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Registros recuperados: 6
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Exploring the Benefits of Using CryoSat-2's Cross-Track Interferometry to Improve the Resolution of Multisatellite Mesoscale Fields ArchiMer
Dibarboure, G.; Le Traon, Pierre-yves; Galin, N..
Sea surface height (SSH) measurements provided by pulse-limited radar altimeters are one-dimensional profiles along the satellite's nadir track, with no information whatsoever in the cross-track direction. The anisotropy of resulting SSH profiles is the most limiting factor of mesoscale SSH maps that merge the 1D profiles.This paper explores the potential of the cross-track slope derived from the Cryosphere Satellite-2 (CryoSat-2)'s synthetic aperture radar interferometry (SARin) mode to increase the resolution of mesoscale fields in the cross-track direction. Through idealized 1D simulations, this study shows that it is possible to exploit the dual SARin measurement (cross-track slope and SSH profile) in order to constrain mesoscale mapping in the...
Tipo: Text Palavras-chave: Altimetry; Remote sensing; Sampling; Satellite observations; Interpolation schemes; Inverse methods.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00152/26305/24575.pdf
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Influence of Tropical Instability Waves on Phytoplankton Biomass near the Marquesas Islands ArchiMer
Martinez, Elodie; Raapoto, Hirohiti; Maes, Christophe; Maamaatuaihutapu, Keitapu.
The Marquesas form an isolated group of small islands in the Central South Pacific where quasi-permanent biological activity is observed. During La Niña events, this biological activity, shown by a net increase of chlorophyll-a concentration (Chl, a proxy of phytoplankton biomass), is particularly strong. It has been hypothesized that this strong activity is due to iron-rich waters advected from the equatorial region to the Marquesas by tropical instability waves (TIWs). Here we investigate this hypothesis over 18 years by combining satellite observations, re-analyses of ocean data, and Lagrangian diagnostics. Four La Niña events ranging from moderate to strong intensity occurred during this period, and our results show that the Chl plume within the...
Tipo: Text Palavras-chave: Tropical instability waves; La Nina; Chlorophyll-a concentration variability; Ocean colour; Island mass effect; Marquesas islands; Oceanography; Satellite observations.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00437/54858/56346.pdf
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Observed atlantification of the Barents Sea causes the Polar Front to limit the expansion of winter sea ice ArchiMer
Barton, Benjamin I.; Lenn, Yueng-djern; Lique, Camille.
Barents Sea Water (BSW) is formed from Atlantic Water that is cooled through atmospheric heat loss and freshened through seasonal sea ice melt. In the eastern Barents Sea, the BSW and fresher, colder Arctic Water meet at the surface along the Polar Front (PF). Despite its importance in setting the northern limit of BSW ventilation, the PF has been poorly-documented, mostly eluding detection by observational surveys that avoid seasonal sea ice. In this study, satellite sea surface temperature (SST) observations are used in addition to a temperature and salinity climatology to examine the location and structure of the PF, and characterise its variability over the period 1985 – 2016. It is shown that the PF is independent of the position of the sea ice edge...
Tipo: Text Palavras-chave: Arctic; Sea ice; Fronts; Sea surface temperature; Satellite observations.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00448/56003/57509.pdf
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Partitioning ocean motions into balanced motions and internal gravity waves: A modeling study in anticipation of future space missions ArchiMer
Torres, Hector S.; Klein, Patrice; Menemenlis, Dimitris; Qiu, Bo; Su, Zhan; Wang, Jinbo; Chen, Shuiming; Fu, Lee-lueng.
Internal gravity waves (IGWs) and balanced motions (BMs) with scales < 100‐km capture most of the vertical velocity field in the upper ocean. They have, however, different impacts on the ocean energy budget, which explains the need to partition motions into BMs and IGWs. One way is to exploit the synergy of using different satellite observations, the only observations with global coverage and a reasonable spatial and temporal resolution. But we need first to characterize and understand their signatures on the different surface oceanic fields. This study addresses this issue by using an ocean global numerical simulation with high‐resolution (1/48o). Our methodology is based on the analysis of the 12,000 frequency‐wavenumber spectra to discriminate these...
Tipo: Text Palavras-chave: Oceanic surface motions; Satellite observations; Balanced motions; Internal gravity waves.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00464/57568/59746.pdf
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SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009) ArchiMer
Goubanova, Katerina; Illig, Serena; Machu, Eric; Garcon, Veronique; Dewitte, Boris.
Subseasonal variability of Sea Surface Temperature (SST) in the central Benguela upwelling system is investigated using TMI satellite-derived data over the period 1999-2009. Spatial patterns and time-frequency characteristics of subseasonal variability are documented based on Empirical Orthogonal Functions (EOF) decomposition and wavelet analysis. Despite the land contamination of the TMI satellite data within approximately 100 km off the coast the first EOF of SST anomalies allows characterizing the coastal upwelling variability at the subseasonal scale. Two regimes of variability are evidenced: a submonthly (2-30 days) regime with a dominant 11 days oscillation and a lower frequency intraseasonal (30-90 days) regime with a dominant 61 days oscillation....
Tipo: Text Palavras-chave: Benguela upwelling; Satellite observations; Intraseasonal variability; Wind-SST relationship; Mean vertical stratification; Antarctic oscillation.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00164/27565/25928.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
Registros recuperados: 6
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