Preliminary results from the FARCE 2015 campaign: multidisciplinary study of the forest–gas–aerosol–cloud system on the tropical island of La Réunion - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2019

Preliminary results from the FARCE 2015 campaign: multidisciplinary study of the forest–gas–aerosol–cloud system on the tropical island of La Réunion

Pierre Tulet
Aurélie Colomb
Anne Perring
  • Fonction : Auteur
Alex Huffman
  • Fonction : Auteur
Mark T Hernandez
  • Fonction : Auteur
Karine Sellegri
  • Fonction : Auteur
  • PersonId : 842104
Ellis Robinson
  • Fonction : Auteur
Odessa M Gomez
  • Fonction : Auteur
Manon Rocco
  • Fonction : Auteur
  • PersonId : 1052650
Allan K. Bertram
  • Fonction : Auteur
  • PersonId : 1042054
Mathilde Chabasset
  • Fonction : Auteur
Martine Sancelme
  • Fonction : Auteur
Anne-Marie Delort
Rachel E Wegener
  • Fonction : Auteur
Cedric Chou
  • Fonction : Auteur
Pablo Elizondo
  • Fonction : Auteur

Résumé

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, volatile organic compounds (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 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 of marine origin via the Indian Ocean and of bio-genic 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 lo-calization of a horizontal wind shear, the Maïdo Observatory can be affected by air masses coming directly from the ocean 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 dynamics parameters, emitted BVOCs and cloud 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 wind shear front zone within which lies the Maïdo Observatory. Using various observations and simulations, this work draws up an inventory of the in situ studies that could be performed in La Réunion and at the Maïdo Observatory. It also aims to develop scientific collaborations and to support future scientific projects in order to better understand the forest-gas-aerosol-cloud system in an insular tropical environment.
Fichier principal
Vignette du fichier
2019-Duflot_acp-19-10591-2019.pdf (13.93 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02269845 , version 1 (23-08-2019)

Licence

Paternité

Identifiants

Citer

Valentin Duflot, Pierre Tulet, Olivier Flores, Christelle Barthe, Aurélie Colomb, et al.. Preliminary results from the FARCE 2015 campaign: multidisciplinary study of the forest–gas–aerosol–cloud system on the tropical island of La Réunion. Atmospheric Chemistry and Physics, 2019, 19 (16), pp.10591-10618. ⟨10.5194/acp-19-10591-2019⟩. ⟨hal-02269845⟩
305 Consultations
50 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More