Level 2 Ocean Salinity

1. Level 2 Ocean Salinity 13-14 September 2010 ARGANS & L2OS ESL

2. Wind speed retrieval in Model 1 without retrieving wind direction; • Dual from Full versus Full from Full ; • EAFFOV versus AFFOV versus small xi-eta; • Increasing threshold for valid number of measurements; • Appendix;

3. Model_1 retrieving WSn instead of UN10 and VN10

4. Model_1 retrieving WSn instead of UN10 and VN10 • Contents

5. Model_1 retrieving WSn instead of UN10 and VN10

6. Model_1 retrieving WSn instead of UN10 and VN10 • Contents

7. Model_1 retrieving WSn instead of UN10 and VN10 • Contents

8. Model_1 retrieving WSn instead of UN10 and VN10 • Better rate of successful retrievals for the modification of Roughness Model 1 not retrieving wind direction; • Much better convergence for the model with fixed wind direction; • Model 1 with fixed wind direction slightly better correlates with Model 2; • Retrieved Wind Speed for Model 1 with variable wind direction closer to ECMWF initial data; • Recommend using Model 1 with fixed wind direction

9. Dual from Full versus Full from Full

10. Dual from Full versus Full from Full

11. Dual from Full versus Full from Full • Contents

12. Dual from Full versus Full from Full • More successful retrievals for Full-from-Full (FF): 74% instead of 69 %; • Better convergence for FF; there are more points failed to reach convergence for DF; • Better chi2 results for FF; • TEC retrieval for FF has lower cross-track bias; • Recommend using Full Pol from Full Pol rather than Dual Pol from Full Pol;

13. EAFFOV vs AFFOV vs small xi-eta

14. EAFFOV vs AFFOV vs small xi-eta • Contents

15. EAFFOV vs AFFOV vs small xi-eta #GP: 64790, 40733, 34467

16. EAFFOV vs AFFOV vs small xi-eta

17. EAFFOV vs AFFOV vs small xi-eta • Contents

18. EAFFOV vs AFFOV vs small xi-eta • Reducing field of view decreases edge effects but does not eliminate them completely; • Changing field of view does not affect significantly grid point distribution against chi2; • Reducing field of view improves chi2 values, in particularly near the edges, but the edge effect is still well seen; • Recommend not using AFFOV or xieta reduced instead of EAFFOV;

19. Increasing threshold for valid number of measurements Extended AFFOV Threshold: 16(“min”); 30 (“low”); 50; 75

20. Increasing threshold for valid number of measurements Extended AFFOV Threshold: 16(“min”); 30 (“low”); 50; 75

21. Increasing threshold for valid number of measurements AFFOV Threshold: 16(“min”); 30 (“low”); 50; 75

22. Increasing threshold for valid number of measurements • Increasing threshold Tg_num_meas_valid sharply improves quality of results: edge effects and East-West bias are practically eliminated with a proper threshold; • Increasing Tg_num_meas_valid reduces amount of available gridpoints, especially after the threshold exceeds 80-100; compromise value of the threshold should be selected, about 50-60; • Effect of increasing Tg_num_meas_valid is much stronger than redaction of the field of view, from the point of reducing biases and edge effects; if we have to use FOV reduction, it could be more efficiently used in combination with increased Tg_num_meas_valid; • Recommend increasing Tg_num_meas_valid initially to 50;

23. Appendix All pictures in this presentation are apparently affected/contaminated by sun that is illustrated on this slide; some results look more affected than the others – in most cases this is defined only by the colour scale used;