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DMU Arctic polar plots

DMU Arctic polar plots. P.A.M. Berry and R.G. Smith You owe us some drinks, especially Richard who plotted all of these whilst preparing for his Ph.D. defence!. Introduction.

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DMU Arctic polar plots

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  1. DMU Arctic polar plots P.A.M. Berry and R.G. Smith You owe us some drinks, especially Richard who plotted all of these whilst preparing for his Ph.D. defence!

  2. Introduction • This ppt contains polar plots of the waveform distribution for different echo types for three cycles: A031 (30 March 1995 start), A036 ( 21 September 1995 start), A041 (15 March 1996 start) of ERS2. • These cycles have been fully processed, so the ocean retracker (9) is the full Brown model fit, and all waveforms that conform to this model have been retracked with the Brown model. • The first plots show the Brown model waveform spatial distribution

  3. A031 retracker 9 • Brown model waveforms: note sea-ice around Greenland progressively diminishing successful Brown model retracking towards coast: temporal averaging a factor Percentage of total echoes

  4. A036 retracker 9 • Far higher proportion of Brown model echoes in summer, again grading down into the sea-ice Percentage of total echoes

  5. A041 retracker 9 • Some structure apparent where tiny percentage of echoes are still passing a Brown model fit away from open ocean Percentage of total echoes

  6. Retracker 7 • The next slides show complex echo shapes from composite surfaces; expect ice/water combination.

  7. A031 retracker 7 • Significant occurrence in this cycle. Percentage of total echoes

  8. A036 retracker 7 Percentage of total echoes

  9. A041 retracker 7 Percentage of total echoes

  10. A031 retracker 10 • Very bright, very thin quasi-specular echoes • Note increased occurrence at ice edge, very still pools of water, also melt pools on ice Percentage of total echoes: note that some echoes occur at >40% for retracker 10 plots, these appear as red

  11. A036 retracker 10 • Very high occurrence at ice edge and melt pools Percentage of total echoes: note that some echoes occur at >40% for retracker 10 plots, these appear as red

  12. A041 retracker 10 • Structure apparent in echo occurrence over ice Percentage of total echoes: note that some echoes occur at >40% for retracker 10 plots, these appear as red

  13. Next slides show retracker 11. Extremely complex echoes from composite surfaces with diverse components: profoundly non-uniform surface.

  14. A031 retracker 11 Percentage of total echoes • Wealth of detailed spatial information from this echo type

  15. A036 retracker 11 Percentage of total echoes • Much smaller area in summer exhibiting these characteristics, as expected. Storm conditions can cause a few echoes over ocean to trigger this retracker: hence ‘stripes’ of ocean dots from 3 day sub-cycle

  16. A041 retracker 11 Percentage of total echoes • Structure evident

  17. A031 retracker 8 • Very calm ocean triggers this retracker, also snow on ice can return a similar echo shape. Percentage of total echoes

  18. A036 retracker 8 Percentage of total echoes • Calm ocean

  19. A041 retracker 8 Percentage of total echoes

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