Retrieval of aerosol optical properties based on the spheroid model
Retrieval of aerosol optical properties based on the spheroid model
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DOI：
10.2151/jmsj.2010-505
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发表时间：
2010-10
影响因子：
3.1
通讯作者：
Eriko Kobayashi;A. Uchiyama;A. Yamazaki;R. Kudo
中科院分区：
文献类型：
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作者：
Eriko Kobayashi;A. Uchiyama;A. Yamazaki;R. Kudo
用于分析天空辐射计数据的Skyrad软件包(SKYRAD.pack)利用了基于Mie理论的气溶胶反演算法。然而，在模拟尘埃状气溶胶的光学性质时，有必要考虑颗粒的非球形性。我们将基于椭球模型的气溶胶反演算法应用于SKYRAD.pack。我们利用气溶胶模式的模拟数据对模型进行了检验，并验证了类尘埃气溶胶光学性质可以用椭球模型准确地反演。此外，我们还分析了2006年4月在日本筑波收集的天空辐射计数据。结果表明，当采用直接通量归一化的漫射天空通量，即气溶胶光学厚度未知时，在对亚洲沙尘的观测分析中，球体模型比球体模型能更准确地反演气溶胶光学性质。此外，如果可以确定太阳定标常数，则无论是基于Mie理论的情况还是基于椭球模型的情况，都可以准确地反演气溶胶的光学性质。
The Skyrad software package (SKYRAD.pack), which is used to analyze sky radiometer data, utilizes aerosol retrieval algorithms that are based on the Mie theory. In modeling the optical properties of dust-like aerosols, however, it is necessary to account for particle nonsphericity. We applied aerosol retrieval algorithms based on the spheroid model to SKYRAD.pack. We tested the model using simulated data from aerosol models and verified that dust-like aerosol optical properties can be accurately retrieved using the spheroid model. Moreover, we analyzed sky radiometer data collected in Tsukuba, Japan, in April 2006. The results demonstrate that when the diffuse sky flux normalized by the direct flux is used, i.e., the aerosol optical thickness is unknown, the spheroid model can retrieve aerosol optical properties more accurately than the sphere model in the analysis of observations in the case of Asian dust. Furthermore, if solar calibration constants can be determined, aerosol optical properties can be accurately retrieved in both the case based on the Mie theory and the case based on the spheroid model.