References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-12-3115-2012

Monitoring of the Eyjafjallajökull volcanic aerosol plume over the Iberian Peninsula by means of four EARLINET lidar stations

Sicard

¹ ² Guerrero-Rascado

J. L.

³ ⁴ ⁷ Navas-Guzmán

³ ⁴ Preißler

⁵ Molero

⁶ Tomás

¹ ² Bravo-Aranda

J. A.

³ ⁴ Comerón

¹ Rocadenbosch

¹ ² Wagner

⁵ Pujadas

⁶ Alados-Arboledas

³ ⁴

Dept. of Signal Theory and Communications, Remote Sensing Lab., Universitat Politècnica de Catalunya, Barcelona, Spain

Institut d'Estudis Espacials de Catalunya – Aeronautics and Space Research Center (IEEC-CRAE), Universitat Politècnica de Catalunya, Barcelona, Spain

Andalusian Centre for Environmental Research, Junta de Andalucía, University of Granada, Granada, Spain

Applied Physics Department, University of Granada, Granada, Spain

Centro de Geofísica de Évora, Évora, Portugal

Centro de Investigaciones Energéticas Medioambientales y Tecnológicas, Madrid, Spain

now at: Centro de Geofísica de Évora, Évora, Portugal

30 03 2012

12 6 3115 3130

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Lidar and sun-photometer measurements were performed intensively over the Iberian Peninsula (IP) during the eruption of the Eyjafjallajökull volcano (Iceland) in April–May 2010. The volcanic plume reached all the IP stations for the first time on 5 May 2010. A thorough study of the event was conducted for the period 5–8 May. Firstly, the spatial and temporal evolution of the plume was described by means of lidar and sun-photometer measurements supported with backtrajectories. The volcanic aerosol layers observed over the IP were rather thin (<1000 m) with a top height up to 11–12 km. However, in some cases at the beginning of the period the thickness of those layers reached several kilometers in Évora and Madrid. The optical thicknesses associated to those layers were rather low (between 0.013 and 0.020 in average over the whole period), with peak values near 0.10 detected on 7 May. Secondly, the volcanic aerosols were characterized in terms of extinction and backscatter coefficients, lidar ratios, Ångström exponents and linear particle depolarization ratio. Lidar ratios at different sites varied between 30 and 50 sr without a marked spectral dependency. Similar extinction-related Ångström exponents varying between 0.6 and 0.8 were observed at different sites. The temporal evolution of the backscatter-related Ångström exponents points out a possible decrease of the volcanic particle size as the plume moved from west to east. Particle depolarization ratios on the order of 0.06–0.08 confirmed the coexistence of both ash and non-ash particles. Additionally, profiles of mass concentration were obtained with a method using the opposite depolarizing effects of ash particles (strongly depolarizing), non-ash particles (very weakly depolarizing), and sun-photometer observations. In Granada the ash mass concentration was found to be approximately 1.5 times higher than that of non-ash particles, and probably did not exceed the value of 200 μg m<sup>−3</sup> during the whole event.

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