Page 1 of 1

Fine mode fraction aerosol over ocean in MODIS SDS

Posted: Fri Aug 18, 2023 2:39 am America/New_York
by harshbardhan
Hello,
I am searching for the SDS related to fine mode fraction (FMF) aerosol over ocean in the latest available MODIS collection 6.1 datasets.
Please help me to find the correct SDS. Thanks!
Harshbardhan

Re: Fine mode fraction aerosol over ocean in MODIS SDS

Posted: Fri Aug 18, 2023 6:50 am America/New_York
by LAADS_UserServices_M

Re: Fine mode fraction aerosol over ocean in MODIS SDS

Posted: Fri Aug 18, 2023 7:18 am America/New_York
by harshbardhan
But i am again confused with the specification. Do you consider these two SDS for fine mode information?
Optical_Depth_Small_Best_Ocean
Optical_Depth_Ratio_Small_Ocean

Re: Fine mode fraction aerosol over ocean in MODIS SDS

Posted: Tue Aug 22, 2023 7:18 am America/New_York
by LAADS_UserServices_M
In MODIS collection 6.1 datasets (e.g. MOD04_L2), there are four variables relevant to fine model:

1. Optical_Depth_Ratio_Small_Ocean_0.55micron: is the fraction of AOT (at 0.55 micron) contributed by fine mode for average solution.

2. Optical_Depth_Small_Average_Ocean: is the retrieved optical thickness for fine mode (average solution) for 0.47, 0.55, 0.66, 0.86, 1.24, 1.63, 2.13um)

3. Optical_Depth_Small_Best_Ocean: is the retrieved optical thickness for fine mode (best solution for 0.47, 0.55, 0.66, 0.86, 1.24, 1.63, 2.13um)

4. Solution_Index_Ocean_Small: is the index identifying fine mode from Look Ip Table for “best” solution. Solution number index (1 through 4) for small particles. Indices of ocean models 1 through 4 correspond to accumulation (small) mode models with effective radii 0.10, 0.15, 0.20, 0.25 µm, respectively.