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1.
Občutljivost modela za določanje virov aerosoliziranega črnega ogljika na izbrane vhodne parametre
Tine Bizjak, 2016, undergraduate thesis

Abstract: Z obdelavo podatkov meritev v okviru projekta DECOMBIO v treh krajih (Chamonix, Passy, Marnaz) doline reke Arve v Franciji smo določili nihanje koncentracije črnega ogljika (ČO). Z uporabo aethalometrskega modela smo določili prispevke ČO, ki izvira iz uporabe fosilnih goriv (ČOf) in ČO, katerega vir je kurjenje biomase (ČOb). Naredili smo raziskavo občutljivosti aethalometrskega modela na izbrane kombinacije vhodnih parametrov α (Ångströmov absorpcijski eksponent) za fosilna goriva (αf) in biomaso (αb). S pomočjo podatkov meritev dnevne koncentracije levoglukozana smo za vse tri kraje določili najustreznejšo kombinacijo αf in αb. Za kraj Marnaz smo naredili raziskavo vpliva dnevnih temperatur zraka in količine padavin na nihanje koncentracije ČO. Ugotovili smo, da je nihanje koncentracije ČO, ČOb in ČOf opazno med dnevom, odvisno od letnega časa in se razlikuje med delavniki in nedeljami. V zimskem obdobju je povprečen prispevek ČOb okoli 40 %. V poletnem obdobju prevladuje ČOf. Aethalometrski model je bolj občutljiv na izbiro αb v zimskem času, poleti je zaradi manjšega prispevka ČOb bolj pomembna izbira primerne vrednosti αf. Najustreznejše vrednosti parametrov αf in αb se ujemajo z vrednostmi v drugih raziskavah in najpogosteje uporabljenimi vrednostmi αf = 1 in αb = 2. Padavine in temperatura zraka vplivata na nihanje koncentracije ČO, ČOf in ČOb.
Found in: osebi
Keywords: črni ogljik, aethalometrski model, občutljivost, DECOMBIO
Published: 20.01.2016; Views: 2546; Downloads: 148
.pdf Fulltext (4,23 MB)

2.
Študij atmosferskih procesov v Vipavski dolini na podlagi razširjanja aerosolov
Marko Vučković, Janja Vaupotič, Griša Močnik, Samo Stanič, Luka Drinovec, Klemen Bergant, Asta Gregorič, Longlong Wang, Maruška Mole, 2016, published scientific conference contribution

Abstract: Vipavska dolina je geomorfološko dokaj zaprta, kar po eni strani omogoča pojav močne burje, po drugi strani pa ob stabilnih meteoroloških razmererah ugodne pogoje za kopičenje aerosolov znotraj prizemne mejne plasti. Poznavanje dinamike višinske porazdelitve aerosolov s sočasno uporabo prizemnih meritev omogoča raziskave lokalnih emisij aerosolov, transporta aerosolov na daljše razdalje ter značilnih atmosferskih struktur, ki se pojavijo v različnih vremenskih pogojih. Pri meritvah smo uporabili metode daljinskega zaznavanja z lidarjem, ki omogočajo opazovanje časovnega in prostorskega spreminjanja koncentracij aerosolov, ter točkovne meritve, ki omogočajo njihovo prepoznavanje in določanje njihovih lastnosti. Ugotovili smo, da je mogoče lidarske meritve uporabiti za študij vrste atmosferskih procesov in struktur v zelo različnih vremenskih pogojih. Opazili smo manjše konvekcijske strukture znotraj prizemne mejne plasti in gravitacijske valove nad njo. Meritve vsebnosti in lastnosti aerosolov pri tleh kažejo, da se lahko ob stabilnih atmosferskih pogojih v primerih povečanja lokalnih emisij njihove koncentracije hitro povečajo. Dinamiko in strukturo razširjanja aerosolov znotraj Vipavske doline bomo v prihodnje podrobneje raziskali s sočasnim prostorskim pregledovanjem z metodami daljinskega zaznavanja.
Found in: osebi
Keywords: aerosoli, atmosferski procesi, daljinsko zaznavanje, Vipavska dolina
Published: 25.01.2016; Views: 2442; Downloads: 9
.pdf Fulltext (4,02 MB)

3.
Diurnal cycling of urban aerosols under different weather regimes
Janja Vaupotič, Maja Remškar, Griša Močnik, Luka Drinovec, Asta Gregorič, Samo Stanič, 2016, published scientific conference contribution abstract

Found in: osebi
Keywords: kakovost zraka, črn ogljik, aerosoli
Published: 03.05.2016; Views: 1766; Downloads: 128
.pdf Fulltext (33,73 KB)

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Influence of clouds on black carbon direct radiative effect and heating rate over Milan
Asta Gregorič, Luca Ferrero, Griša Močnik, S. Cogliati, F. Barnaba, L. Di Liberto, G. P. Gobbi, E. Bolzacchini, 2017, published scientific conference contribution abstract

Found in: osebi
Keywords: black carbon, direct radiative effect, heating rate, clouds
Published: 10.10.2017; Views: 1094; Downloads: 112
.pdf Fulltext (135,28 KB)

7.
Vertical profiling of aerosol properties with two-wavelength polarization Raman lidar over the Vipava valley
William Eichinger, Klemen Bergant, Griša Močnik, Luka Drinovec, Samo Stamoč, Asta Gregorič, Longlong Wang, 2018, published scientific conference contribution abstract

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.
Found in: osebi
Keywords: Aerosol, Vipava valley, lidar
Published: 23.04.2018; Views: 1008; Downloads: 0
.pdf Fulltext (35,82 KB)

8.
Investigation of Aerosol Properties and Structures in Two Representative Meteorological Situations over the Vipava Valley Using Polarization Raman LiDAR
Luka Drinovec, Griša Močnik, William Eichinger, Samo Stanič, Longlong Wang, Asta Gregorič, 2019, original scientific article

Abstract: Vipava valley in Slovenia is a representative hot-spot for complex mixtures of different aerosol types of both anthropogenic and natural origin. Aerosol loading distributions and optical properties were investigated using a two-wavelength polarization Raman LiDAR, which provided extinction coefficient, backscatter coefficient, depolarization ratio, backscatter Ångström exponent and LiDAR ratio profiles. Two different representative meteorological situations were investigated to explore the possibility of identifying aerosol types present in the valley. In the first case, we investigated the effect of strong downslope (Bora) wind on aerosol structures and characteristics. In addition to observing Kelvin–Helmholtz instability above the valley, at the height of the adjacent mountain ridge, we found new evidence for Bora-induced processes which inject soil dust aerosols into the free troposphere up to twice the height of the planetary boundary layer (PBL). In the second case, we investigated aerosol properties and distributions in stable weather conditions. From the observed stratified vertical aerosol structure and specific optical properties of different layers we identified predominant aerosol types in these layers.
Found in: osebi
Keywords: aerosol structures, aerosol characterization, polarization Raman LiDAR, Vipava valley
Published: 08.03.2019; Views: 485; Downloads: 23
.pdf Fulltext (3,11 MB)

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