Thematische Bibliographien / Snow particles

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Auswahl der wissenschaftlichen Literatur zum Thema „Snow particles“

Autor: Grafiati

Veröffentlicht am 29. Juni 2021

Zuletzt aktualisiert am 29. Juli 2025

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Zeitschriftenartikel zum Thema "Snow particles"

Rastello, Marie, Fabrice Rastello, Hervé Bellot, Frédéric Ousset, François Dufour, and Lorenz Meier. "Size of snow particles in a powder-snow avalanche." Journal of Glaciology 57, no. 201 (2011): 151–56. http://dx.doi.org/10.3189/002214311795306637.

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AbstractLittle quantitative information is available concerning the size of ice particles in the turbulent clouds of powder-snow avalanches. To quantify particle size distributions, we have developed an experimental device that collects particles in real-scale powder avalanches. The device was placed on the concrete bunker of the Swiss Vallée de la Sionne avalanche dynamics test site. On 31 January 2003, a large powder-snow avalanche struck the bunker and we were able to collect particle samples. The collected particles have been photographed and the pictures digitized. An image analysis tool

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Huang, N., and Z. Wang. "A 3-D simulation of drifting snow in the turbulent boundary layer." Cryosphere Discussions 9, no. 1 (2015): 301–31. http://dx.doi.org/10.5194/tcd-9-301-2015.

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Abstract. The drifting snow is one of the most important factors that affect the global ice mass balance and hydrological balance. Current models of drifting snow are usually one- or two-dimensional, focusing on the macroscopic quantities of drifting snow under temporal average flow. In this paper, we take the coupling effects between wind and snow particles into account and present a 3-D model of drifting snow with mixed grain size in the turbulent boundary layer. The Large Eddy Simulation (LES) method is used for simulating the turbulent boundary layer of the wind field and the 3-D trajector

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Yin, Mengtao, and Cheng Yuan. "Exploring the Environmental Conditions of Snow Particles Using Spaceborne Triple-Frequency Radar Measurements over Ocean." Remote Sensing 14, no. 21 (2022): 5512. http://dx.doi.org/10.3390/rs14215512.

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The environmental conditions of snow particles with different particle sizes and bulk effective densities over the ocean are explored using a coincidence dataset of National Aeronautics and Space Administration (NASA) CloudSat Cloud Profiling Radar (CPR) and Global Precipitation Mission (GPM) Dual-frequency Precipitation Radar (DPR). Observed triple-frequency radar signatures for snow particles over the ocean are firstly derived. Based on modeled triple-frequency signatures for various snow particles, DFR Ku/Ka and the ratio of DFR Ku/Ka to DFR Ku/W from observations are selected to indicate t

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Yuter, Sandra E., David E. Kingsmill, Louisa B. Nance, and Martin Löffler-Mang. "Observations of Precipitation Size and Fall Speed Characteristics within Coexisting Rain and Wet Snow." Journal of Applied Meteorology and Climatology 45, no. 10 (2006): 1450–64. http://dx.doi.org/10.1175/jam2406.1.

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Abstract Ground-based measurements of particle size and fall speed distributions using a Particle Size and Velocity (PARSIVEL) disdrometer are compared among samples obtained in mixed precipitation (rain and wet snow) and rain in the Oregon Cascade Mountains and in dry snow in the Rocky Mountains of Colorado. Coexisting rain and snow particles are distinguished using a classification method based on their size and fall speed properties. The bimodal distribution of the particles’ joint fall speed–size characteristics at air temperatures from 0.5° to 0°C suggests that wet-snow particles quickly

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Shevchenko, Vladimir P., Sergey N. Vorobyev, Ivan V. Krickov, et al. "Insoluble Particles in the Snowpack of the Ob River Basin (Western Siberia) a 2800 km Submeridional Profile." Atmosphere 11, no. 11 (2020): 1184. http://dx.doi.org/10.3390/atmos11111184.

