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Microphysics of
SPARTICUS and
MacPex Clouds
Paul Lawson
Comparison of WB-57 and Lear Microphysics
Measurements
During Coordinated Flight Through Cirrus on 18 April 2011
Measurements from Lear and WB-57 Cloud Particle Probes
During In-Trail Comparison Flight
Measurements from Lear and WB-57 Cloud Particle Probes
During In-Trail Comparison Flight
SPARTICUS Profile
In Thin, Warm Cirrus
SPARTICUS Profile
In Thin, Warm Cirrus
SPARTICUS Profile
In Cold, Thick Cirrus
SPARTICUS Learjet Flight Through Anvil over SGP
on 15 June 2010
Learjet made 8 Passes Stepping up from
FL250 (- 20 C) to FL 380 (-52 C)
CPI Images at FL250 (-20 C) <-------->
1 mm
CPI Images at FL250 (-20 C) <-------->
1 mm
2D-S Images at FL250 (-20 C) <----->
1 mm
HVPS Images at FL250 (-20 C) <---->
1 cm
CPI Images at FL310 (-33 C) <-------->
1 mm
2D-S Images at FL310 (-33 C) <----->
1 mm
HVPS Images at FL310 (-33 C) <---->
1 cm
CPI Images at FL380 -52 C <-------->
1 mm
2D-S Images at FL380 (-52 C) <----->
1 mm
HVPS Images at FL380 (-52 C) <---->
1 cm
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 < ~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 PSD’s are suspect. DMT CDP measurements in SPARTICUS (when the probe appears to be working) are in phase but much higher than 2D-S. PSD’s are suspect.
4. Users are STRONGLY ENCOURAGEDSTRONGLY ENCOURAGED to plot PSD’s from each probe and examine overlap to determine suitability before using or combining PSD’s for analysis.
SummarySummary
