A5021953448- Oceanographic and Atmospheric Processes
- Climate variability and models
- Marine and coastal ecosystems
- Ocean Waves and Remote Sensing
- Tropical and Extratropical Cyclones Research
- Arctic and Antarctic ice dynamics
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Geophysics and Gravity Measurements
- Marine and fisheries research
- Marine and environmental studies
- Meteorological Phenomena and Simulations
- Geological and Geophysical Studies
- Hydrological Forecasting Using AI
- Reservoir Engineering and Simulation Methods
- Marine animal studies overview
- Geological Studies and Exploration
- Soil Moisture and Remote Sensing
- Underwater Acoustics Research
- Marine Bivalve and Aquaculture Studies
- Global Maritime and Colonial Histories
- Advanced Computational Techniques and Applications
Institut de Recherche pour le Développement
2004-2025
Institut Universitaire Européen de la Mer
2022-2025
Ifremer
2014-2025
Centre National de la Recherche Scientifique
2004-2025
Laboratory for Ocean Physics and Satellite Remote Sensing
2016-2025
Université de Bretagne Occidentale
2017-2024
Laboratoire d’Études en Géophysique et Océanographie Spatiales
2009-2023
Japan Agency for Marine-Earth Science and Technology
2007-2010
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
2005-2007
Institut Pierre-Simon Laplace
2004-2007
A new 2° resolution global climatology of the mixed layer depth (MLD) based on individual profiles is constructed. Previous climatologies have been temperature or density‐gridded climatologies. The criterion selected a threshold value density from near‐surface at 10 m (Δ T = 0.2°C Δσ θ 0.03 kg −3 ). validation moored time series data shows that method successful following base layer. In particular, first spring restratification better captured than with more commonly used larger criteria....
Abstract. The French program Coriolis, as part of the operational oceanographic system, produces COriolis dataset for Re-Analysis (CORA) on a yearly basis. This contains in-situ temperature and salinity profiles from different data types. latest release CORA3 covers period 1990 to 2010. Several tests have been developed ensure homogeneous quality control meet requirements physical ocean reanalysis activities (assimilation validation). Improved include some simple based comparison with...
Using instantaneous temperature and salinity profiles, including recent Argo data, a global ocean climatology of monthly mean properties the “barrier layer” (BL) phenomenon is constructed. This based on individual analysis profiles in contrast with previous large‐scale climatologies derived from gridded fields. ensures more accurate description BL phenomenon. We distinguish three types regions: BLs are quasi‐permanent equatorial western tropical Atlantic Pacific, Bay Bengal, eastern Indian...
Abstract The Indian summer monsoon rainfall has complex, regionally heterogeneous, interannual variations with huge socioeconomic impacts, but the underlying mechanisms remain uncertain. upwelling along Somalia and Oman coasts starts in late spring, peaks during monsoon, strongly cools sea surface temperature (SST) western Arabian Sea. They restrict westward extent of Ocean warm pool, which is main moisture source for rainfall. Thus, Somalia–Oman can have significant impacts on transport...
A new 0.5° resolution Mediterranean climatology of the mixed layer depth based on individual profiles temperature and salinity has been constructed. The criterion selected is a threshold value from near‐surface at 10 m depth, mainly derived by method applied global (de Boyer Montégut et al., 2004 dBM04). With respect to dBM04, main differences reside in absence spatial interpolation final fields improved resolution. These changes are necessary reproduce layer's behavior. In climatological...
A climatology of Sea‐viewing Wide Field‐of‐View Sensor (SeaWiFS) chlorophyll data over the Indian Ocean is used to examine bloom variability patterns, identifying spatio‐temporal contrasts in appearance and intensity relating them physical environment. The near‐surface ocean dynamics assessed using an general circulation model (OGCM). It found that a large part basin, seasonal cycle phytoplankton characterized by two consecutive blooms, one during summer monsoon, other winter monsoon. Each...
A new global climatology of the barrier layer (BL) thickness based on analysis instantaneous temperature and salinity profiles was presented in first part this paper. It is used here to revisit mean properties phenomenon tropics. Consistent with previous studies, thick persistent BLs are detected deep tropics each ocean. Their formation involves various mechanisms such as intense precipitations, oceanic circulation, wind seasonality, river runoff, relation specific geography basin. The weak...
Abstract In response to the Indian Monsoon freshwater forcing, Bay of Bengal exhibits a very strong seasonal cycle in sea surface salinity (SSS), especially near mouths Ganges‐Brahmaputra and along east coast India. this paper, we use an eddy‐permitting (∼25 km resolution) regional ocean general circulation model simulation quantify processes responsible for SSS cycle. Despite absence relaxation toward observations, reproduces main features observed cycle, with freshest water northeastern...
