A5076128921- Oceanographic and Atmospheric Processes
- Climate variability and models
- Tropical and Extratropical Cyclones Research
- Ocean Waves and Remote Sensing
- Marine and fisheries research
- Marine and coastal ecosystems
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Coastal and Marine Management
- Coastal and Marine Dynamics
- Meteorological Phenomena and Simulations
- Geological and Geophysical Studies
- Coastal wetland ecosystem dynamics
- Marine animal studies overview
- Aeolian processes and effects
- Soil Moisture and Remote Sensing
- Geological Studies and Exploration
- Geological formations and processes
- Underwater Acoustics Research
- Methane Hydrates and Related Phenomena
- Geophysics and Gravity Measurements
- Ocean Acidification Effects and Responses
- Food Industry and Aquatic Biology
- Coral and Marine Ecosystems Studies
- Maritime Navigation and Safety
Université de Toulouse
2014-2025
Laboratoire d’Études en Géophysique et Océanographie Spatiales
2016-2025
Institut de Recherche pour le Développement
2014-2025
Centre National de la Recherche Scientifique
2013-2025
Université Toulouse III - Paul Sabatier
2003-2025
Service Hydrographique et Océanographique de la Marine
2024
Laboratory for Ocean Physics and Satellite Remote Sensing
2024
Centre National d'Études Spatiales
2014-2023
Université d'Abomey-Calavi
2014-2016
Conservatoire National des Arts et Métiers
2015
The linear trends in oceanic temperature from 1960 to 1999 are estimated using the new Indian Ocean Thermal Archive (IOTA), a compilation of historical profiles. Widespread surface warming is found, as other data sets, and reproduced IPCC climate model simulations for 20th century. This particularly large subtropics, extends down 800 m around 40–50°S. Models suggest deep‐reaching subtropical related 0.5° southward shift gyre driven by strengthening westerly winds, associated with an upward...
The freshest surface waters in the tropical Pacific are found at its eastern boundary. Using situ observations, we depict quasi‐permanent presence of a far fresh pool with sea salinity (SSS) lower than 33, which is confined between Panama's west coast and 85°W December extends westward to 95°W April. Strong SSS fronts outer edge this pool. We investigate seasonal dynamics using complementary satellite wind, rain, level oceanic current data surface, along hydrographic profiles. appears off...
Abstract We study mesoscale eddy characteristics in the tropical Atlantic Ocean, using 23 years of daily altimetry sea level anomalies. Eddies are mainly generated eastern boundary upwelling systems and Brazil Current region. Their westward propagation speed reaches 20 cm/s equatorial areas, decreasing with latitudes. They present typical amplitudes 1‐5 cm. The largest most energetic eddies observed region, especially North (NBC) retroflection. seasonal cycle shows higher along NBC...
Measurements from the Soil Moisture Ocean Salinity (SMOS) satellite acquired during 2012 in western North Atlantic are used to reveal evolution of sea surface salinity (SSS) structure meandering Gulf Stream with an unprecedented space and time resolution. Combined situ profile measurements, satellite-derived currents, height (SSH), temperature (SST), chlorophyll (Chl) data, SMOS SSS observations shown coherently delineate meanders pinching off current form well-identified salty- (warm-)...
Wind-driven coastal upwelling can be compensated by onshore geostrophic flow, and river plumes are associated with such flow. We investigate possible limitation of the northeast Gulf Guinea Niger River plume, using regional ocean model simulations or without dynamical indices. Here, is weakened 50% due to an flow equally controlled alongshore thermosteric halosteric sea-level changes. The contributes only 20% this as its plume shallow while affects temperature salinity over a larger depth....
Abstract. In this paper, we review observational and modelling results on the upwelling in tropical Atlantic between 10∘ N 20∘ S. We focus physical processes that drive seasonal variability of surface cooling upward nutrient flux required to explain seasonality biological productivity. separately consider equatorial system, coastal system Gulf Guinea Angolan system. All three systems have common a strong cycle, with peak productivity during boreal summer. However, driving vary systems. For...
Abstract In the equatorial Indian Ocean, sea surface has warmed by 0.5°–1°C over 1960–99 period, while waters have cooled at thermocline depth and net atmospheric heat flux decreased. Among a set of twentieth-century climate simulations from 12 coupled models, Centre National de Recherches Météorologiques Coupled Global Climate Model version 3 (CNRM-CM3) reproduces key observed features these changes. It is used to investigate changes in budget upper Ocean identify mechanisms responsible for...
Abstract We investigate the causes of seasonal cycle near‐surface salinity using a mixed‐layer model and combination satellite products, atmospheric reanalyses, in situ observations for period 2000–2008, tropical Atlantic Ocean. find that balance differs from one region to another. In western Atlantic, it is controlled by horizontal advection March November freshwater flux entrainment rest year. central mainly due strong contribution precipitation agreement with previous results....
