A5000466406- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Cryospheric studies and observations
- Methane Hydrates and Related Phenomena
- Freezing and Crystallization Processes
- Climate variability and models
- Icing and De-icing Technologies
- Oceanographic and Atmospheric Processes
- nanoparticles nucleation surface interactions
- Ocean Waves and Remote Sensing
- Smart Materials for Construction
- Soil and Unsaturated Flow
- Clinical Nutrition and Gastroenterology
- Metabolism and Genetic Disorders
- Hydrocarbon exploration and reservoir analysis
- Spacecraft and Cryogenic Technologies
- Healthcare Systems and Challenges
- Geological Studies and Exploration
- Urban Stormwater Management Solutions
- Marine and environmental studies
- Winter Sports Injuries and Performance
- Scientific Research and Discoveries
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Ocean Acidification Effects and Responses
Norwegian University of Science and Technology
2016-2025
University of Bergen
2011-2012
Earth Science Institute of the Slovak Academy of Sciences
2011-2012
Year-round observations of the physical snow and ice properties processes that govern pack evolution its interaction with atmosphere ocean were conducted during Multidisciplinary drifting Observatory for Study Arctic Climate (MOSAiC) expedition research vessel Polarstern in Ocean from October 2019 to September 2020. This work was embedded into interdisciplinary design 5 MOSAiC teams, studying atmosphere, sea ice, ocean, ecosystem, biogeochemical processes. The overall aim characterize cover...
Low-salinity meltwater from Arctic sea ice and its snow cover accumulates creates under-ice layers below ice. These can result in the formation of new layers, or false bottoms, at interface this low-salinity colder seawater. As part Multidisciplinary drifting Observatory for Study Climate (MOSAiC), we used a combination coring, temperature profiles thermistor strings underwater multibeam sonar surveys with remotely operated vehicle (ROV) to study areal coverage temporal evolution bottoms...
The microstructure of sea ice depends on growth rate. During cooling and internal freezing the pore space evolves in a way that its directed percolation threshold ϕ c increases with cubic root velocity.
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The transport of fluid and gas through sea ice has an impact on many properties atmosphere-ice-ocean exchange processes. It depends the details pore space. Of particular interest is condition at which space no longer connected, often termed percolation threshold, for most investigators have proposed/accepted a value 5 % in brine volume fraction. However, direct observations been sparse theories to predict threshold remained unvalidated. In presented talk concise model vertical presented....
Abstract. The hydraulic permeability of sea ice is an important property that influences the role in environment many ways. As it difficult to measure, so far not observations exist, and quality deduced empirical relationships between porosity unknown. present work presents a study young based on combination brine extraction centrifuge, X-ray micro-tomographic imaging direct numerical simulations. approach new for ice. It allows us relate percolation properties explicitly characteristic pore...
Frost salt scaling of concrete is related to cyclic freezing and melting a few millimeter thick deicer solution on the surface concrete. It almost absent when pure water reaches maximum at so-called pessimum concentration that for NaCl around 3%. Different mechanisms have been suggested explain this frost in general, ranging from transport moisture growth ice within pore space ("cryogenic suction") crack formation saline layer followed by spalling off ("glue-spall"). Though these theories...
Abstract. Ice and snow in the environment are important because they not only act as a host to rich chemistry but also provide matrix for physical exchanges of contaminants within ecosystem. This review discusses how structure influences both chemical reactivity processes, which thereby makes unique medium study. The focus is placed on impacts presence liquid surface disorder using many experimental studies, simulations, field observations from molecular micro-scale.
Abstract The fractionation of major sea-water ions, or deviation in their relative concentrations from Standard Mean Ocean Water ratios, has been frequently observed sea ice. It is generally thought to be associated with precipitation solid salts at certain eutectic temperatures. the variability found bulk sea-ice samples indicates that ions depends on often unknown thermal history ice, which affects structure pore networks and fate within them. Here we investigate distribution Arctic ice a...
Abstract We present results from a laboratory tank study of ice growing saline water in wave field, focusing on the transition predominantly frazil/grease-ice cover to pancake-ice cover. Combining surface temperature observations with direct and indirect determinations salinity solid fraction, we describe evolution frazil- area solid-ice volume fraction over course 1 day. In investigated stage transition, frazil surrounding pancakes was found have rather constant properties: 0.4–0.6 K below...
