A5082293060- Plant Water Relations and Carbon Dynamics
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Remote Sensing in Agriculture
- Wind and Air Flow Studies
- Climate variability and models
- Urban Heat Island Mitigation
- Atmospheric chemistry and aerosols
- Hydrology and Watershed Management Studies
- Soil Moisture and Remote Sensing
- Oceanographic and Atmospheric Processes
- Soil and Unsaturated Flow
- Climate change impacts on agriculture
- Atmospheric aerosols and clouds
- Plant responses to elevated CO2
- Ocean Waves and Remote Sensing
- Agriculture Sustainability and Environmental Impact
- Geophysics and Gravity Measurements
- Climate change and permafrost
- Greenhouse Technology and Climate Control
- Water-Energy-Food Nexus Studies
- Irrigation Practices and Water Management
- Plant Ecology and Soil Science
- Crop Yield and Soil Fertility
- Tree-ring climate responses
Centre d'Études Spatiales de la Biosphère
2016-2025
Institut de Recherche pour le Développement
2010-2025
Centre National de la Recherche Scientifique
2010-2024
Université Toulouse III - Paul Sabatier
2013-2024
Université de Toulouse
2009-2024
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2020-2023
Centre Hospitalier René-Dubos
1999-2015
Météo-France
2003-2009
Centre National d'Études Spatiales
2009
Laboratoire d'Aérologie
2004-2007
The Second Global Soil Wetness Project (GSWP-2) is an initiative to compare and evaluate 10-year simulations by a broad range of land surface models under controlled conditions. A major product GSWP-2 the first global gridded multimodel analysis state variables fluxes for use meteorologists, hydrologists, engineers, biogeochemists, agronomists, botanists, ecologists, geographers, climatologists, educators. Simulations 13 from five nations have gone into production analysis. are driven...
Abstract. Soil water content (SWC) sensors are widely used for scientific studies or the management of agricultural practices. The most common sensing techniques provide an estimate volumetric soil based on dielectric permittivity. These include frequency domain reflectometry (FDR), time (TDR), capacitance and even remote-sensing such as ground-penetrating radar (GPR) microwave-based techniques. Here, we will focus (FDR) more specifically questioning their factory calibration, which does not...
In Europe, the heterogeneous features of crop systems with majority small to medium sized agricultural holdings, and diversity rotations, require high-resolution information estimate cropland Net Ecosystem Exchange (NEE) its two main components Gross (GEE) Respiration (RECO). this context, paper presents an assimilation Sentinel-2 indices eddy covariance measurements at selected European flux sites in a new modified version Vegetation Photosynthesis Model (VPRM). VRPM is data-driven model...
In the French Mediterranean basin large city of Marseille and its industrialized suburbs (oil plants in Fos‐Berre area) are major pollutant sources that cause frequent hazardous pollution episodes, especially summer when intense solar heating enhances photochemical activity sea breeze circulation redistributes pollutants farther north countryside. This paper summarizes findings 5 years research on southern France related mesoscale transport dilution within Field Experiment to Constraint...
In the micrometeorology community, it is well known that turbulent fluxes measured with eddy covariance (EC) systems do not usually equal available energy. Hence, qualitative knowledge of impact different vegetation types, and climatic variables on this 'nonclosure' essential. This study analyzed a unique database EC flux measurements covering 8 growing seasons 3 crops (maize, wheat, rapeseed) cultivated over two close agricultural sites (FR-Lam FR-Aur) in southwestern France. For data...
Abstract. A CO2-responsive land surface model (the ISBA-A-gs of Météo-France) is used to simulate photosynthesis and Leaf Area Index (LAI) in southwestern France for a 3-year period (2001–2003). domain about 170 000 km2 covered at spatial resolution 8 km. The capability reproduce the seasonal interannual variability LAI regional scale, assessed with satellite-derived products. One originates from CYCLOPES programme using SPOT/VEGETATION data, two products are based on MODIS data. comparison...
Abstract. In semiarid areas, agricultural production is restricted by water availability; hence, efficient management a major issue. The design of tools providing regional estimates evapotranspiration (ET), one the most relevant balance fluxes, may help sustainable resources. Remote sensing provides periodic data about actual vegetation temporal dynamics (through normalized difference index, NDVI) and availability under stress surface temperature Tsurf), which are crucial factors controlling...
