A5052137137- Meteorological Phenomena and Simulations
- Climate variability and models
- Fluid Dynamics and Turbulent Flows
- Tropical and Extratropical Cyclones Research
- Geomagnetism and Paleomagnetism Studies
- Oceanographic and Atmospheric Processes
- Wind and Air Flow Studies
- Atmospheric aerosols and clouds
- Solar and Space Plasma Dynamics
- Plant Water Relations and Carbon Dynamics
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- RNA Interference and Gene Delivery
- Advanced biosensing and bioanalysis techniques
- RNA and protein synthesis mechanisms
- Geology and Paleoclimatology Research
- Advanced Thermodynamics and Statistical Mechanics
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Complex Systems and Time Series Analysis
- Ocean Waves and Remote Sensing
- Computational Fluid Dynamics and Aerodynamics
- Advancements in Photolithography Techniques
- Fluid Dynamics and Vibration Analysis
- Atmospheric Ozone and Climate
Météo-France
2016-2025
Centre National de la Recherche Scientifique
2015-2024
Centre National de Recherches Météorologiques
2007-2024
University of Warsaw
2023-2024
Institute of Geophysics
2024
Nippon Shinyaku (Japan)
1987-2023
National Institute for Laser Plasma and Radiation Physics
2013
Met Office
2013
Ludwig-Maximilians-Universität München
2013
Institut National des Sciences Appliquées de Toulouse
2011
The last decade has seen the success of stochastic parameterizations in short-term, medium-range and seasonal forecasts: operational weather centers now routinely use parameterization schemes to better represent model inadequacy improve quantification forecast uncertainty. Developed initially for numerical prediction, inclusion not only provides estimates uncertainty, but it is also extremely promising reducing longstanding climate biases relevant determining response external forcing. This...
Abstract Entrainment and detrainment processes have been recognised for a long time as key cumulus convection recently witnessed regrowth of interest mainly due to the capability large‐eddy simulations (LES) diagnose these in more detail. This article has twofold purpose. Firstly, it provides historical overview past research on mixing processes, secondly, highlights recent important developments. These include both fundamental process studies using LES aiming improve our understanding...
Abstract After extensive efforts over the course of a decade, convective-scale weather forecasts with horizontal grid spacings 1–5 km are now operational at national services around world, accompanied by ensemble prediction systems (EPSs). However, though already operational, capacity for this scale is still to be fully exploited overcoming fundamental difficulty in prediction: three-dimensional and turbulent nature atmosphere. The totally different from that synoptic (10 3 km), slowly...
Abstract For decades, enhancement of ice concentrations above those active nucleus aerosols was observed in deep clouds with tops too warm for homogeneous freezing, indicating fragmentation (multiplication). Several possible mechanisms have been suggested from laboratory studies, and one these involves ice–ice collisions. In this two-part paper, the role breakup collisions a convective storm consisting many cloud types is assessed modeling approach. The colliding particles can belong to any...
The time–frequency spectral structure of El Niño–Southern Oscillation (ENSO) time series holds much information about the physical dynamics ENSO system. authors have analyzed changes spectrum with three indices: conventional Southern index (SOI), Niño3 sea surface temperatures, and a tropical Pacific rain index, over period 1871–1995. Three methods analysis—windowed Fourier transform, wavelet analysis, windowed Prony's method—were used, results are in good agreement. spectra all show strong...
The Wind-Induced Sea–Air Heat Exchange (WISHE) Model of the 30–60-day oscillation developed by Emanuel is improved adding downdrafts to representation convection and coupling troposphere a passive stratosphere into which equatorial waves may propagate. are associated with precipitation efficiency that less than unity; this means not all adiabatic cooling due ascent in wave disturbance can be countered condensation heating, therefore "feels" stable stratification as work Neelin et al. As...
Abstract Ice in atmospheric clouds undergoes complex physical processes, interacting especially with radiation, which leads to serious impacts on global climate. After their primary production, ice crystals multiply extensively by secondary processes. Here, it is shown that a mostly overlooked process of mechanical breakup particles ice–ice collisions contributes such observed multiplication. A regime for explosive multiplication identified its phase space efficiency and number concentration...
Abstract In Part I of this two-part paper, a formulation was developed to treat fragmentation in ice–ice collisions. the present II, is implemented two microphysically advanced cloud models simulating convective line observed over U.S. high plains. One model 2D with spectral bin microphysics scheme. The other has hybrid bin–two-moment bulk scheme 3D. case consists cumulonimbus cells cold bases (near 0°C) dry troposphere. Only breakup included simulation are aircraft observations particles...
Abstract. A general formulation for the distribution problem is presented, which applicable to frequency distributions of subgrid-scale variables, hydrometeor size distributions, as well probability characterizing data uncertainties. The presented based upon two well-known basic principles: maximum-entropy principle and Liouville equation. defines most likely form, if necessary constraints are specified. This paper proposes specify these output variables be used in a host model. Once form...
