Sökning: "ice growth"

Visar resultat 6 - 10 av 72 avhandlingar innehållade orden ice growth.

1. 6. Molecular investigations of atmospherically relevant interface processes: ice formation and water accommodation on ice and organic surfaces

   Författare :Xiangrui Kong; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; atmosphere; kinetics; Environmental molecular beam; ice nucleation; supersaturation; accommodation coefficient; phase transition; alcohols; green chemistry;

   Sammanfattning : Clouds and aerosols play important roles in the climate system by affecting on atmospheric chemistry, the radiation budget of the atmosphere, and the water cycle including the formation of precipitation. Climate models with predictive power require quantitative descriptions of aerosols and clouds, but several key processes remain to be fully understood. LÄS MER

3. 7. Numerical modelling of the Cordilleran ice sheet

   Författare :Julien Seguinot; Arjen Stroeven; Shawn Marshall; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Numerical modelling; Cordilleran ice sheet; last glacial cycle; Physical Geography; naturgeografi;

   Sammanfattning : This doctoral dissertation presents a study of the glacial history of the North American Cordillera using numerical ice sheet modelling calibrated against field evidence. This area, characterized by the steep topography of several mountain ranges separated by large inter-montane depressions, was once covered by a large-scale ice mass: the former Cordilleran ice sheet. LÄS MER

4. 8. Improved Cloud Parameterization in Global Climate Model : Aerosol effects and secondary ice production mechanisms

   Författare :Arti Jadav; MERGE: ModElling the Regional and Global Earth system; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cloud; Coud parameterization; Primary ice mechanisms; Secondary ice production; Global climate model;

   Sammanfattning : The response of clouds to the changes in climate is uncertain, and the representation of the cloud-climate feedback is a key challenge in the global circulation models (GCM) for future climate projections. Factors contributing to this uncertainty include processes that involve particles of various sizes and phases, as well as the interactions between these particles and the surrounding atmosphere. LÄS MER

5. 9. Frazil ice at water intakes

   Författare :Annika Andersson; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

   Sammanfattning : To provide a better understanding of how frazil ice deposits on trash racks at water intakes, the phenomenon was video recorded at two hydropower plants and in a refrigerated laboratory flume. Initial accretion of frazil ice around a single bar and the motion of particles in the vicinity of an obstacle was simulated through numerical modelling and studied using plastic particles in a laboratory flume. LÄS MER

7. 10. Optical and x-ray studies of ice growth in water

   Författare :Niloofar Esmaeildoost; Jonas Sellberg; Hans Hertz; Thomas Hansen; KTH; []
   Nyckelord :Physics; Fysik;

   Sammanfattning : The key purpose of this thesis is to study the structure of metastable water and its transformation into ice upon deep supercooling using x-ray scattering as well as optical microscopy. In all experiments, micrometer-sized water droplets were evaporatively cooled in vacuum and probed either by x-rays or optical illumination. LÄS MER