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Balloon-borne measurement of the aerosol size distribution from an Icelandic flood basalt eruption

D. Vignelles ; T. J. Roberts ; E. Carboni ; E. Ilyinskaya ; M. Pfeffer ; P. D. Waldhauserova ; A. Schmidt ; G. Berthet ; F. Jegou ; J. B. Renard ; H. Olafsson ; B. Bergsson ; R. Yeo ; N. F. Reynisson ; R. G. Grainger ; Bo Galle (Institutionen för rymd- och geovetenskap, Optisk fjärranalys) ; Vladimir Conde (Institutionen för rymd- och geovetenskap, Optisk fjärranalys) ; Santiago Arellano (Institutionen för rymd- och geovetenskap, Optisk fjärranalys) ; T. Lurton ; B. Coute ; V. Duverger
Earth and Planetary Science Letters (0012-821X). Vol. 453 (2016), p. 252-259.
[Artikel, refereegranskad vetenskaplig]

We present in situ balloon-borne measurements of aerosols in a volcanic plume made during the Holuhraun eruption (Iceland) in January 2015. The balloon flight intercepted a young plume at 8 km distance downwind from the crater, where the plume is 15 min of age. The balloon carried a novel miniature optical particle counter LOAC (Light Optical Aerosol Counter) which measures particle number concentration and size distribution in the plume, alongside a meteorological payload. We discuss the possibility of calculating particle flux by combining LOAC data with measurements of sulfur dioxide flux by ground-based UV spectrometer (DOAS). The balloon passed through the plume at altitude range of 2.0-3.1 km above sea level (a.s.l.). The plume top height was determined as 2.7-3.1 km a.s.l., which is in good agreement with data from Infrared Atmospheric Sounding Interferometer (IASI) satellite. Two distinct plume layers were detected, a non condensed lower layer (300 m thickness) and a condensed upper layer (800 m thickness). The lower layer was characterized by a lognormal size distribution of fine particles (0.2 mu m diameter) and a secondary, coarser mode (2.3 mu m diameter), with a total particle number concentration of around 100 cm(-3) in the 0.2-100 mu m detection range. The upper layer was dominated by particle centered on 20 mu m in diameter as well as containing a finer mode (2 mu m diameter). The total particle number concentration in the upper plume layer was an order of magnitude higher than in the lower layer. We demonstrate that intercepting a volcanic plume with a meteorological balloon carrying LOAC is an efficient method to characterize volcanic aerosol properties. During future volcanic eruptions, balloon borne measurements could be carried out easily and rapidly over a large spatial area in order to better characterize the evolution of the particle size distribution and particle number concentrations in a volcanic plume.

Nyckelord: volcano plume; balloon; in-situ measurement; aerosol counter; Iceland

Denna post skapades 2016-10-19. Senast ändrad 2017-01-20.
CPL Pubid: 243683


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Optisk fjärranalys (2010-2017)


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