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Snowpack exhibits properties that make it a unique natural archive of airborne pollution. The data on insoluble particles in the Ob River catchment (Western Siberia) snowpack are limited. Insoluble particles in the snowpack of Western Siberia were studied at 36 sites on a 2800 km submeridional profile from the city of Barnaul to Salekhard in February 2020. Snow samples were collected over the full depth of the snow core, from the surface of the snow cover to the boundary with soil, except for the lower 1–2 cm. After the filtration of melted snow through a 0.45-µm membrane, the particle composi

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ITO, YOICHI, FLORENCE NAAIM-BOUVET, KOUICHI NISHIMURA, et al. "Measurement of snow particle size and velocity in avalanche powder clouds." Journal of Glaciology 63, no. 238 (2017): 249–57. http://dx.doi.org/10.1017/jog.2016.130.

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ABSTRACTParticle size, particle speed and airflow speed have been measured in the powder snow clouds of avalanches to investigate the suspension and transportation processes of snow particles. The avalanches were artificially triggered at the Lautaret full-scale avalanche test-site (French Alps) where an ultrasonic anemometer and a snow particle counter were setup in an avalanche track for measurements. Relatively large particles were observed during passage of the avalanche head and then the size of the particles slightly decreased as the core of the avalanche passed the measurement station.

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Heintzenberg, Jost, and Markku Rummukainen. "Airborne particles in snow." Journal of Glaciology 39, no. 132 (1993): 239–44. http://dx.doi.org/10.1017/s0022143000015896.

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Abstract In a pilot experiment, airborne particles were shown to exist in snow. In newly deposited snow they could be traced down to 17 cm below the surface. With our particle sensor, the snow was ventilated on the level of expected natural ventilation velocities. We show with a simple deposition model that air/snow exchange of airborne particles must be considered in the interpretation of impurities in snow and glacier ice. However, the relative magnitude of ventilation velocity compared to dry-deposition velocities at the surface is of crucial importance for determining total deposition. In

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Heintzenberg, Jost, and Markku Rummukainen. "Airborne particles in snow." Journal of Glaciology 39, no. 132 (1993): 239–44. http://dx.doi.org/10.3189/s0022143000015896.

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AbstractIn a pilot experiment, airborne particles were shown to exist in snow. In newly deposited snow they could be traced down to 17 cm below the surface. With our particle sensor, the snow was ventilated on the level of expected natural ventilation velocities. We show with a simple deposition model that air/snow exchange of airborne particles must be considered in the interpretation of impurities in snow and glacier ice. However, the relative magnitude of ventilation velocity compared to dry-deposition velocities at the surface is of crucial importance for determining total deposition. In p

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SAITOH, K., K. SERA, and K. HIRANO. "CHARACTERIZATION OF TOTAL SUSPENDED PARTICULATE (TSP) IN A MOUNTAINOUS REGION IN NORTHERN JAPAN." International Journal of PIXE 11, no. 01n02 (2001): 11–19. http://dx.doi.org/10.1142/s0129083501000037.

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Total suspended particulate (TSP) samples were collected at the west-facing slope (altitude 700 m) of Mt. Moriyoshi in northern Japan, from 24 – 27 June (non-snow-clad period) and 11 – 14 December (snow-clad period) in 1996, with a one-hour sampling interval. The elemental composition and particle shape of TSP samples were determined and/or observed by Particle Induced X-ray Emission (PIXE), a Scanning Electron Microscope (SEM) combined with Energy Dispersive X-ray (EDX) analysis. In the hourly TSP samples collected during the non-snow-clad period, 27 elements were determined. Na, Mg, Al, Si,

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Omiya, Satoshi, Atsushi Sato, Kenji Kosugi, and Shigeto Mochizuki. "Estimation of the electrostatic charge of individual blowing-snow particles by wind tunnel experiment." Annals of Glaciology 52, no. 58 (2011): 148–52. http://dx.doi.org/10.3189/172756411797252167.

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AbstarctThere are some reports on the measurement of the charge-to-mass ratio of blowing-snow particles, but there are few studies concerned with individual snow-particle charge. We measured the charge-to-mass ratios using snow particles selected according to size, and discussed individual charges. Experiments were conducted in a cryogenic wind tunnel. Charge-to-mass ratios measured in our experiment were all negative and their absolute values tended to increase with a decrease in particle diameter. Individual snow-particle charges were calculated from the average of particle diameter distribu

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Dissertationen zum Thema "Snow particles"

Axebrink, Emma. "Automatic Classification of Snow Particles." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86017.

