First results of the Piton de la Fournaise STRAP 2015 experiment : multidisciplinary tracking of a volcanic gas and aerosol plume

Pierre Tulet; Andrea Di Muro; Aurélie Colomb; Cyrielle Denjean; Valentin Duflot; Santiago Arellano; Brice Foucart; Jérôme Brioude; Karine Sellegri; Aline Peltier; Alessandro Aiuppa; Christelle Barthe; Chatrapatty Bhugwant; Soline Bielli; Patrice Boissier; Guillaume Boudoire; Thierry Bourrianne; Christophe Brunet; Fréderic Burnet; Jean-Pierre Cammas; Franck Gabarrot; Bo Galle; Gaetano Giudice; Christian Guadagno; Fréderic Jeamblu; Philippe Kowalski; Jimmy Leclair de Bellevue; Nicolas Marquestaut; Dominique Mékies; Jean Metzger; Joris Pianezze; Thierry Portafaix; Jean Sciare; Arnaud Tournigand; Nicolas Villeneuve

First results of the Piton de la Fournaise STRAP 2015 experiment : multidisciplinary tracking of a volcanic gas and aerosol plume

Pierre Tulet ¹ Andrea Di Muro ² Aurélie Colomb ³ Cyrielle Denjean ⁴ Valentin Duflot ¹ Santiago Arellano ⁵ Brice Foucart ^{1, 3} Jérôme Brioude ¹ Karine Sellegri ³ Aline Peltier ² Alessandro Aiuppa ^{6, 7} Christelle Barthe ¹ Chatrapatty Bhugwant ⁸ Soline Bielli ¹ Patrice Boissier ² Guillaume Boudoire ² Thierry Bourrianne ⁴ Christophe Brunet ² Fréderic Burnet ⁴ Jean-Pierre Cammas ^{1, 9} Franck Gabarrot ⁹ Bo Galle ⁵ Gaetano Giudice ⁶ Christian Guadagno ⁸ Fréderic Jeamblu ¹ Philippe Kowalski ² Jimmy Leclair de Bellevue ¹ Nicolas Marquestaut ⁹ Dominique Mékies ¹ Jean Metzger ⁹ Joris Pianezze ¹ Thierry Portafaix ¹ Jean Sciare ¹⁰ Arnaud Tournigand ⁸ Nicolas Villeneuve ^{2, 11}

1 LACy - Laboratoire de l'Atmosphère et des Cyclones

2 OVPF - Observatoire Volcanologique du Piton de la Fournaise

3 LaMP - Laboratoire de Météorologie Physique - Clermont Auvergne

4 CNRM - Centre national de recherches météorologiques

5 Chalmers University of Technology [Göteborg]

6 INGV - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Palermo

7 Dipartimento DiSTeM

8 ORA - Observatoire réunionnais de l'Air

9 OSU-Réunion - Observatoire des Sciences de l'Univers de La Réunion

10 CyI - Cyprus Institute

11 LGSR - Laboratoire GéoSciences Réunion

Abstract : The STRAP (Synergie Transdisciplinaire pour Répondre aux Aléas liés aux Panaches volcaniques) campaign was conducted over the entire year of 2015 to investigate the volcanic plumes of Piton de La Fournaise (La Réu-nion, France). For the first time, measurements at the local (near the vent) and at the regional scales were conducted around the island. The STRAP 2015 campaign has become possible thanks to strong cross-disciplinary collaboration between volcanologists and meteorologists. The main observations during four eruptive periods (85 days) are summarised. They include the estimates of SO 2 , CO 2 and H 2 O emissions, the altitude of the plume at the vent and over different areas of La Réunion Island, the evolution of the SO 2 concentration , the aerosol size distribution and the aerosol extinction profile. A climatology of the volcanic plume dispersion is also reported. Simulations and measurements show that the plumes formed by weak eruptions have a stronger interaction with the surface of the island. Strong SO 2 mixing ratio and particle concentrations above 1000 ppb and 50 000 cm −3 respectively are frequently measured over a distance of 20 km from Piton de la Fournaise. The measured aerosol size distribution shows the predominance of small particles in the volcanic plume. Several cases of strong nucleation of sulfuric acid have been observed within the plume and at the distal site of the Maïdo observatory. The STRAP 2015 campaign provides a unique set of multidisciplinary data that can now be used by modellers to improve the numerical parameterisa-tions of the physical and chemical evolution of the volcanic plumes.

Keywords : aerosol plume volcanic gas Reunion Island volcano

Document type :

Journal articles

Domain :

Sciences of the Universe [physics] / Earth Sciences / Volcanology

Physics [physics] / Physics [physics] / Atmospheric and Oceanic Physics [physics.ao-ph]

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First results of the Piton de la Fournaise STRAP 2015 experiment : multidisciplinary tracking of a volcanic gas and aerosol plume

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First results of the Piton de la Fournaise STRAP 2015 experiment : multidisciplinary tracking of a volcanic gas and aerosol plume

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