Consulta: creatorFacets:"Boutin, Jacqueline"
Registros recuperados: 25
Data/hora: 06/06/2024 15:14:50

Surface salinity drifters for SMOS validation
Provedor de dados: 5
Autores: Morisset, S.; Reverdin, Gilles; Boutin, Jacqueline; Martin, N.; Yin, X.; Gaillard, Fabienne; Blouch, Pierre; Rolland, J.; Font, J; Salvador, J.
Tipo: Text
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00114/22552/20240.pdf

Assessment of seasonal and year-to-year surface salinity signals retrieved from SMOS and Aquarius missions in the Bay of Bengal
Provedor de dados: 5
Autores: Akhil, V. P.; Lengaigne, Matthieu; Durand, Fabien; Vialard, Jerome; Chaitanya, A. V. S.; Keerthi, M. G.; Gopalakrishna, V. V.; Boutin, Jacqueline; De Boyer Montegut, Clement.
The Bay of Bengal (BoB) exhibits a wide range of sea surface salinity (SSS), with very fresh water induced by heavy monsoonal precipitation and river run-offs to the north, and saltier water to the south. This is a particularly challenging region for the application of satellite-derived SSS measurements because of the potential pollution of the SSS signal by radio frequency interference (RFI) and land-induced contamination in this semi-enclosed basin. The present study validates recent level-3 monthly gridded (1° × 1°) SSS products from Soil Moisture and Ocean Salinity (SMOS) and Aquarius missions to an exhaustive in situ SSS product for the BoB. Current SMOS SSS retrievals do not perform better than existing climatologies. This is in stark contrast to...
Tipo: Text
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00319/42986/45003.pdf

Remote Sensing of Sea Surface Salinity From CAROLS L-Band Radiometer in the Gulf of Biscay
Provedor de dados: 5
Autores: Martin, Adrien; Boutin, Jacqueline; Hauser, Daniele; Reverdin, Gilles; Parde, Mickael; Zribi, Mehrez; Fanise, Pascal; Chanut, Jerome; Lazure, Pascal; Tenerelli, Joseph; Reul, Nicolas.
A renewal of interest for the radiometric L-band Sea Surface Salinity (SSS) remote sensing appeared in the 1990s and led to the Soil Moisture and Ocean Salinity (SMOS) satellite launched in November 2009 and to the Aquarius mission (launched in June 2011). However, due to low signal to noise ratio, retrieving SSS from L-band radiometry is very challenging. In order to validate and improve L-band radiative transfer model and salinity retrieval method used in SMOS data processing, the Cooperative Airborne Radiometer for Ocean and Land Studies (CAROLS) was developed. We analyze here a coastal flight (20 May 2009), in the Gulf of Biscay, characterized by strong SSS gradients (28 to 35 pss-78). Extensive in-situ measurements were gathered along the plane track....
Tipo: Text
Palavras-chave: L-band; Microwave radiometry; Remote sensing; Retrieval method; Sea surface salinity (SSS); Soil Moisture and Ocean Salinity (SMOS); Wind speed.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00079/18997/16600.pdf

Validation of Salinity Data from Surface Drifters
Provedor de dados: 5
Autores: Reverdin, Gilles; Morisset, S.; Boutin, Jacqueline; Martin, Nicolas; Sena-martins, M.; Gaillard, Fabienne; Blouch, P.; Rolland, J.; Font, J.; Salvador, J.; Fernandez, Pili; Stammer, D.
Salinity measurements from 119 surface drifters in 2007-12 were assessed; 80% [Surface Velocity Program with a barometer with a salinity sensor (SVP-BS)] and 75% [SVP with salinity (SVP-S)] of the salinity data were found to be usable, after editing out some spikes. Sudden salinity jumps are found in drifter salinity records that are not always associated with temperature jumps, in particular in the wet tropics. A method is proposed to decide whether and how to correct those jumps, and the uncertainty in the correction applied. Northeast of South America, in a region influenced by the Amazon plume and fresh coastal water, drifter salinity is very variable, but a comparison with data from the Soil Moisture and Ocean Salinity satellite suggests that this...
Tipo: Text
Palavras-chave: Surface observations; Surface layer; Data quality control; Buoy observations.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00190/30095/28748.pdf