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The simplest form of a snow particle is a hexagonal prism which can grow into a stellar crystal by growing branches from the six corners of the prism. The snow particle is affected by the temperature and supersaturation in the air, giving its unique form. Manual classification of snow particles based on shape is tedious work. Convolutional Neural Network (CNN) can therefor be of great assistance and are common in automatic image processing. From a data set consisting of 3165 images sorted into 15 shape classes, a sub set of 2193 images and 7 classes was used. The selected classes had the highe

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Dave, Palak P. "A Quantitative Analysis of Shape Characteristics of Marine Snow Particles with Interactive Visualization: Validation of Assumptions in Coagulation Models." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7279.

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The Deepwater Horizon oil spill that started on April 20, 2010, in the Gulf of Mexico was the largest marine oil spill in the history of the petroleum industry. There was an unexpected and prolonged sedimentation event of oil-associated marine snow to the seafloor due to the oil spill. The sedimentation event occurred because of the coagulation process among oil associated marine particles. Marine scientists are developing models for the coagulation process of marine particles and oil, in order to estimate the amount of oil that may reach the seaflo

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Tse, Ka-ki. "Multiple scattering of waves by dense random distributions of particles for applications in light scattering by noble metal nanoparticles and microwave scattering by terrestrial snow /." access full-text access abstract and table of contents, 2009. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ee-b23750558f.pdf.

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Thesis (Ph.D.)--City University of Hong Kong, 2009.<br>"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references.

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Aguilar, Boris. "Experimental study and numerical modeling of accretion phenomena of snow particles at the origin of the formation of accretions on aeronautical structures or civil engineering." Electronic Thesis or Diss., Toulouse, ISAE, 2024. http://www.theses.fr/2024ESAE0003.

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Pour garantir la sécurité des vols dans des conditions de neige, les constructeurs d'aéronefs doivent démontrer que chaque moteur et son système d'admission d'air peuvent fonctionner sur toute la plage de puissance de vol dans des conditions de neigeuse. Cette étude fait partie d'un effort visant à développer des modèles pour l'accumulation de neige.Pour établir le cadre de départ de ce travail sur la modélisation du givrage de la neige, le chapitre 1 est consacré à une revue de la littérature organisée en trois parties. Dans la première partie, les différents processus de création de neige da

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Sobhani, Negin. "Applications, performance analysis, and optimization of weather and air quality models." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5996.

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Atmospheric particulate matter (PM) is linked to various adverse environmental and health impacts. PM in the atmosphere reduces visibility, alters precipitation patterns by acting as cloud condensation nuclei (CCN), and changes the Earth’s radiative balance by absorbing or scattering solar radiation in the atmosphere. The long-range transport of pollutants leads to increase in PM concentrations even in remote locations such as polar regions and mountain ranges. One significant effect of PM on the earth’s climate occurs while light absorbing PM, such as Black Carbon (BC), deposits over snow. In

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Yndestad, Leif Kåre Hornnes. "Particle-based Powder-snow Avalanche Simulation Using GPU." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for datateknikk og informasjonsvitenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15063.

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The main focus of this thesis was the simulation of a powder-snow avalanche flow. The simulation were implemented using the particle-based simulation solution SPH, from a mathematical model describing powder-snow flow dynamics. The simulation was accelerated by applying the computational power of the GPU, in order to provide a faster simulation time than would have been achieved on the CPU.

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Yam, Emily M. "The Role of Bacteria-Particle Interactions in Marine Snow Dynamics." W&M ScholarWorks, 2007. http://www.vims.edu/library/Theses/Yam07.pdf.

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Vigano, Alessandro. "Experimental and numerical modeling of wet snow accretion on structures." Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2012. https://theses.hal.science/docs/00/78/61/89/PDF/A_VIGANO_PhD.pdf.

