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Long-term (2007-2013) analysis of aerosol optical properties over four locations in the Indo-Gangetic plains

机译：长期（2007-2013年）对印度恒河平原四个位置的气溶胶光学特性进行分析

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The emphasis of the present work lies on the examination of the distribution and spectral behavior of the optical properties of atmospheric aerosols in the Indo-Gangetic plains (IGP). Measurements were performed using an AErosol RObotic NETwork (AERONET) Sun photometer at four sites (Karachi, Lahore, Jaipur, and Kanpur) with different aerosol environments during the period 2007-2013. The aerosol optical depth (AOD) and Angstrom exponent (alpha) were measured, and the results revealed a high AOD with a low a value over Karachi and Jaipur in July, while a high AOD with a high a value was reported over Lahore and Kanpur during October and December. The pattern of the aerosol volume size distribution (VSD) was similar across all four sites, with a prominent peak in coarse mode at a radius of 4.0-5.0 mu m, and in fine mode at a radius of 0.1-4.0 mu m, for all seasons. On the other hand, during the winter months, the fine-mode peaks were comparable to the coarse mode, which was not the case during the other seasons. The single scattering albedo (SSA) was found to be strongly wavelength-dependent during all seasons and for all sites, with the exception of Kanpur, where the SSA decreases with increasing wavelength during winter and post-monsoon. It was found that the phase function of the atmospheric aerosol was high at a small angle and stable around a scattering angle of 90 degrees-180 degrees at all sites and during all seasons. Spectral variation of the asymmetry parameter (ASY) revealed a decreasing trend with increasing wavelength, and this decreasing trend was more pronounced during the summer, winter, and post-monsoon as compared to pre-monsoon. Furthermore, extensive measurements suggest that both real (RRI) and imaginary (IRI) parts of the refractive index (RI) show contrasting spectral behavior during all seasons. Finally, the analysis of the National Oceanic and Atmospheric Administration hybrid single particle Lagrangian integrated trajectory model back trajectory revealed that the seasonal variation in aerosol types was influenced by a contribution of air masses from multiple source locations. (C) 2016 Optical Society of America
机译：本工作的重点在于检查印度恒河平原（IGP）中大气气溶胶光学特性的分布和光谱行为。在2007-2013年期间，使用AErosol机器人网络（AERONET）太阳光度计在四个地点（卡拉奇，拉合尔，斋浦尔和坎普尔）使用不同的气溶胶环境进行了测量。测量了气溶胶光学深度（AOD）和埃指数（alpha），结果显示，7月份，卡拉奇和斋浦尔的AOD值较高，而拉合尔和坎普尔地区的AOD值较高。在十月和十二月。在所有四个位置上，气溶胶体积大小分布（VSD）的模式均相似，其中粗模式下的半径为4.0-5.0微米，而细模式下的半径为0.1-4.0微米，有一个突出的峰。所有的季节。另一方面，在冬季，精细模式的峰值与粗模式相当，而其他季节则不然。发现单散射反照率（SSA）在所有季节和所有地点都强烈依赖波长，除了坎普尔（Kanpur）例外，在冬季和季风后，SSA随波长增加而降低。发现在所有角度和所有季节，大气气溶胶的相位函数在小角度都很高，并且在90度至180度的散射角附近稳定。不对称参数（ASY）的光谱变化显示出随着波长增加而降低的趋势，并且与季风前相比，这种降低趋势在夏季，冬季和季风后更为明显。此外，广泛的测量结果表明，在所有季节中，折射率（RI）的实部（RRI）和虚部（IRI）均显示出相反的光谱行为。最后，对美国国家海洋与大气管理局混合单粒子拉格朗日混合轨迹模型后向轨迹的分析表明，气溶胶类型的季节性变化受到来自多个源位置的气团的影响。 （C）2016美国眼镜学会

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