Fine mode fraction aerosol over ocean in MODIS SDS

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harshbardhan
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Fine mode fraction aerosol over ocean in MODIS SDS

by harshbardhan » Fri Aug 18, 2023 2:39 am America/New_York

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!
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Re: Fine mode fraction aerosol over ocean in MODIS SDS

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

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Re: Fine mode fraction aerosol over ocean in MODIS SDS

by harshbardhan » Fri Aug 18, 2023 7:18 am America/New_York

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

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Re: Fine mode fraction aerosol over ocean in MODIS SDS

by LAADS_UserServices_M » Tue Aug 22, 2023 7:18 am America/New_York

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.
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