A5070379714- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- COVID-19 impact on air quality
- Atmospheric and Environmental Gas Dynamics
- Geophysics and Gravity Measurements
- Climate variability and models
- Aeolian processes and effects
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Meteorological Phenomena and Simulations
- Oil, Gas, and Environmental Issues
- Coastal and Marine Management
- Ionosphere and magnetosphere dynamics
- Tropical and Extratropical Cyclones Research
- Vehicle emissions and performance
- Building Energy and Comfort Optimization
- Wind and Air Flow Studies
- COVID-19 Pandemic Impacts
- Integrated Energy Systems Optimization
- Ocean Acidification Effects and Responses
- Energy and Environment Impacts
- Allergic Rhinitis and Sensitization
Max Planck Institute for Meteorology
2020-2024
University of Bremen
2023-2024
Centre National de la Recherche Scientifique
2013-2023
Laboratoire de Météorologie Dynamique
2016-2023
École Polytechnique
2016-2023
Université Paris-Saclay
2017-2023
Sorbonne Université
2013-2023
École Normale Supérieure
2017-2023
Institut Pierre-Simon Laplace
2012-2022
Université Paris Sciences et Lettres
2017-2022
Abstract We use the global Community Earth System Model to investigate response of secondary pollutants (ozone O 3 , organic aerosols SOA) in different parts world modified emissions primary during COVID‐19 pandemic. quantify respective effects reductions NOx and volatile carbon (VOC) emissions, which, most cases, affect oxidants opposite ways. Using model simulations, we show that level has been reduced by typically 40% China February 2020 similar amounts many areas Europe North America...
Abstract. In order to fight the spread of global COVID-19 pandemic, most world's countries have taken control measures such as lockdowns during a few weeks months. These had significant impacts on economic and personal activities in many countries. Several studies using satellite surface observations reported important changes spatial temporal distributions atmospheric pollutants greenhouse gases. Global regional chemistry-transport model are being performed analyze impact these distribution...
Abstract. In June and July 2016 the Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) project organised a major international field campaign southern (SWA) including measurements from three inland ground supersites, urban sites Cotonou Abidjan, radiosondes, research aircraft. A significant range of different weather situations were encountered during this period, monsoon onset. The purpose paper is to characterise large-scale setting for as well synoptic mesoscale...
Abstract The energy demand for heating and cooling buildings is changing with global warming. Using proxies of climate-driven based on the Degree-Days methodology applied to thirty climate model simulations, we show that, over all continental areas, trends were weak, by less than 10% from 1950 1990, but become stronger 1990 2030, more 10%. With multi-model mean, increasing in are pronounced decreasing heating. changes cooling, however, highly variable depending individual ranging a few...
Abstract Using the CAM‐chem Model, we simulate response of chemical species in free troposphere to scenarios primary pollutant emission reductions during COVID‐19 pandemic. Zonally averaged ozone Northern Hemisphere spring and summer is found be 5%–15% lower than 19‐yr climatological values, good agreement with observations. About one third this anomaly attributed reduction scenario air traffic pandemic, another surface emissions, remainder 2020 meteorological conditions, including...
Abstract An intercomparison of four regional air quality models is performed in the tropical megacity São Paulo with perspective developing a forecasting system based on model ensemble. Modeled concentrations main regulated pollutants are compared combined observations center, after analyzing spatial scale representativeness monitoring stations. During three contrasting periods characterized by different types pollution events, hourly carbon monoxide (CO), nitrogen oxides (NOx), sulfur...
Abstract. The climate in the Arctic has warmed much more quickly last 2 to 3 decades than at mid-latitudes, i.e., during amplification (AA) period. Radiative forcing is influenced both directly and indirectly by aerosols. However, their observation from ground or airborne instruments challenging, thus measurements are sparse. In this study, total aerosol optical depth (AOD) determined top-of-atmosphere reflectance Advanced Along-Track Scanning Radiometer (AATSR) on board ENVISAT over snow...
Bacterial meningitis is an ongoing threat for the population of African Meningitis Belt, a region characterized by highest incidence rates worldwide. The determinants disease dynamics are still poorly understood; nevertheless, it often advocated that climate and mineral dust have large impact. Over last decade, several studies investigated this relationship at scale. In analysis, we scaled down to district-level weekly scale (which used in-year response emerging epidemics), wavelet phase...
Abstract. The presence of airborne aerosols affects the meteorology as it induces a perturbation in radiation budget, number cloud condensation nuclei and micro-physics. Those effects are difficult to model at regional scale chemistry-transport models usually driven by distinct meteorological or data. In this paper, coupling CHIMERE with WRF using OASIS3-MCT coupler is presented. fields along aerosol optical properties exchanged through high frequency order aerosol–radiation interactions....
Abstract. In the framework of Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) project, tropospheric chemical composition large cities along Gulf Guinea is studied using Weather and Research Forecast CHIMERE regional models. Simulations are performed for May–July 2014 period, without with biomass burning emissions. Model results compared to satellite data surface measurements. Using numerical tracer release experiments, it shown that emissions Central impacting aerosol...
