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3. Design and evaluation of BOOGIE: a collector for the analysis of cloud composition and processes: Biological, Organics, Oxidants, soluble Gases, inorganic Ions and metal Elements.

Author

Vaitilingom, Mickael, Bernard, Christophe, Ribeiro, Mickael, Berthod, Christophe, Bianco, Angelica, and Deguillaume, Laurent

Subjects
METAL ions, COMPUTATIONAL fluid dynamics, CLOUD droplets, ATMOSPHERIC chemistry, OXIDIZING agents
Abstract

Cloud/fog droplets comprise a myriad of chemical compounds and are living environments in which microorganisms are present and active. These chemical and biological elements can evolve in various ways within the cloud system, and the aqueous transformation of chemicals contributes to atmospheric chemistry. In situ cloud studies are fundamental in this sense, because they enable us to study the variability in cloud chemical composition as a function of environmental conditions and assess their potential for transforming chemical compounds. To achieve this objective, cloud water collectors have been developed in recent decades to recover water from clouds and fogs using different designs and collection methods. In this study, a new active ground-based cloud collector was developed and tested for sampling cloud water to assess the cloud microbiology and chemistry. This new instrument, BOOGIE, is an easy mobile sampler for cloud water collection with the objective of being cleanable and sterilisable, respecting chemical and microbial cloud integrity, and presenting an efficient collection rate of cloud water. Computational fluid dynamics simulations were performed to theoretically assess the capture of cloud droplets by this new sampler. Few turbulences have been observed inside the collector and a 50 % collection efficiency cutoff of 10 µm has been estimated. The collector was deployed at Puy de Dôme station under cloudy conditions for evaluation. The water collection rates were measured at 156 ± 52 mL h-1 for a collection of 17 cloud events; considering the measured liquid water content, the sampling efficiency of this new collector has been estimated at 87.2 ± 8.6 % over the same set of cloud events. BOOGIE was compared with other active cloud collectors commonly used by the scientific community (Cloud Water Sampler and Caltech Active Strand Cloud Collector version 2). Four cloud events were collected; the three samplers presented similar collection efficiencies (between 79 % and 88 % on average). The measured ionic composition was comparable even if differences were highlighted between collectors, the consequence of different designs, and the intrinsic homogeneity in the chemical composition within the cloud system. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Molecular composition of clouds: a comparison between samples collected at tropical (Réunion Island, France) and mid-north (Puy de Dôme, France) latitudes.

Author

Pailler, Lucas, Deguillaume, Laurent, Lavanant, Hélène, Schmitz, Isabelle, Hubert, Marie, Nicol, Edith, Ribeiro, Mickaël, Pichon, Jean-Marc, Vaïtilingom, Mickaël, Dominutti, Pamela, Burnet, Frédéric, Tulet, Pierre, Leriche, Maud, and Bianco, Angelica

Subjects
CARBON content of water, DISSOLVED organic matter, MOLECULAR clouds, CHEMICAL formulas, PRINCIPAL components analysis, TERPENES
Abstract

The composition of dissolved organic matter of cloud water has been investigated through non-targeted high-resolution mass spectrometry on only a few samples that were mostly collected in the Northern Hemisphere in the USA, Europe and China. There remains, therefore, a lack of measurements for clouds located in the Southern Hemisphere, under tropical conditions and influenced by forest emissions. As a matter of fact, the comparison of the composition of clouds collected in different locations is challenging since the methodology for the analysis and data treatment is not standardized. In this work, the chemical composition of three samples collected at Réunion Island (REU) during the BIO-MAÏDO field campaign, in the Indian Ocean, with influences from marine, anthropogenic and biogenic (tropical) emissions, is investigated and compared to the chemical composition of samples collected at the Puy de Dôme (PUY) observatory in France. The same methodology of analysis and data treatment was employed, producing a unique dataset for the investigation of the molecular composition of organic matter in cloud water. Besides the analysis of elemental composition, we investigated the carbon oxidation state (OSC) of dissolved organic matter, finding that overall samples collected at PUY are more oxidized than those collected at REU. Molecular formulas were also classified based on stoichiometric elemental ratios, showing the high frequency and abundance of reduced organic compounds, classified as lipids (LipidC), in this matrix, which led to a search for terpene oxidation products in cloud water samples. To better discriminate between samples collected at PUY and REU, statistical analysis (principal component analysis and agglomerative hierarchical clustering) was performed on the ensemble of molecular formulas and their intensities. Samples collected at REU have a different composition from samples collected at PUY, which is mainly linked to different primary sources, the processing of organic matter in cloud water and the influence of different primary emissions at the two locations. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Measurement report: Bio-physicochemistry of tropical clouds at Maïdo (Réunion, Indian Ocean): overview of results from the BIO-MAÏDO campaign.

