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RIS10–25-Day Intraseasonal Variability of Convection over the Sahel: A Role of the Saharan Heat Low and Midlatitudes
Publisher: American Meteorological Society
Abstract: he understanding and forecasting of persistent dry or wet periods of the West African monsoon (WAM), especially those that occur at the intraseasonal time scale, are crucial to improve food management and disaster mitigation ...
The West African Squall Line Observed on 23 June 1981 during COPT 81: Mesoscale Structure and Transports
Publisher: American Meteorological Society
Abstract: Durirg the night of 23/24 June 1981, new Korhogo, Ivory Coast, a squall line passed over the instrumented area of the COPT 81 experiment. Observations were obtained with a dual-Doppler radar system, a sounding station and ...
Nonhydrostatic Simulation of Frontogenesis in a Moist Atmosphere. Part II: Moist Potential Vorticity Budget and Wide Rainbands
Publisher: American Meteorological Society
Abstract: The different processes responsible for the occurrence of wide rainbands, as obtained by high-resolution (5-km) nonhydrostatic two-dimensional simulations of frontogenesis induced by shear, with an explicit representation ...
Nonhydrostatic Simulation of Frontogenesis in a Moist Atmosphere. Part I: General Description and Narrow Rainbands
Publisher: American Meteorological Society
Abstract: A series of experiments using a two-dimensional, nonhydrostatic, numerical cloud model with fine horizontal and vertical resolution is performed with the Hoskins-Bretherton solution to the Eady problem as initial condition. ...
A Numerical Study of the Stratiform Region of a Fast-Moving Squall Line. Part I: General Description and Water and Heat Budgets
Publisher: American Meteorological Society
Abstract: A two-dimensional nonhydrostatic cloud model is applied to the simulation of a tropical squall line that occurred on 23 June during the COPT 81 experiment. Owing to the use of an ice parameterization scheme, the simulation ...
African Easterly Waves and Convection. Part I: Linear Simulations
Publisher: American Meteorological Society
Abstract: A linearized version of a nonhydrostatic model is used to study the normal-mode selection and the structure of the African easterly waves in dry and moist environments associated with an idealized African easterly jet ...
A Numerical Study of the Stratiform Region of a Fast-Moving Squall Line. Part II: Relationship between Mass, Pressure, and Momentum Fields
Publisher: American Meteorological Society
Abstract: In a companion paper, a two-dimensional simulation of a fast-moving tropical squall line was successfully compared to observations performed during the COPT81 experiment over West Africa. The full ice phase parameterization ...
Role of Gravity Waves in Triggering Deep Convection during TOGA COARE
Publisher: American Meteorological Society
Abstract: The role of gravity waves in the initiation of convection over oceanic regions during the Tropical Ocean Global Atmosphere Coupled Ocean?Atmosphere Response Experiment (TOGA COARE) experiment is investigated. First, an ...
Use of a Radar Simulator on the Output Fields from a Numerical Mesoscale Model to Analyze X-Band Rain Estimators
Publisher: American Meteorological Society
Abstract: A full radar simulator, which works with the 3D output fields from a numerical mesoscale model, has been developed. This simulator uses a T-matrix code to calculate synthetic radar measurements, accounts for both backscattering ...
Modification of Surface Fluxes by Atmospheric Convection in the TOGA COARE Region
Publisher: American Meteorological Society
Abstract: The mesoscale variability of surface heat fluxes induced by atmospheric convection is studied by using 3D cloud explicit simulations and surface observations. Two convective cases observed during the Coupled Ocean?Atmosphere ...