity field; and variations of this field are quantified as free‐air anomalies, from which density heterogeneities of the oceanic basement can be inferred. Using such data in combination with other geophysical data, scientists have improved their knowledge of the nature of submarine relief and underlying structures. In solid Earth geophysics, major breakthroughs came from the development of high‐resolution marine...
Tipo: Text Palavras-chave: Altimetry; High resolution; SWAT soil and water assessment tool.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00451/56260/57829.pdf
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Potential of High Spatial and Temporal Ocean Color Satellite Data to Study the Dynamics of Suspended Particles in a Micro-Tidal River Plume ArchiMer
Ody, Anouck; Doxaran, David; Vanhellemont, Quinten; Nechad, Bouchra; Novoa, Stefani; Many, Gael; Bourrin, Francois; Verney, Romaric; Pairaud, Ivane; Gentili, Bernard.
Ocean color satellite sensors are powerful tools to study and monitor the dynamics of suspended particulate matter (SPM) discharged by rivers in coastal waters. In this study, we test the capabilities of Landsat-8/Operational Land Imager (OLI), AQUA&TERRA/Moderate Resolution Imaging Spectroradiometer (MODIS) and MSG-3/Spinning Enhanced Visible and Infrared Imager (SEVIRI) sensors in terms of spectral, spatial and temporal resolutions to (i) estimate the seawater reflectance signal and then SPM concentrations and (ii) monitor the dynamics of SPM in the Rhone River plume characterized by moderately turbid surface waters in a micro-tidal sea. Consistent remote-sensing reflectance (Rrs) values are retrieved in the red spectral bands of these four satellite...
Tipo: Text Palavras-chave: River plumes; Coastal waters; High resolution; Suspended particulate matter; Remote sensing.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00333/44408/44066.pdf
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Wave spectrum retrieval from airborne sunglitter images ArchiMer
Yurovskaya, Maria; Rascle, Nicolas; Kudryavtsev, Vladimir; Chapron, Bertrand; Marie, Louis; Molemaker, Jeroen.
Reconstruction and evolution of two-dimensional spectra of surface waves in the Gulf of Mexico are derived from airborne sun-glitter imagery. As the proposed method is based on a linear transfer function deduced from the shape of the sunglitter brightness, the absolute wavenumber elevation spectrum does not require any additional assumption or information about sky brightness, wind or wave energy. The detailed description of the airborne image processing method is given. As demonstrated, retrieved spectra agree well with nearby NDBC buoy data, both for spectrum shape, level and energy angular distribution. The 180-degree wave direction ambiguity, inherent to image-derived spectra, is eliminated by using cross-correlation analysis between two consecutive...
Tipo: Text Palavras-chave: Sunglitter; Sea surface waves; Directional wave spectrum; Aerial photography; Field measurements; Remote sensing observations; High resolution; Drone.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00465/57712/60174.pdf
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