| Title: | Vertical profiling of aerosol properties with two-wavelength polarization Raman lidar over the Vipava valley |
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| Authors: | ID Wang, Longlong, University of Nova Gorica, Ajdovščina, Slovenia (Author)
ID Stamoč, Samo, University of Nova Gorica, Ajdovščina, Slovenia (Author)
ID Gregorič, Asta (Author)
ID Močnik, Griša (Author)
ID Drinovec, Luka (Author)
ID Bergant, Klemen (Author)
ID Eichinger, William (Author), et al. |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.12 - Published Scientific Conference Contribution Abstract |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | Presence of atmospheric aerosols affects the Earth’s radiation budget and thus also atmospheric thermal structure,
which in turn affects cloud and planetary boundary layer (PBL) dynamics. We combine in-situ and remote
measurements to determine aerosol properties in a representative hot-spot for air pollution in a complex terrain
configuration. Vertical profiles of aerosol properties were investigated using a two-wavelength polarization
Raman lidar system in the Vipava valley. Using lidar-obtained particle depolarization ratio, lidar ratio and
backscatter Ångström exponent (355 nm / 1064 nm), which depend on aerosol shape, size and refractive index,
thus the aerosols can be identified and the roles of different aerosol types in the observed atmospheric processes
were investigated. In addition, aerosol absorption coefficients were measured in-situ by Aethalometers (AE33,
Magee Scientific / Aerosol d.o.o.) on the valley floor and on the adjacent mountain range, 850 m above the lidar site.
Our primary goal was to study the variability of aerosol types within and above the Vipava valley, which
was performed using the entire lidar dataset from August – December 2017. Primary anthropogenic aerosols
within the valley is mainly emitted from two sources: individual domestic heating systems, which mostly use
biomass fuel and traffic. Natural aerosols, transported by long-range transport, such as mineral dust and sea salt,
were observed both above the PBL and entering into the PBL. Vertical distributions of aerosol properties, in par-
ticular the particle depolarization ratio, indicated atmospheric stratification with different aerosol types occupying
different height ranges. In the presence of Bora (strong down-slope wind), Kelvin-Helmholtz instabilities were
observed between the PBL and the free troposphere. Using aerosol type identification capability of our system,
we discovered that this instability was responsible for ejecting aerosols from the PBL up to 2 km into the free
troposphere.
In addition, we improved the reliability of aerosol identification in vertical profiles using absorption coeffi-
cient measured by Aethalometer. Combining it with the aerosol extinction coefficient at 355 nm derived from
lidar data, we derived aerosol single scattering albedo (SSA), which is an important parameter for aerosol
characterization. |
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| Keywords: | Aerosol, Vipava valley, lidar |
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| Publication status: | Published |
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| Year of publishing: | 2018 |
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| PID: | 20.500.12556/RUNG-3916-87c1ce9c-88f3-202a-e49b-f5a55b4f976d |
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| COBISS.SI-ID: | 5146619 |
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| NUK URN: | URN:SI:UNG:REP:9GW0ER69 |
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| Publication date in RUNG: | 23.04.2018 |
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| Views: | 5170 |
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| Downloads: | 0 |
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