Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 33
Primeira ... 12 ... Última
Imagem não selecionada

Imprime registro no formato completo
A new generation of Tropical Cyclone Size measurements from space ArchiMer
Reul, Nicolas; Chapron, Bertrand; Zabolotskikh, E.; Donlon, C.; Mouche, Alexis; Tenerelli, Joseph; Collard, F.; Piolle, Jean-francois; Fore, A.; Yueh, S.; Cotton, J.; Francis, P.; Quilfen, Yves; Kudryavtsev, V..
Combined microwave brightness temperature measurements from recent L- and dual C-band satellite radiometers provide new estimates of surface wind speed structure in Tropical Cyclones which enhances temporal sampling capability for gale (34-knots), damaging (50-knots) and destructive (64-knots) wind radii. Wind radii estimates in Tropical Cyclones (TC) are crucial to help determine the TC wind structure for the production of effective warnings and to constrain initial conditions for a number of applications. In that context, we report on the capabilities of a new generation of satellite microwave radiometers operating at L-band frequency (~1.4 GHz) and dual C-band (~6.9 and 7.3 GHz). These radiometers provide wide swath (> 1000 km) coverage at a spatial...
Tipo: Text
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00376/48758/49151.pdf
Imagem não selecionada

Imprime registro no formato completo
A revised L-band radio-brightness sensitivity to extreme winds under tropical cyclones: The 5 year SMOS-Storm database ArchiMer
Reul, Nicolas; Chapron, Bertrand; Zabolotskikh, E.; Donlon, C.; Quilfen, Yves; Guimbard, Sebastien; Piolle, Jean-francois.
Five years of SMOS L-band brightness temperature data intercepting a large number of tropical cyclones (TCs) are analyzed. The storm-induced half-power radio-brightness contrast (ΔI) is defined as the difference between the brightness observed at a specific wind force and that for a smooth water surface with the same physical parameters. ΔI can be related to surface wind speed and has been estimated for ~ 300 TCs that intercept with SMOS measurements. ΔI, expressed in a common storm-centric coordinate system, shows that mean brightness contrast monotonically increases with increased storm intensity ranging from ~ 5 K for strong storms to ~ 24 K for the most intense Category 5 TCs. A remarkable feature of the 2D mean ΔI fields and their variability is that...
Tipo: Text
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00324/43542/43178.pdf
Imagem não selecionada

Imprime registro no formato completo
A simplified model for the baroclinic and barotropic ocean response to moving tropical cyclones: 1. Satellite Observations ArchiMer
Kudryavtsev, Vladimir; Monzikova, Anna; Combot, Clement; Chapron, Bertrand; Reul, Nicolas; Quilfen, Yves.
Changes of sea surface temperature (SST) and height (SSH) derived from 20‐days passive microwave and altimeter measurements for three tropical cyclones (TCs), Jimena, Ignacio and Kilo, during the 2015 Pacific hurricane season, sampling different stages of intensification, wind speeds, radii, Coriolis parameter, translation velocities, and ocean stratification conditions, are reported and analyzed. As triggered along the path of moving TCs, very large interior ocean displacements can occur to leave prominent SSH anomalies in the TC wake. Resulting surface depressions can reach.3‐.5 m, depending upon size, translation speed, and ocean stratification conditions. These signatures can be quite persistent, i.e. more than few weeks, to possibly be intercepted...
Tipo: Text Palavras-chave: Tropical cyclones; Surface temperature anomalies; Surface height anomalies.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00491/60252/63653.pdf
Imagem não selecionada

Imprime registro no formato completo
Altimeter dual-frequency observations of surface winds, waves, and rain rate in tropical cyclone Isabel - art. no. C01004, ArchiMer
Quilfen, Yves; Tournadre, Jean; Chapron, Bertrand.
[1] Extreme weather events such as tropical cyclones are difficult to observe with conventional means. Satellite-based observations provide essential measurements of key parameters governing tropical cyclones. They are critical for short-term forecasting. Radiometers onboard the Defense Meteorological Satellite Program satellite series, WindSat and Tropical Rainfall Measuring Mission satellites, scatterometers onboard the ERS, ADEOS, and QuikScat satellites offer unprecedented synoptic observations of surface wind and atmospheric liquid water content, revealing the storm structures with good accuracy. However, satellite estimates do not provide direct measurements of geophysical parameters and can suffer from limitations linked to the sensors...
Tipo: Text Palavras-chave: Mesearement limitations; Dual frequency altimeter; High resolution measurement; Tropical cyclone.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1033.pdf
Imagem não selecionada