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Ce travail est consacré à l'étude du givrage atmosphérique des structures par accrétion de neige collante qui peut conduire à des dommages sévères aux structures. Les particules à la base de ce type d'accrétions sont caractérisées par un mélange d'eau et glace quantifié dans cette étude par un paramètre sans dimension : la teneur en eau liquide: TEL définie comme le ratio de la masse liquide sur la masse totale de la particule. La définition de la TEL considérée dans ce travail est différente de celle utilisée en aéronautique. Dans cette étude, la neige collante a été reproduite avec une tempé

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Sinclair, James R. "Positioning and timing calibration of SNO+." Thesis, University of Sussex, 2015. http://sro.sussex.ac.uk/id/eprint/57182/.

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The Sudbury Neutrino Observatory solved the solar neutrino problem, confirming neutri- nos have non-zero masses. Massive neutrinos raise questions about the nature of neutrinos, implying physics beyond the standard model and potentially a solution to the observed matter-antimatter asymmetry in the universe. The Sudbury Neutrino Observatory is be- ing upgraded, with the goal of probing the nature of neutrino masses. The experiment will also study reactor, geo, supernovae and solar neutrinos. The upgrade is characterised by changing the target mass from heavy water to scintillator. Using scintil

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Tuzet, François. "Dépôt, devenir et impact radiatif des impuretés dans le manteau neigeux : analyse des processus, simulations numériques et implications." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30316.

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L'une des propriétés les plus fascinantes de la neige est sa blancheur, capable de transformer complètement un paysage en quelques heures. Cette couleur vient de la capacité unique de la neige à réfléchir le rayonnement solaire dans les longueurs d'onde visibles, c'est-à-dire son fort albédo. Cette particularité de la neige est d'une importance cruciale pour le bilan énergétique de surface et par conséquent pour un large éventail de questions sociales, écologiques et climatiques. La blancheur de la neige peut, cependant, être altérée par la présence d'impuretés absorbantes. Dans les Alpes euro

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Bücher zum Thema "Snow particles"

Sunagawa, Ichiro. Morphology of Crystals : Part A : Fundamentals Part B : Fine Particles, Minerals and Snow Part C: The Geometry of Crystal Growth by Jaap van Suchtelen. Springer, 2011.

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Sunagawa, Ichiro. Morphology of Crystals: Part A: Fundamentals Part B: Fine Particles, Minerals and Snow Part C: The Geometry of Crystal Growth by Jaap van Suchtelen (Materials Science of Minerals and Rocks). Springer, 2007.

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Kammer, Steven. Characterisation of Metallic Particle Distributions by Scanning near-Field Optical Microscopy (Snom) in Simultaneous Reflection and Transmission Mode. Anchor Academic Publishing. ein Imprint der Diplomica Verlag GmbH, 2015.

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Kammer, Steven. Characterisation of Metallic Particle Distributions by Scanning near-Field Optical Microscopy (Snom) in Simultaneous Reflection and Transmission Mode. GRIN Verlag GmbH, 2014.

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Buchteile zum Thema "Snow particles"

MilNeil, Chris Neal. "Inner-City Glaciers." In Making the Geologic Now. punctum books, 2012. https://doi.org/10.21983/p3.0014.1.12.

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There is a sediment that hangs in a haze above city streets: a low-dose toxic dust of lead and chromates from tire wear, clouds of carbon soot mixed with hydrocarbon gases and fine particles of nitrates, sulfates, and other metals from exhaust pipes. At every stoplight, worn brake linings leave behind microscopic flakes of copper, zinc, and lead.These automotive disjecta membra are rarely visible; you might find them as a dirty streak on a handkerchief after wiping your brow on a humid day, or in the accumulated dust of an a/c unit’s intake. In most situations, these particles either disperse

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Alldredge, Alice L. "In Situ Collection and Laboratory Analysis of Marine Snow and Large Fecal Pellets." In Marine Particles: Analysis and Characterization. American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm063p0043.

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Davidson, Cliff I., Michael H. Bergin, and Hampden D. Kuhns. "The Deposition Of Particles and Gases to Ice Sheets." In Chemical Exchange Between the Atmosphere and Polar Snow. Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-61171-1_12.

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Glotov, Victor, and Nikita Glotov. "Mathematical Modeling of Snow Particles Transportation by Air Stream." In Lecture Notes in Networks and Systems. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11058-0_36.

