coherent structure of drizzle events chin-hoh moeng national center for atmospheric research
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COHERENT STRUCTURE OF DRIZZLE EVENTS
Chin-Hoh Moeng
National Center for Atmospheric Research
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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
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Drizzle near the surface Surface heat flux
Temp near sfc
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SUMMARY of the standard case
• only a few drizzle events• these drizzle/cold pool/large sfc flux
events:– persistent– seem to move with the mean wind
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Why larger surface flux in cold pool area?
u_1 uncorrelated
sfc flux ~dT
u* fixed' 'w
1
sfc flux ~dT/u_1
D
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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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Vertical cross-section
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D w
th qt
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Summary-1
• Drizzle events move with wind
- U_mean – U_gal ~ 3 m/s
- about 1 km every 400s
- last longer than 1.5 hours!
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near-surface plane view again
larger sfc flx~ smaller phim~ smaller u_1
sfc flx ~ dT/u_1
MO theory
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Summary-2
• Cold pool ~ larger sfc heat flux
- not an artifact of a fixed u*
- but is it a robust feature?
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Case 3:
Ug=0.5m/s; Vg=0
Very weak wind
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Hour 1
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Hour 2
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Hour 3
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Hour 3.5
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For the very weak wind case:
Cold pool ~ smaller surface flux !
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Why smaller surface flux in cold pool area?
u_1 larger in cold pool
sfc flux ~ 1/u_1
' '0w
1
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Case 2:strong wind Case 3: weak wind
cold pool~ large u_1??
?
•circulation flow?•density-current dynamics?
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SUMMARY-1
• Drizzle events are rare/intermittent;
due to merger of cold pools?
• Cold pool may associate with either
larger or smaller surface heat flux
(Observations?)
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SUMMARY-2
• If cold pool ~ larger sfc flx, drizzle events are larger and last longer (1-2 hours):
drizzle cold pool larger sfc flux
updrafts more drizzle
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with rain: solid lines
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with rain, ug=8 m/s
with rain, standard ug,vg
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