Correcting Sea Surface Temperature Spurious Effects in Salinity Retrieved From Spaceborne L-Band Radiometer Measurements
Provedor de dados: 5
Autores: Boutin, Jacqueline; Vergely, Jean-luc; Dinnat, Emmanuel P.; Waldteufel, Philippe; D'Amico, Francesco; Reul, Nicolas; Supply, Alexandre; Thouvenin-masson, Clovis.
Earlier studies have pointed out systematic differences between sea surface salinity retrieved from L-band radiometric measurements and measured in situ, which depend on sea surface temperature (SST). We investigate how to cope with these differences given existing physically based radiative transfer models. In order to study differences coming from seawater dielectric constant parametrization, we consider the model of Somaraju and Trumpf (2006) (ST) which is built on sound physical bases and close to a single relaxation term Debye equation. While ST model uses fewer empirically adjusted parameters than other dielectric constant models currently used in salinity retrievals, ST dielectric constants are found close to those obtained using the Meissner and...
Tipo: Text
Palavras-chave: Dielectric constant; L-band microwave radiometry; Sea surface salinity (SSS).
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00657/76943/78203.pdf

SMOS salinity in the subtropical north Atlantic salinity maximum: 1. Comparison with Aquarius and in situ salinity
Provedor de dados: 5
Autores: Hernandez, Olga; Boutin, Jacqueline; Kolodziejczyk, Nicolas; Reverdin, Gilles; Martin, Nicolas; Gaillard, Fabienne; Reul, Nicolas; Vergely, J. L.
Sea surface salinity (SSS) measured from space by the Soil Moisture and Ocean Salinity (SMOS) mission is validated in the subtropical North Atlantic Ocean. 39 transects of ships of opportunity equipped with thermosalinographs (TSG) crossed that region from 2010 to 2012, providing a large database of ground truth SSS. SMOS SSS is also compared to Aquarius SSS. Large seasonal biases remain in SMOS and Aquarius SSS. In order to look at the capability of satellite SSS to monitor spatial variability, especially at scales less than 300 km (not monitored with the Argo network), we first apply a monthly bias correction derived from satellite SSS and In Situ Analysis System (ISAS) SSS differences averaged over the studied region. Ship SSS averaged over 25 km is...
Tipo: Text
Palavras-chave: SMOS; Salinity; Remote sensing; Subtropical North Atlantic.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00210/32150/34082.pdf

Sea surface salinity under rain cells: SMOS satellite and in situ drifters observations
Provedor de dados: 5
Autores: Boutin, Jacqueline; Martin, Nicolas; Reverdin, Gilles; Morisset, S.; Yin, X.; Centurioni, L.; Reul, Nicolas.
We study the signature of rainfall on S1cm, the sea surface salinity retrieved from the Soil Moisture and Ocean Salinity (SMOS) satellite mission first by comparing SMOS S1cm with ARGO sea surface salinity measured at about 5 m depth in the Intertropical Convergence Zone (ITCZ) and in the Southern Pacific Convergence Zone; second by investigating spatial variability of SMOS S1cm related to rainfall. The resulting estimated S1cm decrease associated with rainfall occurring within less than 1 h from the salinity measurement is close to −0.2 pss (mm h−1) −1. We estimate that rain induced roughness and atmospheric effects are responsible for no more than 20% of this value. We also study the signature of rainfall on sea surface salinity measured by surface...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00206/31735/30139.pdf