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Hale, Robert C., Meredith E. Seeley, Ashley E. King, and Lehuan H. Yu. "Analytical Chemistry of Plastic Debris: Sampling, Methods, and Instrumentation." In Microplastic in the Environment: Pattern and Process. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78627-4_2.

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AbstractApproaches for the collection and analysis of plastic debris in environmental matrices are rapidly evolving. Such plastics span a continuum of sizes, encompassing large (macro-), medium (micro-, typically defined as particles between 1 μm and 5 mm), and smaller (nano-) plastics. All are of environmental relevance. Particle sizes are dynamic. Large plastics may fragment over time, while smaller particles may agglomerate in the field. The diverse morphologies (fragment, fiber, sphere) and chemical compositions of microplastics further complicate their characterization. Fibers are of grow

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Di Mauro, B., R. Garzonio, G. Baccolo, S. Gilardoni, M. Rossini, and R. Colombo. "Light-Absorbing Particles in Snow and Ice: A Brief Journey Across Latitudes." In Springer Series in Light Scattering. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87683-8_1.

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Ilgasheva, Ekaterina O., Ilya V. Yarmoshenko, Georgy P. Malinovskiy, and Andrian A. Seleznev. "Anthropogenic Particles in the Snow Cover in the Area of the Ice Race Track." In Springer Proceedings in Earth and Environmental Sciences. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49468-1_11.

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Huber, Christoph, Heinrich Reister, Thomas Binner, and Bernhard Weigand. "A New Process to Evaluate the Risk of an Engine Power Drop Caused by Snow Particles." In Progress in Vehicle Aerodynamics and Thermal Management. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67822-1_2.

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Li, Jiaqi, and Jiarong Hong. "Unveiling the Dynamics of Snow Settling in Atmospheric Turbulence: A Review of Nearly a Decade of Field Research at EOLOS, MN." In Proceedings of the IUTAM Symposium on Turbulent Structure and Particles-Turbulence Interaction. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-47258-9_4.

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Budd, W. F. "The Drifting of Nonuniform Snow Particles1." In Studies in Antarctic Meteorology. American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar009p0059.

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Konferenzberichte zum Thema "Snow particles"

Kim, R. S., S. Guduru, Y. Zhang, K. H. Lee, J. H. Park, and S. J. Kim. "P10 - Morphology Evolution of Snow-flakes Pattern and its Effect on Nano-/Micro-particles Embedded PbSe Photoconduc-tive Thin Film Characteristics." In SMSI 2025. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2025. https://doi.org/10.5162/smsi2025/p10.

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Mizuno, Soki, and Takahide Oya. "Design of single-electron information-processing circuit for particle computation." In 2024 IEEE Silicon Nanoelectronics Workshop (SNW). IEEE, 2024. http://dx.doi.org/10.1109/snw63608.2024.10639236.

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Miyakoshi, Ryoga, and Takahide Oya. "Design of Single-Electron Circuit Representing Brownian Motion of Particles to Implement Circuit Capable of Computing Diffusion Limited Aggregation Model." In 2024 IEEE Silicon Nanoelectronics Workshop (SNW). IEEE, 2024. http://dx.doi.org/10.1109/snw63608.2024.10638793.

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Veselovska, Ganna, and Grigoriy Khlopov. "Backscattering of electromagnetic waves by snow particles." In 2016 IEEE International Conference on Mathematical Methods in Electromagnetic Theory (MMET). IEEE, 2016. http://dx.doi.org/10.1109/mmet.2016.7544126.

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Romanova, Daria, Sergei Strijhak, and Matvey Kraposhin. "Development of snowYadeFoam solver for snow particles simulation." In 2020 Ivannikov Ispras Open Conference (ISPRAS). IEEE, 2020. http://dx.doi.org/10.1109/ispras51486.2020.00032.

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Kačianauskas, Rimantas, Arnas Kačeniauskas, Ruslan Pacevič, and Eugeniuš Stupak. "Packing of particles for DEM models of dry snow." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2020. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0081540.

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Dmitriev, Vladimir Timurovich, and Andrew Alekseevich Baukov. "Procedure for Detecting Rain and Snow Particles on Digital Television Images." In 32nd International Conference on Computer Graphics and Vision. Keldysh Institute of Applied Mathematics, 2022. http://dx.doi.org/10.20948/graphicon-2022-455-461.

