Valentin Duflot, Université de la Réunion – CNRS – Météo-France, Saint-Denis de La Réunion, France
Pierre Tulet, Université de la Réunion – CNRS – Météo-France, Saint-Denis de La Réunion, France
Olivier Flores, UMR PVBMT, Peuplements Végétaux et Bioagresseurs en Milieu Tropical, Saint-Denis de La Réunion, France
Christelle Barthe, Université de la Réunion – CNRS – Météo-France, Saint-Denis de La Réunion, France
Aurélie Colomb, Université Clermont Auvergne, CNRS Laboratoire de Météorologie Physique (LaMP)
Laurent Deguillaume, Université Clermont Auvergne, CNRS Laboratoire de Météorologie Physique (LaMP)
Mickael Vaïtilingom, Université Clermont Auvergne, CNRS Laboratoire de Météorologie Physique (LaMP)
Anne Perring, National Oceanic and Atmospheric Administration, Boulder, CO, USA
Alex Huffman, University of Denver, Denver, CO, USA
MarkT. Hernandez, UC Boulder, Boulder, CO, USA
Karine Sellegri, Université Clermont Auvergne, CNRS Laboratoire de Météorologie Physique (LaMP),
Ellis Robinson, National Oceanic and Atmospheric Administration, Boulder, CO, USA
David J. O'Connor, Technological University DublinFollow
Odessa M .Gomez, UC Boulder, Boulder, CO, USA
Frédéric Burnet, CNRM, Centre National de la Recherche Météorologique, UMR3589, CNRS – Météo-France
Thierry Bourrianne, CNRM, Centre National de la Recherche Météorologique, UMR3589, CNRS – Météo-France
Dominique Strasberg, UMR PVBMT, Peuplements Végétaux et Bioagresseurs en Milieu Tropical, Saint-Denis de La Réunion, France
Manon Rocco, Université Clermont Auvergne, CNRS Laboratoire de Météorologie Physique (LaMP) France
Allan K Bertram, University of British Columbia, Vancouver, BC, Canada
Patrick Chazette, Université de Versailles Saint-Quentin-en-Yvelines, France
Julien Totems, Université de Versailles Saint-Quentin-en-Yvelines, France
Pierre Stamenoff, Observatoire des Sciences de l’Univers de La Réunion (OSUR), UMS3365, Saint-Denis de la Réunion, France
Jean-Marc Metzger, Observatoire des Sciences de l’Univers de La Réunion (OSUR), UMS3365, Saint-Denis de la Réunion, France
Mathilde Chabasset, CNRS – Météo-France, Saint-Denis de La Réunion, France
Clothilde Rousseau, CNRS – Météo-France, Saint-Denis de La Réunion, France
Eric Bourrianne, CNRS – Météo-France, Saint-Denis de La Réunion, France
Martine Sancelme, CNRS – Météo-France, Saint-Denis de La Réunion, France
Anne-Marie Delort, CNRS – Météo-France, Saint-Denis de La Réunion, France
Rachel E. Wegener, University of Denver, Denver, CO, USA
Cedric Chou, University of British Columbia, Vancouver, BC, Canada
Pablo Elizondo, University of British Columbia, Vancouver, BC, Canada

Document Type

Article

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This item is available under a Creative Commons License for non-commercial use only

Disciplines

1.4 CHEMICAL SCIENCES

Publication Details

Atmos.Chem.Phys.,19,10591–10618,2019

Abstract

The Forests gAses aeRosols Clouds Exploratory (FARCE) campaign was conducted in March–April 2015 on the tropical island of La Réunion. For the first time, several scientific teams from different disciplines collaborated to provide reference measurements and characterization of LaRéunionvegetation,volatileorganiccompounds(VOCs), biogenic VOCs (BVOCs), (bio)aerosols and composition of clouds, with a strong focus on the Maïdo mountain slope area. The main observations obtained during this 2-month intensivefieldcampaignaresummarized.Theyincludecharacterizations of forest structure, concentrations of VOCs and precursors emitted by forests, aerosol loading and optical properties in the planetary boundary layer (PBL), formation of new particles by nucleation of gas-phase precursors, icenucleatingparticlesconcentrations,andbiologicalloadingin bothcloud-freeandcloudyconditions.SimulationsandmeasurementsconfirmthattheMaïdoObservatorylieswithinthe PBL from late morning to late evening and that, when in the PBL, the main primary sources impacting the Maïdo Observatory are of marine origin via the Indian Ocean and of biogenic origin through the dense forest cover. They also show that(i)themarinesourceprevailslessandlesswhilereaching the observatory; (ii) when in the PBL, depending on the localizationofahorizontalwindshear,theMaïdoObservatory canbeaffectedbyairmassescomingdirectlyfromtheocean and passing over the Maïdo mountain slope, or coming from inland; (iii) bio-aerosols can be observed in both cloud-free and cloudy conditions at the Maïdo Observatory; (iv) BVOC emissions by the forest covering the Maïdo mountain slope can be transported upslope within clouds and are a potential cause of secondary organic aerosol formation in the aqueous phase at the Maïdo Observatory; and (v) the simulation of dynamicsparameters,emittedBVOCsandcloudlifecyclein the Meso-NH model are realistic, and more advanced MesoNH simulations should use an increased horizontal resolution (100m) to better take into account the orography and improve the simulation of the wind shear front zone within which lies the Maïdo

DOI

https://doi.org/10.5194/acp-19-10591-2019

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