Author

Leriche, Maud, Tulet, Pierre, Deguillaume, Laurent, Burnet, Frédéric, Colomb, Aurélie, Borbon, Agnès, Jambert, Corinne, Duflot, Valentin, Houdier, Stéphan, Jaffrezo, Jean-Luc, Vaïtilingom, Mickaël, Dominutti, Pamela, Rocco, Manon, Mouchel-Vallon, Camille, El Gdachi, Samira, Brissy, Maxence, Fathalli, Maroua, Maury, Nicolas, Verreyken, Bert, and Amelynck, Crist

Subjects
TURBULENT boundary layer, MICROBIOLOGICAL aerosols, VOLATILE organic compounds, OXALIC acid, AIR masses, TRADE winds, AIRWAYS (Aeronautics)
Abstract

The BIO-MAÏDO (Bio-physicochemistry of tropical clouds at Maïdo: processes and impacts on secondary organic aerosols formation) campaign was conducted from 13 March to 4 April 2019 on the tropical island of Réunion. The main objective of the project was to improve understanding of cloud impacts on the formation of secondary organic aerosols (SOA) from biogenic volatile organic compound (BVOC) precursors in a tropical environment. Instruments were deployed at five sites: a receptor site, Maïdo Observatory (MO) at 2165 m a.s.l. and four sites along the slope of the Maïdo mountain. Observations include measurements of volatile organic compounds (VOCs) and characterization of the physical, chemical and biological (bacterial diversity and culture-based approaches) properties of aerosols and cloud water. Turbulent parameters of the boundary layer, radiative fluxes and emissions fluxes of BVOCs from the surrounding vegetation were measured to help interpret observed chemical concentrations in the different phases. Dynamical analyses showed two preferred trajectory routes for air masses arriving at MO during the daytime. Both trajectories correspond to return branches of the trade winds associated with upslope thermal breezes, where air masses likely encountered cloud processing. The highest mixing ratios of oxygenated VOCs (OVOCs) were measured above the site located in the endemic forest and the highest contribution of OVOCs to total VOCs at MO. Chemical compositions of particles during daytime showed higher concentrations of oxalic acid, a tracer of cloud processing and photochemical aging, and a more oxidized organic aerosol at MO than at other sites. Approximately 20 % of the dissolved organic compounds were analyzed. Additional analyses by ultra-high-resolution mass spectrometry will explore the complexity of the missing cloud organic matter. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Measurement Report: Bio-physicochemistry of tropical clouds at Maïdo (Réunion Island, Indian Ocean): overview of results from the BIO-MAÏDO campaign

