A5009405386- Meteorological Phenomena and Simulations
- Fluid Dynamics and Turbulent Flows
- Climate variability and models
- Tropical and Extratropical Cyclones Research
- Oceanographic and Atmospheric Processes
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Atmospheric and Environmental Gas Dynamics
- Computational Fluid Dynamics and Aerodynamics
- Wind and Air Flow Studies
- Planetary Science and Exploration
- Fluid Dynamics and Vibration Analysis
- Advanced Numerical Methods in Computational Mathematics
- Ocean Waves and Remote Sensing
- Plant Water Relations and Carbon Dynamics
- Seismic Imaging and Inversion Techniques
- Space Exploration and Technology
- Stellar, planetary, and galactic studies
- Image and Signal Denoising Methods
- Aeolian processes and effects
- Computational Physics and Python Applications
- Geomagnetism and Paleomagnetism Studies
- Methane Hydrates and Related Phenomena
- Computer Graphics and Visualization Techniques
École Polytechnique
2016-2025
Centre National de la Recherche Scientifique
2010-2025
École Normale Supérieure - PSL
2002-2025
Laboratoire de Météorologie Dynamique
2014-2025
Sorbonne Université
2018-2025
Université Paris Sciences et Lettres
2021-2025
Institut Pierre-Simon Laplace
2008-2019
Université Paris-Saclay
2016
École Normale Supérieure
2002
Danbury Hospital
1993
Abstract It is the purpose of this paper to provide a comprehensive documentation new NCAR (National Center for Atmospheric Research) version spectral element (SE) dynamical core as part Community Earth System Model (CESM2.0) release. This differs from previous releases SE in several ways. Most notably hybrid sigma vertical coordinate based on dry air mass, condensates are dynamically active thermodynamic and momentum equations (also referred condensate loading), continuous motion conserve...
Abstract. The design of the icosahedral dynamical core DYNAMICO is presented. solves multi-layer rotating shallow-water equations, a compressible variant same equivalent to discretization hydrostatic primitive equations in Lagrangian vertical coordinate, and hybrid mass-based coordinate. common Hamiltonian structure these sets exploited formulate energy-conserving spatial discretizations unified way. horizontal mesh quasi-uniform C-grid obtained by subdivision regular icosahedron. Control...
Context. The anomalously large radii of hot Jupiters has long been a mystery. However, by combining both theoretical arguments and 2D models, recent study suggested that the vertical advection potential temperature leads to hotter adiabatic profile in deep atmosphere than obtained with standard 1D models. Aims. In order confirm viability scenario, we extend this investigation 3D, time-dependent Methods. We use 3D general circulation model DYNAMICO perform series calculations designed explore...
The static energy encodes all possible information about the thermodynamics and potential (and related forces) of stratified geophysical fluids. In this paper, we develop a systematic methodology, called asymptotics, that exploits property for constructing energetically thermodynamically consistent sound-proof approximations equations motion. By approximating to various orders accuracy, two main families are (re-)derived discussed: pseudo-incompressible (PI) approximation anelastic (AN)...
Shallow‐atmosphere equations retaining both the vertical and horizontal components of Coriolis force (the latter being neglected in traditional approximation) are obtained. The derivation invokes Hamilton's principle least action with an approximate Lagrangian capturing small increase height solid‐body velocity due to planetary rotation. conservation energy, angular momentum Ertel's potential vorticity ensured quasi‐ non‐hydrostatic systems.
Abstract This paper provides a comprehensive derivation of the total energy equations for atmospheric components Earth System Models (ESMs). The assumptions and approximations made in this are motivated discussed. In particular, it is emphasized that closing budget conceptually challenging hard to achieve practice without resorting ad hoc fixers. As concrete example, terms diagnosed realistic climate simulation using global atmosphere model. largest errors example spurious dynamical core...
Abstract This paper presents a self‐contained derivation, from first principles, of convective vertical mixing scheme based on the Eddy‐Diffusivity Mass‐Flux (EDMF) approach. type closure separates turbulent fluxes into two components: an eddy‐diffusivity (ED) which accounts for local small‐scale in nearly isotropic environment, and mass‐flux (MF) transport term, represents non‐local driven by vertically coherent plumes. Using multi‐fluid averaging underlying MF concept, we review consistent...
