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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.

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Presentation Transcript

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




SPARTICUS Profile During In-Trail Comparison Flight

In Thin, Warm Cirrus


SPARTICUS Profile During In-Trail Comparison Flight

In Thin, Warm Cirrus

SPARTICUS Profile

In Cold, Thick Cirrus


SPARTICUS Learjet Flight Through Anvil over SGP During In-Trail Comparison Flight

on 15 June 2010


Learjet made 8 Passes Stepping up from During In-Trail Comparison Flight

FL250 (- 20 C) to FL 380 (-52 C)


CPI Images at FL250 (-20 C) During In-Trail Comparison Flight<-------->

1 mm


CPI Images at FL250 (-20 C) During In-Trail Comparison Flight<-------->

1 mm


2D-S Images at FL250 (-20 C) During In-Trail Comparison Flight<----->

1 mm


HVPS Images at FL250 (-20 C) During In-Trail Comparison Flight<---->

1 cm


CPI Images at FL310 (-33 C) During In-Trail Comparison Flight<-------->

1 mm


2D-S Images at FL310 (-33 C) During In-Trail Comparison Flight<----->

1 mm


HVPS Images at FL310 (-33 C) During In-Trail Comparison Flight<---->

1 cm


CPI Images at FL380 -52 C During In-Trail Comparison Flight<-------->

1 mm


2D-S Images at FL380 (-52 C) During In-Trail Comparison Flight<----->

1 mm


HVPS Images at FL380 (-52 C) During In-Trail Comparison Flight<---->

1 cm


Summary During In-Trail Comparison Flight

  • 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.

  • 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.

  • 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.

  • Users are STRONGLY ENCOURAGED to plot PSD’s from each probe and examine overlap to determine suitability before using or combining PSD’s for analysis.


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