Physical and optical properties of atmospheric aerosols by in-situ and radiometric measurements
Physical and optical properties of atmospheric aerosols by in-situ and radiometric measurements
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DOI：
10.5194/acp-10-2195-2010
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发表时间：
2010-01-01
影响因子：
6.3
通讯作者：
Serio, C.
中科院分区：
文献类型：
--
作者：
Calvello, M.;Esposito, F.;Serio, C.
利用高分辨率（1.5 nm）光谱辐射计（光谱范围400-800 nm）、13级Dekati低压冲击器（尺寸范围30 nm-10 μ m）和AE31气溶胶计（7个波长从370 nm到950 nm）收集的大气气溶胶的物理和光学特性，在意大利西南部的一个半农村站点（Tito Scalo, 40°35' N, 15°41' E, a.s.l 750 m）进行了研究。特别地，我们分析了2008年5月至10月期间来自辐射数据的AOD和埃斯特浊度参数的日平均值，以及来自撞击物数据和黑碳（BC）浓度的质量大小分布。此外，通过反演太阳直射辐射，可以得到同一时期气溶胶柱数和体积大小的分布。不同观测方法的比较，可以验证在地面测量的气溶胶特性的变化是否代表柱状特性的变化，以及在什么条件下。在人为气溶胶负荷的情况下，柱状和原位测量结果一致，而在撒哈拉沙尘侵入的情况下，当沙尘颗粒位于大气高层（4-8公里）时，发现了一些差异，因此对柱状性质的影响大于对地表性质的影响。对于人为气溶胶，通过比较辐射计、撞击器和大气浓度计测量的细微气溶胶组分贡献，证实了良好的相关性，表明在这种情况下，颗粒在低层大气中分布更为均匀，柱状气溶胶的光学性质主要受地表测量分量的支配。
Physical and optical properties of atmospheric aerosols collected by using a high resolution (1.5 nm) spectroradiometer (spectral range 400-800 nm), a 13-stage Dekati Low Pressure Impactor (size range 30 nm-10 mu m), and an AE31 Aethalometer (7 wavelenghts from 370 nm to 950 nm), have been examined in a semi-rural site in Southwest Italy (Tito Scalo, 40 degrees 35' N, 15 degrees 41' E, 750 m a.s.l.). In particular, daily averaged values of AOD and Angstrom turbidity parameters from radiometric data together with mass-size distributions from impactor data and Black Carbon (BC) concentrations have been analyzed from May to October 2008. Furthermore, by inverting direct solar radiances, aerosol columnar number and volume size distributions have been obtained for the same period. The comparison of different observation methods, allowed to verify if, and in what conditions, changes in aerosol properties measured at ground are representative of columnar properties variations. Agreement between columnar and in-situ measurements has been obtained in case of anthropogenic aerosol loading, while in case of Saharan dust intrusions some discrepancies have been found when dust particles were located at high layers in the atmosphere (4-8 km) thus affecting columnar properties more than surface ones. For anthropogenic aerosols, a good correlation has been confirmed through the comparison of fine aerosol fraction contribution as measured by radiometer, impactor and aethalometer, suggesting that, in this case, the particles are more homogeneously distributed over the lower layers of atmosphere and columnar aerosol optical properties are dominated by surface measured component.