http://www.cnr.it/ontology/cnr/individuo/prodotto/ID286439
Vertically resolved aerosol properties by multi-wavelength lidar measurements (Articolo in rivista)
- Type
- Label
- Vertically resolved aerosol properties by multi-wavelength lidar measurements (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.5194/acp-14-1185-2014 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Perrone M.R.; De Tomasi F.; Gobbi G.P. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
- http://www.scopus.com/inward/record.url?eid=2-s2.0-84893452346&partnerID=q2rCbXpz (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
- Note
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Department of Mathematics and Physics, Universita' Del Salento, 73100 Lecce, Italy; Institute of Atmospheric Sciences and Climate, CNR, Rome, Italy (literal)
- Titolo
- Vertically resolved aerosol properties by multi-wavelength lidar measurements (literal)
- Abstract
- An approach based on the graphical method of
Gobbi and co-authors (2007) is introduced to estimate the
dependence on altitude of the aerosol fine mode radius (Rf)
and of the fine mode contribution (?) to the aerosol optical
thickness (AOT) from three-wavelength lidar measurements.
The graphical method of Gobbi and co-authors (2007) was
applied to AERONET (AErosol RObotic NETwork) spectral
extinction observations and relies on the combined analysis
of the Ångstrom exponent (å) and its spectral curvature
1å. Lidar measurements at 355, 532 and 1064 nm were
used in this study to retrieve the vertical profiles of å and
1å and to estimate the dependence on altitude of Rf and
?(532 nm) from the å-1å combined analysis. Lidar measurements
were performed at the Department of Mathematics
and Physics of the Universita' del Salento, in south-eastern
Italy. Aerosol from continental Europe, the Atlantic, northern
Africa, and the Mediterranean Sea are often advected
over south-eastern Italy and as a consequence, mixed advection
patterns leading to aerosol properties varying with altitude
are dominant. The proposed approach was applied to ten
measurement days to demonstrate its feasibility in different
aerosol load conditions. The selected days were characterized
by AOTs spanning the 0.26-0.67, 0.15-0.39, and 0.04-
0.27 range at 355, 532, and 1064 nm, respectively. Mean
lidar ratios varied within the 31-83, 32-84, and 11-47 sr
range at 355, 532, and 1064 nm, respectively, for the high
variability of the aerosol optical and microphysical properties.
å values calculated from lidar extinction profiles at 355
and 1064 nm ranged between 0.1 and 2.5 with a mean value
±1 standard deviation equal to 1.3±0.7. 1å varied within
the -0.1-1 range with mean value equal to 0.25±0.43.
Rf and ?(532 nm) values spanning the 0.05-0.3 ?m and the
0.3-0.99 range, respectively, were associated with the å-1å
data points. Rf and ? values showed no dependence on the
altitude. 60% of the data points were in the 1å-å space delimited
by the ? and Rf curves varying within 0.80-0.99 and
0.05-0.15 ?m, respectively, for the dominance of fine-mode
particles in driving the AOT over south-eastern Italy. Vertical
profiles of the linear particle depolarization ratio retrieved
from lidar measurements, aerosol products from AERONET
sun photometer measurements collocated in space and time,
analytical back trajectories, satellite true colour images, and
dust concentrations from the BSC-DREAM (Barcelona Super
Computing Center-Dust REgional Atmospheric Model)
model were used to demonstrate the robustness of the proposed
method. (literal)
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