The Vasco-Cirene program explores how strong air-sea interactions promoted by the shallow thermocline and high sea surface temperature in Seychelles-Chagos ridge results marked variability at synoptic, intraseasonal, interannual time scales. Cirene oceanographic cruise collected oceanic, atmospheric, flux observations this region January–February 2007. contemporaneous Vasco field experiment complemented these measurements with balloon deployments from Seychelles. also contributed to...
The Ocean State Report is an annual publication of the Copernicus Marine Service that provides a comprehensive and state-of-the-art report on current state, natural variations, ongoing changes in global ocean European regional seas.It meant to act as reference Union for scientific community, international national bodies, general public.Using satellite data, models reanalyses, situ measurements, 4-dimensional view (latitude, longitude, depth, time) blue (e.g.hydrography currents), white...
Abstract. Three methods for automatic detection of mesoscale coherent structures are applied to Sea Level Anomaly (SLA) fields in the South Atlantic. The first method is based on wavelet packet decomposition SLA data, second estimation Okubo-Weiss parameter and third a geometric criterion using winding-angle approach. results provide comprehensive picture eddies over Atlantic Ocean, emphasizing their main characteristics: amplitude, diameter, duration propagation velocity. Five areas...
Abstract. The ocean mixed layer is the interface between interior and atmosphere or sea ice plays a key role in climate variability. It thus critical that numerical models used studies are capable of good representation layer, especially its depth. Here we evaluate mixed-layer depth (MLD) six pairs non-eddying (1∘ grid spacing) eddy-rich (up to 1/16∘) from Ocean Model Intercomparison Project (OMIP), forced by common atmospheric state. For model evaluation, use an updated MLD dataset computed...
Abstract A global ocean general circulation model (OGCM) is used to investigate the mixed layer heat budget of northern Indian Ocean (NIO). The validated against observations and shows fairly good agreement with depth data in NIO. NIO has been separated into three subbasins: western Arabian Sea (AS), eastern AS, Bay Bengal (BoB). This study reveals strong differences between AS budget, while latter basin similarities BoB. Interesting new results on seasonal time scales are shown. penetration...
A moored buoy was recently deployed at 8°S, 67°E in the shallow thermocline region of Indian Ocean known as “Seychelles‐Chagos Thermocline Ridge” (SCTR), where Madden Julian Oscillation (MJO) is associated with strong sea surface temperature (SST) variability. We use observations from this mooring to describe oceanic signature two MJOs between November 2007 and February 2008. The four‐month average upper ocean heat balance largely heating by atmospheric forcing (2.0 ± 0.3°C/month) a...
scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et recherche français étrangers, laboratoires publics privés.
Phytoplankton chlorophyll‐a (Chl) seasonal cycles of the North Atlantic are described using satellite ocean color observations covering 1980s and 2000s. The study region is where warmer SST higher Chl in 2000s as compared to have been reported. It covers latitudes from 30°N–50°N longitudes 60°W–0°W, two phytoplankton blooms take place: a spring bloom that follows stratification upper layers, fall due nutrient entrainment through deepening mixed layer. In 1980s, were similar amplitude over...
Abstract The effect of salinity on the formation barrier layer (BL) in southeastern Arabian Sea (SEAS) is investigated using an ocean general circulation model. In accordance with previous studies, runoff distribution and India–Sri Lanka passage have a strong impact realism simulated area at seasonal time scales. model simulates BL pattern fairly good agreement available observations. Eulerian Lagrangian approaches show that formed by two complementary processes, arrival low-salinity surface...
Recent observational studies provided preliminary insights on the interannual variability of Bay Bengal (BoB) Sea Surface Salinity (SSS), but are limited by poor data coverage. Here, we describe BoB SSS and its driving processes from a regional eddy-permitting ocean general circulation model forced interannually varying air-sea fluxes altimeter-derived discharges major rivers over past two decades. Simulated variations compare favorably with both in situ satellite largest boreal fall three...
An ocean model has been forced with NCEP reanalysis fluxes over 1948–2003 to evaluate the pathways and timescales associated uptake of anthropogenic CO 2 North Pacific. The reveals that there are two principal regions uptake, first in region bounded by 35–45°N 140–180°E, second along a band between 10–20°N 120°W 180°E. For both these regions, dominant timescale variability is seasonal, maximum occurring during winter being close zero or slightly negative summer when integrated basin. A...