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	Provedor de dados ArchiMer (55) OceanDocs (10) Gayana (2) Boletín de Investigaciones (1) Bragantia (1) Autor Autret, Emmanuelle (4) Chen, Min-te (4) Vialard, Jerome (4) Fromentin, Jean-marc (3) Kirtman, B.P. (3) Royer, Francois (3) Barrows, Timothy T. (2) Blouch, P. (2) Bouruet-aubertot, P. (2) Boutin, J. (2) De Deckker, Patrick (2) Demarcq, Herve (2) Donlon, Craig (2) Gaillard, Fabienne (2) He, Juan (2) Klein, Patrice (2) Lapeyre, Guillaume (2) Li, Li (2) Martin, N. (2) Misra, V. (2) Mais... Palavra-chave Sea surface temperature (69) Alkenone (4) Fronts (4) South China Sea (4) Bay of Biscay (3) Okinawa Trough (3) Spawning (3) Thunnus thynnus (3) Atmospheric conditions (2) Chlorophyll-a (2) Circulation (2) Deglaciation (2) East Asian monsoon (2) East China Sea (2) El nino (2) Gulf of Lions (2) IMAGES (2) Interannual variability (2) Ocean colour (2) Pacific ocean (2) Mais... Tipo do documento Text (55) Journal Contribution (3) Working Paper (3) Info:eu-repo/semantics/article (2) Journal article (2) Conference Material (1) Preprint (1) Report (1) Theses and Dissertations (1) Mais... Ano 2020 (4) 2019 (3) 2018 (5) 2017 (1) 2016 (2) 2015 (3) 2014 (1) 2013 (7) 2012 (2) 2011 (1) 2010 (2) 2009 (2) 2008 (10) 2007 (5) 2006 (3) 2005 (3) 2004 (4) 2003 (1) 2002 (4) 2001 (1) Mais... País France (55) Belgium (10) Chile (2) Brazil (1) Colombia (1) Idioma Inglês (68) Francês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 69 Primeira ... 1 2 3 4 ... Última Remotly Sensed Sea Surface Temperature from Aircraft Gayana Kwon,B. H.; Benech,B.; Durand,P.; Kim,Y. S.. The experiment was conducted around south of the Azores islands, in the middle eastern part of the northern-Atlantic basin. The experimental area was situated between 31°N-38°N and 21°W-28°W. The experiment was performed in order to improve our knowledge of ocean-atmosphere interactions from the local-scale to the meso-scale. The sea surface temperature remotely measured by aircraft was corrected considering the radiation flux divergence. From the descending IR flux in function of the difference between the surface temperatures measured from the ship and the aircraft (SSTshipSSTaircraft), the difference decreases when the IR flux increases. The sea surface temperature was corrected of the radiation flux divergence of the atmosphere between the sea surface... Tipo: Journal article Palavras-chave: Sea surface temperature; Aircraft; Radiation flux divergence; Infrared radiation. Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300007 AN INTERACTIVE SOFTWARE PACKAGE FOR VALIDATING SATELLITE DATA Gayana Muraleedharan,P.M.; Pankajakshan,T.. Earth observation satellite launched in the last three decades have made vital contributions to the understanding of the planet. The earth system consisting of land, oceans and atmosphere is linked together by a number of complicated processes. Potential of microwave sensors in studying the boundary layer dynamics of the ocean-atmosphere system is well documented. Technology has revolutionized the application of such sensors and several missions are planned to take off in near future for meeting specific objectives. Launching of such sensors need to be followed by an extensive validation campaign for providing accurate and reliable information to the users. A PC-based interactive system has been developed and presented here for validating satellite mounted... Tipo: Journal article Palavras-chave: Validation; Microwave sensor; Autocorrelation; Sea surface temperature; Wind speed; Columnar water vapor. Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300018 Spatial and Seasonal Distributions of Frontal Activity over the French Continental Shelf in the Bay of Biscay ArchiMer Yelekci, Ozge; Charria, Guillaume; Capet, Xavier; Reverdin, Gilles; Sudre, Joel; Yahia, Hussein. The frontal activity in coastal regions remains a research field where a large number of open questions needs to be addressed to quantify the potential impact of these processes on dependent systems (e.g. biogeochemical activity). Spatial and seasonal distributions of Sea Surface Temperature (SST) fronts (∼1-100 km) in the vicinity of main French rivers, Gironde and Loire, are explored over the continental shelf North of 45 °N in the Bay of Biscay. A high resolution (1 km spatial and daily temporal resolutions) dataset of 11 years' (2003 to 2013) remotely sensed SST by MODIS sensor onboard Aqua and Terra satellites has been investigated and compared with coastal numerical model experiments. The detection and characterization fronts with fluctuating... Tipo: Text Palavras-chave: Bay of Biscay; Fronts; Submesoscale; Satellite; Sea surface temperature; Singularity exponent. Ano: 2017 URL: http://archimer.ifremer.fr/doc/00389/50013/50602.pdf Mangrove increases resiliency of the French Guiana shrimp fishery facing global warming ArchiMer Diop, Bassirou; Blanchard, Fabian; Sanz, Nicolas. This paper deals with the biological, ecological and economic impact of global warming and mangrove habitat availability on the French Guiana shrimp fishery. A dynamic bio-economic model is built by employing a shrimp stock's growth function depending on Sea Surface Temperature (SST) and on mangrove surface. The model is empirically calibrated for the French Guiana shrimp fishery using time series collected over 1995–2011. First, two Cobb-Douglas functions, which describe shrimp's natural growth and harvest, are estimated. Then, a Maximum Economic Yield (MEY) harvest rule, based on the optimization of the net present value derived from fishing, is computed. Three management strategies are compared (Closure, Status Quo management, and MEY) under three... Tipo: Text Palavras-chave: Renewable resources; Fishery bio-economic model; Global warming; Shrimp; Sea surface temperature; Mangrove. Ano: 2018 URL: https://archimer.ifremer.fr/doc/00455/56672/58537.pdf Exploring Machine Learning to Correct Satellite-Derived Sea Surface Temperatures ArchiMer Picart, Stephane Saux; Tandeo, Pierre; Autret, Emmanuelle; Gausset, Blandine. Machine learning techniques are attractive tools to establish statistical models with a high degree of non linearity. They require a large amount of data to be trained and are therefore particularly suited to analysing remote sensing data. This work is an attempt at using advanced statistical methods of machine learning to predict the bias between Sea Surface Temperature (SST) derived from infrared remote sensing and ground “truth” from drifting buoy measurements. A large dataset of collocation between satellite SST and in situ SST is explored. Four regression models are used: Simple multi-linear regression, Least Square Shrinkage and Selection Operator (LASSO), Generalised Additive Model (GAM) and random forest. In the case of geostationary satellites for... Tipo: Text Palavras-chave: Machine learning; Systematic error; Sea surface temperature; Random forest. Ano: 2018 URL: https://archimer.ifremer.fr/doc/00426/53797/54721.pdf Ocean currents and gradients of surface layer properties in the vicinity of the Madagascar Ridge (including seamounts) in the South West Indian Ocean ArchiMer Vianello, Patrick; Ternon, Jean-francois; Demarcq, Herve; Herbette, Steven; Roberts, Michael J.. This work is part of the MADRidge Project special issue which aims to describe pelagic ecosystems in the vicinity of three prominent shallow seamounts in the South West Indian Ocean: one here named MAD-Ridge (240 m below the surface) plus Walters Shoal (18 m) on the Madagascar Ridge, and La Pérouse (60 m) on the abyssal plain east of Madagascar. The three span latitudes 20°S and 33°S, some 1500 km. The study provides the background oceanography for the once-off, multidisciplinary snapshot cruise studies around the seamounts. As life on seamounts is determined by factors such as summit depth, proximity to the light layers of the ocean, and the ambient circulation, a first description of regional spatial-field climatologies (16–22 years) and monthly... Tipo: Text Palavras-chave: South West Indian Ocean; Madagascar Ridge; Seamounts; Walters shoal; Sea surface temperature; Eddy kinetic energy; Mixed layer depth; Chlorophyll-a; Geostrophic currents. Ano: 2020 