Previous Seminars

The Angola-Benguela Upwelling system: interannual and decadal variability (two talks)

Speaker: 
Marie-Lou Bachelery and Folly Serge Tomety
Affiliation: 
University of Cape Town
Seminar Date: 
26. November 2019 - 13:00 - 14:00

Title 1: Impacts and characteristics of the interannual Coastal Trapped Waves in the Angola-Benguela Upwelling System

Marie-Lou Bachelery, Serena Illig, and Mathieu Rouault

Investigating the variability and dynamics of the Beaufort Gyre from satellite observations and a high-resolution model

Speaker: 
Heather Regan (visitor to the Sea Ice Modelling group)
Affiliation: 
LOPS, Ifremer, Brest, France
Seminar Date: 
19. November 2019 - 13:15 - 13:45

Authors: Heather Regan (LOPS, Ifremer, Brest, France), in collaboration with Camille Lique and Claude Talandier (LOPS), Thomas Armitage (JPL) and Gianluca Meneghello (MIT)

Are ice shelf fronts a topographic barrier for barotropic currents?

Speaker: 
Nadine Steiger (Ocean Modeling)
Seminar Date: 
29. October 2019 - 11:15 - 11:45

Ice shelves in West Antarctica are thinning at an increasing rate due to the inflow of relatively warm Circumpolar Deep Water into the ice shelf cavities. This warm water from off the continental shelf flows southward towards the ice shelves through submarine troughs incised into the continental shelf. Observations in front of Getz Ice Shelf suggest that 90% of the volume transport and 65% of the temperature transport is linked to the barotropic component of the southward current which follows f/H-contours.

The Arctic Front and its variability in the Norwegian Sea

Speaker: 
Roshin Raj (Ocean and Sea Ice Remote Sensing)
Seminar Date: 
22. October 2019 - 11:15 - 11:45

Chasing Water: How ocean currents transport plastic and plankton around the globe

Speaker: 
Erik van Sebille
Affiliation: 
Institute for Marine and Atmospheric Research, Utrecht University, Netherlands
Seminar Date: 
21. October 2019 - 11:15

The ocean is in constant motion, with water circulating within and flowing between basins. As the water moves around, it caries heat and nutrients, as well as planktonic organisms and plastic litter around the globe.

The most natural way to study the pathways of water and the connections between ocean basins is using particle trajectories. The trajectories can come from computing of virtual floats in high-resolution ocean models.

Sparse Representation based on Dictionary Learning

Speaker: 
Ricardo Soares
Affiliation: 
NORCE Energy
Seminar Date: 
16. October 2019 - 11:15 - 11:45

This work presents the use of the Dictionary Learning method for a sparse representation of 4D seismic data. We consider a trade-off between the number of nonzero coefficients retained in the sparse data representation, the computational cost, and how well we can capture the main features of the original 4D seismic signal. K-SVD is an iterative algorithm used in Dictionary Learning that alternates between the calculation of the sparse representation vector and dictionary update. The algorithm starts with the definition of an initial dictionary (Discrete Cosine Transform, for instance).

Fresh updates from the Polar cruise to the North Pole

Speaker: 
Espen Storheim (Polar Acoustics and Oceanography)
Seminar Date: 
27. September 2019 - 10:15 - 10:45

Uncertainty of the Arctic Sea Surface Salinity: from evaluation to assimilation

Speaker: 
Jiping Xie (Ocean Modelling)
Seminar Date: 
10. September 2019 - 11:15 - 11:45

Monitoring the Arctic Sea Surface Salinity (SSS) from space is crucial to understand the global water cycle and the ocean dynamics is limited due to nonhomogeneous and sparse in situ data. Two gridded satellite SSS products have been derived from European Space Agency’s Soil Moisture and Ocean Salinity mission (SMOS). The uncertainties of these two SSS products in the Arctic are quantified against other two SSS products in the Copernicus Marine Environment Monitoring Services and other in situ datasets.

Physical and biogeochemical variability off Baja California (Mexico): insights from numerical NPZD ocean models

Speaker: 
David Rivas
Affiliation: 
CICESE
Seminar Date: 
30. August 2019 - 13:15 - 14:00

Physical-biogeochemical Nitrate-Phytoplankton-Zooplankton-Detritus (NPZD)
numerical models are used to study the variability of nutrients and
phytoplankton biomass in coastal waters off Baja California Peninsula, a
region of high socioeconomic importance located in the southern California
Current System. The focus of these analyses has been the effects of
interannual climatic anomalies. For example, the year 2006 was anomalously
warm and with low chlorophyll (Chl) levels, associated with warm phases of
El Niño-Southern Oscillation (ENSO) and the Pacific Decadal Oscillation

Classification of sea ice types on Sentinel-1 SAR data using convolutional neural networks

Speaker: 
Hugo Bolze
Affiliation: 
ENSG, France
Seminar Date: 
23. August 2019 - 13:00 - 13:45

In order to assure the security of navigation and offshore activities scientists have to predict with precision the type and the location of sea ices. Getting information about cold intensity and ocean-atmosphere dynamics of these polar regions are also motivations. The ways to describe sea ices are numerous but this article focuses only on type.