S. Fromang
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View article: Instability and vertical eccentricity variation in global hydrodynamic disk simulations
Instability and vertical eccentricity variation in global hydrodynamic disk simulations Open
Many dynamical interactions can induce eccentricities in astrophysical accretion disks. Disk eccentricities in turn seed a variety of instabilities, even in ideal hydrodynamics. We use 3D nonlinear simulations and 2+1D linear calculations …
View article: AMOC sensitivity to air-sea fluxes parametrization
AMOC sensitivity to air-sea fluxes parametrization Open
The Atlantic Meridional Overturning Circulation (AMOC) is a large scale circulation of about 18 Sv and 1.2 PW at 26°N characterized by upper waters flowing northward, losing heat and becoming cold deep waters before flowing back south…
View article: How Does a Dry General Circulation Model Represent Atmospheric Blocking?
How Does a Dry General Circulation Model Represent Atmospheric Blocking? Open
While dry dynamics has been a key framework for understanding blocking events, recent studies have highlighted the significant role of moist processes in blocking life cycles. However, it remains unclear whether moist processes introduce u…
View article: Understanding Tropical Cyclones in the Anthropocene: Physics, Simulations, and Attribution
Understanding Tropical Cyclones in the Anthropocene: Physics, Simulations, and Attribution Open
International audience
View article: Designing a Fully‐Tunable and Versatile TKE‐l Turbulence Parameterization for the Simulation of Stable Boundary Layers
Designing a Fully‐Tunable and Versatile TKE‐l Turbulence Parameterization for the Simulation of Stable Boundary Layers Open
This study presents the development of a so‐called Turbulent Kinetic Energy (TKE)‐l, or TKE‐l, parameterization of the diffusion coefficients for the representation of turbulent diffusion in neutral and stable conditions in large‐scale atm…
View article: Leveraging RALI‐THINICE Observations to Assess How the ICOLMDZ Model Simulates Clouds Embedded in Arctic Cyclones
Leveraging RALI‐THINICE Observations to Assess How the ICOLMDZ Model Simulates Clouds Embedded in Arctic Cyclones Open
Despite their essential role in the high‐latitude climate, the representation of mixed‐phase clouds is still a challenge for Global Climate Models (GCMs)'s cloud schemes. In this study we propose a methodology for robustly assessing Arctic…
View article: How does a dry model with the same wave energy as observation represent atmospheric blocking ?
How does a dry model with the same wave energy as observation represent atmospheric blocking ? Open
Atmospheric blockings are large-scale quasi-stationary anomalies which block the mean westerlies and can trigger extreme temperature events such as heatwaves and cold spells. While the dry dynamics theory has been a key initial framework f…
View article: Arctic cyclones and their representation in climate models
Arctic cyclones and their representation in climate models Open
Synoptic-scale Arctic cyclones are atmospheric perturbations of thousands of kilometers size associated with a low pressure that form in the Arctic or move towards this region. They live between a few days and more than a month and are cha…
View article: Designing a fully-tunable and versatile TKE-l turbulence parameterization for atmospheric models
Designing a fully-tunable and versatile TKE-l turbulence parameterization for atmospheric models Open
This study presents the development of a TKE-l parameterization of the diffusion coefficients for the representation of turbulent diffusion in neutral and stable conditions in large-scale atmospheric models. The parameterization has been c…
View article: Feedbacks between turbulent air-sea fluxes and their role in the adjustment of the Earth Climate System
Feedbacks between turbulent air-sea fluxes and their role in the adjustment of the Earth Climate System Open
In state of the art Earth System Models (ESM), the variables at the ocean-atmosphere interface (wind, air temperature, humidity, surface currents and SST) are linked to turbulent surface fluxes (momentum, sensible and latent heat) in a com…
View article: Tropical Cyclones in Global High-Resolution Simulations using the IPSL Model
Tropical Cyclones in Global High-Resolution Simulations using the IPSL Model Open
Despite many years of extensive research, the evolution of Tropical Cyclone (TC) activity in our changing climate remains uncertain. This is partly because the answer to that question relies primarily on climate simulations with horizontal…
View article: Tropical Cyclones in High-Resolution Global Climate Simulations with the IPSL Model
Tropical Cyclones in High-Resolution Global Climate Simulations with the IPSL Model Open
The availability of a new icosahedral dynamical core (DYNAMICO) for the IPSL model was the opportunity to participate in the HighResMIP protocol. We present the results of four historical 1950-2015 atmosphere-only (forced SST) simulations …
View article: How are atmospheric blockings represented in a dry general circulation model with wave energy just as powerful as in the observations?