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The relevance of the task of detecting and eliminating rain and snow particles in television images taken with static cameras is shown. The procedure for detecting rain and snow particles on video images, which is supposed to be used as part of an algorithm for reducing the visibility of precipitation, has been developed. The approach developed is presented in the form of three-stage classification of frame pixels into zones with moving objects and areas of stationary background, distorted and undistorted by precipitation particles. The procedure proposed has been studied and optimal values of

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Kool, Nina, Edwin Van der Weide, Ferdinand Spek, Harmen van der Ven, and Stefan van 't Hoff. "Snow Effects on the NGCTR Nacelle for Relevant Certification Conditions." In International Conference on Icing of Aircraft, Engines, and Structures. SAE International, 2023. http://dx.doi.org/10.4271/2023-01-1373.

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<div class="section abstract"><div class="htmlview paragraph">This paper is focused on the numerical analysis of the impingement and water catch rate of snow particles on the engine air intake of the Next Generation Civil Tilt Rotor (NGCTR). This NGCTR is developed by Leonardo Helicopters. The collection efficiency and water catch rate for the intake geometry are obtained for the test cases that have been defined for the relevant snow conditions. These conditions are related to the flight envelope of the NGCTR, existing EASA/FAA certification specifications, and the snow characteri

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Sasaki, Mikio, Takahiro Takeuchi, and Hiroshi Takahashi. "Energy Loss in Snow-Water Mixture Flow." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45493.

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Energy losses in the solid-water mixture flow where the density of solid is nearly equal to that of fluid were observed in horizontal pipelines. The observation was carried out to investigate the influence that the specific gravity of the solid particles exerted on the energy loss. A relative friction factor based on the friction factor of the pure water flow becomes larger as the solid concentration increases in the mixture flow of solid particles with the specific gravity 0.86 and 1.04. The relative friction factor is given with the Froude number, the solid concentration and the specific gra

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Makam, Sri Lalith Madhav, Srishty Shah, Rixson Varghese, and Rajat Walia. "Modelling of Airflow-Snow Interaction on Metal Surfaces Using FVM and SPH-Based Solvers on a Wedge Geometry." In WCX SAE World Congress Experience. SAE International, 2024. http://dx.doi.org/10.4271/2024-01-1969.

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<div class="section abstract"><div class="htmlview paragraph">The potential blinding of Advanced Driver Assistance Systems (ADAS) sensors due to contamination poses a notable threat to autonomous vehicles. These sensors' performance can be compromised by diverse sources such as dust, water, or snow. However, our investigation concentrates primarily on snow-related contamination, a frequent occurrence during winter. The accumulation of snow and ice significantly hampers the operational efficacy of autonomous vehicles. Over the years, a series of field tests and wind tunnel experimen

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Berichte der Organisationen zum Thema "Snow particles"

Thurston, Alison, Karen Foley, Shelby Rosten, Susan Taylor, Robert Haehnel, and Robyn Barbato. Microbial activity in dust-contaminated Antarctic snow. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/47681.

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During weather events, particles can accumulate on the snow near the Pegasus ice and Phoenix compacted-snow Runways at the US McMurdo Station in Antarctica. The deposited particles melt into the surface, initially forming steep-sided holes, which can widen into patches of weak and rotten snow and ice. These changes negatively impact the ice and snow runways and snow roads trafficked by vehicles. To understand the importance of microbes on this process, we examined deposited dust particles and their microbial communities in snow samples collected near the runways. Snow samples were analyzed at

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Thurston, Alison, Zoe Courville, Lauren Farnsworth, et al. Microscale dynamics between dust and microorganisms in alpine snowpack. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40079.

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Dust particles carry microbial and chemical signatures from source regions to deposition regions. Dust and its occupying microorganisms are incorporated into, and can alter, snowpack physical properties including snow structure and resultant radiative and mechanical properties that in turn affect larger-scale properties, including surrounding hydrology and maneuverability. Microorganisms attached to deposited dust maintain genetic evidence of source substrates and can be potentially used as bio-sensors. The objective of this study was to investigate the impact of dust-associated microbial depo

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Lever, James, Susan Taylor, Garrett Hoch, and Charles Daghlian. Evidence that abrasion can govern snow kinetic friction. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42646.