Author

Leriche, Maud, primary, Tulet, Pierre, additional, Deguillaume, Laurent, additional, Burnet, Frédéric, additional, Colomb, Aurélie, additional, Borbon, Agnès, additional, Jambert, Corinne, additional, Duflot, Valentin, additional, Houdier, Stéphan, additional, Jaffrezo, Jean-Luc, additional, Vaïtilingom, Mickaël, additional, Dominutti, Pamela, additional, Rocco, Manon, additional, Mouchel-Vallon, Camille, additional, El Gdachi, Samira, additional, Brissy, Maxence, additional, Fathalli, Maroua, additional, Maury, Nicolas, additional, Verreyken, Bert, additional, Amelynck, Crist, additional, Schoon, Niels, additional, Gros, Valérie, additional, Pichon, Jean-Marc, additional, Ribeiro, Mickael, additional, Pique, Eric, additional, Leclerc, Emmanuel, additional, Bourrianne, Thierry, additional, Roy, Axel, additional, Moulin, Eric, additional, Barrie, Joël, additional, Metzger, Jean-Marc, additional, Péris, Guillaume, additional, Guadagno, Christian, additional, Bhugwant, Chatrapatty, additional, Tibere, Jean-Mathieu, additional, Tournigand, Arnaud, additional, Freney, Evelyn, additional, Sellegri, Karine, additional, Delort, Anne-Marie, additional, Amato, Pierre, additional, Joly, Muriel, additional, Baray, Jean-Luc, additional, Renard, Pascal, additional, Bianco, Angelica, additional, Réchou, Anne, additional, and Payen, Guillaume, additional

Published
2023
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10. Supplementary material to "Measurement Report: Bio-physicochemistry of tropical clouds at Maïdo (Réunion Island, Indian Ocean): overview of results from the BIO-MAÏDO campaign"

Author

Leriche, Maud, primary, Tulet, Pierre, additional, Deguillaume, Laurent, additional, Burnet, Frédéric, additional, Colomb, Aurélie, additional, Borbon, Agnès, additional, Jambert, Corinne, additional, Duflot, Valentin, additional, Houdier, Stéphan, additional, Jaffrezo, Jean-Luc, additional, Vaïtilingom, Mickaël, additional, Dominutti, Pamela, additional, Rocco, Manon, additional, Mouchel-Vallon, Camille, additional, El Gdachi, Samira, additional, Brissy, Maxence, additional, Fathalli, Maroua, additional, Maury, Nicolas, additional, Verreyken, Bert, additional, Amelynck, Crist, additional, Schoon, Niels, additional, Gros, Valérie, additional, Pichon, Jean-Marc, additional, Ribeiro, Mickael, additional, Pique, Eric, additional, Leclerc, Emmanuel, additional, Bourrianne, Thierry, additional, Roy, Axel, additional, Moulin, Eric, additional, Barrie, Joël, additional, Metzger, Jean-Marc, additional, Péris, Guillaume, additional, Guadagno, Christian, additional, Bhugwant, Chatrapatty, additional, Tibere, Jean-Mathieu, additional, Tournigand, Arnaud, additional, Freney, Evelyn, additional, Sellegri, Karine, additional, Delort, Anne-Marie, additional, Amato, Pierre, additional, Joly, Muriel, additional, Baray, Jean-Luc, additional, Renard, Pascal, additional, Bianco, Angelica, additional, Réchou, Anne, additional, and Payen, Guillaume, additional

Published
2023
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11. Regional Modeling of Aerosol Chemical Composition at the Puy de Dôme (France)

Author

Barbet, Christelle, Deguillaume, Laurent, Chaumerliac, Nadine, Leriche, Maud, Berger, Alexandre, Freney, Evelyn, Colomb, Aurélie, Sellegri, Karine, Patryl, Luc, Armand, Patrick, Abarbanel, Henry, Series editor, Braha, Dan, Series editor, Érdi, Péter, Series editor, Friston, Karl, Series editor, Haken, Hermann, Series editor, Jirsa, Viktor, Series editor, Kacprzyk, Janusz, Series editor, Kaneko, Kunihiko, Series editor, Kelso, Scott, Series editor, Kirkilionis, Markus, Series editor, Kurths, Jürgen, Series editor, Nowak, Andrzej, Series editor, Qudrat-Ullah, Hassan, Series editor, Reichl, Linda, Series editor, Schuster, Peter, Series editor, Schweitzer, Frank, Series editor, Sornette, Didier, Series editor, Thurner, Stefan, Series editor, Steyn, Douw G., editor, and Chaumerliac, Nadine, editor

Published
2016
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12. Molecular composition of clouds: a comparison between samples collected at tropical (Réunion Island, France) and mid-north (puy de Dôme, France) latitudes.

