Dust Optical Corrections¶
Role on od550lt1aer¶
od550lt1aer represents the aerosol optical depth for sizes smaller than 1 mu m. The procedure used here to calibrate the dust contribution to od550lt1aer relies on an experimental definition of the distribution of sizes of the optical depth of dust \(\tau_{dust}(D)dD\) of Jasper F. Kok et al 2017 (Nature Geosciences).
The supplementary figure S1 can be decomposed as a table:
| Dmin | Dmax | \(\Delta D\) | \(\tau\) | \(\Delta D*\tau\) |
|---|---|---|---|---|
| 0.2 | 0.5 | 0.3 | 4.2e-4 | 0.000126 |
| 0.5 | 1 | 0.5 | 4.0e-3 | 0.002000 |
| 1 | 2 | 1 | 9.0e-3 | 0.009000 |
| 2 | 5 | 3 | 1.1e-2 | 0.033000 |
| 5 | 10 | 5 | 3.8e-3 | 0.019000 |
| 10 | 20 | 10 | 5.7e-4 | 0.0057 |
The sum of \(\sum_{i}\Delta D_{i} \cdot \Delta \tau_{i} = 0.068826\) which is our normalization factor
The contribution of dust optical depth of particles between 0.2 and 1 mu m is:
\((0.000126+0.002000)/0.068826 = 0.0309\)
so the fraction of particles with sizes between 0.2 and 1 contribute with the 0.0309% to the total optical dust depth, and the biggest contribution is between 2 and 5 with a factor close to 50%.