Consistency of satellite climate data records for Earth system monitoring
Provedor de dados: 5
Autores: Popp, Thomas; Hegglin, Michaela I.; Hollmann, Rainer; Ardhuin, Fabrice; Bartsch, Annett; Bastos, Ana; Bennett, Victoria; Boutin, Jacqueline; Brockmann, Carsten; Buchwitz, Michael; Chuvieco, Emilio; Ciais, Philippe; Dorigo, Wouter; Ghent, Darren; Jones, Richard; Lavergne, Thomas; Merchant, Christopher J.; Meyssignac, Benoit; Paul, Frederic; Quegan, Shaun; Sathyendranath, Shubha; Scanlon, Tracy; Schröder, Marc; Simis, Stefan G. H.; Willén, Ulrika.
Climate Data Records (CDRs) of Essential Climate Variables (ECVs) as defined by the Global Climate Observing System (GCOS) derived from satellite instruments help to characterize the main components of the Earth system, to identify the state and evolution of its processes, and to constrain the budgets of key cycles of water, carbon and energy. The Climate Change Initiative (CCI) of the European Space Agency (ESA) coordinates the derivation of CDRs for 21 GCOS ECVs. The combined use of multiple ECVs for Earth system science applications requires consistency between and across their respective CDRs. As a comprehensive definition for multi-ECV consistency is missing so far, this study proposes defining consistency on three levels: (1) consistency in format...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00635/74700/74639.pdf

Surface Salinity in the North Atlantic Subtropical Gyre During the STRASSE/SPURS Summer 2012 Cruise
Provedor de dados: 5
Autores: Reverdin, Gilles; Morisset, Simon; Marie, Louis; Bourras, Denis; Sutherland, Graigory; Ward, Brian; Salvador, Joaquin; Font, Jordi; Cuypers, Yannis; Centurioni, Luca; Hormann, Verena; Koldziejczyk, Nicolas; Boutin, Jacqueline; D'Ovidio, Francesco; Nencioli, Francesco; Martin, Nicolas; Diverres, Denis; Alory, Gael; Lumpkin, Rick.
We investigated a 100 x 100 km high-salinity region of the North Atlantic subtropical gyre during the Sub-Tropical Atlantic Surface Salinity Experiment/Salinity Processes in the Upper-ocean Regional Study (STRASSE/SPURS) cruise from August 21, 2012, to September 9, 2012. Results showed great variability in sea surface salinity (SSS; over 0.3 psu) in the mesoscale, over 7 cm of total evaporation, and little diapycnal mixing below 36 m depth, the deepest mixed layers encountered. Strong currents in the southwestern part of the domain, and the penetration of freshwater, suggest that advection contributed greatly to salinity evolution. However, it was further observed that a smaller cyclonic structure tucked between the high SSS band and the strongest currents...
Tipo: Text
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00270/38148/36277.pdf

CAROLS: A New Airborne L-Band Radiometer for Ocean Surface and Land Observations
Provedor de dados: 5
Autores: Zribi, Mehrez; Parde, Mickael; Boutin, Jacqueline; Fanise, Pascal; Hauser, Daniele; Dechambre, Monique; Kerr, Yann; Leduc-leballeur, Marion; Reverdin, Gilles; Skou, Niels; Sobjaerg, Sten; Albergel, Clement; Calvet, Jean Christophe; Wigneron, Jean Pierre; Lopez-baeza, Ernesto; Rius, Antonio; Tenerelli, Joseph.
The "Cooperative Airborne Radiometer for Ocean and Land Studies" (CAROLS) L-Band radiometer was designed and built as a copy of the EMIRAD II radiometer constructed by the Technical University of Denmark team. It is a fully polarimetric and direct sampling correlation radiometer. It is installed on board a dedicated French ATR42 research aircraft, in conjunction with other airborne instruments (C-Band scatterometer-STORM, the GOLD-RTR GPS system, the infrared CIMEL radiometer and a visible wavelength camera). Following initial laboratory qualifications, three airborne campaigns involving 21 flights were carried out over South West France, the Valencia site and the Bay of Biscay (Atlantic Ocean) in 2007, 2008 and 2009, in coordination with in situ field...
Tipo: Text
Palavras-chave: Radiometer; CAROLS; L band; SMOS; Ocean salinity; Soil moisture.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00240/35118/33615.pdf

