How to obtain ocean turbulent dynamics at super resolution from optimal multiresolution analysis and multiplicative cascade?

Joël Sudre (1) , Hussein Yahia (2) , Oriol Pont (2) , Veronique Garcon (1)

1 LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales
2 GeoStat - Geometry and Statistics in acquisition data

A fundamental challenge in oceanography is the synoptic determination of ocean circulation using the data acquired from space, with a coherent depiction of its turbulent characteristics. This determination has the potential of revealing all aspects of the ocean dynamic variability on a wide range of spatio-temporal scales and will enhance our understanding of ocean–atmosphere exchanges at super resolution, as required in the present context of climate change. A method to obtain ocean dynamics products at different super resolutions is presented here, using an approximation of the energy cascade, expressed in a microcanonical formulation, and associated to turbulent signals provided by different products of Sea Surface Temperature (SST). The basics idea is to propagate across the scales motion information at lower resolution coming from GEKCO product [Sudre et al., 2013] in a multiresolution analysis computed on adimensional critical transition informations [Su-dre et al., 2015]. REFERENCES Sudre J., Maes C., and Garc ̧on V., 2013, On the global estimates of geostrophic and Ekman surface currents, Limnology and Oceanography: Fluids and Environments, vol. 3, pp. 1–20, DOI 10.1215/21573689-2071927. Sudre J., Yahia H., Pont O. and Garc ̧on V., 2015, Ocean turbulent dynamics at Superresolution from optimal multiresolution analysis and multiplicative cascade, IEEE transaction on geoscience and remote sensing, vol. 53, NO. 11, DOI 10.1109/TGRS.2015.2436431.

Mots clés: Super-resolution reconstruction; wavelets; submesoscale; ocean dynamics; remote sensing; nonliner signal processing

Domaines: Traitement du signal et de l'image [eess.SP]; Océan, Atmosphère

Joël Sudre, Hussein Yahia, Oriol Pont, Veronique Garcon. How to obtain ocean turbulent dynamics at super resolution from optimal multiresolution analysis and multiplicative cascade?. Submesoscale Processes: Mechanisms, Implications and new Frontiers, May 2016, Liege, Belgium. , 2016, University of Liege Colloqium. ⟨hal-01354909⟩