MAP and IMPROVE II Experimental Areas

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MAP and IMPROVE II Experimental Areas
SHARE Workshop, Boulder, 5 May 2005
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2D Idealized WRF simulation of cross-barrier flow
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MAP IOP2b 20 September 1999
3h MEAN S-Pol RADAR DATA
STABILITY FROM MILAN SOUNDING
1 2 3 4 5 6
REFLECTIVITY
1 2 3 4 5 6
RADIAL VELOCITY
VERTICAL POINTING RADAR
Height (km)
REFLECTIVITY
FREQUENCY OCCURRENCE
1 2 3 4 5 6
Dry snow (50 ) Wet snow (30 ) Graupel - Shaded
RADIAL VELOCITY
120 90 60 30 0
Distance (km) from S-Pol radar
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MAP IOP2b 20 September 1999
3h MEAN S-Pol RADAR DATA
STABILITY FROM MILAN SOUNDING
1 2 3 4 5 6
REFLECTIVITY
1 2 3 4 5 6
RADIAL VELOCITY
VERTICAL POINTING RADAR
Height (km)
REFLECTIVITY
FREQUENCY OCCURRENCE
1 2 3 4 5 6
Dry snow (50 ) Wet snow (30 ) Graupel - Shaded
RADIAL VELOCITY
120 90 60 30 0
Distance (km) from S-Pol radar
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MAP IOP8 21 October 1999
3h MEAN S-Pol RADAR DATA
STABILITY FROM MILAN SOUNDING
1 2 3 4 5 6
REFLECTIVITY
1 2 3 4 5 6
RADIAL VELOCITY
VERTICAL POINTING RADAR
Height (km)
REFLECTIVITY
REFLECTIVITY
FREQUENCY OCCURRENCE
1 2 3 4 5 6
Dry snow (50 ) Wet snow (30 ) Graupel - Shaded
RADIAL VELOCITY
RADIAL VELOCITY
Graupel and/or dry aggregates Shaded
120 90 60 30 0
0600 0800 1000 1200
Distance (km) from S-Pol radar
Time (UTC) 21 Oct
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2D Idealized WRF simulation of cross-barrier
flow CASE 11
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IMPROVE II CASE 11 13-14 December 2001
3h MEAN S-Pol RADAR DATA
STABILITY FROM UW SOUNDING
1 2 3 4 5 6
REFLECTIVITY
1 2 3 4 5 6
RADIAL VELOCITY
VERTICAL POINTING RADAR
Height (km)
REFLECTIVITY (dBZ)
1 2 3 4 5 6
FREQUENCY OCCURRENCE
RADIAL VELOCITY (m/s)
Dry snow (50 ) Wet snow (30 ) Graupel - Shaded
Graupel and/or dry aggregates Shaded
2300 0000 0100 0200
0 25 50 75 100
Time (UTC) 13-14 Dec
Distance (km) from S-Pol radar
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IMPROVE II CASE 11 13-14 December 2001
Ice particle images obtained by NOAA P3
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IMPROVE II CASE 11 13-14 December
2001 Idealization
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JAMES AND HOUZE 05 Synoptic Situations
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JAMES AND HOUZE 05 Radar Climatology
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What to investigate in SHARE?Processes
affecting precipitation enhancement over windward
slope

• More stable cases
• Enhancement of low-level shear over windward
  slope in stable case
• Turbulence in shear layer over the windward slope
• Buoyancy, shear, terrain
• How turbulent overturning layer affects
  microphysical processes
• Aggregation, riming, coalescence
• Temperature feedback
• Less stable cases
• Enhanced lifting over small-scale individual
  peaks vs barrier scale
• Stable lifting at high Fr, or release of
  potential instability
• Microphysical processes over individual peaks
• Riming, aggregation, coalescence

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End
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IMPROVE II CASE 11 13-14 December 2001
NOAA P3 aircraft tail radar data
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IMPROVE II CASE 11 13-14 December 2001
Upstream sounding used in simulation
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Upstream-upslope rain gauge comparison
TOTALS Salem 10.24 Little Meadows 30.50