A new method to calculate multitemporal aerosol optical depth using geostationary satellite data

What is it about?

We propose an N-Dimensional Cost Function (NDCF) method for multi-temporal AOD retrieval. The NDCF method permits flexible number of observations and allow AOD variation among observations. The NDCF method can deal with absorption aerosol cases.

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Why is it important?

The official retrieval method of Himawari AOD product uses (second) minimum reflectance value over a period of time and modified Kaufman method to estimate the surface reflectance. However, such method might not hold for absorption aerosol cases, in which the satellite-received radiance may not increases with increasing AOD and, thus, the (second) minimum reflectance value doesn’t represent the actual surface reflectance. We propose an N-Dimensional Cost Function (NDCF) method for multitemporal AOD retrieval which can deal with absorption aerosol cases. The NDCF method is more suitable for AOD retrieval over North China Plain in which the urban/industrial absorption aerosols is dominant. Besides, the NDCF method, which permits flexible number of observations and allow AOD variation among observations, is well fitted for geostationary satellite observations.

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