How are atmospheric blockings represented in a dry general circulation model with wave energy just as powerful as in the observations? Open
Atmospheric blocking can be described as a large-scale stationary or quasi-stationary circulation anomaly that blocks the mean westerlies. Blocking often triggers extreme temperature events like heat waves or cold spells. However, dynamica…
View article: Intercomparison of four algorithms for detecting tropical cyclones using ERA5
Intercomparison of four algorithms for detecting tropical cyclones using ERA5 Open
The assessment of tropical cyclone (TC) statistics requires the direct, objective, and automatic detection and tracking of TCs in reanalyses and model simulations. Research groups have independently developed numerous algorithms during rec…
View article: Referee comments on egusphere-2022-179
Referee comments on egusphere-2022-179 Open
Abstract. The assessment of Tropical Cyclones (TC) statistics requires the direct, objective, and automatic detection and tracking of TCs in reanalyses and model simulations. Research groups have independently developed numerous algorithms…
View article: Intercomparison of Four Tropical Cyclones Detection Algorithms on ERA5
Intercomparison of Four Tropical Cyclones Detection Algorithms on ERA5 Open
The assessment of Tropical Cyclones (TC) statistics requires the direct, objective, and automatic detection and tracking of TCs in reanalyses and model simulations. Research groups have independently developed numerous algorithms during re…
View article: How Realistic are Tropical Cyclones in the ERA5 Reanalysis?
How Realistic are Tropical Cyclones in the ERA5 Reanalysis? Open
<p>The ERA5 dataset from the ECMWF is the first global reanalysis product to reach a horizontal resolution of 0.28125&#176; (31km), a resolution that is thought to allow for a realistic representation of small-scale atmospheric f…
View article: Tracking tropical cyclones in reanalysis and simulations: guidelines from an intercomparison of four algorithms
Tracking tropical cyclones in reanalysis and simulations: guidelines from an intercomparison of four algorithms Open
<p>The direct detection &#8212; or tracking &#8212; of tropical cyclones (TC) in gridded datasets outputs from reanalyses or model simulations is required to assess TC statistics. This issue has been tackled independently by …
View article: Radiative Rayleigh-Taylor instability and the structure of clouds in planetary atmospheres
Radiative Rayleigh-Taylor instability and the structure of clouds in planetary atmospheres Open
Aims. Clouds are expected to form in a broad range of conditions in the atmosphere of exoplanets given the variety of possible condensible species. This diversity, however, might lead to very different small-scale dynamics depending on rad…
View article: Linking Warm Arctic Winters, Rossby Waves, and Cold Spells: An Idealized Numerical Study
Linking Warm Arctic Winters, Rossby Waves, and Cold Spells: An Idealized Numerical Study Open
The changes of midlatitude Rossby waves and cold extreme temperature events (cold spells) during warm Arctic winters are analyzed using a dry three-level quasigeostrophic model on the sphere. Two long-term simulations are compared: the fir…
View article: HFQPOs and discoseismic mode excitation in eccentric, relativistic discs. II. Magnetohydrodynamic simulations.
HFQPOs and discoseismic mode excitation in eccentric, relativistic discs. II. Magnetohydrodynamic simulations. Open
Trapped inertial oscillations (r-modes) provide a promising explanation for high-frequency quasi-periodic oscillations (HFQPOs) observed in the emission from black hole X-ray binary systems. An eccentricity (or warp) can excite r-modes to …
View article: HFQPOs and discoseismic mode excitation in eccentric, relativistic discs. I. Hydrodynamic simulations
HFQPOs and discoseismic mode excitation in eccentric, relativistic discs. I. Hydrodynamic simulations Open
High-frequency quasi-periodic oscillations (HFQPOs) observed in the emission of black hole X-ray binary systems promise insight into strongly curved spacetime. ‘Discoseismic’ oscillations with frequencies set by the intrinsic properties of…
View article: The Effect of the Madden–Julian Oscillation on the North Atlantic Oscillation Using Idealized Numerical Experiments
The Effect of the Madden–Julian Oscillation on the North Atlantic Oscillation Using Idealized Numerical Experiments Open
The aim of the paper is to investigate the influence of the Madden–Julian oscillation (MJO) on the North Atlantic Oscillation (NAO) using a quasigeostrophic model on the sphere. A simplified forcing based on potential vorticity anomalies i…
View article: Idealised simulations of the deep atmosphere of hot Jupiters
Idealised simulations of the deep atmosphere of hot Jupiters Open
Context. The anomalously large radii of hot Jupiters has long been a mystery. However, by combining both theoretical arguments and 2D models, a recent study has suggested that the vertical advection of potential temperature leads to a hott…
View article: Idealised simulations of the deep atmosphere of hot jupiters: Deep, hot, adiabats as a robust solution to the radius inflation problem
Idealised simulations of the deep atmosphere of hot jupiters: Deep, hot, adiabats as a robust solution to the radius inflation problem Open
Context: The anomalously large radii of hot Jupiters has long been a mystery. However, by combining both theoretical arguments and 2D models, a recent study has suggested that the vertical advection of potential temperature leads to an adi…
View article: Thermo-compositional Diabatic Convection in the Atmospheres of Brown Dwarfs and in Earth’s Atmosphere and Oceans
Thermo-compositional Diabatic Convection in the Atmospheres of Brown Dwarfs and in Earth’s Atmosphere and Oceans Open
By generalizing the theory of convection to any type of thermal and compositional source terms (diabatic processes), we show that thermohaline convection in Earth’s oceans, fingering convection in stellar atmospheres, and moist convection …