Previous Seminars

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).

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.

Syntool - a tool for data browsing and visualisation

Speaker: 
Tor I. Olaussen
Seminar Date: 
23. October 2018 - 11:15 - 11:45

The Syntool Arctic Portal, in short, is a satellite remote sensing visualization, comparison tool and data browser. A multitude of remote sensing data products can be imported to individual layers in Syntool. These layers can be turned on and off, making it possible to compare disparate datasets both spatially and temporally.

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.

Measuring Arctic amplification

Speaker: 
Richard Davy
Seminar Date: 
9. October 2018 - 11:15 - 11:45

One of the defining features of both recent and historical cases of global climate change is Arctic Amplification (AA). This is the more rapid change in the surface air temperature (SAT) in the Arctic compared to some wider reference region, such as the Northern Hemisphere (NH) mean. Many different metrics have been developed to quantify the degree of AA based on SAT anomalies, trends and variability. The use of different metrics, as well as the choice of dataset to use can affect conclusions about the magnitude and temporal variability of AA.

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.

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).

Satellite chl-a image inpaintin

Speaker: 
Julien Brajard
Affiliation: 
LOCEAN, Sorbonne Université, NERSC
Seminar Date: 
25. September 2018 - 12:00 - 12:30

In this work, we evaluate the efficiency of a deep-convolutional neural network (CNN) to reconstruct missing data in chlorophyll-a satellite images. The missing area are mainly due to the presence of cloud above the ocean. The CNN-based methodology is compared with a sate-of-art krigging algorithm.

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.

Greenland Ice Sheet mass balance and climate interactions

Speaker: 
Prof. Edward Hanna
Affiliation: 
School of Geography and Lincoln Centre for Water and Planetary Health, College of Science, University of Lincoln, UK
Seminar Date: 
30. August 2018 - 12:30 - 13:15

The rate of mass loss from the Greenland Ice Sheet (GrIS) has tripled over the last 20 years, reflecting strong climate warming over the region. Here I will present a review of some of the Greenland mass-balance evaluations that I have been involved with over the last 15 years. We will also review other recent estimates of GrIS mass change, including some very recent observational updates from satellite data, noting the impacts on global sea-level rise.