Balloon-borne measurement of the aerosol size distribution from an Icelandic flood basalt eruption
Artikel i vetenskaplig tidskrift, 2016

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.

aerosol counter

volcano plume

in-situ measurement

balloon

Iceland

Författare

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

Chalmers, Rymd- och geovetenskap, Optisk fjärranalys

Alexander Vladimir Conde Jacobo

Chalmers, Rymd- och geovetenskap, Optisk fjärranalys

Santiago Arellano

Chalmers, Rymd- och geovetenskap, Optisk fjärranalys

T. Lurton

B. Coute

V. Duverger

Earth and Planetary Science Letters

0012-821X (ISSN) 1385-013X (eISSN)

Vol. 453 252-259

Ämneskategorier

Geofysisk teknik

Geokemi

Drivkrafter

Hållbar utveckling