Quantifying and partitioning evapotranspiration (ET) of agricultural ecosystems in various environmental settings enable studying the site-specific determinants plant water use. The aim study was to conduct reliable reproducible field-scale ET into its component fluxes soil evaporation (E) transpiration (T) from stable isotope analysis (δ2H δ18O). Isotope-based methods, because their methodological independence other, traditional, experimental or data-driven approaches, are...
An accurate determination of turbulent exchanges between the ocean and atmosphere is a prerequisite to identify assess mechanisms interaction that control part variability in two media over wide range spatial temporal scales. extended dataset for estimating air–sea fluxes (representing nearly 5700 h turbulence measurements) has been collected since 1992 during six dedicated experiments performed Atlantic Ocean Mediterranean Sea. This paper presents methodology used through successive...
Abstract. The use of scintillometers to determine sensible heat fluxes is now common in studies land-atmosphere interactions. main interest these instruments due their ability quantify energy distributions at the landscape scale, as they can calculate flux values over long distances, contrast Eddy Covariance systems. However, scintillometer data do not provide a direct measure flux, but require additional data, such Bowen ratio (β), values. either be measured using systems or derived from...
The aim of the Programme Océan Multidisciplinaire Méso Echelle (POMME) was to study formation and subduction 11°–13°C waters in northeast Atlantic (21°–15°W 38°–45°N). An extensive oceanic atmospheric data set collected over 1 year during period September 2000–October 2001. Owing importance energy water exchanges between top layers ocean atmosphere process, a surface heat, freshwater, momentum budget has been computed combining use satellite products, situ data, model outputs. This compared...
Simulating the carbon-water fluxes at more widely distributed meteorological stations based on sparsely and unevenly eddy covariance flux is needed to accurately understand cycle of terrestrial ecosystems. We established a new framework consisting machine learning, determination coefficient (R2), Euclidean distance, remote sensing (RS), simulate daily net ecosystem carbon dioxide exchange (NEE) water (WF) Eurasian using random forest model or/and RS. The NEE WF datasets with RS-based...
Using surface temperature as a signature of the energy balance is way to quantify spatial distribution evapotranspiration and water stress. In this work, we used new dual-source model named Soil Plant Atmosphere Remote Sensing Evapotranspiration (SPARSE) based on Two Sources Energy Balance (TSEB) rationale which solves equations for soil canopy. SPARSE can be (i) retrieve vegetation stress levels from known (ii) predict transpiration, evaporation, given levels. The main innovative feature...
An accurate assessment of evapotranspiration (ET) is crucially needed at the basin scale for studying hydrological processes and water balance especially from upstream to downstream. In mountains, this term poorly understood because various challenges, including vegetation complexity, plant diversity, lack available data in situ direct measurement ET difficult complex terrain. The main objective work was investigate potential a Two-Source-Energy-Balance model (TSEB) driven by Landsat MODIS...
The use of soil moisture (SM) measurements from satellites has grown in recent years, fostering the development new products at high resolution. This opens possibility using them for certain applications that were normally carried out situ data. We investigated this hypothesis through two main analyses high-resolution satellite-based (SBSM) combined microwave with thermal and optical data: (1) Disaggregation based on Physical And Theoretical scale Change (DISPATCH) and, (2) Soil Moisture...
Abstract Turbulent fluxes of momentum, sensible heat and water vapour were calculated using both the eddy covariance (EC) inertial dissipation (ID) methods applied to data collected on board research vessel La Thalassa during 40 days EQUALANT99 oceanographic campaign. The aim this experiment was establish accurate parametrizations air–sea for equatorial Atlantic area from a large dataset. However, accuracy turbulent measured aboard ships is strongly affected by distortion airflow patterns...
The relaxed eddy accumulation (REA) method has become a standard tool for scalar flux measurements near the surface during field experiments. With this technique, turbulent fluxes of relatively slowly reacting species are measured using difference in mean concentration between air samples accumulated updrafts and downdrafts. A prototype accumulator adapted to air–sea aboard research vessel was developed at Centre National de Recherches Meteorologiques (CNRM) implemented on board L'Atalante...