Imprime registro no formato completo
Altimetry for the future: Building on 25 years of progress ArchiMer
Abdalla, Saleh; Abdeh Kolahchi, Abdolnabi; Adusumilli, Susheel; Aich Bhowmick, Suchandra; Alou-font, Eva; Amarouche, Laiba; Andersen, Ole Baltazar; Antich, Helena; Aouf, Lotfi; Arbic, Brian; Armitage, Thomas; Arnault, Sabine; Artana, Camila; Aulicino, Giuseppe; Ayoub, Nadia; Badulin, Sergei; Baker, Steven; Banks, Chris; Bao, Lifeng; Barbetta, Silvia; Barceló-llull, Bàrbara; Barlier, François; Basu, Sujit; Bauer-gottwein, Peter; Becker, Matthias; Beckley, Brian; Bellefond, Nicole; Belonenko, Tatyana; Benkiran, Mounir; Benkouider, Touati; Bennartz, Ralf; Benveniste, Jérôme; Bercher, Nicolas; Berge-nguyen, Muriel; Bettencourt, Joao; Blarel, Fabien; Blazquez, Alejandro; Blumstein, Denis; Bonnefond, Pascal; Borde, Franck; Bouffard, Jérôme; Boy, François; Boy, Jean-paul; Brachet, Cédric; Brasseur, Pierre; Braun, Alexander; Brocca, Luca; Brockley, David; Brodeau, Laurent; Brown, Shannon; Bruinsma, Sean; Bulczak, Anna; Buzzard, Sammie; Cahill, Madeleine; Calmant, Stéphane; Calzas, Michel; Camici, Stefania; Cancet, Mathilde; Capdeville, Hugues; Carabajal, Claudia Cristina; Carrere, Loren; Cazenave, Anny; Chassignet, Eric P.; Chauhan, Prakash; Cherchali, Selma; Chereskin, Teresa; Cheymol, Cecile; Ciani, Daniele; Cipollini, Paolo; Cirillo, Francesca; Cosme, Emmanuel; Coss, Steve; Cotroneo, Yuri; Cotton, David; Couhert, Alexandre; Coutin-faye, Sophie; Crétaux, Jean-françois; Cyr, Frederic; D’ovidio, Francesco; Darrozes, José; David, Cedric; Dayoub, Nadim; De Staerke, Danielle; Deng, Xiaoli; Desai, Shailen; Desjonqueres, Jean-damien; Dettmering, Denise; Di Bella, Alessandro; Díaz-barroso, Lara; Dibarboure, Gerald; Dieng, Habib Boubacar; Dinardo, Salvatore; Dobslaw, Henryk; Dodet, Guillaume; Doglioli, Andrea; Domeneghetti, Alessio; Donahue, David; Dong, Shenfu; Donlon, Craig; Dorandeu, Joël; Drezen, Christine; Drinkwater, Mark; Du Penhoat, Yves; Dushaw, Brian; Egido, Alejandro; Erofeeva, Svetlana; Escudier, Philippe; Esselborn, Saskia; Exertier, Pierre; Fablet, Ronan; Falco, Cédric; Farrell, Sinead Louise; Faugere, Yannice; Femenias, Pierre; Fenoglio, Luciana; Fernandes, Joana; Fernández, Juan