A5089040188- Climate variability and models
- Meteorological Phenomena and Simulations
- Tropical and Extratropical Cyclones Research
- Oceanographic and Atmospheric Processes
- Atmospheric aerosols and clouds
- Ocean Waves and Remote Sensing
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Atmospheric chemistry and aerosols
- Geological and Geophysical Studies
- Precipitation Measurement and Analysis
- Marine and coastal ecosystems
- Solar and Space Plasma Dynamics
- Fluid Dynamics and Turbulent Flows
- Methane Hydrates and Related Phenomena
- Model Reduction and Neural Networks
- Atmospheric Ozone and Climate
- Climate change impacts on agriculture
- Tree-ring climate responses
- Urban Heat Island Mitigation
- Agricultural Economics and Policy
- Climate Change Policy and Economics
- Geological formations and processes
- Aquatic and Environmental Studies
Institute of Science and Technology Austria
2021-2025
École Normale Supérieure de Lyon
2024
Laboratoire de Météorologie Dynamique
2017-2023
École Normale Supérieure - PSL
2017-2023
Université Paris Sciences et Lettres
2018-2023
Centre National de la Recherche Scientifique
2013-2023
Institut Pierre-Simon Laplace
2018-2023
Sorbonne Université
2018-2023
École Polytechnique
2013-2023
National Council for Scientific Research
2023
Abstract In models of radiative–convective equilibrium it is known that convection can spontaneously aggregate into one single localized moist region if the domain large enough. The changes in mean climate state and radiative fluxes accompanying this self-aggregation raise questions as to what simulations at lower resolutions with parameterized convection, similar homogeneous geometries, should be expected produce considered successful mimicking a cloud-resolving model. authors investigate...
The factors governing the rate of change in amount atmospheric water vapor are analyzed simulations climate change. global-mean is estimated to increase at a differential 7.3% K − 1 with respect surface air temperature multi-model mean. Larger rates result if fractional evaluated over finite (e.g., 8.2% for 3 warming), and zonal-mean column range from 6 12% depending on latitude.
Abstract The organization of convection is ubiquitous, but its physical understanding remains limited. One particular type the spatial self‐aggregation convection, taking form cloud clusters, or tropical cyclones in presence rotation. We show that several processes can give rise to and highlight key features responsible for it, using idealized simulations. Longwave radiative feedbacks yield a “radiative aggregation.” In case, sufficient variability cooling rates yields low‐level circulation,...
Abstract A cloud-resolving model is used to investigate the effect of warming on high percentiles precipitation (precipitation extremes) in idealized setting radiative-convective equilibrium. While this does not allow for several factors that influence tropics, it an evaluation response extremes simulations with resolved rather than parameterized convection. The methodology developed should also be applicable less simulations. Modeled are found increase magnitude sea surface temperature. dry...
In this study we investigate the scaling of precipitation extremes with temperature in Mediterranean region by assessing against observations present day and future regional climate simulations performed frame HyMeX MED-CORDEX programs. Over 1979–2008 period, despite differences quantitative simulation across various models, change respect to is robust consistent. The spatial variability temperature–precipitation relationship displays a hook shape Mediterranean, negative slope at high...
Abstract Expected changes to future extreme precipitation remain a key uncertainty associated with anthropogenic climate change. Extreme has been proposed scale the precipitable water content in atmosphere. Assuming constant relative humidity, this implies an increase of extremes at rate about 7% °C −1 globally as indicated by Clausius‐Clapeyron relationship. Increases faster and slower than have also reported. In work, we examine scaling between temperature present using simulations...
Idealized simulations of the tropical atmosphere have predicted that clouds can spontaneously clump together in space, despite perfectly homogeneous settings. This phenomenon has been called self-aggregation, and it results a state where moist cloudy region with intense deep convectivestorms is surrounded by extremely dry subsiding air devoid clouds. We review here main findings from theoretical work idealized models this phenomenon, highlighting physical processes believed to play key role...
Tropical precipitation extremes and their changes with surface warming are investigated using global storm resolving simulations high-resolution observations. The demonstrate that the mesoscale organization of convection, a process cannot be physically represented by conventional climate models, is important for variations tropical daily accumulated extremes. In both observations, increase in more organized state, association larger, but less frequent, storms. Repeating warmer results robust...
Several observational studies have shown a tight relationship between tropical precipitation and column‐integrated water vapor. We show that the observed in tropics vapor, precipitation, its variance can be qualitatively reproduced by simple physically motivated two‐layer model. It has previously been argued features of this could explained analogy with theory continuous phase transitions. Instead, our model explicitly assumes onset is governed stability threshold involving boundary‐layer...
Abstract Pools of air cooled by partial rain evaporation span up to several hundreds kilometers in nature and typically last less than 1 day, ultimately losing their identity the large-scale flow. These fundamentally differ character from radiatively-driven dry pools defining convective aggregation. Advancement remote sensing computer capabilities has promoted exploration how precipitation-induced cold pool processes modify spectrum life cycle. This contribution surveys current understanding...
Idealized simulations of tropical moist convection have revealed that clouds can spontaneously clump together in a process called self-aggregation. This results state where cloudy region with intense deep is surrounded by extremely dry subsiding air devoid convection. Because the idealized settings it was discovered, relevance self-aggregation to real world still debated. Here, we show feedbacks play leading-order role spontaneous genesis cyclones cloud-resolving simulations. Those...
The goal of this study is to understand the mechanisms controlling isotopic composition water vapor near surface tropical oceans, at scale about a hundred kilometers and month. In tropics, it has long been observed that compositions rain are more depleted when precipitation rate high. This called "amount effect." Previous studies, based on observations or models with parameterized convection, have highlighted roles deep convective mesoscale downdrafts evaporation. But relative importance...
Abstract This paper reviews recent important advances in our understanding of the response precipitation extremes to warming from theory and idealized cloud-resolving simulations. A theoretical scaling for has been proposed refined past decades, allowing address separately contributions thermodynamics, dynamics microphysics. Theoretical constraints, as well remaining uncertainties, associated with each these three extremes, are discussed. Notably, although leading order seem follow...
[1] Internal tide driven mixing plays a key role in sustaining the deep ocean stratification and meridional overturning circulation. tides can be generated by topographic horizontal scales ranging from hundreds of meters to tens kilometers. State art products barely resolve smaller than ∼10 km ocean. On these abyssal hills dominate floor roughness. The impact hill roughness on internal-tide generation is evaluated this study. conversion M2 barotropic baroclinic tidal energy calculated based...
Abstract In this study the response of tropical precipitation extremes to warming in organized convection is examined using a cloud-resolving model. Vertical shear imposed organize into squall lines. Earlier studies show that disorganized convection, fractional increase similar surface water vapor, which substantially smaller than column vapor. It has been suggested could lead stronger amplifications. Regardless strength shear, amplifications simulations are comparable those vapor and less...
Abstract The Mediterranean region is experiencing pronounced aridification and in certain areas higher occurrence of intense precipitation. In this work, we analyze the evolution precipitation probability distribution terms precipitating days (or “wet‐days”) all‐days quantile trends, Europe Mediterranean, using ERA5 reanalysis. Looking at form wet‐days trends curves, identify four regimes. Two are predominant: most northern quantiles all intensify, while low‐medium mostly decreasing as...
            Although cloud electrification and lightning have been studied for hundreds of years, the field still deals with many open questions [1]. One most puzzling examples is that inititation – neither mechanism by which a generates enough charge to cause nor process itself triggered are well understood. In our experiment we aim gain insight into both on scale single particle. We...
Classical models of tropical cyclone intensification often predict that cyclones will intensify to a steady-state intensity determined primarily by surface fluxes, while convection maintains the atmosphere close neutrally stable state (Emanuel et al. (2003); Emanuel (1995)). However, simulations using non-hydrostatic, high-resolution SAM model under idealized conditions (rotating radiative-convective equilibrium in doubly-periodic domain) reveal more complex evolution.While early aligns with...
This study investigates the influence of wind curl on zonal transport and vorticity a barotropic flow over topography using an idealized quasigeostrophic model. While previous research focuses how stress sets mean ridge models Southern Ocean, interplay between constant in determining remains open question. It is shown that injection through creates nonzero westward transport, even when there zero domain, which increases with curl. The existence explained qualitatively differences dynamics...