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Discussion papers
https://doi.org/10.5194/acp-2019-341
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-341
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Apr 2019

Research article | 30 Apr 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Preliminary results from the FARCE 2015 campaign: multidisciplinary study of the forests–gases–aerosols–clouds system on the tropical island of La Réunion

Valentin Duflot1,2, Pierre Tulet1, Olivier Flores3, Christelle Barthe1, Aurélie Colomb4, Laurent Deguillaume4, Mickael Vaïtilingom4,a, Anne Perring5,6, Alex Huffman7, Mark T. Hernandez8, Karine Sellegri4, Ellis Robinson5,6, David J. O'Connor7,b, Odessa M. Gomez8, Frédéric Burnet9, Thierry Bourrianne9, Dominique Strasberg3, Allan K. Bertram10, Patrick Chazette11, Julien Totems11, Jacques Fournel3, Pierre Stamenoff2, Jean-Marc Metzger2, Mathilde Chabasset1, Clothilde Rousseau1, Eric Bourrianne1,c, Martine Sancelme12, Anne-Marie Delort12, Rachel E. Wegener7, Cedric Chou10, and Pablo Elizondo10 Valentin Duflot et al.
  • 1Laboratoire de l'Atmosphère et des Cyclones (LACy), UMR8105, Université de la Réunion – CNRS – Météo-France, Saint-Denis de La Réunion, France
  • 2Observatoire des Sciences de l'Univers de La Réunion (OSUR), UMS3365, Saint-Denis de la Réunion, France
  • 3UMR PVBMT, Peuplements Végétaux et Bioagresseurs en Milieu Tropical, Saint-Denis de La Réunion, France
  • 4Université Clermont Auvergne, CNRS Laboratoire de Météorologie Physique (LaMP), 63000 Clermont-Ferrand, France
  • 5National Oceanic and Atmospheric Administration, Boulder, CO, USA
  • 6Cooperative Institute for Research in Environmental Science, Boulder, CO, USA
  • 7Department of Chemistry and Biochemistry, University of Denver, Denver, CO, USA
  • 8Department of Civil and Environmental Engineering, UC Boulder, Boulder, CO, USA
  • 9CNRM, Centre National de la Recherche Météorologique, UMR3589, CNRS – Météo-France, Toulouse, France
  • 10Department of Chemistry, University of British Columbia, Vancouver, BC, Canada
  • 11Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Commissariat Energie Atomique et aux énergies alternatives – CNRS – Université de Versailles Saint-Quentin-en-Yvelines, 91191 Gif sur Yvette Cedex, France
  • 12Université Clermont Auvergne, CNRS, Sigma-Clermont, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont-Ferrand, France
  • anow at: Laboratoire de Recherche en Géosciences et Energies (LaRGE), Université des Antilles, Pointe-à-Pitre, Guadeloupe, France
  • bnow at: School of Chemical and Pharmaceutical Sciences, Technological University Dublin, Ireland
  • cnow at: ATMO Occitanie, Pérols, France

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 La Réunion vegetation, (biogenic) volatile organic compounds (BVOCs), (bio)aerosols and composition of clouds, with a strong focus on the Maïdo mount slope area. The main observations obtained during this two-month intensive field campaign are summarized. They include characterizations 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, ice nucleating particles concentrations, and biological loading in both cloud-free and cloudy conditions. Simulations and measurements confirm that the Maïdo Observatory lies within the PBL from late morning to late evening and that, when in the PBL, the main primary sources impacting the Maïdo Observatory are from marine origin via the Indian Ocean and from biogenic origin through the dense forest cover. They also show that (i) the marine source prevails less and less while reaching the Observatory, (ii) when in the PBL, depending on the localization of a horizontal windshear, the Maïdo Observatory can be affected by air masses coming directly from the ocean and passing over the Maïdo mount slope, or coming from inland, (iii) bioaerosols can be observed in both cloud-free and cloudy conditions at the Maïdo Observatory, (iv) BVOCs emissions by the forest covering the Maïdo mount slope can be transported upslope within clouds and are a potential way of secondary organic aerosols formation in aqueous phase at the Maïdo Observatory, (v) the simulation of dynamics parameters, emitted BVOCs and clouds life cycle in the Meso-NH model are realistic, and more advanced Meso-NH simulations should use an increased horizontal resolution (100  m) to better take into account the orography and improve the simulation of the windshear front zone within which lies the Maïdo Observatory. The FARCE campaign provides a unique set of multi-disciplinary data and results that can be used to better understand the forest–gases–aerosols–clouds system in an insular tropical environment.

Valentin Duflot et al.
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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 La Réunion vegetation, (biogenic) volatile organic compounds (BVOCs), (bio)aerosols and composition of clouds, with a strong focus on the Maïdo mount slope area.
The Forests gAses aeRosols Clouds Exploratory (FARCE) campaign was conducted in March–April 2015...
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