URL: https://archimer.ifremer.fr/doc/00634/74581/74476.pdf Determining bluefin tuna habitat through frontal features in the Mediterranean sea ArchiMer Royer, Francois; Fromentin, Jean-marc; Farrugio, Henri; Gaspar, Philippe. The distribution patterns of bluefin tuna schools observed during the STROMBOLI EU project (2000-2002) were analysed in relation to oceanographic conditions. High-resolution radiometers (AVHRR and SeaWiFS) were used on a daily basis to derive maps of environmental variability. An edge detection technique was especially applied to estimate the position of frontal features. Using a variety of geostatistical and point process techniques, we were able to show that the distribution of bluefin schools was partially driven by the occurrence of transient fronts in the Gulf of Lions. This is believed to be mainly a trophic association, since enhanced convergence and retention processes occur at fronts, possibly leading to higher prey densities (e.g. anchovies). The... Tipo: Text Palavras-chave: Thunnus thynnus; Aerial survey; Gulf of Lions; Sea surface temperature; Ocean colour; Fronts. Ano: 2005 URL: http://archimer.ifremer.fr/doc/00194/30504/28914.pdf Linking wind and interannual upwelling variability in a regional model of the southern Benguela - art. no. 2188 ArchiMer Blanke, Bruno; Roy, Claude; Penven, Pierrick; Speich, Sabrina; Mcwilliams, James; Nelson, Greville. We quantify the wind contribution to the development of interannual sea surface temperature (SST) anomalies along the shelf of southern Africa. We compare numerical simulations that differ only in the amount of variability kept in the ERS1/2-derived surface wind forcing. Surprisingly, most of the cold and warm episodes over the Agulhas Bank are strictly related to local fluctuations of the forcing, whereas the shelf of the west coast extending 400 km north of Cape Columbine is equally sensitive to open-sea wind fluctuations. We diagnose the respective role of mesoscale eddy activity and of low frequency and intra-monthly wind fluctuations in generating interannual SST variability. The fair degree of correlation obtained at a few locations between the model... Tipo: Text Palavras-chave: Numerical simulation; Wind fluctuation; Sea surface temperature; Upwelling. Ano: 2002 URL: https://archimer.ifremer.fr/doc/2002/publication-770.pdf Late Quaternary planktic foraminifer fauna and monsoon upwelling records from the western South China Sea, near the Vietnam margin (IMAGES MD012394) ArchiMer Yu, Pai-sen; Mii, Horng-sheng; Murayama, Masafumi; Chen, Min-te. Marine sediment core MD012394 from the Vietnam coastal upwelling area in the western South China Sea was investigated in order to reconstruct the last Quaternary monsoon upwelling based on planktic foraminifer fauna assemblages and faUna-based sea surface temperature (SST) estimates. The age model of core MD012394 was constructed using oxygen isotope stratigraphy of the planktic foraminifer G. sacculifer, with 10 accelerator mass spectrometry (AMS) 14 C dating of planktic foraminifers from the sediment samples. Our studies on the relative and absolute abundances of planktic foraminifer assemblages reveal eight dominant species in core MD012394: N. dutertrei + N. pachyderma (right coiling), G. ruber, G. glutinata, G. sacculifer, P obliquiloculata, G.... Tipo: Text Palavras-chave: South China Sea; Planktonic foraminifer fauna; Sea surface temperature; East Asian monsoon; Summer insolation. Ano: 2008 URL: https://archimer.ifremer.fr/doc/00237/34816/33681.pdf Slow warming of the northern South China Sea during the last deglaciation ArchiMer Shintani, Tomoya; Yamamoto, Masanobu; Chen, Min-te. We have generated a record of alkenone sea surface temperatures (SSTs) during the last 28000 years from Core MD97-2146 for the northern South China Sea (SCS). The SST record showed a typical pattern for change in the northern SCS SST. The SST during the LGM was similar to 25 degrees C, this decreased to similar to 24 degrees C to 17 ka, increased to similar to 25.5 degrees C to 14.5 ka, decreased again to similar to 24.5 degrees C to 11.8 ka, increased