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Dust optical properties over North Africa and Arabian Peninsula derived from the AERONET dataset

机译：来自AERONET数据集的北非和阿拉伯半岛上的尘埃光学特性

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Dust optical properties over North Africa and the Arabian Peninsula areextracted from the quality assured multi-year datasets obtained at 14 sitesof the Aerosol Robotic Network (AERONET). We select the data with (a) largeaerosol optical depth (AOD ≥ 0.4 at 440 nm) and (b) small?ngstr?m exponent (?ext ≤ 0.2) for retaining highaccuracy and reducing interference of non-dust aerosols. The resultindicates that the major fraction of high aerosol optical depth days aredominated by dust over these sites even though it varies depending onlocation and time. We have found that the annual mean and standard deviationof single scattering albedo, asymmetry parameter, real refractive index, andimaginary refractive index for Saharan and Arabian desert dust is 0.944 ± 0.005, 0.752 ± 0.014, 1.498 ± 0.032, and 0.0024 ± 0.0034 at 550 nmwavelength, respectively. Dust aerosol selected by this method is lessabsorbing than the previously reported values over these sites. The weakerabsorption of dust from this study is consistent with the studies usingremote sensing techniques from satellite. These results can help toconstrain uncertainties in estimating global dust shortwave radiativeforcing.
机译：北非和阿拉伯半岛的尘埃光学特性是从在14个气溶胶机器人网络（AERONET）站点上获得的有质量保证的多年数据集中提取的。我们选择以下数据：（a）大气溶胶光学深度（在440 nm处AOD≥0.4）和（b）小ngstr？m指数（？ ext ≤0.2），以保持高精度并减少非气溶胶的干扰。 -粉尘气溶胶。结果表明，高气溶胶光学深度日的主要部分是这些位置上的灰尘，即使它随位置和时间而变化。我们发现，在550 nm波长下，撒哈拉沙漠和阿拉伯沙漠尘埃的单次散射反照率，不对称参数，实际折射率和虚构折射率的年均值和标准偏差为0.944±0.005、0.752±0.014、1.498±0.032和0.0024±0.0034 ， 分别。通过这些方法选择的粉尘气雾剂比以前在这些站点上报告的值吸收率低。该研究对灰尘的吸收较弱，这与使用卫星遥感技术进行的研究一致。这些结果可以帮助限制估计全球尘埃短波辐射强迫的不确定性。

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