Results of a lidar measurement campaign performed at IMAA-CNR (Potenza, Italy) during the 2002 Etna volcano eruption, are reported. With combined Raman elastic-backscatter lidar, independent measurements of aerosol extinction and backscatter coefficients at 355 nm are retrieved, whereas aerosol backscatter coefficient at 532 nm is retrieved from elastic lidar signal. A volcanic aerosol layer has been observed in the free troposphere on 1-2 November. AVHRR images show direct plume transport from Etna to Potenza. Optical depth of 0.1 and lidar ratio of 55 sr at 355 nm have been observed at the moment of direct transport. For the first time, a measurement of the lidar ratio for tropospheric volcanic aerosol has been performed. This lidar ratio value and the estimation of the wavelength dependence of the aerosol backscatter coefficient of 2.4 indicate the presence of young sub-micron sulfate particles, a low soot content, and the absence of large ash particles.

Raman lidar observations of aerosol emitted during the 2002 Etna eruption

CUOMO, Vincenzo
2004

Abstract

Results of a lidar measurement campaign performed at IMAA-CNR (Potenza, Italy) during the 2002 Etna volcano eruption, are reported. With combined Raman elastic-backscatter lidar, independent measurements of aerosol extinction and backscatter coefficients at 355 nm are retrieved, whereas aerosol backscatter coefficient at 532 nm is retrieved from elastic lidar signal. A volcanic aerosol layer has been observed in the free troposphere on 1-2 November. AVHRR images show direct plume transport from Etna to Potenza. Optical depth of 0.1 and lidar ratio of 55 sr at 355 nm have been observed at the moment of direct transport. For the first time, a measurement of the lidar ratio for tropospheric volcanic aerosol has been performed. This lidar ratio value and the estimation of the wavelength dependence of the aerosol backscatter coefficient of 2.4 indicate the presence of young sub-micron sulfate particles, a low soot content, and the absence of large ash particles.
File in questo prodotto:
File Dimensione Formato  
2004GRL_Pappalardo_Raman lidar observations of aerosol emitted during the 2002 Etna.pdf

non disponibili

Tipologia: Documento in Post-print
Licenza: DRM non definito
Dimensione 166.78 kB
Formato Adobe PDF
166.78 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/1306
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact