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Sensor Performance Statistics

Sensor Performance Statistics. TAMDAR (and other aircraft) observations are compared with NMC 20km RUC 1-h forecast RUC forecast interpolated in x,y, and log-p to each observation point no TAMDAR data used in NMC RUC No data below 950 mb are included

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Sensor Performance Statistics

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  1. Sensor Performance Statistics • TAMDAR (and other aircraft) observations are compared with NMC 20km RUC 1-h forecast • RUC forecast interpolated in x,y, and log-p to each observation point • no TAMDAR data used in NMC RUC • No data below 950 mb are included • We don’t consider the RUC perfect, but it is consistent in space and time, so can reveal some observation errors

  2. Distribution of TAMDAR obs in the vertical 27-March - 9-April, 0030Z-0130Z

  3. Airline Comparison, 27 March - 9 April, in TAMDAR region, daytime only, p > 500 mb Airline --------Temperature ----- ------Wind Speed -------- N RUC-avg Bias Std N RUC-avg Bias Std AA 21188 1.77 -0.04 0.89 21182 12.40 -0.08 2.49 Canada 12636 -0.91 0.35 1.45 12633 14.24 -0.32 4.08 DL 14936 -0.88 0.21 1.21 13592 15.66 0.42 4.01 FX 33373 2.48 -0.09 1.18 33327 13.14 -0.12 3.16 NW 7262 -3.32 0.31 1.17 7262 12.90 0.24 2.79 TAMDAR 85676 1.08 -0.37 5.14 70297 12.49 1.13 4.09 UA 14318 -3.01 0.07 0.98 14318 12.34 0.15 2.48 UP 14829 3.54 0.28 1.18 14829 13.23 -0.04 3.13

  4. Airline Comparison, 27 March - 9 April, in TAMDAR region, daytime only, p > 500 mb, excluding two bad TAMDAR aircraft Airline --------Temperature ----- ------Wind Speed -------- N RUC-avg Bias Std N RUC-avg Bias Std AA 21188 1.77 -0.04 0.89 21182 12.40 -0.08 2.49 Canada 12636 -0.91 0.35 1.45 12633 14.24 -0.32 4.08 DL 14936 -0.88 0.21 1.21 13592 15.66 0.42 4.01 FX 33373 2.48 -0.09 1.18 33327 13.14 -0.12 3.16 NW 7262 -3.32 0.31 1.17 7262 12.90 0.24 2.79 TAMDAR 84999 1.12 -0.14 2.28 70024 12.48 1.13 4.08 UA 14318 -3.01 0.07 0.98 14318 12.34 0.15 2.48 UP 14829 3.54 0.28 1.18 14829 13.23 -0.04 3.13

  5. Airline Comparison, 27 March - 9 April, in TAMDAR region, daytime only, p > 500 mb, excluding six bad TAMDAR (and Canadian--accidentally) aircraft Airline --------Temperature ----- ------Wind Speed -------- N RUC-avg Bias Std N RUC-avg Bias Std AA 21188 1.77 -0.04 0.89 21182 12.40 -0.08 2.49 Canada 12409 -0.95 0.35 1.46 12406 14.21 -0.31 4.07 DL 14936 -0.88 0.21 1.21 13592 15.66 0.42 4.01 FX 33373 2.48 -0.09 1.18 33327 13.14 -0.12 3.16 NW 7262 -3.32 0.31 1.17 7262 12.90 0.24 2.79 TAMDAR 79047 1.17 -0.19 1.28 65048 12.51 1.10 4.03 UA 14318 -3.01 0.07 0.98 14318 12.34 0.15 2.48 UP 14829 3.54 0.28 1.18 14829 13.23 -0.04 3.13

  6. Airline Comparison, 27 March - 9 April, in TAMDAR region, daytime only, p > 500 mb, excluding five TAMDAR aircraft with bad wind speeds (and five Canadian--accidentally) Airline --------Temperature ----- ------Wind Speed -------- N RUC-avg Bias Std N RUC-avg Bias Std AA 21188 1.77 -0.04 0.89 21182 12.40 -0.08 2.49 Canada 11822 -0.97 0.35 1.44 11822 14.27 -0.29 4.08 DL 14936 -0.88 0.21 1.21 13592 15.66 0.42 4.01 FX 33373 2.48 -0.09 1.18 33327 13.14 -0.12 3.16 NW 7262 -3.32 0.31 1.17 7262 12.90 0.24 2.79 TAMDAR 78977 1.13 -0.12 1.71 65101 12.47 1.07 3.97 UA 14318 -3.01 0.07 0.98 14318 12.34 0.15 2.48 UP 14829 3.54 0.28 1.18 14829 13.23 -0.04 3.13

