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Evaluation of EDAS winds used for backtrajectories

Evaluation of EDAS winds used for backtrajectories. EDAS winds used in HYSPLIT for backtrajectories – residence time worst days, worst sulfur, etc. Also used for trajectory regression attribution analysis But how good are the winds?

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Evaluation of EDAS winds used for backtrajectories

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  1. Evaluation of EDAS winds used for backtrajectories • EDAS winds used in HYSPLIT for backtrajectories – residence time worst days, worst sulfur, etc. • Also used for trajectory regression attribution analysis • But how good are the winds? • We compared EDAS winds to 0Z and 12Z soundings for 500 m, 1500 m, and 3000 m heights at several locations

  2. EDAS rotated CCW 45% at 500 m, misses strong SSW peak at 1500 m, good at 3000 m

  3. Good comparison even at 500 m at Great Falls

  4. Good comparison at all levels at Salem, Oregon

  5. At San Diego EDAS overdoes SSE at 500 m summer, overdoes NW at 1500 m; good overall at 1500 m and 3000 m

  6. Summary of EDAS wind evaluation • EDAS performs very well at 3000 m • EDAS generally good performance at 1500 m. • EDAS marginal performance at 500 m except where there is not much elevated terrain • Backtrajectories started from 500 m or below may start out with a significantly biased wind direction • No systematic bias across different sites noted • We have not yet considered morning versus afternoon performance- may be expected to perform better in afternoon

  7. Generally poor performance by FNL at Fairbanks for all levels

  8. Bandelier 1500m 500m Aqua Tibia 1500m 500m

  9. Wind Cave 500m 1500m Yellowstone 1500m 500m

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