1 / 18

GLOBAL BIASES IN THE DWELL-LINE MEAN STOKES PARAMETERS FROM SMOS FOR NOVEMBER 2010 Joe Tenerelli

GLOBAL BIASES IN THE DWELL-LINE MEAN STOKES PARAMETERS FROM SMOS FOR NOVEMBER 2010 Joe Tenerelli 25 February 2011. SUMMARY.

maddy
Télécharger la présentation

GLOBAL BIASES IN THE DWELL-LINE MEAN STOKES PARAMETERS FROM SMOS FOR NOVEMBER 2010 Joe Tenerelli

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. GLOBAL BIASES IN THE DWELL-LINEMEAN STOKES PARAMETERS FROM SMOS FOR NOVEMBER 2010 Joe Tenerelli 25 February 2011

  2. SUMMARY To produce the following slides we collected all reconstructed Stokes parameters for the original the November 2010 DPGS (not reprocessed data) files onto the fixed ISEA4H9 grid and computed, at each gridpoint on earth, the median of the dwell-line averaged bias between the ocean scene model and the SMOS brightness temperatures (SMOS - model). We have done this for both the full L1OP results and the simplified JRECON solutions (as before using the same J+/baseline weights). For both DPGS and JRECON and for each polarization a fixed-in-time OTT is applied in director cosine coordinates before projecting the biases (SMOS - model) onto the fixed earth grid. We have only used data in the AF-FOV. Results suggest the following: Differences between DPGS and JRECON are very small for the third and fourth Stokes parameters (less than 1 K in magnitude); The fourth Stokes parameter exhibits biases up to around 1 K for ascending passes and beyond 3 K in for descending passes, suggesting some mixing of the third Stokes into the fourth Stokes parameter; Significant land contamination exists in both DPGS and JRECON for the third and fourth Stokes parameters, suggesting that there is still a problem inherent in the reconstruction process (including effects of antenna pattern errors);

  3. Third Stokes Parameter, Nov 2010 Ascending Passes DPGS

  4. Third Stokes Parameter, Nov 2010 Ascending Passes JRECON

  5. Third Stokes Parameter, Nov 2010 Ascending Passes DPGS-JRECON Differences in the third Stokes parameter are small and noisy and are probably related to differences in the way snapshots are combined.

  6. Third Stokes Parameter, Nov 2010 Descending Passes DPGS

  7. Third Stokes Parameter, Nov 2010 Descending Passes JRECON

  8. Third Stokes Parameter, Nov 2010 Descending Passes DPGS-JRECON Differences in the third Stokes parameter are small and noisy and are probably related to differences in the way snapshots are combined.

  9. Fourth Stokes Parameter, Nov 2010 Ascending Passes DPGS

  10. Fourth Stokes Parameter, Nov 2010 Ascending Passes JRECON

  11. Fourth Stokes Parameter, Nov 2010 Ascending Passes DPGS-JRECON Differences in the fourth Stokes parameter are small and noisy and are probably related to differences in the way snapshots are combined.

  12. Fourth Stokes Parameter, Nov 2010 Descending Passes DPGS

  13. Fourth Stokes Parameter, Nov 2010 Descending Passes JRECON

  14. Fourth Stokes Parameter, Nov 2010 Descending Passes DPGS-JRECON Differences in the fourth Stokes parameter are small and noisy and are probably related to differences in the way snapshots are combined.

  15. First Stokes Parameter, Nov 2010 Ascending Passes DPGS

  16. First Stokes Parameter, Nov 2010 Ascending Passes JRECON There is still land contamination in the simplified reconstructions of the first Stokes parameter, though it is smaller in magnitude, closer to the coastlines, and typically of opposite sign to that obtained from DPGS L1B.

  17. First Stokes Parameter, Nov 2010 Descending Passes DPGS

  18. First Stokes Parameter, Nov 2010 Descending Passes JRECON There is still land contamination in the simplified reconstructions of the first Stokes parameter, though it is smaller in magnitude, closer to the coastlines, and typically of opposite sign to that obtained from DPGS L1B.

More Related