Periodicities in Aerosol Optical Depths

Details Periodicities in Aerosol Optical Depths Periodicities in Aerosol Optical Depths

2011-06-10

arxiv.org/abs/1106.2024v1

Physics

Atmospheric and Oceanic Physics

15 pages, 4 figure, Geophys. Res. Lett. draft format

Scientific paper

We investigate the temporal and spatial variability in aerosol optical depth (AOD) over different geographic locations in India due to their important role in the earth-atmosphere radiation budget. The use of continuous wavelet transform pinpoints the spatio-temporal non-stationarity of the periodic variations in the AOD depending on local factors. The optimal time-frequency localization ability of Morlet wavelet accurately isolates the periodic features in the different frequency domains, to study the variations in the dominant periods due to local effects. The origin of the effects on the periodic modulations is then related to physical phenomena of regional nature, which throws considerable light on the observed variations in aerosol optical depths. We also find the phase relationship between different locations and to identify the possible correlations between different geographic locations and related environmental variations.

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