gradually to similar to 27 degrees C to 6 ka, and then increased more gradually to reach similar to 27.5 degrees C at present. The SST difference (Delta SSTNSCS = SSTMD97-2146 - SSTMD97-2141) between Cores MD97-2146 (the northern SCS; this study) and MD97-2141 (the Sulu Sea; Rosenthal et al. 2003) was used... Tipo: Text Palavras-chave: Alkenone; Sea surface temperature; South China Sea; MD97-2146; The last deglaciation; The last glacial maximum. Ano: 2008 URL: https://archimer.ifremer.fr/doc/00237/34815/33679.pdf Comparison of organic (U-37(K)', TEX86H, LDI) and faunal proxies (foraminiferal assemblages) for reconstruction of late Quaternary sea surface temperature variability from offshore southeastern Australia ArchiMer Lopes Dos Santos, Raquel A.; Spooner, Michelle I.; Barrows, Timothy T.; De Deckker, Patrick; Damste, Jaap S. Sinninghe; Schouten, Stefan. Several proxies have been developed to reconstruct past sea surface temperature (SST), but different proxies may reflect temperatures of different seasons and each proxy is characterized by certain uncertainties. Therefore, a multiproxy approach is preferred to precisely reconstruct SST. Here, we reconstruct SST of the ocean offshore southeastern Australia (Murray Canyons area) for the last ~135 ka using three independent organic proxies (TEXH86 based on glycerol dialkyl glycerol tetraethers (GDGTs), UK'37 based on alkenones, and LDI based on long-chain diols) in addition to foraminiferal faunal assemblages. The organic proxy records show similar trends, with the highest temperature (21°C for UK'37 and TEXH86, and 25°C for LDI) during the last interglacial... Tipo: Text Palavras-chave: Sea surface temperature; LDI index; TEX86H index; U-37(K') index; Foraminiferal assemblages; SE Australia. Ano: 2013 URL: https://archimer.ifremer.fr/doc/00246/35763/34274.pdf Mg/Ca ratios of two Globigerinoides ruber (white) morphotypes: Implications for reconstructing past tropical/ subtropical surface water conditions ArchiMer Steinke, S; Chiu, Hy; Yu, Ps; Shen, Cc; Lowemark, L; Mii, Hs; Chen, Mt. Tests of the planktonic foraminifer Globigerinoides ruber ( white; d'Orbigny) have become a standard tool for reconstructing past oceanic environments. Paleoceanographers often utilize the Mg/Ca ratios of the foraminiferal tests for reconstructing low-latitude ocean glacial-interglacial changes in sea surface temperatures (SST). We report herein a comparison of Mg/Ca measurements on sample pairs (n = 20) of two G. ruber (white) morphotypes (G. ruber sensu stricto (s. s.) and G. ruber sensu lato ( s. l.)) from surface and downcore samples of the western Pacific and Indian Oceans. G. ruber s. s. refers to specimens with spherical chambers sitting symmetrically over previous sutures with a wide, high arched aperture, whereas G. ruber s. l. refers to a more... Tipo: Text Palavras-chave: Planktonic foraminifera; Globigerinoides ruber (white); Morphotypes; Mg/Ca; Stable isotopes; Sea surface temperature. Ano: 2005 URL: https://archimer.ifremer.fr/doc/00230/34081/32520.pdf Simulated seasonal and interannual variability of the mixed layer heat budget in the northern Indian Ocean ArchiMer De Boyer Montegut, Clement; Vialard, Jerome; Shenoi, S. S. C.; Shankar, D.; Durand, Fabien; Ethe, Christian; Madec, Gurvan. A global ocean general circulation model (OGCM) is used to investigate the mixed layer heat budget of the northern Indian Ocean (NIO). The model is validated against observations and shows fairly good agreement with mixed layer depth data in the NIO. The NIO has been separated into three subbasins: the western Arabian Sea (AS), the eastern AS, and the Bay of Bengal (BoB). This study reveals strong differences between the western and eastern AS heat budget, while the latter basin has similarities with the BoB. Interesting new results on seasonal time scales are shown. The penetration of solar heat flux needs to be taken into account for two reasons. First, an average of 28 W m(-2) is lost beneath the mixed layer over the year. Second, the penetration of... Tipo: Text Palavras-chave: Sea surface temperature; General circulation