Author

Pailler, Lucas, Deguillaume, Laurent, Lavanant, Hélène, Schmitz, Isabelle, Hubert, Marie, Nicol, Edith, Ribeiro, Micakël, Pichon, Jean-Marc, Vaïtilingom, Mickaël, Dominutti, Pamela, Burnet, Frédéric, Tulet, Pierre, Leriche, Maud, and Bianco, Angelica

Subjects
CARBON content of water, MOLECULAR clouds, DISSOLVED organic matter, CHEMICAL formulas, PRINCIPAL components analysis, TERPENES
Abstract

The composition of cloud water dissolved organic matter has been investigated through non-targeted high resolution mass spectrometry only on few samples, mostly collected in the Northern hemisphere, in USA, Europe and China. Nevertheless, there is a lack of measurements for clouds located in the Southern Hemisphere, under tropical conditions and influenced by forest emissions. Moreover, the comparison of the composition of cloud samples collected in different locations is not trivial, since the methodology for the analysis and data treatment are not standardized. In this work, the chemical composition of three samples collected at Reunion Island (REU) during the BIO-MAÏDO field campaign, in the Indian Ocean, with influences from marine, anthropogenic and biogenic (tropical) emissions is investigated and compared to the chemical composition of samples collected at the puy de Dôme (PUY) observatory, in France. The same methodology of analysis and data treatment was employed, producing a unique dataset for the investigation of molecular composition of organic matter in cloud water. Besides the analysis of elemental composition, we investigated the carbon oxidation state (OSC) of dissolved organic matter, finding that overall samples collected at PUY are more oxidized than those collected at REU. Molecular formulas were also classified based on stoichiometric elemental ratios, showing the high frequency and abundance of reduced organic compounds, classified as lipids (LipidC), in this matrix, which led to search for terpenes oxidation products in cloud water samples. To better discriminate between samples collected at PUY and at REU, statistical analysis (principal component analysis and agglomerative hierarchical clustering) was performed on the ensemble of molecular formulas and their intensities. Samples collected at REU, have a different composition from samples collected at PUY, mainly linked to the processing of organic matter in cloud water, but also to the influence of different primary emissions at the two locations. [ABSTRACT FROM AUTHOR]

Published
2023
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19. Evaluating the potential secondary contribution of photosensitized chemistry to OH production in aqueous aerosolsElectronic supplementary information (ESI) available: Supporting Information (PDF), including additional information about the measurement of OH radical formation, extraction protocol for the aerosol samples, description of UPLC/UV methods for detecting trimethylphenol (TMP), literature studies on the concentrations of NO3−, H2O2, HULIS, and phenols/nitrophenols in aerosols and/or cloud/fog conditions, and a comparison of previously measured OH formation rates in the literature. See DOI: https://doi.org/10.1039/d4ea00103f

Author

Petersen-Sonn, Emma A., Brigante, Marcello, Deguillaume, Laurent, Jaffrezo, Jean-Luc, Perrier, Sébastien, and George, Christian

Abstract

This study explores the potential contribution of secondary production of OH radicals in aerosols and cloud/fog conditions arising from brown carbon (BrC) triplet state chemistry. For this purpose, extracts of brown carbon from atmospheric aerosols from Grenoble, France, were analyzed for their ability to produce triplet states from the degradation of a common triplet state probe, 2,4,6-trimethylphenol (TMP). This ability of brown carbon to produce triplet states was compared to that of three photosensitizers, where it was found that vanillin (VL) showed a similar rate of degradation of the probe and was hence chosen as an alternative to BrC in aqueous aerosols to investigate OH formation from triplet states. The rates of OH formation from the triplet states were compared to those from nitrate anions (NO3−) and hydrogen peroxide (H2O2), which are well-known sources of OH radicals in the aqueous phase, and a species that is structurally similar to VL, 4-hydroxybenzaldehyde (4HB). VL and 4HB both showed a 1–2 orders of magnitude higher rate of secondary OH formation than NO3−, while it was similar or one order of magnitude smaller than H2O2. To evaluate the influence of the different OH radical sources in aqueous aerosols and cloud/fog conditions, the concentrations of the species were summarized from the literature. Considering the concentrations of HULISs in aerosols, the rates of secondary OH formation from BrC triplet states could potentially represent a significant source of OH in the atmospheric aqueous phase under some circumstances. This study shows the relevance of further investigations into the role of triplet states in impacting atmospheric oxidative capacity and studying other effects of triplet states in aerosols, a field that is, until now, still not fully understood.

