Dear all,
I am wondering if there is a clever method to scale normal AOD at 550 nm to DB AOD (for example from MODIS-aqua) other than regression?
Thanks,
Hi Seyed,
The AODs at different wavelengths are mutually connected by the following equation:
AOD(wl_2)/AOD(wl_1) = (wl_1/wl_2)^A
where wl_x denotes the wavelength. A denotes the Ångström exponent. More details could be found in Marseille et al.(2011), The definition of an atmospheric database for Aeolus
Hope it helps.
Sincerely yours,
Yongbo
Dear Yongbo ,
Thanks for your reply. This works for the determination of normal AOD at given wavelength with respect to known normal AOD at the other wavelength using the Ångström exponent . But, I meant the conversion of normal AOD to deep blue AOD.
Best,
I think I got my answer Felix Seidel. I always thought of DB AOD and standard AOD (with no information from blue band) as two products which necessarily show different values of AOD at 550 nm. In fact, I thought that I should use a model to scale standard AOD to DB AOD, or vice versa, to make them comparable.
According to Sayer 2013 (http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50600/abstract), I found that DB AOD and standard AOD at 550 nm (for example, from AERONET) can be directly compared and they do not need to be scaled.
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