Internal seminar

warning: Creating default object from empty value in /var/www/html/drupal/modules/taxonomy/taxonomy.pages.inc on line 33.
Bi-weekly Tuesday NERSC Internal 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.

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.

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.

Presentation on The Framework for Aquatic Biogeochemical Models (FABM): a Fortran 2003 programming framework for biogeochemical models of marine and freshwater systems.

Speaker: 
Karsten Bolding
Affiliation: 
Bolding & Bruggeman ApS
Seminar Date: 
23. August 2017 - 13:00 - 13:30

Efficient coupling of ocean models (physics) and bio-geochemistry has traditionally been a resource demanding endeavor. Typically the ocean model exists and the bio-geochemistry must be implemented as an add-on without a clear defined application programming interface (API). The result being that each implementation of a new bio-geochemical model in a given physical model lead to ad-hoc solutions only working for the specific models in question.

Investigation of the impact of correlated observation errors on data assimilation

Speaker: 
Rémy Dubois
Affiliation: 
Ecole des Mines ParisTech
Seminar Date: 
15. August 2017 - 12:30 - 13:10

Data assimilation (DA) are still facing various challenges and one of these challenges is the lack of knowledge on the observation error covariance matrix. Focusing on the observation error correlation, this seminar will begin by presenting Python3's DAPPER environment, followed by the presentation of various DA experiments performed with the EnKF in the Lorenz95 model (e.g. inflation of diagonal R matrices and thinning correlated structures) and the LETKF on the Quasi-Geostrophic model (innovative way to track the observations).

Geometric tools for the analysis of the stability of traveling waves

Speaker: 
Armand Vic
Affiliation: 
École Normale Supérieure (ENS) of Rennes, France
Seminar Date: 
17. August 2017 - 12:30 - 13:00

Travelling waves appear naturally in many various domains in physics such as fluid mechanics,
electromagnetic theory, etc. Intuitively, a travelling wave is a recognizable shape (of energy for
instance) which is transferred from one part of the medium to another part with a constant
speed of propagation. A broad question tackled in
geophysics is whether small errors in initial conditions can bring huge errors when

Presentation of IT-group

Speaker: 
Lars-Gunnar Persson (IT Group)
Seminar Date: 
13. June 2017 - 11:15 - 11:45

Information about our IT services and tasks challenges in IT security.

Improving the sea ice thickness of TOPAZ by the merged weekly product from Cryosat2 and SMOS

Speaker: 
Jiping Xie from Ocean Modeling
Seminar Date: 
30. May 2017 - 11:15 - 11:45

A merged measurements of Sea Ice Thickness (SIT) from CryoSat2 and SMOS has been distributed in recent years. This product is weekly during the cold season and available since October 2010. As a potential operational SIT observation in Arctic, the quantitative evaluation of its impact on the performance of TOPAZ, which represents the Arctic component of the Copernicus Marine Environment Monitoring Service (CMEMS), is an essential issue due to the well-known SIT errors in most marine forecast systems.

Data assimilation of sea ice concentration: a twin experiment within the Norwegian Climate Prediction Model

Speaker: 
Madlen Kimmritz from Climate Dynamics and Prediction
Seminar Date: 
16. May 2017 - 11:15 - 11:45

A method capable of constraining the sea ice of a coupled climate system in a dynamically consistent manner would be of crucial societal importance.
It would allow for more accurate and reliable reconstruction of the climate that would improve the understanding of the sensitivity of our climate to anthropogenic forcing and enhance the skill of climate prediction on seasonal-to-decadal time scale.

Urban heat island effect in the Arctic

Speaker: 
Victoria Miles from Climate Processes
Seminar Date: 
2. May 2017 - 11:15 - 11:45

Urbanization in the Arctic and sub-Arctic is an increasingly important anthropogenic influence on climate, and has significantly affected terrestrial ecosystems. One of the most evident effects associated with urbanization is the urban heat island (UHI), when urban and suburban areas are warmer then rural areas. The effect is more pronounced in the high latitudes.

Syndicate content