Previous Seminars

Towards making NERSC a primary data and service provider

Speaker: 
Scientific Data Management (Aleksander Vines & Tor I. Olaussen)
Seminar Date: 
5. December 2017 - 11:15 - 11:45

Scientists at NERSC combine observations, models and data assimilation to advance the understanding of the environment, and to develop innovative solutions and services for our stakeholders. A significant amount of effort goes into generation and documentation of datasets, and both scientists and the center should receive due credit. As the size and number of datasets produced and utilized at NERSC is steadily increasing, the need for a systemised organisation of this data emerges. In addition, RCN and EU require, as a general rule, that data produced shall be published with open access.

INTAROS: Integrated Arctic Observing System – WP4: Enhance community-based observing.

Speaker: 
Polar Acoustics and Oceanography (Lisbeth Iversen)
Seminar Date: 
1. December 2017 - 11:15 - 11:45

The overall objective in the INTAROS WP 4 is to enhance community-based observing for participatory research and capacity-building. There are several specific objectives in this workpackage. Task 1 will survey and analyze existing community-based observing programs, building on Report of SAON Task 9, in order to identify capabilities, ’best’ practices, and challenges in current Community-Based Monitoring Programs in the Arctic. Task 2 will advance tools for cross-fertilizing indigenous and local knowledge with scientific knowledge, and make examples of Arctic CBM manuals broadly available.

Modeling the Turkish Straits System and using Data Assimilation as a tool for observing network design

Speaker: 
Data Assimilation (Ali Aydoğdu)
Seminar Date: 
28. November 2017 - 11:15 - 11:45

A high-resolution unstructure mesh model of the Turkish Straits System (TSS) is developed. Multi-year simulations of the TSS are performed for the integral system using realistic atmospheric forcing between 2008-2013. The dynamics and circulation of the system is analyzed using a multi-year numerical simulations for the first time. The TSS, being the bridge between the Black and Mediterrean Seas, is a crucial component for the operational forecast systems of the two marginal seas.

Climate change in Georgia

Speaker: 
Mariam Elizbarashvili
Affiliation: 
University, Tbilisi, Georgia
Seminar Date: 
9. November 2017 - 14:30 - 15:30

Mariam Elizbarashvili is visitor of Yongqi

On the statistical properties of sea ice lead fraction and heat fluxes in Arctic

Speaker: 
Sea Ice Modelling (Einar Olason)
Seminar Date: 
17. October 2017 - 11:15 - 11:45

Heat flux through leads and polynyas is an order of magnitude larger than that through unbroken ice. In this presentation we explore some statistical properties observed in Arctic sea ice lead fraction, showing that our model (neXtSIM) does a good job at reproducing the observed statistics. Given the importance of heat flux through leads we then use the model to explore the statistical properties of the modelled heat fluxes. We show that the model reproduces well the probability density function (PDF) and the mono-fractal spatial scaling of observed lead fluxes in the Central Arctic.

Two new PhD students at NERSC presents themselve and their projects.

Speaker: 
Artem Moiseev and Fabio Mangini
Seminar Date: 
12. October 2017 - 12:30 - 13:00

Bergen Teknologioverføring

Speaker: 
Steffen Boga
Affiliation: 
Bergen Teknologioverføring
Seminar Date: 
28. September 2017 - 12:30 - 13:00

As the Technology Transfer Office in Bergen, BTO supports research institutions in the region, from guiding good ideas towards commercialization of research and societal benefits. Innovation is one of the four social responsibilities in the Norwegian Act relating to universities, together with research, education and dissemination. BTO supports researchers developing innovative research ideas.

A robust solver for viscous plastic sea ice models in a finite element framework

Speaker: 
Carolin Mehlmann
Affiliation: 
"Numerical Mathematics with Applications" group at the Otto-von-Guericke university, Magdeburg, Germany
Seminar Date: 
27. September 2017 - 15:00 - 16:00

Subject of this talk are the mathematical challenges and the numerical treatment of large scale sea ice problems. The model under consideration goes back to Hibler ("A dynamic thermodynamic sea ice model", J. Phys. Oceanogr., Hibler 1979) and is based on a viscous-plastic description of the ice as a two-dimensional thin layer on the ocean surface.

Geo-Scientific Platform-as-a-Service - tools and solutions for effective access and analysis of oceanographic data

Speaker: 
Ocean and Sea Ice Remote Sensing (Morten Hansen)
Seminar Date: 
12. September 2017 - 11:15 - 11:45

Existing roadmap projects for infrastructure under the Norwegian Research Council, i.e., NorDataNet, NMDC and NORMAP, provide open data access through the OPeNDAP protocol following the conventions for CF (Climate and Forecast) metadata, designed to promote the processing and sharing of files created with the NetCDF application programming interface (API). This approach is now also being implemented in the Norwegian Sentinel Data Hub (satellittdata.no) to provide satellite EO data to the user community.

A fully probabilistic data assimilation approach for range-limited observations

Speaker: 
Abhishek Shah
Seminar Date: 
7. September 2017 - 12:30 - 13:00

Many of the measurements available in the atmospheric or oceanographic systems are only available within a limited interval of actual variation of the quantity due to the limitation of gauge or data retrieval techniques i.e, observations with detection limit. For e.g., SMOS retrieved sea-ice thickness. These observations with detection limits contains hard data (quantitative) and soft data (qualitative). The current work focuses on the development and application of the data assimilation scheme for the observations with detection limit.