This research study is focused on to investigate the seasonal, temporal and spatial variations of aerosol optical depths (AODs) over various major cities in South-West region of India and further to understand the impact of aerosols on cloud microphysics. AOD at 550 nm derived from the MODIS sensors have been analyzed in the present study for the ten-year period of 2003–2012. The retrieved satellite data have been used to study the temporal heterogeneity in columnar aerosol characteristics over the eight different places of South West (SW) region of India with a resolution of 1° × 1° grids in magnitude. On yearly basis, high annual mean AOD values (> 0.5) were found at Mumbai (~ 0.53 ± 0.13), Ahmedabad (~ 0.58 ± 0.18) and Kolkata (~ 0.74 ± 0.064) whereas low annual average AOD values (< 0.2) were found at Bengaluru (~ 0.10 ± 0.22). The percentage variation between highest and lowest average annual AOD value was found to be maximum over Ahmedabad (~ 118%) and minimum over Bengaluru (~ 22%) during the study period of 2003–2012. It was also found that the cloud cover fraction increases with AOD (550 nm) at all selected eight places of SW region of India for the whole period of 2003–2012. The maximum positive slope of the trend line for AOD and CF was found to be for Delhi (+ 0.47) and the minimum for Thiruvananthapuram (+ 0.182). It indicates that the significant increase in the correlation between AOD and CF was found to be larger for those regions which have more aerosol particles produced due to industrial and urban domestic activities, etc. A single paired double tailed distribution student’s t-test has also been applied to the Terra AOD values and cloud parameters with a confidence level of 95%.

这项研究的重点是调查印度西南地区各个主要城市的气溶胶光学深度（AOD）的季节，时间和空间变化，并进一步了解气溶胶对云微物理的影响。在2003-2012的十年期间，在本研究中分析了来自MODIS传感器的550 nm AOD。检索到的卫星数据已用于研究印度西南（SW）地区八个不同地方的柱状气溶胶特征的时间异质性，其分辨率为1°×1°网格。按年计算，孟买（〜0.53±0.13），艾哈迈达巴德（〜0.58±0.18）和加尔各答（〜0.74±0.064）的年平均AOD值较高（> 0.5），而年均AOD值较低（<0.2）在班加罗尔发现（〜0.10±0.22）。在2003年至2012年的研究期间，最高的AOD年平均值和最低的AOD年平均值之间的百分比变化在艾哈迈达巴德地区最大（〜118％），在班加罗尔地区最小（〜22％）。我们还发现，在2003年至2012年的整个印度期间，印度西南部所有选定的8个地方的云量随AOD（550 nm）的增加而增加。发现AOD和CF趋势线的最大正斜率是德里（+ 0.47），而特里凡得琅（Thiruvananthapuram）最小（+ 0.182）。这表明，由于工业和城市家庭活动等而产生更多气溶胶颗粒的地区，发现AOD和CF之间的相关性显着增加。