Seminar

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Weekly Lunch Seminars / Thursday Seminars - an open seminar for all

Two-way nesting in coupled atmosphere-ocean modelling

Speaker: 
Prof. (emeritus) Dr. Lars Petter Røed
Seminar Date: 
17. January 2019 - 12:30 - 13:30

Nansen Lecture based on Røed's recently published book by Springer titled: “Atmosphere and Ocean on Computers”.

Applications of operational oceanography product to fisheries management and operation

Speaker: 
Dr. Hiromichi Igarashi
Affiliation: 
JAMSTEC, Yokohama, Japan
Seminar Date: 
3. December 2018 - 12:30 - 13:10

Operational oceanography products, reanalysis, NRT analysis and forecast ocean state, can provide us a variety of value-added information useful for fishery stock management, monitoring and efficient fishery operation. In this talk, applications of the operational products to the operational fisheries in the North Pacific conducted by JAMSTEC data synthesis research group will be presented.

A Nested-Grid Snow Modeling System

Speaker: 
Dr. Glen E. Liston
Affiliation: 
Colorado State University
Seminar Date: 
14. November 2018 - 11:00 - 12:45

Over the last 35 years, Dr. Liston has developed a snow-evolution modeling system (MicroMet, SnowModel, and SnowAssim) that can be used for a wide range of snow and other cold-season, cold-region applications. The model formulation is general enough to allow simulations over temporal domains spanning days to decades, and spatial domains spanning from local measurement sites to pan-Arctic regions at spatial resolutions ranging from 1-m to 10-km.

Responsible Research and Innovation - why should we start thinking about it?

Speaker: 
Dorothy Dankel
Affiliation: 
University of Bergen
Seminar Date: 
23. October 2018 - 12:30 - 13:30

This 2-part presentation starts with an easy intro to Responsible Research and Innovation (RRI) and putting RRI in the context of NFR and Horizon2020 proposal writing (30 min) followed by discussion Q/A and RRI exercises for moe in-depth exposure.

CIMR: the Passive Microwave Satellite Mission for Copernicus.

Speaker: 
Thomas Lavergne,
Affiliation: 
MET Norway
Seminar Date: 
31. October 2018 - 12:30 - 13:10

EU is currently planning the future of its fleet of Earth Observation missions: the Sentinels. To serve the EU integrated Arctic policy from 2025, several candidate missions are under study. One of the candidate, the Copernicus Imaging Microwave Radiometer (CIMR) is an advanced Passive Microwave Radiometer mission, improving on the now 40 years capability of SMMR, SSM/I(S), and AMSRs. The two primary objectives of CIMR are all-weather, high-resolution, high-accuracy, sub-daily observations of sea-ice concentration (SIC), and sea-surface temperature (SST).

Crossing the Southern Ocean: How the parameterization of poleward heat transport may differ from that of the real world

Speaker: 
Matthew Hecht
Affiliation: 
LANL, USA
Seminar Date: 
22. October 2018 - 12:30 - 13:10

As the only major ocean basin that allows for circumpolar flow, with no continental boundaries against which zonal pressure gradients may be established, the Southern Ocean has been singled out as a region in which transient mesoscale eddies are especially important. When effects of bathymetry on the flow are considered, however, transient eddies alone need not generate the entire poleward heat transport that compensates the equatorward heat transport forced by the prevailing westerly winds.

Cross shelf dynamics in the Agulhas Current region from GlobCurrent and glider observations

Speaker: 
Tumelo Maja
Affiliation: 
Nansen-Tutu, University of Cape Town, South Africa and Council for Scientific and Industrial Research
Seminar Date: 
27. September 2018 - 12:30 - 13:00

The Agulhas Current is the strongest western boundary current in the southern hemisphere and a major driver of variability for coastal regions along South Africa’s eastern shores. Interactions between the Agulhas Current and the steep and narrow continental shelf drive a range of instabilities at the meso (50 – 200 km) and sub-meso (<10 km) scales, such as the shedding of eddies, plumes and filaments, as well as the meandering or intrusion of the current onto the shelf (Krug et al., 2017).

Simultaneous ensemble-based state and parameter estimation for earth systems

Speaker: 
Fuqing Zhang
Affiliation: 
Pennsylvania State University
Seminar Date: 
28. September 2018 - 11:00 - 12:00

We seek to develop and apply a generalized data assimilation framework using Ensemble-based Simultaneous State and Parameter Estimation (ESSPE) that will facilitate data-model integration and uncertainty quantification for the broad weather, climate and earth science communities.

Using the Ensemble Kalman Filter to estimate turbulence model parameters: Intermediate results

Speaker: 
Simon Clement
Seminar Date: 
5. September 2018 - 12:30 - 13:00

Our ultimate goal is to compute the contextual model evidence in a 1D energy- length-scale turbulence closure model, and to use this model evidence to perform model selection.
In particular, contextual model evidence would be used to estimate parameters of the turbulence-closure and more generally to select the best parametrisation of the turbulence.
We use the EnKF-N to perform state estimation, and test its performance first by using a twin experiments setup with synthetic observations.

Optimization of stochastic parameterizations for model error treatment using nested ensemble Kalman filters

Speaker: 
Guillermo Scheffler
Affiliation: 
University of Buenos Aires, Argentina
Seminar Date: 
16. August 2018 - 12:30 - 13:00

Stochastic parameterizations have been successfully used to represent the uncertainty associated with the parameterization of unresolved scale processes for ensemble forecasting and data assimilation systems. In order to accurately describe the uncertainty associated with numerical predictions, these parameterizations have to be optimized. We will introduce a novel technique based on hierarchical ensemble Kalman filters for the optimization of stochastic parameterizations for data assimilation applications.

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