Air-sea CO2 flux variability in frontal regions of the Southern Ocean from CARbon Interface OCean Atmosphere drifters
Provedor de dados: 5
Autores: Boutin, Jacqueline; Merlivat, L.; Henocq, C.; Martin, Nicolas; Sallee, Jean-baptiste.
Nine CARbon Interface OCean Atmosphere (CARIOCA) drifters were deployed in the Southern Ocean (south of the subtropical front, STF) between 2001 and 2006. They recorded 65 months of measurements in all seasons between 57 degrees S and 40 degrees S. Hydrological fronts detected by altimetry indicate that one buoy explored the polar zone (PZ) of the Atlantic Ocean and the western Indian Ocean; the remaining buoys explored the northern and southern parts of the subantarctic zone (SAZ) from the mid-Indian Ocean (73 degrees E) to the eastern Pacific Ocean (112 degrees W). The air-sea CO2 fluxes along the buoy trajectories are primarily driven by the spatial variability of the fugacity of CO2 in seawater, fCO(2): in the SAZ, they vary between -1.1 and -4.2 mol...
Tipo: Text
Palavras-chave: Antarctic circumpolar current; Northwestern mediterranean sea; Atlantic sector; Surface water; Gas exchange; Polar front; Temperature; Seawater; Transport.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00204/31483/29880.pdf

Properties of surface water masses in the Laptev and the East Siberian seas in summer 2018 from in situ and satellite data
Provedor de dados: 5
Autores: Tarasenko, Anastasiia; Supply, Alexandre; Kusse-tiuz, Nikita; Ivanov, Vladimir; Makhotin, Mikhail; Tournadre, Jean; Chapron, Bertrand; Boutin, Jacqueline; Kolodziejczyk, Nicolas; Reverdin, Gilles.
Variability of surface water masses of the Laptev and the East Siberian seas in August–September 2018 is studied using in situ and satellite data. In situ data were collected during the ARKTIKA-2018 expedition and then complemented with satellite-derived sea surface temperature (SST), salinity (SSS), sea surface height, wind speed, and sea ice concentration. The estimation of SSS fields is challenging in high-latitude regions, and the precision of soil moisture and ocean salinity (SMOS) SSS retrieval is improved by applying a threshold on SSS weekly error. For the first time in this region, the validity of DMI (Danish Meteorological Institute) SST and SMOS SSS products is thoroughly studied using ARKTIKA-2018 expedition continuous thermosalinograph...
Tipo: Text
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00678/79015/81413.pdf

Active-passive synergy for interpreting ocean L-band emissivity: Results from the CAROLS airborne campaigns
Provedor de dados: 5
Autores: Martin, A. C. H.; Boutin, Jacqueline; Hauser, D.; Dinnat, E. P.
The impact of the ocean surface roughness on the ocean L-band emissivity is investigated using simultaneous airborne measurements from an L-band radiometer (CAROLS) and from a C-band scatterometer (STORM) acquired in the Gulf of Biscay (off-the French Atlantic coasts) in November 2010. Two synergetic approaches are used to investigate the impact of surface roughness on the L-band brightness temperature (Tb). First, wind derived from the scatterometer measurements is used to analyze the roughness contribution to Tb as a function of wind and compare it with the one simulated by SMOS and Aquarius roughness models. Then residuals from this mean relationship are analyzed in terms of mean square slope derived from the STORM instrument. We show improvement of new...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00203/31410/29802.pdf

Satellite Salinity Observing System: Recent Discoveries and the Way Forward
Provedor de dados: 5
Autores: Vinogradova, Nadya; Lee, Tong; Boutin, Jacqueline; Drushka, Kyla; Fournier, Severine; Sabia, Roberto; Stammer, Detlef; Bayler, Eric; Reul, Nicolas; Gordon, Arnold; Melnichenko, Oleg; Li, Laifang; Hackert, Eric; Martin, Matthew; Kolodziejczyk, Nicolas; Hasson, Audrey; Brown, Shannon; Misra, Sidharth; Lindstrom, Eric.
Advances in L-band microwave satellite radiometry in the past decade, pioneered by ESA’s SMOS and NASA’s Aquarius and SMAP missions, have demonstrated an unprecedented capability to observe global sea surface salinity (SSS) from space. Measurements from these missions are the only means to probe the very-near surface salinity (top cm), providing a unique monitoring capability for the interfacial exchanges of water between the atmosphere and the upper-ocean, and delivering a wealth of information on various salinity processes in the ocean, linkages with the climate and water cycle, including land-sea connections, and providing constraints for ocean prediction models. The satellite SSS data are complimentary to the existing in situ systems such as Argo that...
Tipo: Text
Palavras-chave: Salinity; Remote sensing; Earth's observing systems; Future satellite missions; SMAP; SMOS; Aquarius.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00498/60985/64391.pdf

