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RISAbsolute and Convective Instability of the African Easterly Jet
Publisher: American Meteorological Society
Abstract: he stability of the African easterly jet (AEJ) is examined using idealized numerical simulations. It is found that a zonally homogeneous representation of the AEJ can support absolute instability in the form of African ...
Energy Dispersion in African Easterly Waves
Publisher: American Meteorological Society
Abstract: he existence of an upstream (eastward) group velocity for African easterly waves (AEWs) is shown based on single-point lag regressions using gridded reanalysis data from 1990 to 2010. The eastward energy dispersion is ...
The Genesis of African Easterly Waves by Upstream Development
Publisher: American Meteorological Society
Abstract: genesis mechanism for African easterly waves (AEWs) is proposed. In the same manner that new troughs and ridges in the midlatitudes form downstream of existing ones through a mechanism known as downstream development, it ...
Evolution of African Easterly Waves in Potential Vorticity Fields
Publisher: American Meteorological Society
Abstract: he evolution of African easterly waves (AEWs) leading to tropical cyclones (TCs) in the Atlantic during 2000?08 is examined from isentropic potential vorticity (PV) and Lagrangian streamline perspectives. Tropical cyclone ...
Interannual-to-Multidecadal Variability of Vertical Shear and Tropical Cyclone Activity
Publisher: American Meteorological Society
Abstract: patiotemporal patterns of tropics-wide vertical shear variability are extracted after separating a 58-yr data record into high-frequency (HF, periods of 1.5?8 yr) and low-frequency (LF, periods greater than 8 yr) components. ...
MJO and Tropical Cyclogenesis in the Gulf of Mexico and Eastern Pacific: Case Study and Idealized Numerical Modeling
Publisher: American Meteorological Society
Abstract: The role of the Madden?Julian oscillation (MJO) in modulating the frequency and location of tropical cyclogenesis over the eastern Pacific and the Gulf of Mexico during August?September 1998 is examined. During the ...
Performance of the ECMWF Operational Analyses over the Tropical Indian Ocean
Publisher: American Meteorological Society
Abstract: The quality of the ECMWF operational analyses is evaluated against independent upper-air sounding data collected during the Joint Air?Sea Monsoon Interaction Experiment (JASMINE; April?May 1999) and the Indian Ocean ...
Climatology of Vertical Wind Shear over the Tropical Atlantic
Publisher: American Meteorological Society
Abstract: The spatiotemporal variability of the 200?850-hPa vertical wind shear over the tropical Atlantic is examined for a period of 46 yr. This work extends and updates past studies by considering a longer data record as well as ...
Evolution of Mixed Rossby–Gravity Waves in Idealized MJO Environments
Publisher: American Meteorological Society
Abstract: A linear shallow water model is used to simulate the evolution of mixed Rossby?gravity (MRG) waves in background states representative of the convective phase of the Madden?Julian oscillation (MJO). Initial MRG wave ...
A Global View of Equatorial Waves and Tropical Cyclogenesis
Publisher: American Meteorological Society
Abstract: his study investigates the number of tropical cyclone formations that can be attributed to the enhanced convection from equatorial waves within each basin. Tropical depression (TD)-type disturbances (i.e., easterly waves) ...