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22. Aeolian dispersal of bacteria in southwest Greenland: their sources, abundance, diversity and physiological statesTina Šantl Temkiv, Ulrich Gosewinkel, Piotr Starnawski, Mark Lever, Kai Finster, 2018, original scientific article Keywords: arctic microbial communities, aeolian dispersal, community assembly, 16S ribosomal RNA, microbial activity, atmospheric processes Published in RUNG: 04.01.2021; Views: 2519; Downloads: 0 This document has many files! More... |
23. The microbial diversity of a storm cloud as assessed by hailstonesTina Šantl Temkiv, Kai Finster, Bjarne Munk Hansen, Niels Woetmann Nilesen, Ulrich Gosewinkel Karlson, 2012, original scientific article Keywords: cloud-borne bacteria, bacterial diversity, species richness, species evenness, atmospheric chemistry, biogeography Published in RUNG: 04.01.2021; Views: 2503; Downloads: 0 This document has many files! More... |
24. Hailstones: A Window into the Microbial and Chemical Inventory of a Storm CloudTina Šantl Temkiv, Kai Finster, Thorsten Dittman, Bjarne Munk Hansen, Runar Thyrhaug, Niels Woetmann Nielsen, Ulrich Gosewinkel, 2013, original scientific article Keywords: atmospheric bacteria, atmospheric DOM, cloud microbiota, microbial activity Published in RUNG: 04.01.2021; Views: 2599; Downloads: 64 Full text (402,78 KB) |
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26. Real-time Measurements with Atmospheric Instruments at the Pierre Auger ObservatoryViolet M. Harvey, Andrej Filipčič, Gašper Kukec Mezek, Marta Trini, Samo Stanič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2019, published scientific conference contribution Keywords: ultra-high energy cosmic rays, Pierre Auger Observatory, atmospheric monitoring, instrumentation Published in RUNG: 24.07.2020; Views: 2565; Downloads: 114 Full text (843,94 KB) |
27. Polarization Raman Lidar for Atmospheric Monitoring in the Vipava ValleyLonglong Wang, Samo Stanič, William Eichinger, Xiaoquan Song, Marko Zavrtanik, 2020, published scientific conference contribution Abstract: We report on the design, construction and performance of a polarization Raman lidar, built for atmospheric monitoring in the Vipava valley in SW Slovenia, a regional air pollution hot-spot where aerosols are expected to originate from a number of different sources. Its key features are automatized remote operation capability and indoor deployment, which provide high duty cycle in all weather conditions. System optimization and performance studies include the calibration of the depolarization ratio, merging of near-range (analog) and far-range (photon-counting) data, determination of overlap functions and validation of the retrieved observables with radiosonde data. Keywords: polarization Ramal lidar, Vipava valley, atmospheric monitoring Published in RUNG: 08.07.2020; Views: 3028; Downloads: 0 This document has many files! More... |
28. Bora wind effects on common structures in the Vipava valleyMarija Bervida, 2020, doctoral dissertation Abstract: Strong and gusty north-east wind called Bora is common in south-west regions of Slovenia, as well as along the Adriatic coast. Its intermittent behavior, related to variable strength, frequency and duration, has brought out scientific curiosity for decades. Bora affects human life and causes problems for structures built in Bora affected areas. In Slovenia, Bora is the strongest in the Vipava valley. The motivation for this research is the need to evaluate Bora wind effects on structures, commonly found in the Vipava valley region, using a high resolution computational fluid dynamics (CFD) modeling approach. To date, there are several experimental and computational constraints for accurate representation of Bora in a CFD model, therefore, the main aim of this dissertation is to build foundations for Bora wind simulations using CFD and its method of finite
volumes. The dissertation incorporates the analysis of experimental measurements of Bora wind, as well as numerical modeling studies.
Vertical mean wind speed profile characteristics of Bora were analyzed based on experimental measurements at Razdrto just above the Vipava valley. The obtained results contributed to the choice of Bora mean wind profiles applied at the inflow of computational models. Guidelines regarding the choice of the associated wind profile parameters were given and a new relationship between these parameters was found. As orographic barriers to the north of the Vipava valley
are known to give rise to Bora and to define the specific properties of the Bora flow, numerical modeling studies were in the first place focused on the implementation of the real-scale complex terrain into a CFD model. Simulation of wind flow over orographic barrier in Vipava valley was performed using Raynolds averaged Navier-Stokes approach, providing a first estimation of the flow field over a small hill of
Zemono.
As resolving the turbulence characteristics of Bora is very important for the estimation of wind loads on structures, modeling studies converged towards a more appropriate approach - Large eddy simulations (LES). A crucial step in setting up an accurate LES is the generation of appropriate inflow, which was investigated for the case of atmospheric boundary layer (ABL) flow. The synthetic method PRFG^3 for the generation of unsteady inflow was tested and adapted as a source of an ABL flow with desired turbulence flow properties. Based on its performance, in particular on adequate reproduction of target turbulence intensities and length scales, it was found that PRFG^3 method may be used to generate velocity inflow with desired turbulence properties in LES. Finally, simulations of wind flow coming from Bora direction over the Vipava valley were performed with the aim to depict the effects of underlying orography on the flow within and above the valley. Modeling results were found to be comparable with the results of lidar based remote sensing of vertical atmospheric structures within and above the valley. Keywords: Vipava valley, Bora wind, Wind profile, Orography, Atmospheric boundary layer, Computational fluid dynamics, Numerical simulations Published in RUNG: 17.06.2020; Views: 5370; Downloads: 47 Full text (35,12 MB) |
29. Study of Ultra-High Energy Cosmic Ray composition using Telescope Array’s Middle Drum detector and surface array in hybrid modeR.U. Abbasi, Jon Paul Lundquist, 2015, original scientific article Abstract: Previous measurements of the composition of Ultra-High Energy Cosmic Rays (UHECRs) made by the High Resolution Fly’s Eye (HiRes) and Pierre Auger Observatory (PAO) are seemingly contradictory, but utilize different detection methods, as HiRes was a stereo detector and PAO is a hybrid detector. The five year Telescope Array (TA) Middle Drum hybrid composition measurement is similar in some, but not all, respects in methodology to PAO, and good agreement is evident between data and a light, largely protonic, composition when comparing the measurements to predictions obtained with the QGSJetII-03 and QGSJet-01c models. These models are also in agreement with previous HiRes stereo measurements, confirming the equivalence of the stereo and hybrid methods. The data is incompatible with a pure iron composition, for all models examined, over the available range of energies. The elongation rate and mean values of are in good agreement with Pierre Auger Observatory data. This analysis is presented using two methods: data cuts using simple geometrical variables and a new pattern recognition technique. Keywords: Ultra-High Energy Cosmic Rays, Cosmic ray composition, Atmospheric fluorescence, Extensive air shower array, Hybrid, Telescope Array Published in RUNG: 24.04.2020; Views: 3026; Downloads: 0 This document has many files! More... |
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