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Registros recuperados: 11
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A global comparison of Argo and satellite altimetry observations ArchiMer
Dhomps, A. -l.; Guinehut, S.; Le Traon, Pierre-yves; Larnicol, Gilles.
Differences, similarities and complementarities between Sea Level Anomalies (SLA) deduced from altimeter measurements and dynamic height anomalies (DHA) calculated from Argo in situ temperature (T) and salinity (S) profiles are globally analyzed. SLA and DHA agree remarkably well and, compared to previous studies, Argo dataset allows an improvement in the coherence between SLA and DHA. Indeed, Argo data provides a much better spatial coverage of all oceans and particularly the Southern Ocean, the use of an Argo mean dynamic height, the use of measured salinity profiles (versus climatological salinity), and the use of a deeper reference level (1000 m versus 700 m). The large influence of Argo salinity observations on the consistency between altimetry and...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00035/14630/11930.pdf
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Data assembly and processing for operational oceanography 10 years of achievements ArchiMer
Le Traon, Pierre-yves; Larnicol, Gilles; Guinehut, Stephanie; Pouliquen, Sylvie; Bentamy, Abderrahim; Roemmich, Dean; Donlon, Craig; Roquet, Herve; Jacobs, Gregg; Griffin, David; Bonjean, Fabrice; Hoepffner, Nicolas; Breivik, Lars-anders.
Data assembly and processing centers are essential elements of the operational oceanography infrastructure. They provide data and products needed by modeling and data assimilation systems; they also provide products directly usable for applications. This paper discusses the role and functions of the data centers for operational oceanography. It describes some of the main data assembly centers (Argo and in situ data, altimetry, sea surface temperature) developed during the Global Ocean Data Assimilation Experiment. An overview of other data centers (wind and fluxes, ocean color, sea ice) is also given. Much progress has been achieved over the past 10 years to validate, intercalibrate, and merge altimeter data from multiple satellites. Accuracy and...
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Ano: 2009 URL: https://archimer.ifremer.fr/doc/2009/publication-6879.pdf
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High resolution 3-D temperature and salinity fields derived from in situ and satellite observations ArchiMer
Guinehut, Stephanie; Dhomps, Anne-lise; Larnicol, Gilles; Le Traon, Pierre-yves.
This paper describes an observation-based approach that efficiently combines the main components of the global ocean observing system using statistical methods. Accurate but sparse in situ temperature and salinity profiles (mainly from Argo for the last 10 yr) are merged with the lower accuracy but high-resolution synthetic data derived from satellite altimeter and sea surface temperature observations to provide global 3-D temperature and salinity fields at high temporal and spatial resolution. The first step of the method consists in deriving synthetic temperature fields from altimeter and sea surface temperature observations, and salinity fields from altimeter observations, through multiple/simple linear regression methods. The second step of the method...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00117/22800/20607.pdf
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Improved description of the ocean mesoscale variability by combining four satellite altimeters - art. no. L02611 ArchiMer
Pascual, Ananda; Faugere, Yannice; Larnicol, Gilles; Le Traon, Pierre-yves.
Data from four satellite altimeters are combined with the aim of improving the representation of the mesoscale variability in the Global Ocean. All missions [Jason-1, ERS-2/ENVISAT, Topex/Poseidon interleaved with Jason-1 and Geosat Follow-On] are cross-calibrated previously to produce weekly gridded maps. In areas of intense variability, the rms differences between a classical configuration of two altimeters and the scenario merging four missions can reach 10 cm and 400 cm(2)/s(2) in SLA and EKE, respectively, which represents an important percentage of the signal variance. A comparison with surface drifters shows that the four altimeter scenario improves the recovery of mesoscale structures that were not properly sampled with Jason(-1) + ERS-2/ENVISAT....
Tipo: Text Palavras-chave: Satellite altimeters; Mesoscale variability; Global ocean.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1038.pdf
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Jason-2 in DUACS: Updated System Description, First Tandem Results and Impact on Processing and Products ArchiMer
Dibarboure, G.; Pujol, M. -i.; Briol, F.; Le Traon, Pierre-yves; Larnicol, Gilles; Picot, Nicolas; Mertz, F.; Ablain, M..