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The long-accepted theory to explain why snow is slippery postulates self-lubrication: frictional heat from sliding melts and thereby lubricates the contacting snow grains. We recently published micro-scale interface observations that contradicted this explanation: contacting snow grains abraded and did not melt under a polyethylene slider, despite low friction values. Here we provide additional observational and theoretical evidence that abrasion can govern snow kinetic friction. We obtained coordinated infrared, visible-light and scanning-electron micrographs that confirm that the evolving sh

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Lever, James, Susan Taylor, Arnold Song, Zoe Courville, Ross Lieblappen, and Jason Weale. The mechanics of snow friction as revealed by micro-scale interface observations. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42761.

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The mechanics of snow friction are central to competitive skiing, safe winter driving and efficient polar sleds. For nearly 80 years, prevailing theory has postulated that self-lubrication accounts for low kinetic friction on snow: dry-contact sliding warms snow grains to the melting point, and further sliding produces meltwater layers that lubricate the interface. We sought to verify that self-lubrication occurs at the grain scale and to quantify the evolution of real contact area to aid modeling. We used high-resolution (15 μm) infrared thermography to observe the warming of stationary snow

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Haehnel, Robert, Yonghu Wenren, and Luke Allen. SAGE-PEDD theory manual : modeling windblown snow deposition around buildings. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/44942.

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Numerical modeling of snowdrifting is a useful tool for assessing the impact of building design on operations and facility maintenance. Here we outline the theory for the SAGE-PEDD snowdrift model that has application for determining snowdrift accumulation around buildings. This model uses the SAGE computational fluid dynamics code to determine the flow field in the computational domain. A particle entrainment, dispersion, and deposition (PEDD) model is coupled to SAGE to simulate the movement and deposition of the snow within the computational domain. The report also outlines areas of future

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Barker, Amanda, Thomas Douglas, Erik Alberts, et al. Influence of chemical coatings on solar panel performance and snow accumulation. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/48059.

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Solar panel performance can be impacted when panel surfaces are coated with substances like dust, dirt, snow, or ice that scatter and/or absorb light and may reduce efficiency. As a consequence, time and resources are required to clean solar panels during and after extreme weather events or whenever surface coating occurs. Treating solar panels with chemical coatings that shed materials may decrease the operating costs associated with solar panel maintenance and cleaning. This study investigates three commercial coatings for use as self-cleaning glass technologies. Optical and thermal properti

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Beck, Aaron. North Sea Plastics I: Fate and impact of river-borne microplastics and their chemical additives in the North Sea Cruise No. AL586, 04 February – 10 February 2023, Kiel, DE – Kiel, DE. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2024. https://doi.org/10.3289/cr_al586.

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The river source of plastic debris to the southern North Sea region appears to be increasing over the past several decades, with a strong seasonal control on riverine MP transport and discharge. The current cruise, AL586, links plastic pollution in the North Sea to seasonal studies in the Elbe and Thames rivers as part of the H2020 LABPLAS project, with the objective to understand the transport and fate of river-derived small micro- and nanoplastics (SMNPs) in the North Sea. The specific objectives of the North Sea Plastics I & II cruises (the current cruise AL586 and planned cruise AL596)

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Beck, Aaron, and Anja Engel. North Sea Plastics II: Fate and impact of river-borne microplastics and their chemical additives in the North Sea Cruise No. AL596, 26 June – 02 July 2023, Kiel, DE – Kiel, DE. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2024. https://doi.org/10.3289/cr_al596.

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The river source of plastic debris to the southern North Sea region appears to be increasing over the past several decades, with a strong seasonal control on riverine MP transport and discharge. The current cruise, AL596, links plastic pollution in the North Sea to seasonal studies in the Elbe and Thames rivers as part of the H2020 LABPLAS project, with the objective to understand the transport and fate of river-derived small micro- and nanoplastics (SMNPs) in the North Sea. The specific objectives of the North Sea Plastics I & II cruises (the current cruise AL596 and previous cruise AL586

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