  7. TAMDAR time series (Four-day periods) All TAMDAR aircraft (T and W) Start Date --------Temperature ----- ------Wind Speed -------- N RUC-avg Bias Std N RUC-avg Bias Std 2005-02-18 26057 -10.94 -2.97 16.03 26057 16.02 1.98 5.03 2005-02-22 26440 -11.79 -0.37 2.56 26440 12.85 1.85 3.97 2005-02-26 24912 -12.03 -0.96 7.85 24912 12.72 1.52 4.09 2005-03-02 28479 -11.18 -0.56 4.01 28479 12.37 1.52 4.26 2005-03-06 28140 -10.54 -0.59 1.22 28140 16.91 1.43 4.25 2005-03-10 27603 -12.64 -0.50 1.66 27603 16.47 1.58 4.75 2005-03-14 34569 -11.93 -0.59 1.20 27955 11.19 2.33 6.23 2005-03-18 31266 -8.42 -0.72 7.03 24761 9.63 1.56 4.10 2005-03-22 35380 -5.01 -0.31 2.12 28282 8.53 1.85 4.16 2005-03-26 34760 0.19 -0.04 3.39 28255 10.15 1.39 3.95 2005-03-30 30101 -1.18 -1.04 8.05* 24745 15.14 1.03 4.37 2005-04-03 22110 1.44 -0.05 1.14 18182 13.21 1.28 4.07 2005-04-07 29334 3.48 -0.09 1.28 23698 9.99 1.12 3.84

  8. TAMDAR time series (Four-day periods) All TAMDAR aircraft (T and W) Start Date ---------RH -------------- N RUC-avg Bias Std 2005-02-18 22534 53.57 2.94 21.08 2005-02-22 23246 55.61 3.87 18.33 2005-02-26 20583 55.84 1.86 16.60 2005-03-02 24238 49.85 2.42 16.31 2005-03-06 23665 49.30 2.52 16.75 2005-03-10 23528 54.97 4.91 17.35 2005-03-14 29650 50.26 6.70 15.95 2005-03-18 25934 58.26 3.87 15.52 2005-03-22 29576 59.22 -0.89 14.77 2005-03-26 29413 48.29 -1.73 15.97 2005-03-30 26201 48.76 3.03 15.01 2005-04-03 19188 44.86 -1.05 13.62 2005-04-07 24400 45.44 0.54 14.06

  9. TAMDAR RH characteristics

  10. RUC RH Characteristics

  11. TAMDAR vs RUC RH Characteristics

  12. TAMDAR compared with RUC 1h forecast Most of the following plots show: • TAMDAR measurements (x) • RUC 1h forecast (y) • 45° line is perfect agreement

  13. RH: RUC vs TAMDAR, 0030-0130 UTC, 27 March through 9 April (n = 3302)

  14. Temperature: RUC vs TAMDAR, 0030-0130 UTC, 27 March through 9 April. 2 bad aircraft removed (n = 3302)

  15. Temperature bias (ob minus RUC) , 0030-0130 UTC, 27 March through 9 April, with 10 bad T aircraft removed (some outliers remain)

  16. Same data as previous, showing Temperature bias not correlated with Observed Temperature

  17. Temperature bias (ob minus RUC) , 0030-0130 UTC, 27 March through 9 April, with 10 bad T aircraft removed. Ascents and Descents

  18. Wind analysis • It is helpful to divide winds into along-track and cross-track components • The along-track component is similar to the tailwind. Air Speed errors primarily affect this component • The cross-track component is affected by heading errors.

  19. Along-track wind: RUC vs TAMDAR, 0030-0130 UTC, 27 March through 9 April (n = 3302)

  20. Along-track wind: RUC vs non-TAMDAR, p > 500 mb, 0030-0130 UTC, 27 March through 9 April (n = 12508)

  21. Along-track wind: RUC vs TAMDAR and non-TAMDAR, p > 500 mb, 0030-0130 UTC, 27 March - 9 April

  22. Cross-track wind: RUC vs TAMDAR, 0030-0130 UTC, 27 March through 9 April (n = 3302)

  23. Cross-track wind: RUC vs TAMDAR andnon-TAMDAR, 0030-0130 UTC, 27 March - 9 April

  24. Wind Speed RUC vs TAMDAR, 0030-0130 UTC, 27 March through 9 April

  25. Wind Speed RUC vs TAMDAR and non-TAMDAR, 0030-0130 UTC, 27 March through 9 April

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