1. Optical particle sizing in vertically inhomogeneous turbid media
Alexander A. Kokhanovsky, Vladimir V. Rozanov
Institute of Remote Sensing, Bremen University
P. O. Box Bremen, Germany

2. Contents Introduction Functional derivative of reflectance Algorithm
Application to synthetic data
Conclusions

3. Functional derivative of reflectance
z=Z/H
plots
variation of droplet
size at depth z

4. Theory VRTE: Boundary conditions:
Upwelling diffuse radiation at the bottom
Downweling diffuse radiation at the top
Solar radiation at the top

5. SCIATRAN: software package for the solution of direct and inverse problems of atmospheric optics
(Rozanov et al., 2011)
Free download: bremen.de/sciatran

6. Results of calculations

12. Algorithm

13. Results of retrievals for synthetic data
865nm
1240nm
1600nm
2100nm
naidr,
SZA=60deg
A=0

14. LWP(inh)=73.3kg/m^2, LWP(hom)=83.9kg/m^2, difference:16.6kg/m^2
N_t
1/cm3
N_r
COT(true)
COT
(retrieved)
ER profile
(true),
(retrieved),
ER(retrieved
using SACURA), 40
39.2
9.5
9.7
13.0
39.
11.5
14.3
LWP(inh)=73.3kg/m^2, LWP(hom)=83.9kg/m^2,
difference:16.6kg/m^2 km

15. Conclusions
It is possible to retrieve vertical profiles of effective radius of droplets in clouds using passive spectral measurements in some cases
The accuracy of the technique is higher for moderately thick clouds (COT=10-30)
The new approach enables the improvement of the liquid water path estimation