A5057569278- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Remote Sensing in Agriculture
- Calibration and Measurement Techniques
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Spectroscopy and Laser Applications
- Climate variability and models
- Geochemistry and Geologic Mapping
- Urban Heat Island Mitigation
- Meteorological Phenomena and Simulations
- Plant Water Relations and Carbon Dynamics
- Vehicle emissions and performance
- French Urban and Social Studies
- COVID-19 impact on air quality
- Aeolian processes and effects
- Remote Sensing and LiDAR Applications
- Marine and coastal ecosystems
- Impact of Light on Environment and Health
- Geology and Paleoclimatology Research
- Climate Change Policy and Economics
- Land Use and Ecosystem Services
- Cryospheric studies and observations
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2025
CEA Paris-Saclay
2016-2025
Laboratoire de Mesure du Carbone 14
2016-2025
Laboratoire des Sciences du Climat et de l'Environnement
2016-2025
Centre National de la Recherche Scientifique
2014-2024
Université de Versailles Saint-Quentin-en-Yvelines
2014-2024
Université Paris-Saclay
2017-2024
European Centre for Medium-Range Weather Forecasts
2020
Institut Pierre-Simon Laplace
2005-2019
CEA Grenoble
2015
Urban heat island is among the most evident aspects of human impacts on earth system. Here we assess diurnal and seasonal variation surface urban intensity (SUHII) defined as temperature difference between area suburban measured from MODIS. Differences in SUHII are analyzed across 419 global big cities, several potential biophysical socio-economic driving factors. Across show that average annual daytime (1.5 ± 1.2 °C) higher than nighttime (1.1 0.5 (P < 0.001). But no correlation found...
This paper introduces the new Polarization and Directionality of Earth's Reflectances (POLDER) instrument. The spaceborne POLDER sensor, which is selected to fly aboard Japanese ADEOS satellite scheduled for launch in early 1996, has nearly completed phase C its development at Centre National d'Etudes Spatiales, French space agency. To prepare 1996 mission, airborne prototypes are being tested evaluated framework various measurement campaigns. sensor designed collect global observations...
The considerable cessation of human activities during the COVID-19 pandemic has affected global energy use and CO2 emissions. Here we show unprecedented decrease in fossil emissions from January to April 2020 was 7.8% (938 Mt with a +6.8% 2-{\sigma} uncertainty) when compared period last year. In addition other emerging estimates COVID impacts based on monthly supply or estimated parameters, this study contributes another step that constructed near-real-time daily emission inventories...
The polarization measurements achieved by the POLDER instrument on ADEOS‐1 are used for remote sensing of aerosols over land surfaces. key advantage using polarized observations is their ability to systematically correct ground contribution, whereas classical approach natural light fails. estimation surface polarizing properties from has been examined in a previous paper. Here we consider how optical thickness δ 0 and Ångstrom exponent α derived backscattered particles. inversion scheme...
Properly handling satellite data to constrain the inversion of CO 2 sources and sinks at Earth surface is a challenge motivated by limitations current observation network. In this paper we present Bayesian inference scheme tackle issue. It based on same theoretical principles as most inversions flask network but uses variational formulation rather than pure matrix‐based one in order cope with large amount data. The minimization algorithm iteratively computes optimum solution problem well an...
Aerosol concentration and cloud droplet radii derived from space-borne measurements are used to explore the effect of aerosols on microphysics. Cloud size is found be largest (14 micrometers) over remote tropical oceans smallest (6 highly polluted continental areas. Small droplets also present in clouds downwind continents. By using estimates coupled with aerosol load, a statistical mean relationship derived. The appears better correlated an index that representative column number under some...
Abstract. This synthesis discusses the emissions of carbon dioxide from fossil-fuel combustion and cement production. While much is known about these emissions, there still that unknown details surrounding emissions. explores our knowledge in terms why concern them; how they are calculated; major global efforts on inventorying their global, regional, national totals at different spatial temporal scales; distributed grids (i.e., maps); transported models; uncertainties associated with aspects...
