Earthdata Forum

Hi...,
I am looking for MODIS Level-3 Gridded product: Angstrom Exponent (AE) over OCEAN data products from MODIS. Particularly over oceanic region, as I am able to find AE over lAND only in gridded data format at GIOVANNI portal. but couldn't find any AE product over Ocean in gridded format.
Any remark from the forum !!
Thanks,
Harsh

Following are the only two L3 Angstrom Exponent data over ocean available from MODIS. These are available from L3 daily, weekly and monthly (M[O/Y]08_[D/E/M]3 products.
Aerosol_AE1_Ocean_JHisto_vs_Opt_Depth
Aerosol_AE2_Ocean_JHisto_vs_Opt_Depth

where JHisto = Joint Histogram

Complete product information is available at:
https://ladsweb.modaps.eosdis.nasa.gov/ ... tmosphere/

Does these JHisto product are AE value for each gridpoints or something else?
I am just looking for the grid product such as AOD. But little confused with this JHisto product. Any supported literature would be highly appreciable.
Thanks for the support!

Sorry for a delay in reply. You can find at:
https://atmosphere-imager.gsfc.nasa.gov/products/daily/documentation

Hi,
I have gone through the referred doc on https://atmosphere-imager.gsfc.nasa.gov/products/daily/documentation
Nowhere the term explicitly defined for the Angstrom Exponent over Ocean. They are providing joint histo of AE vs optical depth. Even I couldn't understand the application of joint histo.
I need only AE over ocean so that I can estimate AI (AI = AOD * AE).
Is there any subject/domain expert to help me to choose the right SDS.
Thanks!!

Your question has been sent to the level-3 product SME and hopefully receive a response soon.