A multi-decade record of high-quality fCO(2) data in version 3 of the Surface Ocean CO2 Atlas (SOCAT)
Provedor de dados: 5
Autores: Bakker, Dorothee C. E.; Pfeil, Benjamin; Landa, Camilla S.; Metzl, Nicolas; O'Brien, Kevin M.; Olsen, Are; Smith, Karl; Cosca, Cathy; Harasawa, Sumiko; Jones, Stephen D.; Nakaoka, Shin-ichiro; Nojiri, Yukihiro; Schuster, Ute; Steinhoff, Tobias; Sweeney, Colm; Takahashi, Taro; Tilbrook, Bronte; Wada, Chisato; Wanninkhof, Rik; Alin, Simone R.; Balestrini, Carlos F.; Barbero, Leticia; Bates, Nicholas R.; Bianchi, Alejandro A.; Bonou, Frederic; Boutin, Jacqueline; Bozec, Yann; Burger, Eugene F.; Cai, Wei-jun; Castle, Robert D.; Chen, Liqi; Chierici, Melissa; Currie, Kim; Evans, Wiley; Featherstone, Charles; Feely, Richard A.; Fransson, Agneta; Goyet, Catherine; Greenwood, Naomi; Gregor, Luke; Hankin, Steven; Hardman-mountford, Nick J.; Harlay, Jerome; Hauck, Judith; Hoppema, Mario; Humphreys, Matthew P.; Hunt, Christopherw.; Huss, Betty; Ibanhez, J. Severino P.; Johannessen, Truls; Keeling, Ralph; Kitidis, Vassilis; Koertzinger, Arne; Kozyr, Alex; Krasakopoulou, Evangelia; Kuwata, Akira; Landschuetzer, Peter; Lauvset, Siv K.; Lefevre, Nathalie; Lo Monaco, Claire; Manke, Ansley; Mathis, Jeremy T.; Merlivat, Liliane; Millero, Frank J.; Monteiro, Pedro M. S.; Munro, David R.; Murata, Akihiko; Newberger, Timothy; Omar, Abdirahman M.; Ono, Tsuneo; Paterson, Kristina; Pearce, David; Pierrot, Denis; Robbins, Lisa L.; Saito, Shu; Salisbury, Joe; Schlitzer, Reiner; Schneider, Bernd; Schweitzer, Roland; Sieger, Rainer; Skjelvan, Ingunn; Sullivan, Kevin F.; Sutherland, Stewart C.; Sutton, Adrienne J.; Tadokoro, Kazuaki; Telszewski, Maciej; Tuma, Matthias; Van Heuven, Steven M. A. C. .; Vandemark, Doug; Ward, Brian; Watson, Andrew J.; Xu, Suqing.
The Surface Ocean CO2 Atlas (SOCAT) is a synthesis of quality-controlled fCO(2) (fugacity of carbon dioxide) values for the global surface oceans and coastal seas with regular updates. Version 3 of SOCAT has 14.7 million fCO(2) values from 3646 data sets covering the years 1957 to 2014. This latest version has an additional 4.6 million fCO(2) values relative to version 2 and extends the record from 2011 to 2014. Version 3 also significantly increases the data availability for 2005 to 2013. SOCAT has an average of approximately 1.2 million surface water fCO(2) values per year for the years 2006 to 2012. Quality and documentation of the data has improved. A new feature is the data set quality control (QC) flag of E for data from alternative sensors and...
Tipo: Text
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00383/49405/49890.pdf

