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Registros recuperados: 8
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Global Observations of Fine-Scale Ocean Surface Topography With the Surface Water and Ocean Topography (SWOT) Mission ArchiMer
Morrow, Rosemary; Fu, Lee-lueng; Ardhuin, Fabrice; Benkiran, Mounir; Chapron, Bertrand; Cosme, Emmanuel; D’ovidio, Francesco; Farrar, J. Thomas; Gille, Sarah T.; Lapeyre, Guillaume; Le Traon, Pierre-yves; Pascual, Ananda; Ponte, Aurelien; Qiu, Bo; Rascle, Nicolas; Ubelmann, Clement; Wang, Jinbo; Zaron, Edward D..
The future international Surface Water and Ocean Topography (SWOT) Mission, planned for launch in 2021, will make high-resolution 2D observations of sea-surface height using SAR radar interferometric techniques. SWOT will map the global and coastal oceans up to 77.6∘ latitude every 21 days over a swath of 120 km (20 km nadir gap). Today’s 2D mapped altimeter data can resolve ocean scales of 150 km wavelength whereas the SWOT measurement will extend our 2D observations down to 15–30 km, depending on sea state. SWOT will offer new opportunities to observe the oceanic dynamic processes at scales that are important in the generation and dissipation of kinetic energy in the ocean, and that facilitate the exchange of energy between the ocean interior and the...
Tipo: Text Palavras-chave: Ocean mesoscale circulation; Satellite altimetry; SAR-interferometry; Tides and internal tides; Calibration-validation.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00495/60685/64181.pdf
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High Resolution Altimetry Reveals New Characteristics of the December 2004 Indian Ocean Tsunami ArchiMer
Ablain, Michaël; Dorandeu, Joël; Le Traon, Pierre-yves; Sladen, Anthony.
The Indian Ocean tsunami, which occurred on December 26, 2004, was the first to be clearly observed using satellite altimeters. The wave amplitude observed in deep-ocean by TOPEX and Jason-1 was close to 60 cm about 2 hours after the earthquake. Envisat crossed the tsunami wave 3h15 after the earthquake and measured a 35 cm wave. Even though it flew over the tsunami 7h20 after the earthquake, GFO still observed a wave close to 20 cm. To better extract the tsunami signal from altimeter measurements, a specific ocean variability mapping technique is used. This technique proves to be mandatory for discriminating tsunami waves from other ocean signals. Altimeter signals are then compared with those derived from the CEA (Commissariat à l'Energie Atomique) model...
Tipo: Text Palavras-chave: Wave analysis; Tsunamis; Earthquakes; Sea level changes; Satellite altimetry.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1174.pdf
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Improvements to estimating the air-sea gas transfer velocity by using dual-frequency, altimeter backscatter ArchiMer
Goddijn-murphy, Lonneke; Woolf, David; Chapron, Bertrand; Queffeulou, Pierre.
Air-sea gas exchange is affected by sea surface roughness and a previous study shows a significant relation between Ku-band backscattering from satellite altimeters and field estimates of gas transfer velocity, K. Recently C-band backscatter data were made available for altimeters on board the JASON-1 and JASON-2 satellites. In this paper we used experimental data from the same cruises to show that using the difference between the Ku-band and C-band signals to estimate sea surface roughness, and thus reducing the contribution from longer waves, improved the K estimates. This is consistent with the theory that gas transfer is largely controlled by short capillary-gravity waves. For satellite data closer than 2 hr and 0.5 degrees from the K sample stations,...
Tipo: Text Palavras-chave: Air-sea gas transfer; Satellite altimetry; DMS.
Ano: 2013 URL: https://archimer.ifremer.fr/doc/00174/28564/26980.pdf
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Observed Characteristics and Vertical Structure of Mesoscale Eddies in the Southwest Tropical Pacific ArchiMer
Keppler, Lydia; Cravatte, Sophie; Chaigneau, Alexis; Pegliasco, Cori; Gourdeau, Lionel; Singh, Awnesh.
In the Southwest Pacific Ocean, waters transit from the subtropical gyre before being redistributed equatorward and poleward. While the mean pathways are known, the contribution to the mixing and transport of the water from mesoscale eddies has not been comprehensively investigated. In this research, satellite altimetry data, combined with an eddy detection and tracking algorithm is used to investigate the distribution and surface characteristics of mesoscale eddies in this region of complex bathymetry (10 degrees S-30 degrees S, 140 degrees E-190 degrees E). Detected eddies are then colocalized with in situ data from Argo floats to determine their vertical structure and the effect of eddies on the water masses. The numerous islands affect the eddy...