The role ships play in atmospheric, oceanic, and biogeochemical observations is described with a focus on measurements made within 100 m of the ocean surface. Ships include merchant research vessels, cruise liners ferries, fishing coast guard, military, other government-operated ships, yachts, growing fleet automated surface vessels. present capabilities to measure essential climate/ocean variables requirements from broad community address operational, commercial, scientific needs are...
Abstract Regular and long-term monitoring of coastal areas is a prerequisite to avoiding or mitigating the impacts climate human-driven hazards. In Africa, where populations infrastructures are particularly exposed risk, there an urgent need establish monitoring, as observations generally scarce. Measurement campaigns very high-resolution satellite imagery costly, while freely available have temporal spatial resolutions that not suited capture event scale. To address gap, network low-cost,...
Abstract The Congolese upwelling system (CoUS), located along the West African coast north of Congo River, is one most productive and least studied systems in Gulf Guinea. minimum sea surface temperature CoUS occurs austral winter, when winds are weak not particularly favorable to coastal upwelling. Here, for first time, we use a high‐resolution regional ocean model identify key atmospheric oceanic processes that control seasonal evolution mixed layer 1°‐wide band from 6°S 4°S. good...
Sea Surface Salinity (SSS) is an essential climate variable that requires long term in situ observation. In this objective, the French SSS Observation Service (SSS-OS) manages a network of ships opportunity equipped with thermosalinographs (TSG). The global though more concentrated North Atlantic and tropical Pacific ocean, where it was initiated than 50 years ago. acquisition system autonomous real time transmission regularly serviced at harbor calls. There are distinct time, near delayed...
The monitoring of Sea Surface Salinity (SSS) over the Earth has been profoundly enhanced during last fifteen years due to a new generation satellite sensors. L-band radiometry is currently only technology measure SSS from space. European Soil Moisture and Ocean (SMOS) mission was first carry an L-Band radiometer. It launched in November 2009 it still operation. Moreover, SMOS observations have spatial resolution ~45km, made possible by innovative Synthetic Aperture Radiometry used for time...
Abstract The characteristic sea surface salinity (SSS) patterns associated with the tropical Atlantic meridional and equatorial interannual modes are extracted from in situ observations, by a statistical analysis performed on 1980–2012 period. These SSS signatures of climatic reproduced regional numerical simulation. For each mode, oceanic and/or atmospheric processes driving signature identified through mixed‐layer salt budget validated model. During positive mode spring, northward shift...
To highlight the processes by which Niger River warms coastal waters in eastern part of northern Gulf Guinea upwelling, two simulations NEMO model at high resolution were used over period 2010 - 2017. The first simulation is realistic while second a effects are not taken into account. step was to evaluate outputs models, using satellite products and situ observations. average states Sea Surface Temperature, Salinity, Height, zonal current vertical profiles temperature salinity showed ability...
Abessolo Ondoa, G.; Almar, R.; Kestenare, E.; Bahini, A.; Houngue, G-H.; Jouanno, J.; Du Penhoat, Y.; Castelle, B.; Melet, Meyssignac, Anthony Laibi, Alory, G., and Ranasinghe R., 2016. Potential of video cameras in assessing event seasonal coastline behaviour: a case study at Grand Popo, Benin (Gulf Guinea). In: Vila-Concejo, Bruce, Kennedy, D.M., McCarroll, R.J. (eds.), Proceedings the 14th International Coastal Symposium (Sydney, Australia). Journal Research, Special Issue, No.75, pp....
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The sensitivity of tropical ocean dynamics to the lateral mixing orientation is explored using a z‐coordinate climate‐type general circulation model. Compared simulation horizontal on both tracers and (HOR), rotation tracer tensor in which occurs along isopycnals (ISOT) improves structure off‐equatorial density field, consequently enhances through geostrophy. However, at equator ISOT are degraded compared observations, as upper part Equatorial Undercurrent (EUC) too deep South Current (SEC)...
The main modes of interannual climate variability in the tropical Pacific are identified using satellite‐derived wind (ERS) and sea level (TOPEX/Poseidon) data for 1993–1999 period output from a linear model forced by observed Florida State University (FSU) 1964–1999 period. During dominant El Niño‐Southern Oscillation (ENSO) signal showed up equatorial band as zonal seesaw pattern around fulcrum at dateline, associated with an patch centered near dateline. This oscillation is described...
Strong cooling events off the western barrier reef of New Caledonia have been recently observed and attributed to wind‐driven coastal upwelling. A simple one‐dimensional model based on a heat budget in mixed laxer is developed calibrated explain daily variations sea surface temperature (SST) at station southwestern from 1992 2005. This takes into account wind‐forced vertical advection air‐sea fluxes, as well seasonal subsurface stratification. It can large part SST helps quantify relative...