Abstract Observations of water stable isotopes in Antarctic surface snow, precipitation and vapor are key for improving our understanding the atmospheric cycle past climate reconstructions from ice cores. In this study, we use isotopic observations Antarctica to assess skill isotope‐enabled general circulation model LMDZ6, nudged ERA5 above boundary layer (1980–2023 period). The has no significant bias time‐mean temperature snow accumulation over sheet. Sensitivity test on parameterized...
Abstract Consistent shallow-water equations are derived on the rotating sphere with topography retaining Coriolis force due to horizontal component of planetary angular velocity. Unlike traditional approximation, this ‘non-traditional’ approximation captures increase height solid-body velocity rotation. The conservation energy, momentum and potential vorticity ensured in system. caveats extending standard wisdom case exposed. Different derivations model possible, being based, respectively,...
Abstract. A new algorithm is presented for the solution of shallow water equations on quasi-uniform spherical grids. It combines a mimetic finite volume spatial discretization with Crank–Nicolson time fast waves and an accurate conservative forward-in-time advection scheme mass potential vorticity (PV). The implemented tested two families grids: hexagonal–icosahedral Voronoi grids, modified equiangular cubed-sphere Results variety tests are presented, including convergence discrete scalar...
Abstract A regional climate model (RCM) is driven by the ERA‐40 reanalyses produced ECMWF general circulation (GCM) to simulate winter 1998 over Mediterranean basin. In this article, we consider effects on internal variability of temporal nudging. This technique consists relaxing RCM's prognostic variables towards GCM values within a predetermined time‐scale, with aim disallowing large and unrealistic departures between driving fields. To interpret significant effect time nudging prediction,...
Abstract Spectral nudging is a technique consisting in driving regional climate models (RCMs) on selected spatial scales corresponding to those produced by the global circulation model (GCM). This prevents large and unrealistic departures between GCM fields RCM at scales. Theoretically, relaxation of towards should be infinitely strong provided thre are perfect large‐scale fields. In practice, time chosen based trial error. this study, physical parameters setting optimal coefficient...
A specific instability of vortices is found in rotating shallow water equations with horizontal density/temperature gradients, which used for modelling atmospheric and oceanic mixed layers. The model re-interpreted as dynamics non-isentropic two-dimensional gas. instability, was not reported previously, develops a way suggesting its convective character. It appears when anomaly buoyancy at the center vortex vorticity have opposite signs (for positive Coriolis parameters), coexists standard...
Abstract Sea/land breezes and inland have in common the ‘breeze’ appellation but are essentially different. The land/sea‐breeze horizontal extent exceeds 100 km, with Coriolis effect dominating its dynamics. Conversely, confined between alternating patches of cold warm surface temperature, over ranges never exceeding a few kilometres, negligible effect. Both inland‐breeze systems embedded within planetary boundary layer. Despite their superficial resemblance, however, physics differs this...
Abstract In this work, we consider the effect of indiscriminate nudging time on an idealized high‐resolution global model (GM) and limited‐area (LAM) simulations. The used is a two‐layer quasi‐geostrophic beta‐plane. studied as function predictability time, following ‘Big Brother’ experimental approach: ‘global’ to generate ‘reference run’. These fields are filtered afterwards remove small scales provide coarse‐resolution which drive GM LAM. Comparison reference runs over same region allows...
Abstract This article presents the first dynamically adaptive wavelet method for shallow‐water equations (SWEs) on a staggered hexagonal C‐grid. Pressure is located at centres of primal grid (hexagons) and velocity edges dual (triangles). Distinct bi‐orthogonal second‐generation transforms are developed pressure velocity. These based second‐order accurate interpolation restriction operators. Together with compatible operators mass flux Bernoulli function, they ensure that conserved there no...
Abstract The usual geophysical approximations are reframed within a variational framework. Starting from the Lagrangian of fully compressible Euler equations expressed in general curvilinear coordinates system, Hamilton’s principle least action yields Euler–Lagrange motion. Instead directly making these equations, approach followed is that asymptotics; is, all performed Lagrangian. Using coordinate system where geopotential third coordinate, diverse considered. assumptions and covered 1)...
Abstract The curl form of equations inviscid atmospheric motion in general non-Eulerian coordinates is obtained. Narrowing down to a vertical coordinate, quasi-Hamiltonian then obtained Lagrangian, isentropic, mass-based or z-based coordinate. In non-Lagrangian coordinates, the conservation energy by transport terms results from invariance under relabeling fluid parcels. A complete partial separation between horizontal and dynamics achieved, except Eulerian case. horizontal–vertical...