Characterization of Iceland volcanic aerosols by UV-polarization lidar at Lyon, SW Europe

Alain Miffre; Grégory David; Benjamin Thomas; Patrick Rairoux

doi:10.1117/12.869019

26 October 2010 Characterization of Iceland volcanic aerosols by UV-polarization lidar at Lyon, SW Europe

Alain Miffre, Grégory David, Benjamin Thomas, Patrick Rairoux

Proceedings Volume 7832, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing VI; 78320Q (2010) https://doi.org/10.1117/12.869019
Event: SPIE Remote Sensing, 2010, Toulouse, France

Abstract

In this paper, a ground-based UV-polarization Lidar is used to characterize the optical properties of volcanic particles that originated from the Eyjafjöll volcano (63.63°N, 19.62°W, Iceland) and advected over Lyon (45.76°N, 4.83°E, France), a distance 2,600 kilometers away. The volcanic origin of the observed particles has been confirmed with 7-days air mass back-trajectories and FLEXPART dispersion model. The measured UV-particle backscattering coefficient is typically equal to 4 × 10^-6 m^-1.sr^-1. UV-depolarization ratios measurements have been performed in the troposphere of Lyon to measure the degree of volcanic particle non-sphericity. Experimental efforts have been done to determine the systematic errors contributing to the retrieved UV-particle depolarization ratio δ_p. The precision on retrieved δ_p-values is hence dominated by the uncertainty on the extinction to backscatter ratio S = 55 ± 10. It follows that the microphysical properties of the observed volcanic aerosols are quite difficult to retrieve from δ_p. However, a main volcanic layer of 2 kilometres width has been observed in the troposphere of Lyon, where measured UV δ_p-values reach up to (30 ± 10) %, showing that the observed highly dispersed and aged volcanic particles are irregular-shaped particles, even at more than 2,000 km from the Eyjafjöll volcano.

Citation Download Citation

Alain Miffre, Grégory David, Benjamin Thomas, and Patrick Rairoux "Characterization of Iceland volcanic aerosols by UV-polarization lidar at Lyon, SW Europe", Proc. SPIE 7832, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing VI, 78320Q (26 October 2010); https://doi.org/10.1117/12.869019

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