Quasi-biennial oscillations in spectral aerosol optical depth

Beegum, S. Naseema ; Krishnamoorthy, K. ; Babu, S. Suresh ; Reddy, R. Ramakrishna ; Gopal, K. Rama ; Ahmed, Y. Nazeer (2009) Quasi-biennial oscillations in spectral aerosol optical depth Atmospheric Science Letters, 10 (4). pp. 279-284. ISSN 1530-261X

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/asl.243...

Related URL: http://dx.doi.org/10.1002/asl.243


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.

Item Type:Article
Source:Copyright of this article belongs to Royal Meteorological Society.
Keywords:Aerosol Optical Depth; QBO; Planetary Wave
ID Code:17188
Deposited On:16 Nov 2010 08:15
Last Modified:04 Jun 2011 04:32

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