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Chapter 6: mesoscale gravity waves

Chapter 6: mesoscale gravity waves. This ppt summarizes the slides in the textbook. The theory is covered in class. Note: this ppt does not include section 6.6 Bores. Iowa gravity wave time lapse movie mpeg You Tube. Ireland. UK. cold front. 5/24/2002, 21:07 UTC – IHOP. Aral Sea.

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Chapter 6: mesoscale gravity waves

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  1. Chapter 6: mesoscale gravity waves This ppt summarizes the slides in the textbook. The theory is covered in class. Note: this ppt does not include section 6.6 Bores.

  2. Iowa gravity wave time lapse movie mpeg You Tube

  3. Ireland UK cold front

  4. 5/24/2002, 21:07 UTC – IHOP

  5. Aral Sea

  6. Australia

  7. Australia

  8. Fig. 6.1: isochrones of a mesoscale gravity wave crest during a major East Coast snowstorm. The wave was detected in the pressure trace. The wind barbs indicate the vector surface wind shift upon wave passage. x Greensboro (GSO)

  9. moist adiabat (qw=16°C) dry adiabat (q=46°C) Fig. 6.9: the mesoscale gravity wave event may have been triggered by elevated convection, or gravity wave adjustment. The stable low-level layer may have allowed wave ducting towards the NE. qw values (°C)

  10. Fig. 6.11: synoptic setting of gravity wave activity (p’~ a few mb)

  11. Fig. 6.2: SLP analysis in a Midwest snowstorm. dotted lines: wave crests, dashed lines: troughs

  12. Fig. 6.10: schematic of a linear plane mesoscale gravity wave propagating to the right (Uo=0)

  13. see youtube video

  14. Fig. 6.6: polarization relations between q’, p’, u’, and w’ in a westward tilting internal gravity wave blue = cold, red = warm

  15. Critical level: level where wave energy is absorbed cg c Fig. 6.7 Fig. 6.8

  16. geostrophic adjustment: principle • Rossby radius of deformation: • see COMET module • “the balancing act of geostrophic adjustment” • see YouTube video: • geostrophic adjustment: inertio-gravity waves and the Coriolis force

  17. Will a feature last or dissipate? Estimate its LR

  18. 6.6 undular bores and solitary waves:separate slide show

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