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Optical particle sizing in vertically inhomogeneous turbid media

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

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Optical particle sizing in vertically inhomogeneous turbid media

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  1. 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

  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 atthe bottom Downweling diffuse radiation atthe top Solar radiation atthe top

  5. 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

  6. Results of calculations

  7. Algorithm

  8. Resultsof retrievals for synthetic data 865nm 1240nm 1600nm 2100nm naidr, SZA=60deg A=0

  9. LWP(inh)=73.3kg/m^2, LWP(hom)=83.9kg/m^2, difference:16.6kg/m^2 0.5-0.9km

  10. 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

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