SPEC%20CPI%20Demonstration

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Microphysics of SPARTICUS and MacPex Clouds
Paul Lawson
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Comparison of WB-57 and Lear Microphysics
Measurements During Coordinated Flight Through
Cirrus on 18 April 2011
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Measurements from Lear and WB-57 Cloud Particle
Probes During In-Trail Comparison
Flight
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Measurements from Lear and WB-57 Cloud Particle
Probes During In-Trail Comparison
Flight
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SPARTICUS Profile In Thin, Warm Cirrus
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SPARTICUS Profile In Thin, Warm Cirrus
SPARTICUS Profile In Cold, Thick Cirrus
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SPARTICUS Learjet Flight Through Anvil over SGP
on 15 June 2010
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Learjet made 8 Passes Stepping up from FL250 (-
20 C) to FL 380 (-52 C)
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CPI Images at FL250 (-20 C) lt--------gt
1 mm
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CPI Images at FL250 (-20 C) lt--------gt
1 mm
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2D-S Images at FL250 (-20 C) lt-----gt
1 mm
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HVPS Images at FL250 (-20 C) lt----gt
1 cm
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CPI Images at FL310 (-33 C) lt--------gt
1 mm
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2D-S Images at FL310 (-33 C) lt-----gt
1 mm
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HVPS Images at FL310 (-33 C) lt----gt
1 cm
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CPI Images at FL380 -52 C lt--------gt
1 mm
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2D-S Images at FL380 (-52 C) lt-----gt
1 mm
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HVPS Images at FL380 (-52 C) lt----gt
1 cm
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Summary

1. 2D-S measurements in SPARTICUS and MacPex appear
   to be reliable. Horizontal and vertical channels
   are in good agreement. Based on one comparison,
   both WB-57 2D-S and HVPS particle concentrations
   are slightly lower than Lear, but time
   differential in cloud penetration may explain
   difference.
2. HVPS concentration measurements appear to be
   lower relative to 2D-S in MacPex. HVPS
   concentrations in both SPARTICUS and MacPex (and
   2D-P in SPARTICUS) appear to be lower than 2D-S
   when max particle size lt 1 to 2 mm.
3. SPEC FCDP concentration measurements in MacPex
   are in phase with 2D-S small particle
   measurements, but lower concentration values and
   PSDs are suspect. DMT CDP measurements in
   SPARTICUS (when the probe appears to be working)
   are in phase but much higher than 2D-S. PSDs
   are suspect.
4. Users are STRONGLY ENCOURAGED to plot PSDs from
   each probe and examine overlap to determine
   suitability before using or combining PSDs for
   analysis.