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Open AccessJournal ArticleDOI

The Meso-NH Atmospheric Simulation System. Part I: adiabatic formulation and control simulations

TLDR
The Meso-NH Atmospheric Simulation Engine as mentioned in this paper is a tool for small and meso-scale atmospheric processes, which is based on the Lipps and Hemler form of the anelastic system.
Abstract
The Meso-NH Atmospheric Simulation Sys- tem is a joint eAort of the Centre National de Recher- ches Meteorologiques and Laboratoire d'Aerologie. It comprises several elements; a numerical model able to simulate the atmospheric motions, ranging from the large meso-alpha scale down to the micro-scale, with a comprehensive physical package, a flexible file manager, an ensemble of facilities to prepare initial states, either idealized or interpolated from meteorological analyses or forecasts, a flexible post-processing and graphical facility to visualize the results, and an ensemble of interactive procedures to control these functions. Some of the distinctive features of this ensemble are the following: the model is currently based on the Lipps and Hemler form of the anelastic system, but may evolve towards a more accurate form of the equations system. In the future, it will allow for simultaneous simulation of several scales of motion, by the so-called ''interactive grid-nesting technique''. It allows for the in-line com- putation and accumulation of various terms of the budget of several quantities. It allows for the transport and diAusion of passive scalars, to be coupled with a chemical module. It uses the relatively new Fortran 90 compiler. It is tailored to be easily implemented on any UNIX machine. Meso-NH is designed as a research tool for small and meso-scale atmospheric processes. It is freely accessible to the research community, and we have tried to make it as ''user-friendly'' as possible, and as general as possible, although these two goals sometimes appear contradictory. The present paper presents a general description of the adiabatic formulation and some of the basic validation simulations. A list of the currently available physical parametrizations and ini- tialization methods is also given. A more precise description of these aspects will be provided in a further paper.

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Journal ArticleDOI

GPS zenith delay sensitivity evaluated from high-resolution numerical weather prediction simulations of the 8–9 September 2002 flash flood over southeastern France

TL;DR: In this paper, a high-resolution (2.4 km) non-hydrostatic atmospheric model (Meso-NH) is applied to the extreme flash flood event of 8-9 September 2002 in southeastern France.
Journal ArticleDOI

Impact of surface heterogeneity on a buoyancy-driven convective boundary layer in light winds

TL;DR: In this article, the authors investigated the impact of surface heterogeneity on the behavior of the atmospheric boundary layer (ABL) at a typical spatial scale of 1 km and found that the ABL strongly responds to the spatial configuration of surface heterogeneities.
Journal ArticleDOI

Perturbation of convection-permitting NWP forecasts for flash-flood ensemble forecasting

TL;DR: In this article, a perturbation method based on convection-permitting numerical weather prediction (NWP) model error statistics was developed to produce short-term precipitation ensemble forecasts from single-value meteorological forecasts.
Journal ArticleDOI

Increase of the aerosol hygroscopicity by cloud processing in a mesoscale convective system: a case study from the AMMA campaign

TL;DR: In this article, the main microphysical processes that affect the aerosols during the passage of a mesoscale convective system (MCS) over the region of Ni- amey in Niger were investigated.
Journal ArticleDOI

Vertical structure of the urban boundary layer over marseille under sea-breeze conditions

TL;DR: In this article, the UBL-ESCOMPTE program was used to document the vertical structure of the atmosphere above complex terrain, notably in Marseille, which is bordered by the Mediterranean sea and framed by numer- ous massifs.
References
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Journal ArticleDOI

Fully multidimensional flux-corrected transport algorithms for fluids

TL;DR: In this paper, the critical flux limiting stage is implemented in multidimensions without resort to time splitting, which allows the use of flux-corrected transport (FCT) techniques in multi-dimensional fluid problems for which time splitting would produce unacceptable numerical results.
Journal ArticleDOI

A Simple Parameterization of Land Surface Processes for Meteorological Models

TL;DR: In this article, a parameterization of land surface processes to be included in mesoscale and large-scale meteorological models is presented, where the number of parameters has been reduced as much as possible, while attempting to preserve the representation of the physics which controls the energy and water budgets.
Journal ArticleDOI

A Simple Boundary Condition for Unbounded Hyperbolic Flows

TL;DR: In this article, a Sommerfeld radiation condition (2.2) was proposed for problems requiring a prescribed open boundary, and two severe tests were used to demonstrate the applicability of the open boundary condition: collapsing bubble, a dynamic event which excites many different internal gravity waves.
Book ChapterDOI

Convective parameterization for mesoscale models : The Kain-Fritsch Scheme

TL;DR: The Kain-Fritsch (KF) convective parameterization scheme (CPS) is based on the same fundamental closure assumption as the Fritsch-Chappell (FC) (1980) scheme as mentioned in this paper.
Book ChapterDOI

On the distribution and continuity of water substance in atmospheric circulations

TL;DR: In this paper, the conservation and distribution of water substance in atmospheric circulations are considered within a frame of continuity principles, model air flows, and models of microphysical processes, where the simplest considerations of precipitation involve its vertical distribution in an updraft column, where condensate appears immediately as precipitation with uniform terminal fallspeed.
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