Gabriel; Ferrage, Pascale; Ferrari, Ramiro; Fichen, Lionel; Filippucci, Paolo; Flampouris, Stylianos; Fleury, Sara; Fornari, Marco; Forsberg, Rene; Frappart, Frédéric; Frery, Marie-laure; Garcia, Pablo; Garcia-mondejar, Albert; Gaudelli, Julia; Gaultier, Lucile; Getirana, Augusto; Gibert, Ferran; Gil, Artur; Gilbert, Lin; Gille, Sarah; Giulicchi, Luisella; Gómez-enri, Jesús; Gómez-navarro, Laura; Gommenginger, Christine; Gourdeau, Lionel; Griffin, David; Groh, Andreas; Guerin, Alexandre; Guerrero, Raul; Guinle, Thierry; Gupta, Praveen; Gutknecht, Benjamin D.; Hamon, Mathieu; Han, Guoqi; Hauser, Danièle; Helm, Veit; Hendricks, Stefan; Hernandez, Fabrice; Hogg, Anna; Horwath, Martin; Idžanović, Martina; Janssen, Peter; Jeansou, Eric; Jia, Yongjun; Jia, Yuanyuan; Jiang, Liguang; Johannessen, Johnny A.; Kamachi, Masafumi; Karimova, Svetlana; Kelly, Kathryn; Kim, Sung Yong; King, Robert; Kittel, Cecile M.m.; Klein, Patrice; Klos, Anna; Knudsen, Per; Koenig, Rolf; Kostianoy, Andrey; Kouraev, Alexei; Kumar, Raj; Labroue, Sylvie; Lago, Loreley Selene; Lambin, Juliette; Lasson, Léa; Laurain, Olivier; Laxenaire, Rémi; Lázaro, Clara; Le Gac, Sophie; Le Sommer, Julien; Le Traon, Pierre-yves; Lebedev, Sergey; Léger, Fabien; Legresy, Benoı̂t; Lemoine, Frank; Lenain, Luc; Leuliette, Eric; Levy, Marina; Lillibridge, John; Liu, Jianqiang; Llovel, William; Lyard, Florent; Macintosh, Claire; Makhoul Varona, Eduard; Manfredi, Cécile; Marin, Frédéric; Mason, Evan; Massari, Christian; Mavrocordatos, Constantin; Maximenko, Nikolai; Mcmillan, Malcolm; Medina, Thierry; Melet, Angelique; Meloni, Marco; Mertikas, Stelios; Metref, Sammy; Meyssignac, Benoit; Michaël, Ablain; Minster, Jean-françois; Moreau, Thomas; Moreira, Daniel; Morel, Yves; Morrow, Rosemary; Moyard, John; Mulet, Sandrine; Naeije, Marc; Nerem, Robert Steven; Ngodock, Hans; Nielsen, Karina; Nilsen, Jan Even Øie; Niño, Fernando; Nogueira Loddo, Carolina; Noûs, Camille; Obligis, Estelle; Otosaka, Inès; Otten, Michiel; Oztunali Ozbahceci, Berguzar; P. Raj, Roshin; Paiva, Rodrigo; Paniagua, Guillermina; Paolo, Fernando; Paris, Adrien; Pascual, Ananda; Passaro, Marcello; Paul, Stephan; Pavelsky, Tamlin; Pearson, Christopher; Penduff, Thierry; Peng, Fukai; Perosanz, Felix; Picot, Nicolas; Piras, Fanny; Poggiali, Valerio; Poirier, Étienne; Ponce De León, Sonia; Prants, Sergey; Prigent, Catherine; Provost, Christine; Pujol, M-isabelle; Qiu, Bo; Quilfen, Yves; Rami, Ali; Raney, R. Keith; Raynal, Matthias; Remy, Elisabeth; Rémy, Frédérique; Restano, Marco; Richardson, Annie; Richardson, Donald; Ricker, Robert; Ricko, Martina; Rinne, Eero; Rose, Stine Kildegaard; Rosmorduc, Vinca; Rudenko, Sergei; Ruiz, Simón; Ryan, Barbara J.; Salaün, Corinne; Sanchez-roman, Antonio; Sandberg