For more than 13 years, the multisatellite DUACS system has been providing the altimetry community with Near Real Time and Delayed Time products ranging from reduced GDR (also known as CorrSSH) to along-track Sea Level Anomalies (SLA) and multimission Maps of Sea Level Anomalies (MSLA). A post-Jason-2 description of the DUACS system is given, with input data, processing and products, and a focus on the DT-2010 reprocessing involving a total of almost 60 years worth of altimetry data from GEOSAT to Jason-2. Less than one month after launch, Jason-2 proved to be a strong asset for multisatellite applications as it was able to replace Jason-1 as the reference mission in DUACS. Furthermore, the new Jason-2/Jason-1 tandem configuration provides an unprecedented...
Tipo: Text Palavras-chave: Jason-2; DUACS; Multimission; Altimetry; DFS; Cross-calibration; Reference mission; Jason tandem.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00057/16791/14366.pdf
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Mean sea level and surface circulation variability of the Mediterranean Sea from 2 years of TOPEX/POSEIDON altimetry ArchiMer
Larnicol, Gilles; Le Traon, Pierre-yves; Ayoub, N; Demey, P.
We describe the circulation and mean sea lever variations of the Mediterranean Sea from 2 years of TOPEX/POSEIDON altimetric data. It is first shown that the response of the Mediterranean Sea to atmospheric pressure forcing is close to an inverse barometer (except at high frequencies) which means that the adjustment is accompanied by a flow through the Straits of Sicily and Gibraltar. We then use TOPEX/POSEIDON to study the mean sea level variations, representing steric effects and integrated large-scale changes of the mass of the Mediterranean Sea. We observe an annual cycle with a fast drop during winter, Steric effects account for about half of the observed variations. The remaining signal is believed to be driven by evaporation minus precipitation (E -...
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Ano: 1995 URL: http://archimer.ifremer.fr/doc/00079/18979/16625.pdf
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Observing system evaluations using GODAE systems ArchiMer
Oke, Peter R.; Balmaseda, Magdalena A.; Benkiran, Mounir; Cummings, James A.; Dombrowsky, Eric; Fujii, Yosuke; Guinehut, Stéphanie; Larnicol, Gilles; Le Traon, Pierre-yves; Martin, Matthew J..
Global ocean forecast systems, developed under the Global Ocean Data Assimilation Experiment (GODAE), are a powerful means of assessing the impact of different components of the Global Ocean Observing System (GOOS). Using a range of analysis tools and approaches, GODAE systems are useful for quantifying the impact of different observation types on the quality of analyses and forecasts. This assessment includes both existing and future observation platforms. Many important conclusions can be drawn from these studies. It is clear that altimeter data are extremely important for constraining mesoscale variability in ocean forecast systems. The number of altimeters is also important. For example, near-real-time applications need data from four altimeters to...
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Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6813.pdf
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Polar Ocean Observations: A Critical Gap in the Observing System and Its Effect on Environmental Predictions From Hours to a Season ArchiMer
Smith, Gregory C.; Allard, Richard; Babin, Marcel; Bertino, Laurent; Chevallier, Matthieu; Corlett, Gary; Crout, Julia; Davidson, Fraser; Delille, Bruno; Gille, Sarah T.; Hebert, David; Hyder, Patrick; Intrieri, Janet; Lagunas, Jose; Larnicol, Gilles; Kaminski, Thomas; Kater, Belinda; Kauker, Frank; Marec, Claudie; Mazloff, Matthew; Metzger, E. Joseph; Mordy, Calvin; O'Carroll, Anne; Olsen, Steffen M.; Phelps, Michael; Posey, Pamela; Prandi, Pierre; Rehm, Eric; Reid, Phillip; Rigor, Ignatius; Sandven, Stein; Shupe, Matthew; Swart, Sebastiaan; Smedstad, Ole Martin; Solomon, Amy; Storto, Andrea; Thibaut, Pierre; Toole, John; Wood, Kevin; Xie, Jiping; Yang, Qinghua.
