This paper investigates aerosol properties (physical, optical and radiative) to understand the aerosol climatology (2008–17) over four Aerosol Robotic Network (AERONET) sites situated in different continents. For this purpose, the chosen sites are Jaipur, India in Asia, Ilorin, Nigeria in Africa, Birdsville, Queensland in Australia and White Sand, New Mexico in America. The higher AOD were found at Jaipur (AOD≈0.57; α = 0.38) during month of June and at Ilorin (AOD ≈ 1.12 and α ≈ 0.56), Africa during February. The value of SSA are also found higher i.e. 0.94 and 0.96 during the MAM over Jaipur and Ilorin respectively due to dominance of dust aerosols. Ilorin experiences the influence of harmattan winds during November to March and shows significant increase not only in coarse mode but also in fine particles fraction. While the remaining sites i.e. White Sand, America; and Birdsville, Australia are found relatively pristine based on monthly averaged AOD, AE (α) and SSA. The estimated direct radiative forcing using SBDART indicates that Ilorin and Jaipur sites in Africa-Asia exhibit much higher values of TOA and BOA as compared to White Sands and Birdsville in America-Australia. The annual averaged radiative forcing were estimated over Ilorin (38.38 ± 16.89 W m⁻²) and Jaipur (36 ± 8.34 W m⁻²). Similarly, high radiative forcing efficiency of 66.86 ± 16.69 W m⁻² τ_0.55nm⁻¹and 67.96 ± 20.46 W m⁻² τ_0.55nm⁻¹ were calculated for Ilorin and Jaipur, respectively. The influence of emission differs in different continents i.e. Africa-Asia to America-Australia sites.

本文研究了气溶胶特性（物理，光学和辐射），以了解位于不同大陆的四个气溶胶机器人网络（AERONET）站点上的气溶胶气候学（2008-17）。为此，选择的地点是亚洲的印度斋浦尔，非洲的伊洛林，尼日利亚的非洲，澳大利亚昆士兰州的伯兹维尔和美国新墨西哥州的白沙。在6月的斋浦尔（AOD≈0.57;α= 0.38）和2月的非洲伊洛林（AOD≈1.12和α≈0.56）发现较高的AOD。由于粉尘气溶胶占主导地位，在MAM中，SSA的值也比斋浦尔和Ilorin高，分别为0.94和0.96。伊洛林在11月至3月期间受到harmattan风的影响，不仅在粗模式下而且在细颗粒部分上也显示出显着增加。而其余的网站即 美国白沙；根据每月平均AOD，AE（α）和SSA，发现澳大利亚和Birdsville相对原始。使用SBDART估算的直接辐射强迫表明，与美国-澳大利亚的白沙和伯德斯维尔相比，非洲-亚洲的伊洛林和斋浦尔站点的TOA和BOA值更高。估计年平均辐射强迫超过Ilorin（38.38±16.89 W m^-2）和斋浦尔（36±8.34 W m ^-2）。类似地，高辐射强迫的66.86±16.69女男效率^-2 τ _0.55nm ^-1和67.96±20.46脉冲W M ^-2 τ _0.55nm ^-1分别计算为伊洛林和斋浦尔。排放的影响在不同的大陆（即非洲-亚洲到美洲-澳大利亚）不同。