A5046413368- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Marine and coastal ecosystems
- Climate variability and models
- Meteorological Phenomena and Simulations
- Spectroscopy and Laser Applications
- Air Quality Monitoring and Forecasting
- Tropical and Extratropical Cyclones Research
- Ionosphere and magnetosphere dynamics
- Pharmaceutical and Antibiotic Environmental Impacts
- Isotope Analysis in Ecology
- Microbial Community Ecology and Physiology
- Oceanographic and Atmospheric Processes
- Aquatic Ecosystems and Phytoplankton Dynamics
- Precipitation Measurement and Analysis
- Oil Spill Detection and Mitigation
- Ocean Acidification Effects and Responses
- Antibiotic Resistance in Bacteria
- African Botany and Ecology Studies
- Marine Biology and Ecology Research
- Air Quality and Health Impacts
- Antibiotic Use and Resistance
- Methane Hydrates and Related Phenomena
Observatoire de Physique du Globe de Clermont-Ferrand
2015-2024
Université Clermont Auvergne
2013-2024
Centre National de la Recherche Scientifique
2015-2024
Laboratoire de Météorologie Physique
2015-2024
Clermont Université
2018
University of New Caledonia
2018
Observatoire des Sciences de l'Univers de la Réunion
2006-2016
Météo-France
2009-2015
Laboratoire de l'Atmosphère et des Cyclones
1999-2015
Écologie Marine Tropicale des Océans Pacifique et Indien
2013-2015
Cloud droplets contain dynamic and complex pools of highly heterogeneous organic matter, resulting from the dissolution both water-soluble carbon in atmospheric aerosol particles gas-phase soluble species, are constantly impacted by chemical, photochemical, biological transformations. samples two summer events, characterized different air masses physicochemical properties, were collected at Puy de Dôme station France, concentrated on a strata-X solid-phase extraction cartridge directly...
Abstract. The ozone profile records of a large number limb and occultation satellite instruments are widely used to address several key questions in research. Further progress some domains depends on more detailed understanding these data sets, especially their long-term stability mutual consistency. To this end, we made systematic assessment 14 sounders that, together, provide than three decades global measurements. In particular, considered the latest operational Level-2 by SAGE II, III,...
Abstract. Since the nineties, atmospheric measurement systems have been deployed at Reunion Island, mainly for monitoring composition in framework of NDSC/NDACC (Network Detection Stratospheric Change/Network Atmospheric Composition Change). The location Island presents a great interest because there are very few multi-instrumented stations tropics and particularly southern hemisphere. In 2012, new observatory was commissioned Maïdo 2200 m above sea level: it hosts various instruments...
Abstract. For the last 25 years, CO-PDD (Cézeaux-Aulnat-Opme-puy de Dôme) has evolved to become a full instrumented platform for atmospheric research. It received credentials as national observing in France and is internationally recognized global station GAW (Global Atmosphere Watch) network. reference site of European research infrastructures ACTRIS (Aerosol Cloud Trace gases Research Infrastructure) ICOS (Integrated Carbon Observing System). The located on top puy Dôme mountain (1465 m...
Abstract. Spectral measurements of BrO using zenith-sky and off-axis viewing geometries are combined in a linear multiple regression retrieval algorithm to provide stratospheric tropospheric vertical columns. One year measurement data investigated over Reunion-Island (20.9° S, 55.5° E), from August 2004 June 2005. A comparison between the columns retrieved at 45°, 80°, 85°, 87.5° 92.5° solar zenith angles photochemical simulations initialized by chemical fields 3-D-CTM SLIMCAT further...
We show carbon monoxide (CO) distributions at different vertical levels over the subtropical southern Indian Ocean, analyzing an observation campaign using Fourier transform infrared (FTIR) solar absorption spectrometry performed in 2007 Reunion Island (21°S, 55°E). The CO pollution detected by FTIR measurements during a doubling of total columns Southern Hemisphere biomass burning season. Using correlative data from Measurement Pollution Troposphere instrument and back trajectories...
Secondary organic aerosols (SOA) produced in the atmosphere from sequential oxidation of biogenic or anthropogenic volatile compounds (VOC) represent a significant part atmospheric aerosol. Aerosol particles can act as cloud condensation nuclei be scavenged by droplets, where carbon undergo chemical and biological transformations. Due to its high complexity, nontargeted analysis FT-ICR MS (Fourier-transform ion cyclotron resonance mass spectrometry) has been used characterize dissolved...
A statistical analysis of 295 cloud samples collected at the Puy de Dôme station in France (PUY), covering period 2001–2018, was conducted using principal component (PCA), agglomerative hierarchical clustering (AHC), and partial least squares (PLS) regression. Our model classified water on basis their chemical concentrations dynamical history air masses estimated with back-trajectory calculations. The split our dataset into two sets, i.e., first set characterized by westerly marine...
Abstract. Ground-based high spectral resolution Fourier-transform infrared (FTIR) solar absorption spectroscopy is a powerful remote sensing technique to obtain information on the total column abundances and vertical distribution of various constituents in atmosphere. This work presents results from two FTIR measurement campaigns 2002 2004, held at Ile de La Réunion (21° S, 55° E). These represent first observations carried out southern (sub)tropical site. They serve initiation regular,...
