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Seasonal variation of vertical distribution of aerosol single scattering albedo over Indian sub-continent: RAWEX aircraft observations

机译：印度次大陆上气溶胶单散射反照率垂直分布的季节性变化：RAWEX飞机观测

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摘要

To characterize the vertical distribution of aerosols and its seasonality (especially the single scattering albedo, SSA) extensive profiling of aerosol scattering and absorption coefficients have been carried out using an instrumented aircraft from seven base stations spread across the Indian mainland during winter 2012 and spring/pre-monsoon 2013 under the Regional Aerosol Warming Experiment (RAWEX). Spatial variation of the vertical profiles of the asymmetry parameter, the wavelength exponent of the absorption coefficient and the single scattering albedo, derived from the measurements, are used to infer the source characteristics of winter and pre-monsoon aerosols as well as the seasonality of free tropospheric aerosols. The relatively high value of the wavelength exponent of absorption coefficient over most of the regions indicates the contribution from biomass burning and dust aerosols up to lower free tropospheric altitudes. A clear enhancement in aerosol loading and its absorbing nature is seen at lower free troposphere levels (above the planetary boundary layer) over the entire mainland during spring/pre-monsoon season compared to winter, whereas concentration of aerosols within the boundary layer showed a decrease from winter to spring. This could have significant implications on the aerosol heating structure over the Indian region and hence the regional climate. (C) 2015 Elsevier Ltd. All rights reserved.
机译：为了表征气溶胶的垂直分布及其季节性特征（特别是单散射反照率，SSA），已使用分布在印度大陆的7个基站的仪器飞机在2012年冬季和春季/春季对气溶胶的散射和吸收系数进行了广泛的分析。区域气溶胶增温实验（RAWEX）下的2013年季风之前。由测量得出的不对称参数垂直分布，吸收系数的波长指数和单个散射反照率的空间变化可用于推断冬季和季风前气溶胶的来源特征以及自由季节的季节性。对流层气溶胶。在大多数区域中，吸收系数的波长指数的相对较高的值表明了生物燃料燃烧和粉尘气溶胶直至较低的对流层高度的贡献。与冬季相比，春季/季风前季节整个大陆的自由对流层水平较低（在行星边界层以上），气溶胶负荷及其吸收特性明显增加，而边界层内的气溶胶浓度却下降了。从冬天到春天这可能会对印度地区的气溶胶加热结构以及地区气候产生重大影响。 （C）2015 Elsevier Ltd.保留所有权利。

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