Sørensen, Louise; Sandwell, David; Saraceno, Martin; Scagliola, Michele; Schaeffer, Philippe; Scharffenberg, Martin G.; Scharroo, Remko; Schiller, Andreas; Schneider, Raphael; Schwatke, Christian; Scozzari, Andrea; Ser-giacomi, Enrico; Seyler, Frederique; Shah, Rashmi; Sharma, Rashmi; Shaw, Andrew; Shepherd, Andrew; Shriver, Jay; Shum, C.k.; Simons, Wim; Simonsen, Sebatian B.; Slater, Thomas; Smith, Walter; Soares, Saulo; Sokolovskiy, Mikhail; Soudarin, Laurent; Spatar, Ciprian; Speich, Sabrina; Srinivasan, Margaret; Srokosz, Meric; Stanev, Emil; Staneva, Joanna; Steunou, Nathalie; Stroeve, Julienne; Su, Bob; Sulistioadi, Yohanes Budi; Swain, Debadatta; Sylvestre-baron, Annick; Taburet, Nicolas; Tailleux, Rémi; Takayama, Katsumi; Tapley, Byron; Tarpanelli, Angelica; Tavernier, Gilles; Testut, Laurent; Thakur, Praveen K.; Thibaut, Pierre; Thompson, Luanne; Tintoré, Joaquín; Tison, Céline; Tourain, Cédric; Tournadre, Jean; Townsend, Bill; Tran, Ngan; Trilles, Sébastien; Tsamados, Michel; Tseng, Kuo-hsin; Ubelmann, Clément; Uebbing, Bernd; Vergara, Oscar; Verron, Jacques; Vieira, Telmo; Vignudelli, Stefano; Vinogradova Shiffer, Nadya; Visser, Pieter; Vivier, Frederic; Volkov, Denis; Von Schuckmann, Karina; Vuglinskii, Valerii; Vuilleumier, Pierrik; Walter, Blake; Wang, Jida; Wang, Chao; Watson, Christopher; Wilkin, John; Willis, Josh; Wilson, Hilary; Woodworth, Philip; Yang, Kehan; Yao, Fangfang; Zaharia, Raymond; Zakharova, Elena; Zaron, Edward D.; Zhang, Yongsheng; Zhao, Zhongxiang; Zinchenko, Vadim; Zlotnicki, Victor.
In 2018 we celebrated 25 years of development of radar altimetry, and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences. Many symbolic major events have celebrated these developments, e.g., in Venice, Italy, the 15th (2006) and 20th (2012) years of progress and more recently, in 2018, in Ponta Delgada, Portugal, 25 Years of Progress in Radar Altimetry. On this latter occasion it was decided to collect contributions of scientists, engineers and managers involved in the worldwide altimetry community to depict the state of altimetry and propose recommendations for the altimetry of the future. This paper summarizes contributions and recommendations that were collected and...
Tipo: Text Palavras-chave: Satellite altimetry; Oceanography; Sea level; Coastal oceanography; Cryospheric sciences; Hydrology.
Ano: 2021 URL: https://archimer.ifremer.fr/doc/00688/79999/82978.pdf
Imagem não selecionada