Published
2024
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24. Exploring metabolic acclimation of the cloud microflora to contrasting summer day and winter night conditions using metatranscriptomics and fluxomics approaches

Author

Joly, Muriel, primary, Jarrige, Domitille, additional, Vyscocil, Jonathan, additional, Rossi, Florent, additional, Judon, Céline, additional, Bringel, Françoise, additional, Muller, Emilie E.L., additional, Vuilleumier, Stéphane, additional, Nadalig, Thierry, additional, Portais, Jean-Charles, additional, Peyriga, Lindsay, additional, Bellvert, Floriant, additional, Kulyk, Hanna, additional, Bianco, Angelica, additional, Deguillaume, Laurent, additional, Delort, Anne-Marie, additional, and Amato, Pierre, additional

Published
2023
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27. Assessing the efficiency of water-soluble organic compound biodegradation in clouds under various environmental conditions

Author

Pailler, Lucas, primary, Wirgot, Nolwenn, additional, Joly, Muriel, additional, Renard, Pascal, additional, Mouchel-Vallon, Camille, additional, Bianco, Angelica, additional, Leriche, Maud, additional, Sancelme, Martine, additional, Job, Aurélie, additional, Patryl, Luc, additional, Armand, Patrick, additional, Delort, Anne-Marie, additional, Chaumerliac, Nadine, additional, and Deguillaume, Laurent, additional

Published
2023
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29. Bio-physicochemistry of tropical clouds at Maïdo (Réunion Island, Indian Ocean): overview of results from the BIO-MAÏDO campaign

Author

Leriche, Maud, Tulet, Pierre, Deguillaume, Laurent, Burnet, Frédéric, Colomb, Aurélie, Borbon, Agnès, Jambert, Corinne, Duflot, Valentin, Houdier, Stéphan, Jaffrezo, Jean-Luc, Vaïtilingom, Mickaël, Mouchel-Vallon, Camille, Dominutti, Pamela, Rocco, Manon, Gdachi, Samira, Brissy, Maxence, Fathalli, Maroua, Maury, Nicolas, Verreyken, Bert, Amelynck, Crist, Schoon, Niels, Gros, Valérie, Pichon, Jean-Marc, Ribeiro, Mickael, Pique, Eric, Leclerc, Emmanuel, Bourrianne, Thierry, Roy, Axel, Moulin, Eric, Barrie, Joël, Metzger, Jean-Marc, Péris, Guillaume, Guadagno, Christian, Bhugwant, Chatrapatty, Tibere, Jean-Mathieu, Tournigand, Arnaud, Freney, Evelyn, Sellegri, Karine, Delort, Anne-Marie, Amato, Pierre, Joly, Muriel, Baray, Jean-Luc, Renard, Pascal, Bianco, Angelica, Réchou, Anne, Payen, Guillaume, Laboratoire de Météorologie Physique (LaMP), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Centre ESCER, Université du Québec à Montréal = University of Québec in Montréal (UQAM), Laboratoire d'aérologie (LAERO), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Centre national de recherches météorologiques (CNRM), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, Institut des Géosciences de l’Environnement (IGE), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Recherche en Géosciences et Energies [UR2_1] (LARGE), Université des Antilles (UA), Institut de Chimie de Clermont-Ferrand (ICCF), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne), Université Clermont Auvergne (UCA)-Université Clermont Auvergne (UCA), Department of Chemistry, University of Ghent, Ghent, Belgium, Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Departement of Chemistry, University of Ghent, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Observatoire des Sciences de l'Univers de La Réunion (OSU-Réunion), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR), ATMO-Réunion, ANR, BIO-MAÏDO, OCTAVE, European Project: 654109,H2020,H2020-INFRAIA-2014-2015,ACTRIS-2(2015), and ANR-18-CE01-0013,BIO-MAIDO,Bio-physicochimie des nuages tropicaux au Maïdo (Île de la Réunion) : processus et impacts sur la formation des aérosols organiques secondaires(2018)