Abstract. Closure is a problem of defining the convective intensity in given parameterization. In spite many years efforts and progress, it still considered an overall unresolved problem. The present article reviews this from phenomenological perspectives. physical variables that may contribute are listed, their statistical significances identified by observational data analyses reviewed. A possibility discussed for identifying correct closure hypothesis performing linear stability analysis...
An asymptotic theory of marginal thermal convection in rotating systems is constructed for the limit rapid rotation. Many self-gravitating astronomical bodies, including major planets, Sun, and Earth's liquid core, correspond to this limit. In laboratory, an analogous system can be with a very rapidly apparatus, which centrifugal force plays role self-gravitation. The formulation offered such way that both these geophysical laboratory analogues are included as special cases. When inclination...
Abstract A simple self‐contained theory is proposed for describing the life cycles of convective systems as a discharge–recharge process. closed description derived dynamics an ensemble plumes based on energy cycle. The system consists prognostic equations cloud work function and kinetic energy. can be by introducing functional relationship between cloud‐base mass flux. behaviour this considered under bulk simplification. Previous cloud‐resolving models well statistical theories suggest that...
Mechanical break‐up in ice–ice collisions observed the laboratory can lead to explosive ice multiplication. The possibility is examined detail by constructing an idealized analytical single‐point (zero‐dimension) model assuming spatial homogeneity within a cloud. rate of generation primary fixed at constant value over time, corresponding situation which relative humidity (at water saturation as for mixed‐phase cloud) and updraught speed are fixed. This would further imply infinite supply...
Structure of the mass-flux convection parameterization formulation is re-examined. Many equations associated with this are derived in systematic manner various intermediate steps explicitly presented. The nonhydrostatic anelastic model (NAM) taken as a starting point all derivations. Segmentally constant approximation (SCA) basic geometrical constraint imposed on full system (e.g., NAM) first step for deriving formulation. standard parameterization, originally formulated by Ooyama,...
This paper considers interactions between the moist atmospheric convection and large-scale flow driven by gradient of sea surface temperature. A two-dimensional computational framework is used with horizontal domain size 4000 km in which both convective dynamics are resolved. Rotational effects not considered. Simulations performed using either a prescribed temperature tendency mimicking radiative processes or fully interactive radiation transfer model. The simulations for period 60 days...
Abstract A systematic scale analysis is performed for large-scale dynamics over the tropics. It identified that two regimes are competing: 1) a characterized by balance between vertical advection term and diabatic heating in thermodynamic equation, realized at horizontal scales less than L ∼ 103 km given velocity U 10 m s−1, 2) linear equatorial wave modulated convective heating, larger 3 × s−1. Under first dynamic regime (balanced), system may be approximated as nondivergent to leading...
Abstract Atmospheric convection has a tendency to organize on hierarchy of scales ranging from the mesoscale planetary scales, with latter especially manifested by Madden–Julian oscillation. The present paper examines two major competing mechanisms self-organization in cloud-resolving model (CRM) simulation phenomenological thermodynamic point view. first mechanism is self-organized criticality. A saturation precipitation rate increasing column-integrated water, reminiscent critical...
Abstract The Madden–Julian oscillation (MJO), a planetary-scale eastward-propagating coherent structure with periods of 30–60 days, is prominent manifestation intraseasonal variability in the tropical atmosphere. It widely presumed that small-scale moist cumulus convection critical part its dynamics. However, recent results from high-resolution modeling as well data analysis suggest MJO may be understood by dry dynamics to leading-order approximation. Simple, further theoretical...
Abstract. This paper presents a review of large number research studies performed during the last few decades that focused on investigation cold season extreme precipitation events (EPEs) in Mediterranean region (MR). The publications demonstrate important role anomalously intense transports moist air from tropical and subtropical Atlantic occurrence EPEs MR. MR are directly or indirectly connected to narrow bands with high concentration moisture lower troposphere, i.e., atmospheric rivers,...
Recent observations have revealed an hierarchy of cloud clusters and superclusters within the Madden-Julian oscillation equatorial troposphere. The authors here report on results simulations with a model based simple nonlinear analog shallow-water equations. consists troposphere represented by single values vertical velocity temperature in which horizontal motions are assumed always to represent first baroclinic mode. overlies subcloud layer fixed depth evolution moist entropy is predicted....
Evidence is presented that the tropical convective variability behaves as 1/f noise for a 1–30-day period. This behavior shown by analyzing time series of available potential energy, which measures degree instability, well boundary layer moisture and temperature 4-month period over western Pacific during Tropical Ocean Global Atmosphere Coupled Ocean–Atmosphere Response Experiment. The long memory associated with has important implications global climate modeling, particularly ENSO...
Abstract This study discusses the 1 /f ‐noise behaviour and its connection with pulse‐like events in tropical surface meteorological data. The noise, f being frequency, refers to unique spectrum shape of signals that represents same degree variability for a whole range very long lag‐correlations. are characterized by their high localizations time lack distinct peak. Approximate is found temperature, moisture, wind speed periods hour beyond 10 days oceanic stress up 2‐year periods. origin...