There is a growing need for operational oceanographic predictions in both the Arctic and Antarctic polar regions. In the former, this is driven by a declining ice cover accompanied by an increase in maritime traffic and exploitation of marine resources. Oceanographic predictions in the Antarctic are also important, both to support Antarctic operations and also to help elucidate processes governing sea ice and ice shelf stability. However, a significant gap exists in the ocean observing system in polar regions, compared to most areas of the global ocean, hindering the reliability of ocean and sea ice forecasts. This gap can also be seen from the spread in ocean and sea ice reanalyses for polar regions which provide an estimate of their uncertainty. The...
Tipo: Text Palavras-chave: Polar observations; Operational oceanography; Ocean data assimilation; Ocean modeling; Forecasting; Sea ice; Air-sea-ice fluxes; YOPP.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00512/62379/66650.pdf
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Synthesis of new scientific challenges for GODAE OceanView ArchiMer
Schiller, Andreas; Bell, Mike; Brassington, Gary; Brasseur, Pierre; Barciela, Rosa; De Mey, Pierre; Dombrowsky, Eric; Gehlen, Marion; Hernandez, Fabrice; Kourafalou, Villy; Larnicol, Gilles; Le Traon, Pierre-yves; Martin, Matthew; Oke, Peter; Smith, Gregory C.; Smith, Neville; Tolman, Hendrik; Wilmer-becker, Kirsten.
The marine environment plays an increasingly important role in shaping economies and infrastructures, and touches upon many aspects of our lives, including food supplies, energy resources, national security and recreational activities. Global Ocean Data Assimilation Experiment (GODAE) and GODAE OceanView have provided platforms for international collaboration that significantly contribute to the scientific development and increasing uptake of ocean forecasting products by end users who address societal issues such as those listed above. Many scientific challenges and opportunities remain to be tackled in the ever-changing field of operational oceanography, from the observing system to modelling, data assimilation and product dissemination. This paper...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00284/39522/38015.pdf
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The potential of the maximum cross-correlation technique to estimate surface currents from thermal AVHRR global area coverage data ArchiMer
Dransfeld, Steffen; Larnicol, Gilles; Le Traon, Pierre-yves.
Having already shown its potential of deriving the vector fields representing the ocean-surface advection from sequential 1.1-km-resolution local area coverage (LAC) Advanced Very High Resolution Radiometer (AVHRR) images, the maximum cross-correlation (MCC) technique here is applied to four 4.4-km-resolution global area coverage (GAC) AVHRR images. The resulting three vector fields are compared to the vector fields obtained from the LAC imagery corresponding to the same satellite passages. To quantify the reduction in accuracy inevitable when applying the method to the lower resolution imagery, the LAC vector fields were assumed to be error free. The deviation of the GAC vectors from the LAC vectors is expressed as percentage errors of the signal variance...
Tipo: Text Palavras-chave: Remote sensing; Marine technology; Infrared imaging; Image motion.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2319.pdf
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Use of satellite observations for operational oceanography: recent achievements and future prospects ArchiMer
Le Traon, Pierre-yves; Antoine, D.; Bentamy, Abderrahim; Bonekamp, H.; Breivik, L. A.; Chapron, Bertrand; Corlett, G.; Dibarboure, G.; Digiacomo, P.; Donlon, C.; Faugere, Y.; Font, J.; Girard-ardhuin, Fanny; Gohin, Francis; Johannessen, J. A.; Kamachi, M.; Lagerloef, G.; Lambin, J.; Larnicol, Gilles; Le Borgne, P.; Leuliette, E.; Lindstrom, E.; Martin, M. J.; Maturi, E.; Miller, L.; Mingsen, L.; Morrow, R.; Reul, Nicolas; Rio, Myriam; Roquet, H.; Santoleri, R.; Wilkin, J..
The paper gives an overview of the development of satellite oceanography over the past five years focusing on the most relevant issues for operational oceanography. Satellites provide key essential variables to constrain ocean models and/or serve downstream applications. New and improved satellite data sets have been developed and have directly improved the quality of operational products. The status of the satellite constellation for the last five years was, however, not optimal. Review of future missions shows clear progress and new research and development missions with a potentially large impact for operational oceanography should be demonstrated. Improvement of data assimilation techniques and developing synergetic use of high resolution satellite...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00270/38094/36245.pdf
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