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RISA Three-Dimensional Simulation of a Tropical Squall Line: Convective Organization and Thermodynamic Vertical Transport
Publisher: American Meteorological Society
Abstract: Three-dimensional convective-scale simulations of an African squall line, observed during the French COPT 81 experiment, are presented. Three simulations with different representations of large-scale forcing are performed ...
The Initiation and Horizontal Scale Selection of Convection over Gently Sloping Terrain
Publisher: American Meteorological Society
Abstract: Two- and three-dimensional numerical simulations were performed to investigate the scale selection and initiation of both moist and dry convection over gentle western and gentle eastern slopes where the latter represents ...
Dynamic Role of a Westerly Wind Burst in Triggering an Equatorial Pacific Warm Event
Publisher: American Meteorological Society
Abstract: Dynamical impacts of a strong westerly wind burst (WWB) are studied using an ocean?atmosphere coupled simulation in which an intense westerly wind burst is introduced. The ocean response includes local and remote components ...
A Parameterization of Mesoscale Enhancement of Surface Fluxes for Large-Scale Models
Publisher: American Meteorological Society
Abstract: The paper investigates the enhancement of surface fluxes by atmospheric mesoscale motions. The authors show that horizontal wind variabilities induced by these motions (i.e., gustiness) need to be considered in the ...
Comparison between a Three-Dimensional Simulation and Doppler Radar Data of a Tropical Squall Line: Transports of Mass, Momentum, Heat, and Moisture
Publisher: American Meteorological Society
Abstract: Results from a detailed three-dimensional cloud model are extensively compared with Doppler radar data in the case of a fast-moving tropical squall line, observed during the COPT81 experiment. The comparisons use a ...
An Idealized Two-Dimensional Framework to Study the West African Monsoon. Part I: Validation and Key Controlling Factors
Publisher: American Meteorological Society
Abstract: An idealized vertical?meridional zonally symmetric model is developed in order to recover a July typical monsoon regime over West Africa in response to surface conditions. The model includes a parameterization to account ...
A Tropical Squall Line Observed during TOGA COARE: Extended Comparisons between Simulations and Doppler Radar Data and the Role of Midlevel Wind Shear
Publisher: American Meteorological Society
Abstract: Results from a three-dimensional cloud model are extensively compared with airborne Doppler radar data in the case of a tropical oceanic squall line observed during the Tropical Ocean Global Atmosphere Coupled Ocean?Atmosphere ...
Wavelet-Compressed Representation of Deep Moist Convection
Publisher: American Meteorological Society
Abstract: The capacity of wavelets to effectively represent atmospheric processes under compression is tested by a dataset generated by a cloud-resolving model simulation of deep convective events observed during the Tropical Ocean ...
“Renormalization” Approach for Subgrid-Scale Representations
Publisher: American Meteorological Society
Abstract: Physical processes in numerical modeling are currently handled by a dichotomy of either an explicit or a parameterization approach. Herein, an alternative approach is proposed, in which degrading explicit physics with ...
Extratropical Dry-Air Intrusions into the West African Monsoon Midtroposphere: An Important Factor for the Convective Activity over the Sahel
Publisher: American Meteorological Society
Abstract: This paper investigates the relationship between large-scale dynamics, water vapor, and organized convection over West Africa. Making use of a simplified condensation hypothesis, a back-trajectory model fed by NCEP-analyzed ...