Incorporation of mineralogical composition into models of the radiative properties of mineral aerosol from UV to IR wavelengths
Incorporation of mineralogical composition into models of the radiative properties of mineral aerosol from UV to IR wavelengths
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DOI：
10.1029/1998jd200048
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发表时间：
1999-04-27
影响因子：
4.4
通讯作者：
Toon, OB
中科院分区：
文献类型：
--
作者：
Sokolik, IN;Toon, OB
我们描述了一种技术来模拟矿物气溶胶的辐射特性，占其组成。我们编制了一个数据集的折射率的主要矿物和使用它，沿着与数据的矿物组成的灰尘从不同的位置，计算光谱光学和辐射特性的矿物气溶胶混合物。气候模拟和遥感应用都需要这种辐射特性。我们考虑单个矿物的外部混合物，以及骨料的混合物。我们证明，单个矿物的外部混合物必须包含不切实际的高量的赤铁矿，在500 nm波长处具有低于0.9的单个散射系数。相比之下，赤铁矿与石英或粘土的聚集可以强烈增强尘埃对太阳波长的吸收。我们还模拟了每日平均净（太阳+红外）强迫不同成分的尘埃。我们发现，对于一个给定的组成和类似的大气条件下，聚合物的混合物可以导致正的辐射强迫，而单个矿物的混合物给出了负的强迫。
We describe; a technique to model the radiative properties of mineral aerosols which accounts for their composition. We compile a data set of refractive indices of major minerals and employ it, along with data on mineralogical composition of dust from various locations, to calculate spectral optical and radiative properties of mineral aerosol mixtures. Such radiative properties are needed for climate modeling and remote sensing applications. We consider external mixtures of individual minerals, as well as mixtures of aggregates. We demonstrate that an external mixture of individual minerals must contain unrealistically high amounts of hematite to have a single scattering albedo lower than 0.9 at 500 nm wavelength. In contrast, aggregation of hematite with quartz or clays can strongly enhance absorption by dust at solar wavelengths. We also simulate the daily mean net (solar + infrared) forcing by dust of varying compositions. We found that, for a given composition and under similar atmospheric conditions, a mixture of aggregates can cause the positive radiative forcing while a mixture of individual minerals gives the negative forcing.