Subjects
Atmospheric chemistry, Field campaign, tropical atmosphere, [SDU]Sciences of the Universe [physics], COV, Réunion Island, cloud, aerosols
Abstract

The BIO-MAÏDO (Bio-physicochemistry of tropical clouds at Maïdo (Réunion Island): processes and impacts on secondary organic aerosols formation) campaign was conducted from the 13th of March to the 4th of April 2019 on the tropical Réunion Island and implied several scientific teams and state-of-the-art instrumentation. The campaign was part of the BIO-MAÏDO project with the main objective is to improve our understanding of cloud impacts on the formation of secondary organic aerosols (SOA) from biogenic volatile organic compounds (BVOC) precursors in a tropical environment. Instruments were deployed at five sites: a receptor site, the Maïdo observatory (MO) at 2165 m asl, and four sites along the slope of the Maïdo mountain. The obtained dataset includes measurements of the gas-phase mixings ratio of volatile organic compounds (VOC), the characterization of the physical, chemical, and biological (bacterial diversity) properties of aerosols and the characterization of the physical, chemical and biological (identification of viable bacteria through culture-based approaches) properties of the cloud water. In addition, the turbulent parameters of the boundary layer, radiative fluxes, and emissions fluxes of BVOC from the surrounding vegetation were measured to help with the interpretation of the observed chemical concentrations in the different phases. Dynamical analyses using back-trajectories show two preferred trajectories routes for air masses arriving at MO during the daytime both corresponding to the return branches of the trade winds associated with the up-slopes thermal breezes, and both influenced by marine boundary layer and endemic forest below the Maïdo observatory. Additional analysis based on a high-resolution Meso-NH simulation for a typical cloudy day indicates that air masses sampled at MO likely encountered cloud processing during its transport along the slope. The highest mixing ratio of oxygenated VOC (OVOC) were measured above the site located in the endemic forest and the highest contribution of OVOC to total VOC at MO. Chemical composition of particles during the daytime shows that organic aerosol is more oxidized at MO than at other sites along the slope. This is a signature of photochemical aerosols aging along the slope. A higher concentration of oxalic acid at a site below MO indicates this oxidation occurs potentially through cloud processing. Despite an in-depth analysis of organic compounds in cloud water, around 80% on average of dissolved organic compounds is undefined highlighting the complexity of the cloud organic matter. The BIO-MAÏDO project is focusing on the analysis of observations and processes using numerical simulations: a 0D cloud chemistry model including biodegradation by bacteria in cloud water and a high-resolution 3D model coupling dynamical, microphysical and chemical processes.

Published
2023

30. Evaluation of the Sources, Precursors, and Processing of Aerosols at a High-Altitude Tropical Site

Author

Dominutti, Pamela, Chevassus, Emmanuel, Baray, Jean-Luc, Jaffrezo, Jean-Luc, Borbon, Agnès, Colomb, Aurélie, Deguillaume, Laurent, El Gdachi, Samira, Houdier, Stephan, Leriche, Maud, Metzger, Jean-Marc, Rocco, Manon, Tulet, Pierre, Sellegri, Karine, Freney, Evelyn, Institut des Géosciences de l’Environnement (IGE), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Météorologie Physique (LaMP), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Laboratoire d'aérologie (LAERO), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, Centre ESCER, Université du Québec à Montréal = University of Québec in Montréal (UQAM), Observatoire des Sciences de l'Univers de La Réunion (OSU-Réunion), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR), ANR-18-CE01-0013,BIO-MAIDO,Bio-physicochimie des nuages tropicaux au Maïdo (Île de la Réunion) : processus et impacts sur la formation des aérosols organiques secondaires(2018), and European Project: 654109,H2020,H2020-INFRAIA-2014-2015,ACTRIS-2(2015)