[1] The warm and saline inflow of the North Atlantic Current to Nordic Seas is highly relevant for region global climate. Greenland-Scotland Ridge, Norwegian consists two 40–60 km wide branches, situated at slope 150–200 offshore, respectively. To interpret changes in these branches terms climate variability northern Atlantic, it important understand their spatiotemporal response both atmospheric forcing advection. We analyzed three decades synoptic hydrographic observations branches'...
Abstract Under turbulent conditions ice growth in sea water often occurs as tiny suspended frazil crystals. When the turbulence is insufficient to keep crystals suspension, they may accumulate a surface grease layer of pure and water. Here we give an account this low solid fraction high salinity prior its freeze-up into cover. We provide equations for determining bulk salinity, S g , volume fraction, ϕ s by indirect direct methods, review previous observations, present new data. For...
Abstract. Ice growth in turbulent seawater is often accompanied by the accumulation of frazil ice crystals at its surface, forming a grease layer. The thickness and volume fraction this layer play an important role shaping gradual transition from loose to solid cover, however, observations are very sparse. Here we analyse extensive set ice, grown two parallel tanks with controlled wave conditions thermal forcing, focusing on first one days accumulation. following unresolved issues addressed:...
Low-salinity meltwater from Arctic sea ice and its snow cover accumulates creates under-ice layers below ice. These can result in the formation of new layers, or false bottoms, at interface this low-salinity colder seawater. As part Multidisciplinary drifting Observatory for Study Climate (MOSAiC), we used a combination coring, temperature profiles thermistor strings underwater multibeam sonar surveys with remotely operated vehicle (ROV) to study areal coverage temporal evolution bottoms...
The maximum dense shelf water salinity formed during winter in the Svalbard Bank area of north-western Barents Sea is reconstructed for period 1952–2000 by analysing transformation summer remnants. variability 34.7 - 35.4, waters being at freezing point, mainly generated interannual variations near surface salinity. On time scales latter strongly linked to sea ice import. In contrast, no correlation Atlantic Water (AW) throughflow Arctic Ocean with import found. Salinities both site...
This study characterizes the refreezing process of deformed ice. Twenty laboratory experiments in ice ridge consolidation were conducted to influence blocks size, initial temperature, and top surface roughness on rate. Experiments covered a block thickness range 2–6 cm, temperatures from −1 °C −23 °C, sail height up 3 consolidated layer 14 cm. with average value convectional heat transfer coefficient 20 W/m2K. The presented analytical model for solidification was able predict observed growth...
Abstract Columnar sea ice grows with an interface of tiny parallel plates, the distance which is known as plate spacing. While it has been proposed a fundamental microstructure scale ice, physics behind its formation not fully understood. Here problem analysed on basis morphological stability theory to propose model that results in physically consistent prediction relationship between spacing 0 and growth velocity V . The may be divided into two regimes. In diffusive regime, for above ≈2 ×...
Abstract We analysed the three-dimensional microstructure of sea ice by means X-ray-micro computed tomography. Microscopic (brine- and air- pore sizes, numbers connectivity) macroscopic (salinity, density, porosity) properties young Arctic were analysed. The analysis is based on cores obtained during spring 2016. Centrifuging brine prior to CT imaging has allowed us derive confident relationships between open, vertically connected total porosity at relatively high temperatures. dependence...
Abstract. The hydraulic permeability of sea ice is an important property that influences the role in environment many ways. As it difficult to measure, so far not observations exist and quality deduced empirical relationships between porosity unknown. present work presents a study young based on combination X-ray tomographic imaging direct numerical simulations. approach new for ice. It allows relate percolation properties explicitly characteristic pore space, particular size connectivity...
Coastal cold climates experience frequent intermittent melting and freezing periods over the period. This in stormwater systems affects infiltration capacity hence performance. paper investigates of engineered filter media (composed sand mixed with charcoal, pine bark, or olivine) under temperatures a column-based laboratory setup. Infiltration into partially frozen was replicated using climate room. The columns were brought to −2.5 °C, water at +2 °C percolated through constant head 5 cm....
Abstract. Ice growth in turbulent seawater is often accompanied by the accumulation of frazil ice crystals at its surface. The thickness and volume fraction this layer play an important role shaping gradual transition from a loose to solid cover, however, observations are very sparse. Here we analyse extensive set ice, grown two parallel tanks with controlled wave conditions thermal forcing, focusing on first one days grease accumulation. following unresolved issues addressed: (i) which...