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Showing 1 to 9 of 9 for “"African easterly waves"”.
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The Genesis and Evolution of African Easterly Waves
The genesis and evolution of easterly waves over the Atlantic Ocean are investigated with a moist multi-level quasi-geostrophic model. The origin of African waves is first re-examined as a linear instability problem of a general basic zonal flow with/without a parameterized latent heating. The …
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African Easterly Waves: Evolution and Relationship to Atlantic Tropical Cyclones
… of all Atlantic hurricanes originate from African easterly waves. Yet, less than 20% of all African waves originate tropical cyclones (including hurricanes). It is of interest to investigate if African waves involved in cyclogenesis possess special characteristics, or if the environment in …
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On the scale interaction between African easterly waves and convention
… channel model is used to study the dynamics of African waves. In part I the structure and energetics of the African easterly waves are well replicated compared to observations. Highly simplified physical processes, including Ekman damping and relaxation, are included to study the dynamic …
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Spatial pattern of African Easterly Waves and their Precipitation in Northern Africa
African Easterly Waves (AEWs) are synoptic-scale weather systems influencing Northern Africa, with distinct northern and southern tracks affected by the African Easterly Jet (AEJ), as noted in previous research. These waves are most active in the lower troposphere around 700-850 hPa. This study …
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Future changes in extreme rainfall events and African easterly waves over West Africa
This study examines the relationship between African Easterly Waves (AEWs) and extreme rainfall events over West Africa, and investigates how climate change could alter this relationship in the future. Satellite observations, reanalysis data, and regional climate model (RCA4) simulations (forced …
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Modulation of African lightning and rainfall by the global five day wave
… amplitude of a five day global pressure wave and African easterly waves. Evidence was also presented for the mesoscale lightning to be correlated with African rainfall and kinetic energy. The five day global pressure wave was located in terms of phase and amplitude for every day of the years 1989, …
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Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics
… variability of smoke particles from the South African biomass burning is attributed by low-frequency oscillations of baroclinic instability of the region. We proposed that the impacts of Saharan Air Layer (SAL) on large-scale climate dynamics mainly occur through coupling of dust radiative …
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Spatio-temporal variability of aerosols in the tropics relationship with atmospheric and oceanic environments
… related to the westward propagating synoptic African Easterly Waves of the Tropical Atlantic Ocean affect the horizontal and vertical structure of the environment. The statistical significance of these two modes is tested with the use of two different spectral techniques. The pattern of …
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Toward better subseasonal-to-seasonal prediction: physics-oriented model evaluation and predictability of tropical cyclones
… Atlantic can be attributed to the hyperactive African easterly waves and stronger deep convective heating. The biases are associated with the deficiencies in the cumulus schemes of the GEFS. The precipitation initiates too early with respect to the column water vapor. And there is a dry bias in …