SMOS: The Challenging Sea Surface Salinity Measurement From Space
Provedor de dados: 5
Autores: Font, Jordi; Camps, Adriano; Borges, Andres; Martin-neira, Manuel; Boutin, Jacqueline; Reul, Nicolas; Kerr, Yann H.; Hahne, Achim; Mecklenburg, Susanne.
Soil Moisture and Ocean Salinity, European Space Agency, is the first satellite mission addressing the challenge of measuring sea surface salinity from space. It uses an L-band microwave interferometric radiometer with aperture synthesis (MIRAS) that generates brightness temperature images, from which both geophysical variables are computed. The retrieval of salinity requires very demanding performances of the instrument in terms of calibration and stability. This paper highlights the importance of ocean salinity for the Earth's water cycle and climate; provides a detailed description of the MIRAS instrument, its principles of operation, calibration, and image-reconstruction techniques; and presents the algorithmic approach implemented for the retrieval of...
Tipo: Text
Palavras-chave: Aperture synthesis; Imaging; Microwave radiometry; Remote sensing; Salinity.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00004/11482/8066.pdf

Sea Surface Salinity and Temperature Budgets in the North Atlantic Subtropical Gyre during SPURS Experiment: August 2012-August 2013
Provedor de dados: 5
Autores: Sommer, Anna; Reverdin, Gilles; Kolodziejczyk, Nicolas; Boutin, Jacqueline.
Variability at large to meso-scale in sea surface salinity (SSS) and sea surface temperature (SST) is investigated in the subtropical North Atlantic Ocean during the Subtropical Atlantic Surface Salinity Experiment Strasse/SPURS in August 2012—August 2013. The products of the Soil Moisture and Ocean Salinity (SMOS) mission corrected from large scale systematic errors are tested and used to retrieve meso-scale salinity features, while OSTIA products, resolving meso-scale temperature features are used for SST. The comparison of corrected SMOS SSS data with drifter's in situ measurements from SPURS experiment shows a reasonable agreement, especially during winter time with RMS differences on the order of 0.15 pss (for 10 days, 75 km resolution SMOS product)....
Tipo: Text
Palavras-chave: Salinity; Temperature; Budget; Meso-scale; Advection; SMOS; SPURS.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00468/57933/60319.pdf

Perspectives and Integration in SOLAS Science
Provedor de dados: 5
Autores: Garcon, Veronique; Bell, Thomas G; Wallace, Douglas; Arnold, Steve R.; Baker, Alex R.; Bakker, Dorothee C. E.; Bange, Hermann W.; Bates, Nicholas R.; Bopp, Laurent; Boutin, Jacqueline; Boyd, Phili^w.; Bracher, Astrid; Burrows, John P.; Carpenter, Lucy J; De Leeuw, Gerrit; Fennel, Katja; Font, Jordi; Friedrich, Tobias; Garbe, Christoph S.; Gruber, Nicolas; Jaegle, Lyatt; Lana, Arancha; Lee, James D.; Liss, Peter S.; Miller, Lisa A.; Olgun, Nazli; Olsen, Are; Pfeil, Benjamin; Quack, Birgit; Read, Katie A.; Reul, Nicolas; Rodenbeck, Christian; Rohekar, Oliver; Saiz-lopez, Alfonso; Saltzman, Eric S.; Schneising, Oliver; Schuster, Ute; Seferian, Roland; Seinhoff, Tobias; Le Traon, Pierre-yves; Ziska, Franziska.
Why a chapter on Perspectives and Integration in SOLAS Science in this book? SOLAS science by its nature deals with interactions that occur: across a wide spectrum of time and space scales, involve gases and particles, between the ocean and the atmosphere, across many disciplines including chemistry, biology, optics, physics, mathematics, computing, socio-economics and consequently interactions between many different scientists and across scientific generations. This chapter provides a guide through the remarkable diversity of cross-cutting approaches and tools in the gigantic puzzle of the SOLAS realm.  Here we overview the existing prime components of atmospheric and oceanic observing systems, with the acquisition of ocean–atmosphere observables either...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00171/28189/26428.pdf