Abstract. This paper presents a climatology and trends of tropospheric ozone in the Southwestern Indian Ocean (Reunion Island) South Africa (Irene Johannesburg). study is based on multi-instrumental dataset: PTU-O3 ozonesondes, DIAL LIDAR MOZAIC airborne instrumentation. The seasonal profiles at Reunion Island have been calculated from two different data sets: ozonesondes LIDAR. climatological are similar, except austral summer when show greater values free troposphere, upper troposphere...
Abstract This study presents a high‐resolution dynamical analysis of Volatile Organic Compound (VOC) concentrations measured from March 11 to April 4 2019 at Réunion Island during the BIO‐MAÏDO (Bio‐physicochemistry tropical clouds Maïdo: processes and impacts on secondary organic aerosols formation) campaign. We detail chemical that govern atmospheric VOC two targeted sites western slope Island: Petite France (PF), 950 m above sea level (a.s.l.) Maïdo Observatory (MO), 2150 a.s.l. A...
Abstract. We present here the results obtained during an intensive field campaign conducted in framework of French “BIO-MAÏDO” (Bio-physico-chemistry tropical clouds at Maïdo (Réunion Island): processes and impacts on secondary organic aerosols' formation) project. This study integrates exhaustive chemical microphysical characterization cloud water March–April 2019 Réunion (Indian Ocean). Fourteen samples have been collected along slope this mountainous island. Comprehensive these is...
Abstract The goal of the Sea2Cloud project is to study interplay between surface ocean biogeochemical and physical properties, fluxes atmosphere, ultimately their impact on cloud formation under minimal direct anthropogenic influence. Here we present an interdisciplinary approach, combining atmospheric physics chemistry with marine biogeochemistry, during a voyage 41° 47°S in March 2020. In parallel ambient measurements composition seawater describe semicontrolled experiments characterize...
Convective tropical cyclones initiate exchanges of mass and energy between the troposphere stratosphere. Recent analyses ozone water vapor measurements from Measurements Ozone by Airbus In‐Service Aircraft (MOZAIC) data [ Suhre et al ., 1997] suggest that stratospheric inputs to can occur in tropics near zones deep convection. In present paper, we analyze a case study spectacular stratosphere‐troposphere exchange directly linked strong cyclone Marlene, occurred Mauritius Reunion Island on...
Daily measurements of tropospheric ozone at La Reunion Island (55 E, 21 S) in July 1998 show that layers are quasi‐permanent the troposphere between 6 and 10 km with values reaching 80 to 100 ppbv. Meridional cross sections potential vorticity reveal these related tropopause folds beneath subtropical jet. Folding is persistent extends over a considerable longitude range from mid‐Atlantic mid‐Pacific. We suggest this structure due convergent flow associated descent branch Hadley circulation...
Abstract. This study provides an analysis of cirrus cloud properties at midlatitude in the southern part France from ground-based and spaceborne lidars. A climatology their evolution over more than 12 yr is presented compared to other mid-latitude climatological studies. Cirrus clouds occur ~37% total observation time remain quasi-constant across seasons with a variation within ~5% around mean occurrence. Similar results are obtained CALIOP lidar, difference occurrence between both...
The first operations at the new High-altitude Maïdo Observatory La Réunion began in 2013. Lidar Calibration Campaign (MALICCA) was organized there April 2013 and has focused on validation of thermodynamic parameters (temperature, water vapor, wind) measured with many instruments including very large lidar for vapor temperature profiles. aim this publication consists providing an overview different deployed during campaign their status, some targeted scientific questions associated...
The Oxygenated Compounds in the Tropical Atmosphere: Variability and Exchanges (OCTAVE) campaign aimed to improve assessment of budget role oxygenated volatile organic compounds (OVOCs) tropical regions, especially over oceans, relying on an integrated approach combining situ measurements, satellite retrievals, modeling. As part OCTAVE, (VOCs) were measured using a comprehensive suite instruments Reunion Island (21.07° S, 55.38° E) from 7 March 2 May 2018. VOCs at receptor site Maïdo...
Abstract. Eighteen free amino acids (FAAs) were quantified in cloud water sampled at the Puy de Dôme station (PUY – France) during 13 events. This quantification has been performed without concentration or derivatization, using liquid chromatography hyphened to mass spectrometry (LC-MS) and standard addition method correct for matrix effects. Total concentrations of FAAs (TCAAs) vary from 1.2 7.7 µM, Ser (serine) being most abundant AA (23.7 % on average) but with elevated deviation,...
Abstract. New particle formation (NPF) in the free troposphere (FT) is thought to be a significant source of particles over oceans. The entrainment initially formed marine FT further suspected major contributor cloud condensation nuclei (CCN) number concentrations boundary layer (BL). Yet, little known about process and, more broadly, composition FT, which remains poorly explored due access difficulties. Here we report measurements performed April 2018 at Maïdo Observatory with nitrate-based...