model; Southeastern arabian sea; Thermal structure; Summer monsoon; Solar radiation; Pacific ocean; Barrier layer; Bengal; Bay. Ano: 2007 URL: http://archimer.ifremer.fr/doc/00185/29639/27985.pdf Atmospheric response to sea surface temperature mesoscale structures ArchiMer Lambaerts, J.; Lapeyre, Guillaume; Plougonven, R.; Klein, Patrice. Recent studies have revealed that strong sea surface temperature (SST) fronts, on the scale of a Western Boundary Current, significantly affect not just the Marine Boundary Layer but the entire troposphere. This has aroused renewed interest in air-sea interactions. The present study investigates the atmospheric response to fixed SST anomalies associated with mesoscale oceanic eddies and submesoscale filaments, using idealized simulations. Our main result is that in weak wind conditions, the vertical velocity in the planetary boundary layer (PBL) is linearly proportional to the SST Laplacian. This is established by a quantitative analysis in the spatial space as well as in the spectral space. Comparing the responses to two different SST fields shows that... Tipo: Text Palavras-chave: Air-sea interactions; Boundary layer; Sea surface temperature. Ano: 2013 URL: http://archimer.ifremer.fr/doc/00169/28047/26247.pdf Environmental noise in spawning areas: the case of Atlantic bluefin tuna (Thunnus thynnus) ArchiMer Royer, Francois; Fromentin, Jean-marc. This paper provides an exploratory analysis aiming to seek whether the colour of environmental noise theory could help in understanding the intriguing reproductive strategy of Atlantic bluefin tuna (BFT). A frequency-based approach based on spectral exponents, f(beta) with beta < 0, is chosen and applied on 10 biogeographical provinces covering the North Atlantic. The major BFT spawning area, i.e. the Mediterranean Sea, was the only one to display a pink power spectrum, whereas open ocean regions displayed more reddened fluctuations, i.e. greater variance at low frequencies. Environmental noise in the Mediterranean could, thus, offer more favourable characteristics on the long-term than the open ocean. The implications of these findings are discussed in... Tipo: Text Palavras-chave: Thunnus thynnus; Spectral analysis; Spawning; Sea surface temperature; Environmental noise. Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2437.pdf Near-Sea Surface Temperature Stratification from SVP Drifters ArchiMer Reverdin, Gilles; Morisset, S.; Bellenger, H.; Boutin, J.; Martin, N.; Blouch, P.; Rolland, Jean; Gaillard, Fabienne; Bouruet-aubertot, P.; Ward, B.. This study describes how the hull temperature (Ttop) measurements from multisensor surface velocity program (SVP) drifters can be combined with other measurements to provide quantitative information on near-surface vertical temperature stratification during large daily cycles. First, Ttop is compared to the temperature measured at 17 -cm depth from a float tethered to the SVP drifter. These 2007-12 SVP drifters present a larger daily cycle by 1%-3% for 1 degrees-2 degrees C daily cycle amplitudes, with a maximum difference close to the local noon. The difference could result from flow around the SVP drifter in the presence of temperature stratification in the top 20 cm of the water column but also from a small influence of internal drifter temperature on... Tipo: Text Palavras-chave: Sea surface temperature; Buoy observations. Ano: 2013 URL: http://archimer.ifremer.fr/doc/00155/26589/24720.pdf Association between bluefin tuna schools and oceanic features in the western Mediterranean ArchiMer Royer, Francois; Fromentin, Jean-marc; Gaspar, P. We present an analysis of the distribution of bluefin tuna Thunnus thynnus schools spotted during aerial surveys in the Gulf of Lions, in relation to oceanographic features. Bio-optical and thermal properties of the sea surface derived from high-resolution sensors (AVHRR and SeaWiFS) were studied on a daily basis, and an edge-detection technique was applied to detect frontal zones. Geostatistics and point-process analyses were used to evaluate the role of the environment in structuring the spatial pattern of