Imprime registro no formato completo
Assessment of wind-forcing impact on a global wind-wave model using the TOPEX altimeter ArchiMer
Feng, H; Vandemark, D; Quilfen, Yves; Chapron, Bertrand; Beckley, B.
The study presents assessment of an operational wave model (Wavewatch III), focusing upon the model sensitivity to wind-forcing products. Four wind fields are used to drive the model, including the NCEP/NCAR reanalysis and three other products that assimilate various satellite wind measurements having high spatial resolution, including the QuikSCAT scatterometer. Three wave field statistics: significant wave height, mean zero-crossing wave period, and mean square slope are compared with collocated TOPEX altimeter derivatives to gauge the relative skill of differing wind-forced model runs, as well as to demonstrate an extended use of the altimeter beyond simply supplying wave height for wave model validation and assimilation. Results suggest that model...
Tipo: Text Palavras-chave: Sea state bias; Wind forcing; Scatterometer; Altimeter; Wave modeling.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1861.pdf
Imagem não selecionada

Imprime registro no formato completo
Copernicus Marine Service Ocean State Report, Issue 4 ArchiMer
Von Schuckmann, Karina; Le Traon, Pierre-yves; Smith, Neville; Pascual, Ananda; Djavidnia, Samuel; Gattuso, Jean-pierre; Grégoire, Marilaure; Nolan, Glenn; Aaboe, Signe; Fanjul, Enrique Álvarez; Aouf, Lotfi; Aznar, Roland; Badewien, T. H.; Behrens, Arno; Berta, Maristella; Bertino, Laurent; Blackford, Jeremy; Bolzon, Giorgio; Borile, Federica; Bretagnon, Marine; Brewin, Robert J.w.; Canu, Donata; Cessi, Paola; Ciavatta, Stefano; Chapron, Bertrand; Trang Chau, Thi Tuyet; Chevallier, Frédéric; Chtirkova, Boriana; Ciliberti, Stefania; Clark, James R.; Clementi, Emanuela; Combot, Clement; Comerma, Eric; Conchon, Anna; Coppini, Giovanni; Corgnati, Lorenzo; Cossarini, Gianpiero; Cravatte, Sophie; De Alfonso, Marta; De Boyer Montégut, Clement; De Lera Fernández, Christian; De Los Santos, Francisco Javier; Denvil-sommer, Anna; De Pascual Collar, Álvaro; Dias Nunes, Paulo Alonso Lourenco; Di Biagio, Valeria; Drudi, Massimiliano; Embury, Owen; Falco, Pierpaolo; D’andon, Odile Fanton; Ferrer, Luis; Ford, David; Freund, H.; León, Manuel Garcia; Sotillo, Marcos García; García-valdecasas, José María; Garnesson, Philippe; Garric, Gilles; Gasparin, Florent; Gehlen, Marion; Genua-olmedo, Ana; Geyer, Gerhard; Ghermandi, Andrea; Good, Simon A.; Gourrion, Jerome; Greiner, Eric; Griffa, Annalisa; González, Marcelo; Griffa, Annalisa; Hernández-carrasco, Ismael; Isoard, Stéphane; Kennedy, John J.; Kay, Susan; Korosov, Anton; Laanemäe, Kaari; Land, Peter E.; Lavergne, Thomas; Lazzari, Paolo; Legeais, Jean Francois; Lemieux, Benedicte; Levier, Bruno; Llovel, William; Lyubartsev, Vladyslav; Lien, Vidar S.; Lima, Leonardo; Lorente, Pablo; Mader, Julien; Magaldi, Marcello G.; Maljutenko, Ilja; Mangin, Antoine; Mantovani, Carlo; Marinova, Veselka; Masina, Simona; Mauri, Elena; Meyerjürgens, J.; Mignot, Alexandre; Mcewan, Robert; Mejia, Carlos; Melet, Angélique; Menna, Milena; Meyssignac, Benoît; Mouche, Alexis; Mourre, Baptiste; Müller, Malte; Notarstefano, Giulio; Orfila, Alejandro; Pardo, Silvia; Peneva, Elisaveta; Pérez-gómez, Begoña; Perruche, Coralie; Peterlin, Monika; Poulain, Pierre-marie; Pinardi, Nadia; Quilfen, Yves; Raudsepp, Urmas; Renshaw, Richard; Révelard, Adèle; Reyes-reyes, Emma; Ricker, M.; Rodríguez-rubio, Pablo; Rotllán, Paz; Gelabert, Eva Royo; Rubio, Anna; Ruiz-parrado, Inmaculada; Sathyendranath, Shubha; She, Jun; Solidoro, Cosimo; Stanev, Emil V.; Staneva, Joanna; Storto, Andrea; Su, Jian; Bakhsh, Tayebeh Tajalli; Tilstone, Gavin H.; Tintoré, Joaquín; Toledano, Cristina; Tournadre, Jean; Tranchant, Benoit; Uiboupin, Rivo; Valcarcel, Arnaud; Valcheva, Nadezhda; Verbrugge, Nathalie; Vrac, Mathieu; Wolff, J.-o.; Zambianchi, Enrico; Zielinski, O.; Zinck, Ann-sofie; Zunino, Serena.
Tipo: Text
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00653/76554/77672.pdf
Imagem não selecionada

