Previous Seminars

On the ongoing development of a new rheological model for a better representation of the drift and deformation of sea ice

Speaker: 
Véronique Dansereau
Affiliation: 
Centre National de la Recherche Scientifique - Institut des Sciences de la Terre, Grenoble, France, and Nansen Environmental and Remote Sensing Center, Bergen, Norway
Seminar Date: 
4. June 2018 - 11:00 - 11:30

Dansereau, V.*, Weiss, J., Saramito, P., Rampal, P., Bouillon, S., Olason, E.

Introductory Course On Statistical Modeling Of Extreme Values

Speaker: 
Hans Wackernagel
Affiliation: 
Equipe de GEOSTATISTIQUE - MINES ParisTech - PSL
Seminar Date: 
31. May 2018 - 10:15 - 1. June 2018 - 15:00

Extreme value theory is based on different principles than those
of conventional statistics as it is designed to study and model
exceptional events rather than the average characteristics of
natural phenomena.

This two-day introductory course will start by presenting
exploratory tools to analyze the behavior of extreme values in
geophysical data. This will help to motivate the basic principles
of the statistical modeling of extreme values and the
distributions that characterize them. The two common approaches
for assessing the risk of extreme events at a given level, i.e.

Study of the Kuroshio intrusion events by the identified paths into the South China Sea using an improved synthetic method

Speaker: 
Dazhi Xu
Affiliation: 
Visiting Scholar from South China Sea Marine Prediction Center, Guangzhou China
Seminar Date: 
28. May 2018 - 13:00 - 13:45

Originating from the North Equatorial Current (NEC), the Kuroshio is the strongest ocean current in the northwest Pacific, which is characterized by high temperature, high salinity, narrow band, and large flow velocity and its variable rate. When passing by the Luzon Strait (LS), a branch of the Kuroshio flows into the South China Sea (SCS) and affects the circulation and temperature-salinity structure in the SCS.

Ocean Acoustic Tomography in the North Atlantic

Speaker: 
Brian Dushaw
Affiliation: 
Nansen Center, Bergen, Norway
Seminar Date: 
15. May 2018 - 13:00 - 14:00

An objective mapping exercise was used to assess the resolution capabilities of ocean acoustic tomography in combination with Argo floats. Basis functions for a basin-wide area are derived from a covariance computed using an ocean state estimate. As is demonstrated by the formal uncertainty estimates from this computation, Argo and tomography are complementary measurements. In several examples, each separately gives results with comparable uncertainty, while when both are employed, uncertainties are reduced by O(50%).

Tutorials on data assimilation

Speaker: 
Patrick N. Raanes
Affiliation: 
NORCE / NERSC
Seminar Date: 
7. May 2018 - 10:00 - 12:00

NERSC is a world leader in data assimilation (DA) using the ensemble Kalman filter (EnKF). As a "farewell" seminar, Patrick N. Raanes will give some tutorials on the subject. The tutorials (i) provide a hands-on introduction; (ii) use Python, but are accessible for Matlab users; (iii) have already been used for two (and counting) short courses given at NERSC; (iv) have been developed alongside the underlying DA package (DAPPER), in part with internal, basic funding.

Note: Bring your laptops! (fear not: we'll not install anything)

Evolutions of the Arctic MFC in an evolving CMEMS 2018-2021.

Speaker: 
L. Bertino
Affiliation: 
NERSC
Seminar Date: 
20. March 2018 - 11:15 - 12:00

The Copernicus Marine Services (CMEMS) have kicked off their second phase for the period Jan-2018 to Mar-2021. The Arctic MFC, like other elements of CMEMS, has ambitious plans for modeling, assimilation of new Copernicus observations for forecasts and reanalyses and data dissemination. This presentation aims at keeping you updated with the main changes and discuss how NERSC can make the best out of the Copernicus programme.

Seasonal to decadal prediction skill in "our" region of Norwegian Climate Prediction model

Speaker: 
Climate Dynamics and Prediction (Yiguo Wang)
Seminar Date: 
6. March 2018 - 11:15 - 11:45

Recently it has been demonstrated that the slow fluctuations of the climate can be predicted up to a decade in advance in region such as in the North Atlantic. Prediction of near-term climate changes is of great interest to stakeholders e.g., fisheries, energy, shipping, farming, and insurance sectors. The Bjerknes Centre has developed climate prediction capability (the Norwegian Climate Prediction Model, NorCPM) that makes use of existing observations to control the internal variability of the climate that drives these slow fluctuations.

Automatic iceberg detection in the Barents Sea using SAR and optical images

Speaker: 
Ocean and Sea Ice Remote Sensing (Ingri Halland Soldal)
Seminar Date: 
20. February 2018 - 11:15 - 11:45

Icebergs can be a threat to maritime operations which makes it important to monitor their existence and position. Most methods for automatic iceberg detection are applied to icebergs much larger than the typical size one can find in the Barents Sea, and they are therefore not applicable to this area.

Nansen Guest Lecture: Dynamical down scaling: How confident are the projections?

Speaker: 
Professor Jens Hesselbjerg Christensen
Affiliation: 
Københavns Universitet
Seminar Date: 
19. February 2018 - 12:00 - 12:30

Info about Jens:
Jens Hesselbjerg Christensen is professor in climate at University of Copenhagen, since 2017. Before he was at DMI, and head of the Danish Climate Center. Jens has been enrolled in the IPCC work for many years, and has been Lead Author on many important IPCC reports.
He is a world leading scientist on Regional Climate Modeling (RCM) with focus on high latitude conditions.

The introduction of VMware - An overview of server virtualization at NERSC

Speaker: 
IT-group (Morten Stette)
Seminar Date: 
6. February 2018 - 11:15 - 11:45