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Intermittent Turbulence in CASES99

Intermittent Turbulence in CASES99. Jielun Sun NCAR. Facts about intermittent turbulene in CASES99. Except 5 windy nights (7,13,15,16,and 17 Oct.), intermittent turbulence occurred throughout the nights of 14 of 24 nights.

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Intermittent Turbulence in CASES99

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  1. Intermittent Turbulence in CASES99 Jielun Sun NCAR

  2. Facts about intermittent turbulene in CASES99 • Except 5 windy nights (7,13,15,16,and 17 Oct.), intermittent turbulence occurred throughout the nights of 14 of 24 nights. • Intermittent turbulence occurred at the beginning of night for 5 nights (11,12,25,27, and 29 Oct); at the end of night on 28 Oct.

  3. Common causes of intermittent turbulence • Decoupling from ground radiative cooling • Internal gravity waves (IGW) • Drainage flow • Lowing of LLJ • Fronts

  4. Outlines • Ekman spiral • Examples of various intermittent turbulence with focus on IGW • Very stable layer • Impacts of intermittent turbulence on SBL

  5. Ekman spiral

  6. Decoupling from ground radiative cooling

  7. Drainage flow

  8. Fronts

  9. IGW

  10. IGW

  11. IGW on wind

  12. VSBL

  13. Impacts of intermittent turbulence

  14. Summary and future work • IGW is everywhere, and is the common cause of intermittent turbulence • Talk to Carmen about IGW • Impacts of intermittent turbulence • Parameterization of SBL

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