The indirect effects of aerosol are particularly important over regions where meteorological conditions and content favourable to cloud formation. This was observed during the Intensive Cloud Aerosol Measurement Campaign (IMPACT) (European Integrated project on Climate Air quality Interaction (EUCAARI) project) in Benelux Union May 2008. To better understand this formation variability, have been included within WRF-CHIMERE online model. By comparing model results aircraft measurements...
Abstract The lockdown period (March–May 2020) during the COVID‐19 pandemic in Europe led to a reduction anthropogenic emissions of primary pollutants. For three‐quarters over 1,100 available monitoring stations, average nitrogen dioxide (NO 2 ) concentrations decreased by at least 2.7 μg·m −3 (or 25%) compared with recorded same previous seven years. This was not specific urban or rural areas because relative similar magnitude both areas. ozone (O 3 response differed spatially, positive...
Abstract Total and wet mineral dust deposition has been monitored since 2006 at three Sahelian stations in Senegal, Mali, Niger, respectively the weekly event time scale. Average annual deposited mass fluxes range from 75 to 183 g m −2 yr −1 , west east. Deposition exhibit a clear seasonal cycle Mali Niger. High result an optimum phasing between concentration precipitation: maximum occurring beginning of season, after before precipitation maximum. The contribution total varies 67% 8%...
Abstract. During the monsoon season, pollutants emitted by large coastal cities and biomass burning plumes originating from central Africa have complex transport pathways over southern West (SWA). The Dynamics–Aerosol–Chemistry–Cloud Interactions in (DACCIWA) field campaign has provided numerous dynamical chemical measurements around super-site of Savè Benin (≈185 km away coast), which allows quantification relative contribution advected pollutants. Through combination situ ground with...
Abstract. As part of the Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) project, an airborne campaign was designed to measure a large range atmospheric constituents, focusing on effect anthropogenic emissions regional climate. The presented study details results French ATR42 research aircraft, which aimed characterize gas-phase, aerosol and cloud properties region during field carried out June/July 2016 combination with German Falcon 20 British Twin Otter aircraft....
<strong class="journal-contentHeaderColor">Abstract.</strong> The complex vertical distribution of aerosols over coastal southern West Africa (SWA) is investigated using airborne observations and numerical simulations. Observations were gathered on 2 July 2016 offshore Ghana Togo, during the field phase Dynamics-Aerosol-Chemistry-Cloud Interactions in project. This was only flight conducted ocean which a downward-looking lidar operational. aerosol loading lower troposphere includes...
Abstract. An air quality model ensemble is used to represent the current state-of-the-art in atmospheric modeling, composed of two global forecasts and regional simulations. The assessment focuses on both carbonaceous aerosols, i.e. black carbon (BC) organic aerosol (OA), five trace gases during aircraft campaigns EMeRGe (Effect Megacities Transport Transformation Pollutants Regional Global Scales) project. These campaigns, designed with similar flight plans for Europe Asia, along identical...
Abstract. Low-level stratiform clouds (LLSCs) covering a large area appear frequently during the wet monsoon season in southern West Africa. This region is also place where different types of aerosols coexist, including biomass burning coming from central and Africa emitted by local anthropogenic activities. We investigate indirect semi-direct effects these on life cycle LLSCs conducting case study based airborne ground-based observations field campaign...
Abstract. The aerosol direct and indirect effects are studied over west Africa in the summer of 2016 using coupled WRF-CHIMERE regional model including aerosol–cloud interaction parameterization. First, a reference simulation is performed compared with observations acquired during Dynamics-aerosol-chemistry-cloud interactions West (DACCIWA) field campaign which took place June July 2016. Sensitivity experiments also designed to gain insights into impact aerosols dominating atmospheric...
Abstract. In order to fight the spread of global COVID-19 pandemic, most world countries have taken control measures such as lockdowns during a few weeks months. These had significant impacts on economic and personal activities in many countries. Several studies using satellite surface observations reported important changes spatial temporal distributions atmospheric pollutants greenhouse gases. Global regional chemistry-transport model are being performed analyze impact these distribution...
Abstract. The Arctic climate has changed significantly over the past two to three decades. Aerosols play various roles in radiative forcing Arctic, both directly and indirectly, depending on changes loading composition. However, their observation from ground or with airborne instruments is challenging thus measurements are sparse. In this study, total Aerosol Optical Depth (AOD) determined top-of-atmosphere reflectance by Advanced Along-Track Scanning Radiometer (AATSR) aboard ENVISAT snow...
Abstract. Carbon monoxide, CO, and fine atmospheric particulate matter, PM2.5, are analyzed over the Guinean Gulf coastal region using WRF-CHIMERE modeling system observations during beginning of monsoon 2006 (from May to July), corresponding Africa Multidisciplinary Monsoon Analysis (AMMA) campaign period. Along coast, contribution long-range pollution transport CO or PM2.5 concentrations is important. The desert dust concentration decreases from ∼ 38 % in 5 July. biomass burning Central...