Imprime registro no formato completo
Detection of ocean white-capping by combined use of Jason radiometer and radar datasets alongside global wave model predictions ArchiMer
Vandermark, D; Feng, H; Quilfen, Yves; Ardhuin, Fabrice; Chapron, Bertrand.
Tipo: Text
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00654/76601/77751.pdf
Imagem não selecionada

Imprime registro no formato completo
Extensive high-resolution Synthetic Aperture Radar (SAR) data analysis of Tropical Cyclones: comparisons with SFMR flights and Best-Track ArchiMer
Combot, Clement; Mouche, Alexis; Knaff, John; Zhao, Yuan; Zhao, Yuan; Vinour, Leo; Quilfen, Yves; Chapron, Bertrand.
To produce more precise descriptions of air-sea exchanges under Tropical Cyclones (TCs), spaceborne Synthetic Aperture Radar (SAR) instruments provide unique capabilities to probe the ocean surface conditions, at very high spatial resolution, and on synoptic scales. Using highly-resolved (3 km) wind fields, an extensive database is constructed from Radarsat-2 and Sentinel-1 SAR acquisitions. Spanning 161 tropical cyclones, the database covers all TC intensity categories that have occurred in five different TC basins, and include 29 cases coincident with SFMR measurements. After locating the TC center, a specific methodology is applied to filter out areas contaminated by heavy precipitations to help extract, for each acquisition, the maximum wind speed...
Tipo: Text
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00654/76589/77738.pdf
Imagem não selecionada

Imprime registro no formato completo
Global average of air-sea CO2 transfer velocity from QuikSCAT scatterometer wind speeds ArchiMer
Boutin, J.; Quilfen, Yves; Merlivat, L.; Piolle, Jean-francois.
The absolute calibration of the relationship between air-sea CO2 transfer velocity, k, and wind speed, U, has been a topic of debate for some time, because k global average, < k >, as deduced from Geochemical Ocean Sections Study oceanic C-14 inventory has differed from that deduced from experimental k-U relationships. Recently, new oceanic C-14 inventories and inversions have lead to a lower < k >. In addition, new measurements performed at sea in high-wind speed conditions have led to new k-U relationship. Meanwhile, quality and sampling of satellite wind speeds has greatly improved. The QuikSCAT scatterometer has provided high-quality wind speeds for more than 7 years. This allows us to estimate the global distributions of k computed using...
Tipo: Text Palavras-chave: CO2 transfer velocity; QuikSCAT; CARIOCA.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6394.pdf
Imagem não selecionada

Imprime registro no formato completo
Haline hurricane wake in the Amazon/Orinoco plume: AQUARIUS/SACD and SMOS observations ArchiMer
Grodsky, Semyon A.; Reul, Nicolas; Lagerloef, Gary; Reverdin, Gilles; Carton, James A.; Chapron, Bertrand; Quilfen, Yves; Kudryavtsev, Vladimir N.; Kao, Hsun-ying.
At its seasonal peak the Amazon/Orinoco plume covers a region of 10^6 km2 in the western tropical Atlantic with more than 1m of extra freshwater, creating a near-surface barrier layer (BL) that inhibits mixing and warms the sea surface temperature (SST) to >29oC. Here new sea surface salinity (SSS) observations from the Aquarius/SACD and SMOS satellites help elucidate the ocean response to hurricane Katia, which crossed the plume in early fall, 2011. Its passage left a 1.5psu high haline wake covering >10^5 km2 (in its impact on density, the equivalent of a 3.5oC cooling) due to mixing of the shallow BL. Destruction of this BL apparently decreased SST cooling in the plume, and thus preserved higher SST and evaporation than outside. Combined with SST,...
Tipo: Text
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00094/20540/18943.pdf
Imagem não selecionada

Imprime registro no formato completo
Impact of rain cell on scatterometer data: 1. Theory and modeling - art. no. 3225 ArchiMer
Tournadre, Jean; Quilfen, Yves.
[1] The two scatterometers currently in operation, the Ku-band NASA Seawinds on the QuikScat satellite and the C-band AMI-Wind on the ERS-2 satellite, are designed to infer the ocean wind vectors from sea surface radar backscatter measurements. They provide excellent coverage of the ocean, and their wind products are of great value for ocean and meteorological communities. However, the presence of rain within scatterometer cells can significantly modify the sea surface backscatter coefficient and hence alter the wind vector retrieval. These perturbations can hamper the analysis of wind fields within atmospheric low-pressure systems or tropical cyclones. Rain perturbations result from volume scattering and attenuation by raindrops in the atmosphere as well...
Tipo: Text Palavras-chave: Model of interaction; Ocean surface winds; Rain; Scatterometer.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-513.pdf
Imagem não selecionada

