MAP and IMPROVE II Experimental Areas SHARE Workshop, Boulder, 5 May 2005.

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Presentation transcript:

MAP and IMPROVE II Experimental Areas SHARE Workshop, Boulder, 5 May 2005

2D Idealized WRF simulation of cross-barrier flow

Distance (km) from S-Pol radar Height (km) MAP IOP2b – 20 September h MEAN S-Pol RADAR DATA REFLECTIVITY RADIAL VELOCITY FREQUENCY OCCURRENCE dBZ m/s % STABILITY FROM MILAN SOUNDING VERTICAL POINTING RADAR Time (UTC) 20 Sep REFLECTIVITY RADIAL VELOCITY Height (km) Dry snow (50 %) Wet snow (30 %) Graupel - Shaded

Distance (km) from S-Pol radar Height (km) MAP IOP2b – 20 September h MEAN S-Pol RADAR DATA REFLECTIVITY RADIAL VELOCITY FREQUENCY OCCURRENCE dBZ m/s % STABILITY FROM MILAN SOUNDING VERTICAL POINTING RADAR Time (UTC) 20 Sep REFLECTIVITY RADIAL VELOCITY Height (km) Dry snow (50 %) Wet snow (30 %) Graupel - Shaded

Distance (km) from S-Pol radar Height (km) MAP IOP8 – 21 October h MEAN S-Pol RADAR DATA REFLECTIVITY RADIAL VELOCITY FREQUENCY OCCURRENCE dBZ m/s % STABILITY FROM MILAN SOUNDING Dry snow (50 %) Wet snow (30 %) Graupel - Shaded Graupel and/or dry aggregates – Shaded VERTICAL POINTING RADAR REFLECTIVITY RADIAL VELOCITY Time (UTC) 21 Oct Height (km) REFLECTIVITY RADIAL VELOCITY P3 RADIAL VELOCITY

2D Idealized WRF simulation of cross-barrier flow CASE 11

Distance (km) from S-Pol radar Height (km) IMPROVE II CASE 11 – December h MEAN S-Pol RADAR DATA REFLECTIVITY RADIAL VELOCITY FREQUENCY OCCURRENCE dBZ m/s % STABILITY FROM UW SOUNDING Dry snow (50 %) Wet snow (30 %) Graupel - Shaded Graupel and/or dry aggregates – Shaded VERTICAL POINTING RADAR Time (UTC) Dec Height (km) RADIAL VELOCITY (m/s) REFLECTIVITY (dBZ)

IMPROVE II CASE 11 – December 2001 Ice particle images obtained by NOAA P3

IMPROVE II CASE 11 – December 2001 Idealization

JAMES AND HOUZE ‘05 Synoptic Situations

JAMES AND HOUZE ‘05 Radar Climatology

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

End

IMPROVE II CASE 11 – December 2001 NOAA P3 aircraft tail radar data

IMPROVE II CASE 11 – December 2001 Upstream sounding used in simulation

Upstream-upslope rain gauge comparison SalemLittle Meadows TOTALS Salem: 10.24” Little Meadows: 30.50”