bluefin tuna (BFT). The distribution of schools spotted was strongly non-stationary both in space and time; this is believed to be an effect of the survey design (transect sampling) and the influence of transient oceanographic structures (surface... Tipo: Text Palavras-chave: Thunnus thynnus; Gulf of Lions; Point process analysis; Front detection; Sea surface temperature; Ocean colour; Aggregation. Ano: 2004 URL: http://archimer.ifremer.fr/doc/00000/10786/7585.pdf Quantifying Tidal Fluctuations in Remote Sensing Infrared SST Observations ArchiMer González-haro, Cristina; Ponte, Aurelien; Autret, Emmanuelle. The expected amplitude of fixed-point sea surface temperature (SST) fluctuations induced by barotropic and baroclinic tidal flows is estimated from tidal current atlases and SST observations. The fluctuations considered are the result of the advection of pre-existing SST fronts by tidal currents. They are thus confined to front locations and exhibit fine-scale spatial structures. The amplitude of these tidally induced SST fluctuations is proportional to the scalar product of SST frontal gradients and tidal currents. Regional and global estimations of these expected amplitudes are presented. We predict barotropic tidal motions produce SST fluctuations that may reach amplitudes of 0.3 K. Baroclinic (internal) tides produce SST fluctuations that may reach... Tipo: Text Palavras-chave: Sea surface temperature; Satellite observations; Tidal currents; Internal tides. Ano: 2019 URL: https://archimer.ifremer.fr/doc/00589/70075/68048.pdf Variations in temperature and salinity of the surface water above the middle Okinawa Trough during the past 37 kyr ArchiMer Yu, Hua; Liu, Zhenxia; Berne, Serge; Jia, Guodong; Xiong, Yingqian; Dickens, Gerald R.; Wei, Gangjian; Shi, Xuefa; Liu, J. Paul; Chen, Fajin. East China Sea (ECS) is an important climate modulator of East Asia. In the last glacial period, the global sea level, the path and strength of the Kuroshio Current experienced great changes; combined with the variable volume of fresh run-off input, they made the hydrographic situation in the ECS quite different from nowadays. Based on high-resolution alkenone-sea surface temperature (SST) and oxygen isotope composition of planktonic foraminifera Globigerinoides sacculifer we reconstructed paleo-sea surface salinity (SSS) of a long piston core DGKS9604 retrieved from the middle Okinawa Trough of the eastern ECS. The delta O-18 and SST records display significant variations with global ice volume. Synchrony of the millennial-scale climate events like YD and... Tipo: Text Palavras-chave: Sea surface salinity; Sea surface temperature; East Asian monsoon; Kuroshio Current; Okinawa Trough; East China Sea. Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-7398.pdf Single foraminifera Mg/Ca analyses of past glacial-interglacial temperatures derived from G. ruber sensu stricto and sensu lato morphotypes ArchiMer Schmitt, A.; Elliot, M.; Thirumalai, K.; La, C.; Bassinot, F.; Petersen, J.; Movellan, A.; Jorry, Stephan; Borgomano, J.. The ratio of magnesium to calcium (Mg/Ca) in foraminiferal shells is commonly used as a proxy for past ocean temperature. Recent advances in elemental analyses now enable single-specimen measurements of planktic foraminifera and thus, can provide information on past seasonal and interannual variability, owing to the near-monthly lifespan of foraminifera. In this study, we explore the temperature variance recorded by Mg/Ca in tests of foraminifera Globigerinoides ruber, a planktic species that occurs throughout the year in tropical waters. Using LA-ICP-MS, we characterize Mg/Ca variability in single specimens of two morphotypes of G. ruber picked from a sediment core retrieved offshore New Caledonia. We provide an estimate of the range of calcification... Tipo: Text Palavras-chave: Globigerinoides ruber; Mg/Ca ratio; Sea surface temperature; LA-ICPMS; Seasonality; Quaternary. Ano: 2019 URL: https://archimer.ifremer.fr/doc/00472/58336/60890.pdf Registros recuperados: 69 Primeira ... 1 2 3 4 ... Última

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