Imprime registro no formato completo
Impact of rain cell on scatterometer data: 2. Correction of Seawinds measured backscatter and wind and rain flagging ArchiMer
Tournadre, Jean; Quilfen, Yves.
In October and early November 1999, the GOGP99 experiment collected hydrological, currentmeter, tide recorder, thermistor and drifting buoy data near the Strait of Hormuz. Data analysis provides the water mass structure in the Strait: Persian Gulf Water (PGW) core is banked against the Omani coast, while Indian Ocean Surface Water (IOSW) lies near the Iranian coast. These water masses are most often covered by a homogeneous surface layer. Thermohaline characteristics of the PGW core decrease substantially downstream, from the Persian/Arabian Gulf to the Gulf of Oman. PGW and IOSW thermohaline characteristics and distribution also exhibit notable changes at periods shorter than a month as shown by repeated hydrological sections. The tidal signal measured...
Tipo: Text Palavras-chave: Wind retrieval; Rain; Scatterometer.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-388.pdf
Imagem não selecionada

Imprime registro no formato completo
Importance of the sea surface curvature to interpret the normalized radar cross section - art. no. C10002 ArchiMer
Mouche, Alexis; Chapron, Bertrand; Reul, Nicolas; Hauser, D; Quilfen, Yves.
[1] Asymptotic models ( small perturbation and small slope approximation at first-order, Kirchhoff approximation or two-scale model) used to predict the normalized radar cross section of the sea surface generally fail to reproduce in detail backscatter radar measurements. In particular, the predicted polarization ratio versus incidence and azimuth angles is not in agreement with experimental data. This denotes the inability of these standard models to fully take into account the roughness properties with respect to the sensor's configuration of measurement ( frequency, incidence, and polarization). On the basis of particular assumptions, to decompose the scattered electromagnetic field between zones covered with freely propagating waves and others where...
Tipo: Text
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3577.pdf
Imagem não selecionada

Imprime registro no formato completo
Multisensor observations of the Amazon-Orinoco river plume interactions with hurricanes ArchiMer
Reul, Nicolas; Quilfen, Yves; Chapron, Bertrand; Fournier, Severine; Kudryavtsev, Vladimir; Sabia, Roberto.
An analysis is presented for the spatial and intensity distributions of North Atlantic extreme atmospheric events crossing the buoyant Amazon-Orinoco freshwater plume. The sea surface cooling amplitude in the wake of an ensemble of storm tracks traveling in that region is estimated from satellite products for the period 1998-2012. For the most intense storms, cooling is systematically reduced by approximate to 50% over the plume area compared to surroundings open-ocean waters. Historical salinity and temperature observations from in situ profiles indicate that salt-driven vertical stratification, enhanced oceanic heat content, and barrier-layer presence within the plume waters are likely key oceanic factors to explain these results. Satellite SMOS surface...
Tipo: Text Palavras-chave: Hurricanes; Amazon-Orinocco river plume; SMOS SSS; Cooling inhibition; Barrier-layer; Haline stratification.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00252/36326/34855.pdf
Imagem não selecionada

Imprime registro no formato completo
Observation of tropical cyclones by high-resolution scatterometry ArchiMer
Quilfen, Yves; Chapron, Bertrand; Elfouhaily, Tanos; Katsaros, Kristina; Tournadre, Jean.
Unprecedented views of surface wind fields in tropical cyclones thereafter TCs) are provided by the European Remote Sensing Satellite (ERS) C band scatterometer. Scatterometer measurements at C band are able to penetrate convective storms clouds, observing the surface wind fields with good accuracy. However the resolution of the measurements (50x50 km(2)) limits the interpretation of the scatterometer signals in such mesoscale events. The strong gradients of the surface wind existing at scales of a few kms are smoothed in the measured features such as the intensity and location of the wind maxima, and the position of the center. Beyond the ERS systems, the scatterometers on-board the ADEOS and METOP satellites, designed by the Jet Propulsion Laboratory and...
Tipo: Text
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00251/36257/34805.pdf
Imagem não selecionada

