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Quasi‐biennial oscillations in spectral aerosol optical depth

Analysis of long‐term time series of monthly mean aerosol optical depths (AOD) at four tropical stations over Asia and Africa revealed the presence of significant annual oscillations (AO) and quasi‐biennial oscillations (QBO). While the AOs were the dominant features, the QBOs in AOD (QBOAOD) were also quite strong and were well associated with the QBO in stratospheric zonal wind (QBOU). At the equatorial stations, QBOAOD were out of phase with QBOU, while they were in phase at the off‐equatorial stations. However, QBO in both outgoing longwave radiation (OLR) and rainfall showed an out‐of‐phase relationship with QBOAOD at all stations. Copyright © 2009 Royal Meteorological Society