Seminario: Impact of HF Radar Data Assimilation on Surface Currents in the Ibiza Channel
Start: 30/09/2019 12:00 - End: 30/09/2019 14:00Place: Sala de Seminarios, IMEDEA
Titulo: Impact of HF Radar Data Assimilation on Surface Currents in the Ibiza Channel
Ponente: Jaime Hernandez Lasheras (SOCIB)
Resumen: High frequency radars (HFR) are a fast growing technology included in Coastal Observing systems around the world. HFR is a cost-effective technology mapping ocean surface currents and wave fields near coastal areas complementing the satellite observations that are less reliable when approaching the coast. In this work series of Observing System Experiments have been performed to evaluate the capability of a data assimilative high resolution regional model to improve the representation of surface currents in the Ibiza Channel (Western Mediterranean). The impact of high frequency radar (HFR) observations has been specifically assesed. The trade-off between different initialization methods after analysis and the employment of HFR radial raw observations, compared to total (u-v) derived currents will be discussed. Results show the capability of the system to correct surface currents in the Ibiza Channel when using data assimilation. Seven high resolution simulations will be presented and their results evaluated both from a lagrangian and an eulerian perspective. A set of 14 drifters deployed in the area during the experiment period has been used as independent data for a lagrangian validation.
Chasing Water: How ocean currents transport plastic and plankton around the globe
Erik van Sebille - Institute for Marine and Atmospheric Research, Utrecht University, Netherlands
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 either computing of virtual floats in high-resolution ocean models. In this seminar, I'll give an overview of some recent work with Lagrangian particles. I will introduce our new open-source oceanparcels.org framework. I will show applications to marine microbiology and ecology, palaeoclimatology and plastic pollution. Central to each of these studies is the question on how connected the different ocean basins are, and on what time scales water flows between the different regions of the ocean.
13/09/2019 The benefits produced by carnivores are less studied than conflicts
12/09/2019 Seminar: Impact of HF Radar Data Assimilation on Surface Currents in the Ibiza Channel
Welcome to the Mediterranean Institute for Advanced Studies (IMEDEA),
a research center jointly governed by the Spanish National Research Council (CSIC) and
the University of the Balearic Islands (UIB).