Previous Seminars

How to use calendars

Speaker: 
Morten & Lars-Gunnar
Seminar Date: 
4. October 2012 - 12:15 - 13:00

We will go through all the nifty, useful and amazing features of using a calendar to organize your life AND the Nansen Center.

Since we have different calendar applications, we will divide this tutorial into groups:

Time: Calendar software
12:00 Thunderbird with calendar add-on Lightning for Linux/Mac/Windows
12:20 iCal for Mac
12:40 Microsoft Outlook 2007 for Windows

The tutorial will focus on:

1. How to create an event
2. How to invite people
3. How to book room and other resources
4. How to look at other people and room's calendar.

Recent changes in the Arctic sea ice kinematics: a way of looking at the accelerating sea ice decline

Speaker: 
Pierre Rampal
Seminar Date: 
27. September 2012 - 12:30 - 13:00

In this talk we will review the changes observed in the Arctic over the past 30 years in terms of sea ice drift and deformation. We will present how these changes may have played a role in the recent sea ice cover decline. Also, a brief evaluation of the sea ice drift and thinning trends simulated by the CMIP3 climate models will be presented. Still from the ice kinematics perspective, we will discuss why these trends are underestimated by the current climate models.

Modeling progress on wave-ice interactions

Speaker: 
Timothy Williams
Affiliation: 
NERSC
Seminar Date: 
20. September 2012 - 12:30 - 13:15

I will describe modeling progress on wave-ice interactions (the WIFAR project: Waves in Ice For ARctic operators) in the marginal ice zone (MIZ).

Aspects of this include how the wave energy is included and attenuated, criteria for when floes should break, and the resulting floe size distribution (FSD) produced when breaking happens.

There are still many uncertainties in the ice properties such as thickness, elastic properties (eg Young's modulus), and the FSD remains generally unobservable making validation problematic.

On the role of atmospheric heat capacity in the climate system

Speaker: 
Dr. Richard Davy
Seminar Date: 
13. September 2012 - 12:30 - 13:00

The response of the surface air temperature to forcing at a given timescale depends on three factors: the magnitude of the forcing, any feedback effects and the effective heat capacity of the atmosphere. We propose that spatial-temporal signatures of climate change can, in part, be explained from differences in the effective heat capacity of the atmosphere. We have falsified this hypothesis through the analysis of temperature records from daily to inter-decadal timescales using observational and reanalysis datasets.

A better representation of sea ice dynamics in ocean models

Speaker: 
Sylvain Bouillon
Affiliation: 
Georges Lemaître Centre for Earth and Climate Research, Earth and Life Institute, Université catholique de Louvain, Belgium
Seminar Date: 
14. August 2012 - 11:15 - 11:45

Representing sea ice dynamics is complex but crucial for coupled ice-ocean models. Formation of leads, polynias and ice ridges completely changes interactions between the atmosphere and the ocean. Increasing the spatial resolution or improving the numerical scheme does not help to simulate the observed behaviour of sea ice characterised by the strong intermittency and localisation of the deformation.

Simulation of Construction-Related Climate Parameters and Extremes in Bergen-Hardanger Region

Speaker: 
Yiwen Xu
Seminar Date: 
28. June 2012 - 12:30 - 13:00

Regional climate downscaling was performed with the Weather Research and Forecast Model (WRF) to investigate the variability of climate parameters relevant to the construction of infrastructures over very complex terrain of the Norwegian west coast. As the typical scales of the terrain variability are of order of one kilometer, the simulations were conducted at the horizontal resolution of 1km x 1km with the initial and boundary conditions provided by the Norwegian Earth System Model (NORESM1-M).

The Statistics of Extreme Winds in Regional Climate Models

Speaker: 
Stephen Outten
Affiliation: 
NERSC
Seminar Date: 
21. June 2012 - 12:30 - 13:00

A critical component of climate change adaptation is to improve our understanding of extreme events and to estimate how their frequency and magnitude are likely to vary in the future. The prediction of extremes represents a difficult problem since it often involves predicting events that are rarer than anything observed in the data available e.g. predicting a 100 year event with 30 years of data. Extreme value theory provides a framework that enables such an extrapolation, and its two main methods will be presented and discussed.

A sensitivity study of radiatively induced self-lifting in WRF-Chem

Speaker: 
Tobias Wolf
Affiliation: 
applicant for Ph.D. position at NERSC
Seminar Date: 
15. June 2012 - 11:30 - 12:00

Radiation absorption within plumes of absorbing aerosols could lead to efficient vertical
transport. This was first discussed in the framework of the “nuclear winter” theory. Later,
observational evidence of self-lifting was found for plumes from oil fires.
Wildfire aerosol plumes act absorbing. Thus, they might be capable of radiatively induced
self-lifting. The radiative forcing of wildfire aerosol plumes is highly dependent on their
altitude. Therefore, it is important to understand the effects of self-lifting on the vertical
propagation and lifetime of wildfire aerosol plumes.

Bergen Air Quality: Observations and Simulations

Speaker: 
Igor Esau
Affiliation: 
CGR
Seminar Date: 
14. June 2012 - 12:15 - 13:00

Atmospheric conditions observed during the cold winter 2010-2011 in Bergen resulted in a case of extreme air
quality hazard. Very high concentrations of the atmospheric pollutants, notably NO2, were measured. Attempts to
reduce their emission rates by policy measures leaded to city life disorganization and severe economic damage.
Using the advantage of turbulence-resolving simulations and extensive meteorological observations in the city,
analysis of the event has been conducted. The simulations (the mesh resolution was 30 m) combined with the

Arctic sea ice decline and ice export in the CMIP5 historical simulations

Speaker: 
Florian Geyer
Affiliation: 
Nansen Environmental and Remote Sensing Center
Seminar Date: 
31. May 2012 - 12:30 - 13:00