Subjects
Atmospheric Science, Cloud processing, Positive matrix factorization, Space and Planetary Science, Geochemistry and Petrology, ToF-ACSM, [SDE.IE]Environmental Sciences/Environmental Engineering, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [SDE.MCG]Environmental Sciences/Global Changes, Secondary organic aerosols, Aqueous-phase chemistry, Southern Hemisphere, [SDE.ES]Environmental Sciences/Environmental and Society
Abstract

International audience; This work presents the results from a set of aerosol- and gas-phase measurements collected during the BIO-MAIDÖ field campaign in Reunion ́ between March 8 and April 5, 2019. Several offline and online sampling devices were installed at the Maidö Observatory (MO), a remote high-altitude site in the Southern Hemisphere, allowing the physical and chemical characterization of atmospheric aerosols and gases. The evaluation of short-lived gas-phase measurements allows us to conclude that air masses sampled during this period contained little or no anthropogenic influence. The dominance of sulfate and organic species in the submicron fraction of the aerosol is similar to that measured at other coastal sites.Carboxylic acids on PM10 showed a significant contribution of oxalic acid, a typical tracer of aqueous processed air masses, increasing at the end of the campaign. This result agrees with the positive matrix factorization analysis of the submicron organic aerosol, where more oxidized organic aerosols (MOOAs) dominated the organic aerosol with an increasing contribution toward the end of the campaign. Using a combination of air mass trajectories (model predictions), it was possible to assess the impact of aqueous phase processing on the formation of secondary organic aerosols(SOAs). Our results show how specific chemical signatures and physical properties of air masses, possibly affected by cloud processing, can be identified at Reunion. ́ These changes in properties are represented by a shift in aerosol size distribution to large diameters and an increased contribution of secondary sulfate and organic aerosols after cloud processing.

Published
2022

32. Measurement Report: Bio-physicochemistry of tropical clouds at Maïdo (Réunion Island, Indian Ocean): overview of results from the BIO-MAÏDO campaign.

Author

Leriche, Maud, Tulet, Pierre, Deguillaume, Laurent, Burnet, Frédéric, Colomb, Aurélie, Borbon, Agnès, Jambert, Corinne, Duflot, Valentin, Houdier, Stéphan, Jaffrezo, Jean-Luc, Vaïtilingom, Mickaël, Dominutti, Pamela, Rocco, Manon, Mouchel-Vallon, Camille, Gdachi, Samira El, Brissy, Maxence, Fathalli, Maroua, Maury, Nicolas, Verreyken, Bert, and Amelynck, Crist

Subjects
TURBULENT boundary layer, VOLATILE organic compounds, OXALIC acid, AIR masses, CARBONACEOUS aerosols, TRADE winds, AIRWAYS (Aeronautics), BACTERIAL diversity, MICROBIOLOGICAL aerosols
Abstract

The BIO-MAÏDO (Bio-physicochemistry of tropical clouds at Maïdo (Réunion Island): processes and impacts on secondary organic aerosols formation) campaign was conducted from the 13th of March to the 4th of April 2019 on the tropical Réunion Island and implied several scientific teams and state-of-the-art instrumentation. The campaign was part of the BIO-MAÏDO project with the main objective is to improve our understanding of cloud impacts on the formation of secondary organic aerosols (SOA) from biogenic volatile organic compounds (BVOC) precursors in a tropical environment. Instruments were deployed at five sites: a receptor site, the Maïdo observatory (MO) at 2165 m asl, and four sites along the slope of the Maïdo mountain. The obtained dataset includes measurements of the gas-phase mixing ratio of volatile organic compounds (VOC), the characterization of the physical, chemical, and biological (bacterial diversity) properties of aerosols and the characterization of the physical, chemical and biological (identification of viable bacteria through culture-based approaches) properties of the cloud water. In addition, the turbulent parameters of the boundary layer, radiative fluxes, and emissions fluxes of BVOC from the surrounding vegetation were measured to help with the interpretation of the observed chemical concentrations in the different phases. Dynamical analyses show two preferred trajectories routes for air masses arriving at MO during the daytime both corresponding to the return branches of the trade winds associated with the up-slopes thermal breezes. These air masses likely encountered cloud processing during transport along the slope. The highest mixing ratio of oxygenated VOC (OVOC) were measured above the site located in the endemic forest and the highest contribution of OVOC to total VOC at MO. Chemical composition of particles during the daytime shows a higher concentration of oxalic acid and a more oxidized organic aerosol at MO than at other sites along the slope. This is a signature of photochemical aerosols aging along the slope potentially influenced by cloud processing. Despite an in-depth analysis of organic compounds in cloud water, around 80 % on average of dissolved organic compounds is undefined highlighting the complexity of the cloud organic matter. [ABSTRACT FROM AUTHOR]