Imprime registro no formato completo
Observing and Studying Extreme Low Pressure Events with Altimetry ArchiMer
Carrere, Loren; Mertz, Francoise; Dorandeu, Joel; Quilfen, Yves; Patoux, Jerome.
The ability of altimetry to detect extreme low pressure events and the relationship between sea level pressure and sea level anomalies during extra-tropical depressions have been investigated. Specific altimeter treatments have been developed for tropical cyclones and applied to obtain a relevant along-track sea surface height (SSH) signal: the case of tropical cyclone Isabel is presented here. The S- and C-band measurements are used because they are less impacted by rain than the Ku-band, and new sea state bias (SSB) and wet troposphere corrections are proposed. More accurate strong altimeter wind speeds are computed thanks to the Young algorithm. Ocean signals not related to atmospheric pressure can be removed with accuracy, even within a Near Real Time...
Tipo: Text Palavras-chave: Barotropic model; Sea level pressure; Extra tropical depressions; Tropical cyclones; Detection; Altimetry.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6350.pdf
Imagem não selecionada

Imprime registro no formato completo
Ocean surface wave-current signatures from satellite altimeter measurements ArchiMer
Quilfen, Yves; Chapron, Bertrand.
Ocean currents can strongly impact the propagation of swell systems. Satellite altimetry routinely provides measurements of ocean surface significant wave heights (Hs). A self‐consistent space‐scale decomposition is applied to Hs measurements obtained from different altimeters. This method helps reveal overlooked statistical properties at scales less than 100 km, where meso‐ and sub‐mesoscale upper ocean circulation drives a significant part of the variability in the coupled ocean‐atmosphere system. In particular, systematic signatures related to wave‐current interactions are clear at global and regional scales. In the Agulhas current system, the proposed space‐scale decomposition further reveals organized and persistent patterns. To leading order, the...
Tipo: Text Palavras-chave: Altimeter observations; Wave-current interactions; Denoising method.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00472/58359/60917.pdf
Imagem não selecionada

Imprime registro no formato completo
On denoising satellite altimeter measurements for high-resolution geophysical signal analysis ArchiMer
Quilfen, Yves; Chapron, Bertrand.
Satellite radar altimeter observations are key to advanced studies in ocean dynamics, particularly those focusing on mesoscale processes. To resolve scales below about 100 km, because altimeter measurements are often characterized by a low signal-to-noise ratio (SNR), low-pass filtering or least-squares curve fitting is generally applied to smooth the data before analysis. Here, we present an alternative method. It is based on Empirical Mode Decomposition (EMD) developed to analyze non-stationary and non-linear processes, which adaptively projects a signal on a basis of empirical AM/FM functions called Intrinsic Modulation Functions (IMFs). Applied to a Gaussian noise signal, the EMD provides a set of IMFs with a predictable distribution of noise energy...
Tipo: Text Palavras-chave: Altimeter Measurement Noise; Empirical Mode Decomposition; Mesoscale Variability.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00604/71627/70073.pdf
Imagem não selecionada

Imprime registro no formato completo
Optimum satellite remote sensing of the marine carbonate system using empirical algorithms in the global ocean, the Greater Caribbean, the Amazon Plume and the Bay of Bengal ArchiMer
Land, Peter E.; Findlay, Helen S.; Shutler, Jamie D.; Ashton, Ian; Holding, Thomas; Grouazel, Antoine; Ardhuin, Fanny; Reul, Nicolas; Piolle, Jean-francois; Chapron, Bertrand; Quilfen, Yves; Bellerby, Richard G.j.; Bhadury, Punyasloke; Salisbury, Joseph; Vandemark, Douglas; Sabia, Roberto.
Improving our ability to monitor ocean carbonate chemistry has become a priority as the ocean continues to absorb carbon dioxide from the atmosphere. This long-term uptake is reducing the ocean pH; a process commonly known as ocean acidification. The use of satellite Earth Observation has not yet been thoroughly explored as an option for routinely observing surface ocean carbonate chemistry, although its potential has been highlighted. We demonstrate the suitability of using empirical algorithms to calculate total alkalinity (AT) and total dissolved inorganic carbon (CT), assessing the relative performance of satellite, interpolated in situ, and climatology datasets in reproducing the wider spatial patterns of these two variables. Both AT and CT in situ...
Tipo: Text Palavras-chave: Carbonate chemistry; Earth observation; Ocean acidification; Total alkalinity; Dissolved inorganic carbon; SMOS; Aquarius; CORA; HadGEM2-ES.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00591/70267/68368.pdf
Registros recuperados: 33
Primeira ... 12 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional