"ea64fa04-2822-4cc5-9014-f18ce1a1ef23" . "QUASI-BIENNIAL OSCILLATION"^^ . "A stratospheric (16 to 35 km altitude) oscillation of equatorial\neast-west winds which vary with a period of about 26 to 30 months or\nroughly 2 years; typically blowing for 12-16 months from the east,\nthen reverse and blowing 12-16 months from the west, then back to\neasterly again."^^ . .