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COHERENT STRUCTURE OF DRIZZLE EVENTS

COHERENT STRUCTURE OF DRIZZLE EVENTS. Chin-Hoh Moeng National Center for Atmospheric Research. The RF02 Case. Display time: ~ hour 4.5 – hour 6 Fields plotted: Drizzle rate at ~ 4 m Surface theta flux theta fluctuation at ~ 4 m. Surface heat flux. Drizzle near the surface.

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COHERENT STRUCTURE OF DRIZZLE EVENTS

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  1. COHERENT STRUCTURE OF DRIZZLE EVENTS Chin-Hoh Moeng National Center for Atmospheric Research

  2. The RF02 Case • Display time: ~ hour 4.5 – hour 6 • Fields plotted: • Drizzle rate at ~ 4 m • Surface theta flux • theta fluctuation at ~ 4 m

  3. Surface heat flux Drizzle near the surface Temp near sfc

  4. SUMMARY of the standard case • only a few drizzle events • these drizzle/cold pool/large sfc fluxevents: • persistent • seem to move with the mean wind

  5. Why larger surface flux in cold pool area? u* fixed D sfc flux ~dT/u_1 u_1 uncorrelated sfc flux ~dT

  6. Case 2:RF02 with Ug=8m/s; Vg=0 • Compute u* --- MO theory • f = 0; no mean V • Display time: hr 3—hr 5.5 (every 400s)

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