Relaxation of wind stress drives the abrupt onset of biological carbon uptake in the Kerguelen Bloom: a multisensor approach
Provedor de dados: 5
Autores: Pellichero, Violaine; Boutin, Jacqueline; Claustre, Hervé; Merlivat, Liliane; Sallée, Jean‐baptiste; Blain, Stéphane.
We deployed sensors for physical and biogeochemical measurements on one Eulerian mooring and two Lagrangian biogeochemical Argo‐floats on the Kerguelen Plateau. High temporal and vertical resolution measurements revealed an abrupt shoaling of both the mixed‐layer depth and mixing‐layer depth. The sudden stratification was concomitant with the start of significant biological activity detected by chlorophyll‐a accumulation, oxygen oversaturation and dissolved inorganic carbon drawdown. The net community production computed in the mixing‐layer during the onset period of 9 days was 119±7 mmol m‐2 d‐1. While it is generally admitted that bloom initiation is mostly driven by the onset of positive heat fluxes, our results suggest this is not a sufficient...
Tipo: Text
Palavras-chave: Onset of the phytoplankton bloom; Mixing-layer depth; In situ high-resolution data; Mixed-layer depth; Air-sea heat flux; Wind stress.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00624/73572/72941.pdf

The SMOS Mission: New Tool for Monitoring Key Elements of the Global Water Cycle
Provedor de dados: 5
Autores: Kerr, Yann H.; Waldteufel, Philippe; Wigneron, Jean-pierre; Delwart, Steven; Cabot, Francois; Boutin, Jacqueline; Escorihuela, Maria-jose; Font, Jordi; Reul, Nicolas; Gruhier, Claire; Juglea, Silvia Enache; Drinkwater, Mark R.; Hahne, Achim; Martin-neira, Manuel; Mecklenburg, Susanne.
It is now well understood that data on soil moisture and sea surface salinity (SSS) are required to improve meteorological and climate predictions. These two quantities are not yet available globally or with adequate temporal or spatial sampling. It is recognized that a spaceborne L-band radiometer with a suitable antenna is the most promising way of fulfilling this gap. With these scientific objectives and technical solution at the heart of a proposed mission concept the European Space Agency (ESA) selected the Soil Moisture and Ocean Salinity (SMOS) mission as its second Earth Explorer Opportunity Mission. The development of the SMOS mission was led by ESA in collaboration with the Centre National d'Etudes Spatiales (CNES) in France and the Centro para...
Tipo: Text
Palavras-chave: Interferometry; L-band; Sea surface salinity (SSS); Soil moisture; Soil Moisture and Ocean Salinity (SMOS); Vegetation water content.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00004/11483/8065.pdf

Errors in SMOS Sea Surface Salinity and their dependency on a priori wind speed
Provedor de dados: 5
Autores: Yin, Xiaobin; Boutin, Jacqueline; Martin, Nicolas; Spurgeon, Paul; Vergely, Jean-luc; Gaillard, Fabienne.
The wind speed (WS) provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) is used to initialize the retrieval process of WS and Sea Surface Salinity (SSS) obtained by the Soil Moisture and Ocean Salinity (SMOS) mission. This process compensates for the lack of onboard instrument providing a measure of ocean surface WS independent of the L-band radiometer measurements. The SMOS-retrieved WS in the center of the swath (± 300 km) is adjusted regarding to its a priori estimate. The quality of the SMOS-retrieved SSS (SSSSMOS) is better at the center of the swath than at the edge of the swatch because the larger number of brightness temperature measurements available at the center of the swath reduces the effects of noise and because the...
Tipo: Text
Palavras-chave: SMOS; SSMIS; ECMWF; Wind speed; Salinity.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00158/26970/25261.pdf

