This paper presents analyses of L1B waveforms in SAR mode and Low-Rate Mode (LRM) over water surfaces from numerical simulations from the CryoSat Mission Performance Simulator (CRYMPS) and from CryoSat-2 satellite measurements. This work was performed as part of the ESA project "Development of SAR Altimetry Studies and Applications over Ocean, Coastal zones and Inland waters (SAMOSA)". The proj...

Tropical cyclones (TCs) actively contribute to the dynamics of Earth’s coupled climate system. They influence oceanic mixing rates, upper-ocean heat content, and air–sea fluxes, with implications for atmosphere and ocean dynamics on multiple spatial and temporal scales. Using an ocean general circulation model with modified surface wind forcing, we explore how TC winds can excite equatorial oce...

Starting from the observation that an important next stage in exploiting the ocean energy is to install large arrays of several identical devices in order to raise their overall electricity production, the present work has as objective to assess the local and coastal impact of a large wave farm that would operate in the Portuguese coastal environment. The target area is the Portuguese maritime ...

The long term goal of this research is to significantly advance computational models for multi-scale flow physics in geometrically and/or hydrodynamically complex oceanic and coastal ocean environments, through refinements in the defined physics, domain definition and computational grid resolution. The particular focus is on improved coupling of spectral wave models and circulation models withi...

High-frequency (HF) radars have been used since 20 years for remotely sensing ocean surface currents and ocean waves. Backscattered Doppler spectra contain two discrete lines, the frequencies of which (Bragg frequency) determine the current speed, and four continuous side bands, which allow to apply inversion techniques for retrieving ocean wave spectra. Recently, a new HF radar has been develo...

[1] Why do ocean waves break? Understanding this important and obvious property of the ocean surface has been elusive for decades. This paper investigates causes which lead deep-water two-dimensional initially monochromatic waves to break. Individual wave steepness is found to be the single parameter which determines whether the wave will break immediately, never break or take a finite number o...

In this paper, we study bifurcation structures of period-adding phenomena in an internal wave model that is a mathematical model for ocean internal waves. It has been suggested that chaotic solutions observed in the internal wave model may be related to the universal property of the energy spectra of ocean internal waves. In numerical bifurcation analyses of the internal wave model, we illustra...

We propose a novel remote sensing technique that infers the three-dimensional wave form and radiance of oceanic sea states via a variational stereo imagery formulation. In this setting, the shape and radiance of the wave surface are minimizers of a composite cost functional which combines a data fidelity term and smoothness priors on the unknowns. The solution of a system of coupled partial dif...

New methods have been investigated which use fully polarimetric synthetic aperture radar (POLSAR) image data to measure ocean wave slopes. Independent techniques have been developed to measure wave slope spectra in both the radar azimuth and range directions. Wave spectra measured using the new methods are compared with spectra developed using conventional SAR intensity-based methods, and with ...