International Journal For Multidisciplinary Research

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Satellite Retrieved Aerosol Optical Depth Observations over a Semi-arid Region in Southern Peninsular India

Author(s) L. Siva Sankara Reddy, K. Narasimhulu, K. Raja Obul Reddy, G. Balakrishnaiah, K. Rama Gopal
Country India
Abstract In this study, we investigate the seasonal and annual variation of Aerosol Optical Depth (AOD) retrieved from Moderate resolution Imaging Spectroradiometer (MODIS), Multi-angle Imaging SpectroRadiometer (MISR), and Ozone Monitoring Instrument (OMI) satellite products from 2007-2013over a semi-arid region in Southern peninsular India. The seasonal mean MODIS (MISR) are found to be 0.20 ± 0.05 (0.22± 0.00), 0.31 ± 0.06 (0.42 ± 0.10), 0.30 ± 0.08 (0.26 ± 0.02), 0.17 ± 0.05 (0.23 ± 0.04) during winter, summer, monsoon and post-monsoon, respectively. It can be seen from that for each season MISR AOD values are slightly higher than other AOD values, except monsoon season. The significant variations of aerosol optical depth variation in seasonal cycle corresponded to the seasonal variability in aerosol anthropogenic activities and synoptic wind patterns. During winter, the highest frequencies of the MODIS, MISR and OMI AOD data points showed in the range of AOD ≤ 0.4, and their corresponding frequencies was about 64%, 56% and 89% respectively. It should be noted that during summer majority of MODIS AODs (41%) and MISR AODs (48%) lie between 0.3 < AOD < 0.4. The synoptic wind pattern showed the arrival of a north-westerly air mass improves the movement of mixed aerosols to the observation location during summer season.
Keywords Aerosol optical depth, Synoptic winds, Frequency distribution, Semi-arid region
Field Physical Science
Published In Volume 3, Issue 3, May-June 2021
Published On 2021-05-06
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E-ISSN 2582-2160
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