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GRGAQS: Meteorological Modeling

GRGAQS: Meteorological Modeling. Presentation to the SWCAA By ENVIRON International Corporation Alpine Geophysis, LLC August 8, 2006. Today’s Presentation. Further evaluation of MM5 performance Analyses conducted for August and November modeling episodes:

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GRGAQS: Meteorological Modeling

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  1. GRGAQS:Meteorological Modeling Presentation to the SWCAA By ENVIRON International Corporation Alpine Geophysis, LLC August 8, 2006

  2. Today’s Presentation • Further evaluation of MM5 performance • Analyses conducted for August and November modeling episodes: • 4-km surface wind fields in Gorge area • Cloud cover and fog on 4-km grid • Compare to satellite and Wishram camera • Wind, temperature, RH at Wishram

  3. Wind Performance, August 2004 • Hi bscat 8/10-8/16, 8/19 • Poor performance at central sites 8/10-8/13 • Wind opposite direction • Good performance 8/14-8/22 • Maybe too light on some days

  4. Wind Performance, November 2004 • Hi bscat 11/8-11/13 • Overall better performance than for August episode • Very good performance over 11/8-11/13 • Some stagnation leads to wind direction errors • Some windy periods are too light

  5. August 2004 notes at Wishram camera: Cloud Cover 8/10 Scattered clouds < half of sky, No layered haze 8/11 No clouds, No layered haze 8/12 Scattered clouds < half of sky, No layered haze 8/13 No clouds, No layered haze 8/14 (high) Overcast > half of sky, No layered haze 8/15 Scattered clouds < half of sky, No layered haze 8/16 (high thin) Overcast > half of sky, No layered haze 8/17 (high thin) Overcast > half of sky, No layered haze 8/18 (high thin) Overcast > half of sky, No layered haze 8/19 Scattered clouds < half of sky, No layered haze 8/20 (high thin) Overcast > half of sky, No layered haze 8/21 (high) Overcast > half of sky, No layered haze 8/22 Overcast > half of sky, No layered haze

  6. Wishram Camera August 13, noon Pristine

  7. Wishram Camera August 14, noon Pristine

  8. Wishram Camera August 19, noon Pristine

  9. August 2004 Cloud Cover • Performance appears adequate • MM5 cannot replicate high thin/wispy cirrus • MM5 usually underperforms for scattered small-scale afternoon cumulus • These should not play significant role in regional PM chemistry

  10. November 2004 notes at Wishram camera: Cloud Cover 11/3 Scattered clouds < half of sky, No layered haze 11/4 No clouds, Ground-based layered haze only 11/5 (high thin) Overcast > half of sky, No layered haze (hazy) 11/6 Scattered clouds < half of sky, Ground-based layered haze only 11/7 Overcast > half of sky, No layered haze (hazy) 11/8 Overcast > half of sky, Weather concealing scene (thick haze) 11/9 Overcast > half of sky, Weather concealing scene (thick haze) 11/10 Overcast > half of sky, Weather concealing scene (fog) 11/11 Overcast > half of sky, Weather concealing scene (thick haze) 11/12 Overcast > half of sky, Weather concealing scene (fog) 11/13 Overcast > half of sky, Weather concealing scene (thick haze) 11/14 Overcast > half of sky, Weather concealing scene (distant fog) 11/15 Overcast > half of sky, Weather concealing scene 11/16 Overcast > half of sky, No layered haze 11/17 Scattered clouds < half of sky, No layered haze 11/18 Overcast > half of sky, No layered haze

  11. Wishram Camera November 6, noon Pristine

  12. Wishram Camera November 8, noon Pristine

  13. Wishram Camera November 10, noon Pristine

  14. Wishram Camera November 15, noon Pristine

  15. November 2004 Cloud Cover • Large-scale higher clouds appear well simulated • Low-level cloud/fog events are not • Especially on the high bscat days • This will impact aqueous PM chemistry • This would impact bscat reconstruction • If we use MM5-predicted humidity • EPA method: use measured humidity

  16. Wishram Meteorology

  17. Wishram Meteorology

  18. Wishram Meteorology

  19. Wishram Meteorology

  20. August 2004 Meteorology • Wind speed/direction well simulated • Terrain channeling may be leading to higher observed speeds and direction bias • Temperatures on 4-km grid are highly suspect • RH performance follows poor temperature performance • Need to investigate further • Could use in some initial PM modeling

  21. Wishram Meteorology

  22. Wishram Meteorology

  23. Wishram Meteorology

  24. Wishram Meteorology

  25. November 2004 Meteorology • Wind speed/direction performance appears acceptable • Temperature performance is poor • Need to investigate cause • RH is too low – no fog – not associated with temperature problem • This episode is currently not useable

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