Abstract. Instruments dedicated to aerosol monitoring are recently available and the POLDER (POLarization Directionality of Earth's Reflectances) instrument on board PARASOL (Polarization &amp; Anisotropy Reflectances for Atmospheric Sciences coupled with Observations from a Lidar) mission is one them. By measuring spectral, angular polarization properties radiance at top atmosphere, in coordination other A-Train instruments, provides optical depths (AOD) as well several microphysical...
Abstract. A globally integrated carbon observation and analysis system is needed to improve the fundamental understanding of global cycle, our ability project future changes, verify effectiveness policies aiming reduce greenhouse gas emissions increase sequestration. Building an requires transformational advances from existing sparse, exploratory framework towards a dense, robust, sustained in all components: anthropogenic emissions, atmosphere, ocean, terrestrial biosphere. The paper...
The CALIOP (Cloud‐Aerosol Lidar with Orthogonal Polarization) layer product is used for a multimodel evaluation of the vertical distribution aerosols. Annual and seasonal aerosol extinction profiles are analyzed over 13 sub‐continental regions representative industrial, dust, biomass burning pollution, from 2007–2009 observations AeroCom (Aerosol Comparisons between Observations Models) 2000 simulations. An mean height diagnostic (Z α ) defined to quantitatively assess models' performance....
We constructed a near-real-time daily CO2 emission dataset, namely the Carbon Monitor, to monitor variations of emissions from fossil fuel combustion and cement production since January 1st 2019 at national level with near-global coverage on basis, potential be frequently updated. Daily are estimated diverse range activity data, including: hourly electrical power generation data 29 countries, monthly indices industry processes 62 countries/regions, mobility road transportation 416 cities...
Abstract. Atmospheric concentration measurements are used to adjust the daily monthly budget of fossil fuel CO2 emissions Paris urban area from prior estimates established by Airparif local air quality agency. Five atmospheric monitoring sites available, including one at top Eiffel Tower. The inversion is based on a Bayesian approach, and relies an transport model with spatial resolution 2 km boundary conditions global coarse grid model. adjusts knowledge about anthropogenic biogenic fluxes...
Abstract. In this study, we provide a comprehensive analysis of aerosol interaction with warm boundary layer clouds over the South-East Atlantic. We use and cloud parameters derived from MODIS observations, together co-located CALIPSO estimates altitudes, to derive statistical relationships between concentration properties. The products are used differentiate cases mixed cloud-aerosol layers where is located well-above top. This technique allows us obtain more reliable indirect effect than...
Polarization and Directionality of the Earth's Reflectances (POLDER) is a new instrument devoted to global observation polarization directionality solar radiation reflected by Earth‐atmosphere system. It will fly onboard ADEOS platform in 1996. This paper outlines improvements expected from POLDER description atmospheric aerosols water vapor over land, surface bidirectional reflectances. then gives detailed operational algorithms which are implemented “land atmosphere land” processing line....
This paper analyzes new lidar measurements from space over regions of biomass burning activity. The height the aerosol layers deduced observations is compared to mixing layer top diagnosed numerical weather forecasts, identify whether or not aerosols are directly injected in free troposphere. During July and August 2006, best cases (limited cloudiness, high density fires) found South Africa Northern Australia. Over these regions, close height, which a strong indication that within layer....
We evaluate aerosol indirect radiative forcing simulated by the Model for Integrated Research on Atmospheric Global Exchange (MIRAGE). Although explicit measurements of do not exist, many links between aerosols and are available can be used evaluation. These include cloud condensation nuclei concentration, ratio droplet number to number, column water, effective radius, optical depth, correlation albedo forcing. The CCN concentration MIRAGE agrees with supersaturations larger than 0.1% but...
Two months of spaceborne POLDER polarization measurements have been used to generate empirical surface bidirectional distribution functions (BPDFs). Eleven classes defined based on a classification and vegetation index. Within each class, the polarized reflectance was found rather homogeneous. The is highly anisotropic varies between 0 close backscattering direction, few percent in forward scattering direction. For given observation geometry, about twice as large over pixels classified...