Tidligere arrangementer - Side 128
Recent findings show that moderate mixing levels typical of mid-latitude can erode or even remove the Arctic cold halocline layer and that internal wave induced mixing is enhanced in the absence of sea ice. In a seasonally ice-free Arctic Ocean increased levels of mixing, sufficient to remove the cold halocline layer, can be expected as a result of wind energy input over large areas of open water. The ice is then easily exposed to the relatively warm Atlantic water, possibly leading to a strong positive feedback. I will report on insight gained from field work conducted during the International Polar Year. Detailed finescale and turbulence measurements were made from drifting ice in the central Arctic and in the southern Yermak Plateau located in the Marginal Ice Zone northwest of Svalbard. Observations are analyzed to describe the characteristics of internal waves and turbulent mixing in the Arctic Ocean. The role of diapycnal mixing away from abyssal plains is discussed for the Arctic Ocean and regional heat budget and ice cover.
Ilker Fer is at the Department of Geophysics at UiB
Fredagskollokvium
Anders L?land, Norsk Regnesentral, skal snakke om
Finding a valid matrix of correlations
This paper presents a Bayesian hierarchical space-time stochastic model for significant wave height. The model has been fitted by data for an area in the North Atlantic ocean and aims at describing the temporal and spatial variability of significant wave height in this area. It could also serve as foundation for further extensions used for long-term prediction of significant wave height and future return periods of extreme significant wave heights. The main model and preliminary simulation results will be presented. Furthermore, a discussion of possible model extensions and future work will be included.
Erik Vanem is at the Statistics division of the Department of Mathematics at UiO
Friday seminar by Kevin M. Bailey
Fredagskollokvium
Ingrid Hob?k Haff, Norsk Regnesentral, skal snakke om Comparison of estimators for pair-copula constructions
Friday seminar by Jorijntje Henderiks
Fredagskollokvium
Fredagskollokvium
?rnulf Borgan, Matematisk Institutt, Universitetet i Oslo, skal snakke om
Assessment of evaluation criteria for survival prediction from genomic data
Friday Seminar by Yngvild Vindenes
CEES/MERG Extra seminar by Ulf Büntgen
Friday seminar by Göran E. Nilsson
Friday Seminar by Keith Brander
Gjesteforelesning ved professor emeritus Thorleif Anthonsen, NTNU, Trondheim.
Friday seminar by Ole Herman Ambur
Partnerforums andre m?te i ?konomistyringsnettverket.
M?let for seminaret var ? utforske hvordan teori kan bidra til ? belyse forutsetningene for god informasjonsstr?m og tillit mellom departement og underliggende virksomheter. Seminaret presenterte erfaringer fra virksomhetsledere om hvordan det oppleves ? bli styrt.
We present a fast marching level set method for reservoir simulation based on a fractional flow formulation of two-phase, incompressible, immiscible flow in two or three space dimensions. The method uses a fast marching approach and is therefore considerably faster than conventional finite difference methods. The fast marching approach compares favorably with a front tracking method as regards both efficiency and accuracy. In addition, it maintains the advantage of being able to handle changing topologies of the front structure.
Co-authored with Knut-Andreas Lie and Kenneth Karlsen
Nils Henrik Risebro is professor at CMA