Sea surface freshening inferred from SMOS and ARGO salinity: impact of rain
Provedor de dados: 5
Autores: Boutin, Jacqueline; Martin, Nicolas; Reverdin, Gilles; Yin, Xiaoming; Gaillard, Fabienne.
The sea surface salinity (SSS) measured from space by the Soil Moisture and Ocean Salinity (SMOS) mission has recently been revisited by the European Space Agency first campaign reprocessing. We show that, with respect to the previous version, biases close to land and ice greatly decrease. The accuracy of SMOS SSS averaged over 10 days, 100 x 100 km(2) in the open ocean and estimated by comparison to ARGO (Array for Real-Time Geostrophic Oceanography) SSS is on the order of 0.3-0.4 in tropical and subtropical regions and 0.5 in a cold region. The averaged negative SSS bias (-0.1) observed in the tropical Pacific Ocean between 5 degrees N and 15 degrees N, relatively to other regions, is suppressed when SMOS observations concomitant with rain events, as...
Tipo: Text
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00139/25073/23161.pdf

Sea surface salinity structure of the meandering Gulf Stream revealed by SMOS sensor
Provedor de dados: 5
Autores: Reul, Nicolas; Chapron, Bertrand; Lee, T.; Donlon, Craig; Boutin, Jacqueline; Alory, G.
Measurements from the Soil Moisture Ocean Salinity (SMOS) satellite acquired during 2012 in the western North Atlantic are used to reveal the evolution of the sea surface salinity (SSS) structure of the meandering Gulf Stream with an unprecedented space and time resolution. Combined with in situ surface and profile measurements, satellite-derived surface currents, sea surface height (SSH), surface temperature (SST), and chlorophyll (Chl) data, SMOS SSS observations are shown to coherently delineate meanders pinching off from the current to form well-identified salty- (warm-) and fresh- (cold-) core Gulf Stream rings. A covariance analysis at two locations along the separated Gulf stream path (south of Nova Scotia and in the Gulf Stream Extension) reveals a...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00188/29974/28427.pdf

Increase of dissolved inorganic carbon and decrease in pH in near-surface waters in the Mediterranean Sea during the past two decades
Provedor de dados: 5
Autores: Merlivat, Liliane; Boutin, Jacqueline; Antoine, David; Beaumont, Laurence; Golbol, Melek; Vellucci, Vincenzo.
Two 3-year time series of hourly measurements of the fugacity of CO2 (f CO2) in the upper 10 m of the surface layer of the northwestern Mediterranean Sea have been recorded by CARIOCA sensors almost two decades apart, in 1995-1997 and 2013-2015. By combining them with the alkalinity derived from measured temperature and salinity, we calculate changes in pH and dissolved inorganic carbon (DIC). DIC increased in surface seawater by similar to 25 mu mol kg(-1) and fCO(2) by 40 mu atm, whereas seawater pH decreased by similar to 0.04 (0.0022 yr(-1)). The DIC increase is about 15 % larger than expected from the equilibrium with atmospheric CO2. This could result from natural variability, e.g. the increase between the two periods in the frequency and intensity...
Tipo: Text
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00585/69695/67582.pdf

Sea Surface Salinity Observations from Space with the SMOS Satellite: A New Means to Monitor the Marine Branch of the Water Cycle
Provedor de dados: 5
Autores: Reul, Nicolas; Fournier, Severine; Boutin, Jacqueline; Hernandez, Olga; Maes, Christophe; Chapron, Bertrand; Alory, Gael; Quilfen, Yves; Tenerelli, Joseph; Morisset, Simmon; Kerr, Yann; Mecklenburg, Susanne; Delwart, Steven.
While it is well known that the ocean is one of the most important component of the climate system, with a heat capacity 1,100 times greater than the atmosphere, the ocean is also the primary reservoir for freshwater transport to the atmosphere and largest component of the global water cycle. Two new satellite sensors, the ESA Soil Moisture and Ocean Salinity (SMOS) and the NASA Aquarius SAC-D missions, are now providing the first space-borne measurements of the sea surface salinity (SSS). In this paper, we present examples demonstrating how SMOS-derived SSS data are being used to better characterize key land–ocean and atmosphere–ocean interaction processes that occur within the marine hydrological cycle. In particular, SMOS with its ocean mapping...
Tipo: Text
Palavras-chave: Sea surface salinity; SMOS satellite; Passive microwave remote sensing; Oceanic freshwater cycle.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00152/26334/24430.pdf