http://www.cnr.it/ontology/cnr/individuo/prodotto/ID275444

A study on the use of radar and lidar for characterizing ultragiant aerosol (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

A study on the use of radar and lidar for characterizing ultragiant aerosol (Articolo in rivista) (literal)

Anno

2013-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1002/jgrd.50789 (literal)

Alternative label

Madonna, F. , Amodeo, A., D'Amico, G., Pappalardo, G. (2013)
A study on the use of radar and lidar for characterizing ultragiant aerosol
in Journal of Geophysical Research: Atmospheres; AGU, American geophysical union, Washington, DC (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Madonna, F. , Amodeo, A., D'Amico, G., Pappalardo, G. (literal)

Pagina inizio

10056 (literal)

Pagina fine

10071 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50789/abstract;jsessionid=5540300D6280032195CD0DFA9AC85C99.f04t04 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

118 (literal)

Rivista

Journal of Geophysical Research: Atmospheres (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

16 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

17 (literal)

Note

ISI Web of Science (WOS) (literal)
Scopu (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Istituto di Metodologie per l'Analisi Ambientale, Consiglio Nazionale Delle Ricerche, Contrada S. Loja, Tito Scalo, Potenza I-85050, Italy (literal)

Titolo

A study on the use of radar and lidar for characterizing ultragiant aerosol (literal)

Abstract

[1] From 19 April to 19 May 2010, volcanic aerosol layers originating from the Eyjafjallajökull volcano were observed at the Institute of Methodologies for Environmental Analysis of the National Research Council of Italy Atmospheric Observatory, named CIAO (40.60°N, 15.72°E, 760 m above sea level), in Southern Italy with a multiwavelength Raman lidar. During this period, ultragiant aerosols were also observed at CIAO using a colocated 8.45 mm wavelength Doppler radar. The Ka-band radar signatures observed in four separate days (19 April and 7, 10, and 13 May) are consistent with the observation of nonspherical ultragiant aerosols characterized by values of linear depolarization ratio (LDR) higher than -4 dB. Air mass back trajectory analysis suggests a volcanic origin of the ultragiant aerosols observed by the radar. The observed values of the radar reflectivity (Ze) are consistent with a particle effective radius (r) larger than 50-75 µm. Scattering simulations based on the T-matrix approach show that the high LDR values can be explained if the observed particles have an absolute aspect ratio larger than 3.0 and consist of an internal aerosol core and external ice shell, with a variable radius ratio ranging between 0.2 and 0.7 depending on the shape and aspect ratio. Comparisons between daytime vertical profiles of aerosol backscatter coefficient (?) as measured by lidar and radar LDR reveal a decrease of ? where ultragiant particles are observed. Scattering simulations based on Mie theory show how the lidar capability in typing ultragiant aerosols could be limited by low number concentrations or by the presence of an external ice shell covering the aerosol particles. Preferential vertical alignment of the particles is discussed as another possible reason for the decrease of ?. (literal)

Editore