1. Scatterometer wind retrieval over Lake Baikal Alexey Pan’kov (Irkutsk State University)

2. Necessity Helios wind forcing sun radiation

3. BeforeNow Situation

4. Principle 1 2 3

5. Normalized radar backscatter cross-section (σ 0 ) wave length (should be of order of roughness) polarization incidence angle roughness ⇒ wind speed wind direction σ 0 is a function of:

6. σ 0 measurement

7. Model function σ 0 = F(V, θ, α, pol) wave length is given V - wind speed θ - wind direction α - incidence angle pol - polarization

8. Model function wind speed dependence

9. Model function wind direction dependence

10. σ 0 for Lake Baikal (4 Aug 2008)

11. Wind areas (WVC)

12. Maximum likelihood estimation maximum likelihood minimum mean squares

13. speed angle Error surface speed angle gradient search Two ambiguities

15. Problems Ambiguity removal Quality control (rain) Too high velocities Historical data are unavailable yet Lack of appropriate infrastructure

16. Thank you for your attention!

17. smooth surfacerough surface