Published
2023
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36. Influence of strong iron-binding ligands on cloud water oxidant capacity

Author

González, Aridane G., Bianco, Angelica, Boutorh, Julia, Cheize, Marie, Mailhot, Gilles, Delort, Nne-marie, Planquette, Helene, Chaumerliac, Nadine, Deguillaume, Laurent, Sarthou, Geraldine, González, Aridane G., Bianco, Angelica, Boutorh, Julia, Cheize, Marie, Mailhot, Gilles, Delort, Nne-marie, Planquette, Helene, Chaumerliac, Nadine, Deguillaume, Laurent, and Sarthou, Geraldine

Abstract

Iron (Fe) plays a dual role in atmospheric chemistry: it is involved in chemical and photochemical reactivity and serves as a micronutrient for microorganisms that have recently been shown to produce strong organic ligands. These ligands control the reactivity, mobility, solubility and speciation of Fe, which have a potential impact on Fe bioavailability and cloud water oxidant capacity. In this work, the concentrations of Fe-binding ligands and the conditional stability constants were experimentally measured for the first time by Competitive Ligand Exchange-Adsorptive Cathodic Stripping Voltammetry (CLE-ACSV) technique in cloud water samples collected at puy de Dôme (France). The conditional stability constants, which indicate the strength of the Fe-ligand complexes, are higher than those considered until now in cloud chemistry (mainly Fe-oxalate). To understand the effect of Fe complexation on cloud water reactivity, we used the CLEPS cloud chemistry model. According to the model results, we found that Fe complexation impacts the hydroxyl radical formation rate: contrary to our expectations, Fe complexation by natural organic ligands led to an increase in hydroxyl radical production. These findings have important impacts on cloud chemistry and the global iron cycle.

Published
2022
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39. Insights into tropical cloud chemistry in Réunion (Indian Ocean): results from the BIO-MAÏDO campaign

Author

Dominutti, Pamela A., primary, Renard, Pascal, additional, Vaïtilingom, Mickaël, additional, Bianco, Angelica, additional, Baray, Jean-Luc, additional, Borbon, Agnès, additional, Bourianne, Thierry, additional, Burnet, Frédéric, additional, Colomb, Aurélie, additional, Delort, Anne-Marie, additional, Duflot, Valentin, additional, Houdier, Stephan, additional, Jaffrezo, Jean-Luc, additional, Joly, Muriel, additional, Leremboure, Martin, additional, Metzger, Jean-Marc, additional, Pichon, Jean-Marc, additional, Ribeiro, Mickaël, additional, Rocco, Manon, additional, Tulet, Pierre, additional, Vella, Anthony, additional, Leriche, Maud, additional, and Deguillaume, Laurent, additional

Published
2022
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45. Box Model Intercomparison of Cloud Chemistry

Author

Barth, Mary C., primary, Ervens, Barbara, additional, Herrmann, Hartmut, additional, Tilgner, Andreas, additional, McNeill, V. Faye, additional, Tsui, William Gang, additional, Deguillaume, Laurent, additional, Chaumerliac, Nadine, additional, Carlton, Annmarie, additional, and Lance, Sara M., additional

Published
2021
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