A relationship between equatorial lower stratospheric QBO and El Nino

Computer Science – Sound

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Atmospheric Temperature, El Nino, Equatorial Regions, Pressure Oscillations, Stratosphere, Wave Propagation, Zonal Flow (Meteorology), Balloon Sounding, Rocket Sounding, Sea Surface Temperature, Solar Cycles, Vertical Distribution

Scientific paper

Cycle-to-cycle evolution of zonal wind quasi-biennial oscillation (QBO) is studied making use of meteorological balloon and M-100 rocket data at Trivandrum (8.5 deg N, 77 deg E) for a period of about 19 yr from 1971 to 1990. The height of occurrence of zonal wind QBO maxima is found to vary systematically from one cycle to the next. The successive QBO maxima (easterly or westerly) occur progressively at greater heights and, after reaching a particular height, the next maximum (easterly or westerly) occurs at a lower height. Thereafter, the upward progression of the successive maxima starts again. It is found that the upward progression of the QBO maxima is closely associated with the occurrence of an EL Nino event. A simple physical mechanism is suggested for this relationship between the QBO and El Nino. It is hypothesized that if the vertical wavelength of the Kelvin and mixed Rossby-gravity (MRG) waves are smaller during an El Nino event, the observed upward progression of the QBO maxima can be explained.

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