Recent  

Glacial isostatic adjustment is the delayed reaction of the Earth's lithosphere and mantle to changing mass load of ice sheets or water. The deformation behavior of the Earth's surface depends on the ability of the Earth's mantle to flow, i.e. its viscosity. It can be estimated from sea level observations. In our study we simulate using sea level observations from the past to estimate mantle viscosity. That knowledge is essential for understanding current sea level changes due to melting ice.

When the internal solitary wave propagates to the continental shelf and slope, the polarity reverses due to the shallower water depth. In this process, the internal solitary wave dissipates energy and enhances diapycnal mixing, thus affecting the local oceanic environment. In this study, we used reflection seismic data to evaluate the spatial distribution of the diapycnal mixing around the polarity-reversing internal solitary waves.

Present climate model discuss climate change, but show no sign of bifurcation in the future. Is this because there is none, or because they are by essence too simplified to be able to capture them? To get elements of answer, we ran a laboratory experiments, and discovered that the answer is not so simple.

Our regional numerical weather prediction models run at kilometer scale resolutions. Processes that occur at smaller scales are not resolved, yet significantly contribute to the atmospheric flow. We use a neural network (NN) to represent the unresolved part of physical process such as cumulus clouds. We test this approach on simplified, yet representative 1D model and find that the NN corrections vastly improve the model forecast up to a couple of days.

Forecasting the height of new snow is essential for avalanche hazard survey, road and ski resort management, tourism attractiveness, etc. Meteo-France operates a probabilistic forecasting system using a Numerical Weather Prediction system, and a snowpack model. It provides better forecasts than direct diagnostics but exhibits significant biases. Post-processing methods can be applied to provide automatic forecasting products from this system.

According to synthetic aperture radar images, bidirectional rank-ordered internal solitary waves (ISWs) are visible in the channel lying between Car Nicobar Island and Batti Malv Island. In order to explore the generation and evolution of these ISWs, numerical simulations were performed. The generation mechanism and its variable factors were discussed. The asymmetrical feature of bidirectional of ISWs highlights the effect of topographic structure in simulation research of ISW.