Optical particle sizing in vertically inhomogeneous turbid media

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Presentation transcript:

Optical particle sizing in vertically inhomogeneous turbid media Alexander A. Kokhanovsky, Vladimir V. Rozanov Institute of Remote Sensing, Bremen University P. O. Box 330440 Bremen, Germany alexk@iup.physik.uni-bremen.de

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

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

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

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

Results of calculations

Algorithm

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

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 15-11.25-7.5 14.9-11.4-7.9 13.0 39. 11.5 15-12.5-10 14.9-12.7-10.5 14.3 LWP(inh)=73.3kg/m^2, LWP(hom)=83.9kg/m^2, difference:16.6kg/m^2 0.5-0.9km

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