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Séminaire du département Images et Signal du 21/03/2019 à 14h00

 

Monitoring rapidly changing ice-sheets

Intervenant : Jeremie MOUGINOT, Institut des Géosciences de l'Environnement (IGE) Université Grenoble Alpes

Lieu : salle Chartreuse

 

Résumé : Under the current changing climate, the ice sheets in Antarctica and Greenland responded with an increase in mass loss resulting in a significant contribution to sea level rise. In order to quantify and understand these changes, it is essential to monitor the glacier dynamics. I will describe the innovative remote sensing techniques developed to better describe the dynamic of the ice sheets and highlight ongoing (significant) changes of two regions far apart from each other: North-Eastern Greenland and the Amundsen Sea Embayment in Antarctica. Both regions have encountered ice shelf weakening, retreat of the grounding line, acceleration of the ice streams, and finally sustained increase in mass loss than can be attributed to either the direct or indirect effects of the surrounding warm oceans.‬‬‬ In light of the existing observations, it seems unlikely that the current changes will stop, or even attenuate, in a near future. I conclude on the needs for continuous dense monitoring of the changing ice sheets with the current and future remote sensing missions and the development of dedicated numerical tools to analyze the large inputs of data.


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