Tipo: Text Palavras-chave: Mesoscale eddies; Southwest Pacific; Argo floats; Satellite altimetry.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00489/60039/63314.pdf
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Recent advances in observing mesoscale ocean dynamics with satellite altimetry ArchiMer
Morrow, Rosemary; Le Traon, Pierre-yves.
The paper provides a review of recent results on mesoscale ocean dynamics derived from satellite altimetry. Since 1992, we have had an unprecedented 18 year high-resolution monitoring of the ocean mesoscale field. Altimetry is often used in mesoscale studies in synergy with other remote sensing techniques and in situ data. This global, high-resolution data set has allowed oceanographers to quantify the previously unknown seasonal and interannual variations in eddy kinetic energy and eddy heat and salt transports, and investigate their causes. Eddy tracking techniques have allowed us to monitor their propagation pathways, to bring to light the meridional divergence of cyclones and anticyclones, and to question the role of Rossby waves versus non-linear...
Tipo: Text Palavras-chave: Satellite altimetry; Mesoscale eddies; Ocean circulation.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00087/19847/17767.pdf
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Satellite altimetry and ocean dynamics ArchiMer
Fu, Lee Lueng; Le Traon, Pierre-yves.
This paper provides a summary of recent results derived from satellite altimetry. It is focused on altimetry and ocean dynamics with synergistic use of other remote sensing techniques, in-situ data and integration aspects through data assimilation. Topics include mean ocean circulation and geoid issues, tropical dynamics and large-scale sea level and ocean circulation variability, high-frequency and intraseasonal variability, Rossby waves and mesoscale variability.
Tipo: Text Palavras-chave: Rossby waves; Large scale; Mesoscale; Sea level; Ocean dynamics; Satellite altimetry; Ondes de Rossby; Grande échelle; Mésoéchelle; Niveau de la mer; Dynamique de l'océan; Altimétrie satellitaire.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2175.pdf
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Ships going slow in reducing their NOx emissions: changes in 2005-2012 ship exhaust inferred from satellite measurements over Europe ArchiMer
Boersma, K. Folkert; Vinken, Geert C. M.; Tournadre, Jean.
We address the lack of temporal information on ship emissions, and report on rapid short-term variations of satellite-derived ship NOx emissions between 2005 and 2012 over European seas. Our inversion is based on OMI observed tropospheric NO2 columns and GEOS-Chem simulations. Average European ship NOx emissions increased by similar to 15% from 2005 to 2008. This increase was followed by a reduction of similar to 12% in 2009, a direct result of the global economic downturn in 2008-2009, and steady emissions from 2009 to 2012. Observations of ship passages through the Suez Canal and satellite altimeter derived ship densities suggests that ships in the Mediterranean Sea have reduced their speed by more than 30% since 2008. This reduction in ship speed is...
Tipo: Text Palavras-chave: Ship emissions; Air pollution; NOx emissions; Satellite altimetry; OMI; Europe.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00307/41790/40994.pdf
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Transport and variability of the antarctic circumpolar current South of Africa ArchiMer
Swart, S; Speich, Sabrina; Ansorge, I; Goni, G; Gladyshev, S; Lutjeharms, J.
Data from five CTD and 18 XBT sections are used to estimate the baroclinic transport ( referenced to 2500 dbar) of the ACC south of Africa. Surface dynamic height is derived from XBT data by establishing an empirical relationship between vertically integrated temperature and surface dynamic height calculated from CTD data. This temperature-derived dynamic height data compare closely with dynamic heights calculated from CTD data ( average RMS difference = 0.05 dyn m). A second empirical relationship between surface dynamic height and cumulative baroclinic transport is defined, allowing us to study a more extensive time series of baroclinic transport derived from upper ocean temperature sections. From 18 XBT transects of the ACC, the average baroclinic...
Tipo: Text Palavras-chave: Satellite altimetry; Antarctic Circumpolar Current; Baroclinic transport.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4700.pdf
Registros recuperados: 8
Primeira ... 1 ... Última
 

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