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RISIntraseasonal Variability over Tropical Africa during Northern Summer
Publisher: American Meteorological Society
Abstract: The intraseasonal variability over Africa during northern summer was analyzed, using 25 years of NCEP? NCAR reanalysis and satellite data. The dominant pattern of variability was one of enhanced deep convection over the ...
Physical and Numerical Contributions to the Structure of Kelvin Wave-CISK Modes in a Spectral Transform Model
Publisher: American Meteorological Society
Abstract: ?Nonlinear Kelvin wave-CISK modes? are critically assessed as a possible mechanism for the Madden?Julian Oscillation (MJO) with a global spectral transform model and a one-dimensional analog. Convection is parameterized ...
Observed Changes in the Lifetime and Amplitude of the Madden–Julian Oscillation Associated with Interannual ENSO Sea Surface Temperature Anomalies
Publisher: American Meteorological Society
Abstract: The Madden?Julian oscillation (MJO) is analyzed using the reanalysis zonal wind? and satellite outgoing longwave radiation?based indices of Wheeler and Hendon for the 1974?2005 period. The average lifetime of the MJO events ...
Response of the West African Monsoon to the Madden–Julian Oscillation
Publisher: American Meteorological Society
Abstract: Observations show that rainfall over West Africa is influenced by the Madden?Julian oscillation (MJO). A number of mechanisms have been suggested: 1) forcing by equatorial waves; 2) enhanced monsoon moisture supply; and ...
A Model of Rossby Waves Linked to Submonthly Convection over the Eastern Tropical Pacific
Publisher: American Meteorological Society
Abstract: Equatorward-propagating wave trains in the upper troposphere are observed to be associated with deep convection over the eastern tropical Pacific on the submonthly timescale during northern winter. The convection occurs ...
Observed Propagation and Structure of the 33-h Atmospheric Kelvin Wave
Publisher: American Meteorological Society
Abstract: The structure of the 33-h Kelvin wave, a normal mode of the atmosphere, is examined in 6-hourly station and NCEP?NCAR reanalysis data. Cross-spectral analysis of 6 yr (1993?98) of tropical station pressure data shows a ...
The Tropical–Extratropical Interaction between High-Frequency Transients and the Madden–Julian Oscillation
Publisher: American Meteorological Society
Abstract: The interaction between high-frequency transient disturbances and convection, and the Madden?Julian Oscillation (MJO), is investigated using NCEP?NCAR reanalysis and satellite outgoing longwave radiation data for 15 northern ...
Interactions between ENSO, Transient Circulation, and Tropical Convectionover the Pacific
Publisher: American Meteorological Society
Abstract: The interannual variability of transient waves and convection over the central and eastern Pacific is examined using 30 northern winters of NCEP?NCAR reanalyses (1968/69?1997/98) and satellite outgoing longwave radiation ...
Real-Time Extraction of the Madden–Julian Oscillation Using Empirical Mode Decomposition and Statistical Forecasting with a VARMA Model
Publisher: American Meteorological Society
Abstract: A simple guide to the new technique of empirical mode decomposition (EMD) in a meteorological?climate forecasting context is presented. A single application of EMD to a time series essentially acts as a local high-pass ...
Coupled Land–Atmosphere Intraseasonal Variability of the West African Monsoon in a GCM
Publisher: American Meteorological Society
Abstract: Recent observational studies have suggested a role for soil moisture and land?atmosphere coupling in the 15-day westward-propagating mode of intraseasonal variability in the West African monsoon. This hypothesis is ...