81. Vertical profiling of aerosol properties with two-wavelength polarization Raman lidar over the Vipava valleyLonglong Wang, Samo Stamoč, Asta Gregorič, Griša Močnik, Luka Drinovec, Klemen Bergant, William Eichinger, 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.
Keywords: Aerosol, Vipava valley, lidar
Published in RUNG: 23.04.2018; Views: 4512; Downloads: 0
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82. Influence of clouds on black carbon direct radiative effect and heating rate over MilanAsta Gregorič, Luca Ferrero, Griša Močnik, S. Cogliati, F. Barnaba, L. Di Liberto, G. P. Gobbi, E. Bolzacchini, 2017, published scientific conference contribution abstract Keywords: black carbon, direct radiative effect, heating rate, clouds
Published in RUNG: 10.10.2017; Views: 4716; Downloads: 251
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83. Distinguishing source specific black carbon production from meteorologically driven temporal variability by means of 222Rn tracerAsta Gregorič, Luka Drinovec, Irena Ježek, Janja Vaupotič, Longlong Wang, Maruška Mole, Samo Stanič, Griša Močnik, 2017, published scientific conference contribution abstract Keywords: black carbon, source apportionment, radon, planetary boundary layer, lidar
Published in RUNG: 10.10.2017; Views: 5546; Downloads: 229
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84. Long-term investigation of aerosol variability in the boundary layer over Vipava valley based on lidar observations and black carbon measurementsLonglong Wang, Klemen Bergant, Marija Bervida, Luka Drinovec, William Eichinger, Asta Gregorič, Dafina Kikaj, Griša Močnik, Maruška Mole, Janja Vaupotič, Samo Stanič, 2017, published scientific conference contribution abstract Published in RUNG: 21.07.2017; Views: 5170; Downloads: 0
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86. The filter loading effect by ambient aerosols in filter absorption photometers depends on the mixing state of the sampled particlesLuka Drinovec, Asta Gregorič, Peter Zotter, Robert Wolf, Emily Anne Bruns, Andre S.H. Prevot, Jean-Eudes Petit, Olivier Favez, JEAN SCIARE, Ian J. Arnold, Rajan K. Chakrabarty, Hans Moosmüller, Agnes Fülöp-Miller, Griša Močnik, 2016, original scientific article Keywords: black carbon, mixing state, Aethalometer, filter-loading effect
Published in RUNG: 02.11.2016; Views: 5712; Downloads: 281
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87. Diurnal cycling of urban aerosols under different weather regimesAsta Gregorič, Luka Drinovec, Griša Močnik, Maja Remškar, Janja Vaupotič, Samo Stanič, 2016, published scientific conference contribution abstract Keywords: kakovost zraka, črn ogljik, aerosoli
Published in RUNG: 03.05.2016; Views: 5450; Downloads: 234
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88. Študij atmosferskih procesov v Vipavski dolini na podlagi razširjanja aerosolovMaruška Mole, Longlong Wang, Asta Gregorič, Klemen Bergant, Luka Drinovec, Griša Močnik, Samo Stanič, Janja Vaupotič, Marko Vučković, 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.
Keywords: aerosoli, atmosferski procesi, daljinsko zaznavanje, Vipavska dolina
Published in RUNG: 25.01.2016; Views: 6912; Downloads: 9
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89. Občutljivost modela za določanje virov aerosoliziranega črnega ogljika na izbrane vhodne parametreTine 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.
Keywords: črni ogljik, aethalometrski model, občutljivost, DECOMBIO
Published in RUNG: 20.01.2016; Views: 6651; Downloads: 279
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