Preliminary Results from ICE-T
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Preliminary Results from ICE-T. Paul Lawson. Summary of Learjet ICE-T Missions Lear flew a total of 12 ICE-T Missions. 10 of the 12 Learjet Missions were in Conjunction with the C-130 and one (30 July) was a Coordinated Formation Flight.

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Preliminary Results from ICE-T

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Preliminary results from ice t

Preliminary Results from ICE-T

Paul Lawson


Preliminary results from ice t

Summary of Learjet ICE-T Missions

  • Lear flew a total of 12 ICE-T Missions.

  • 10 of the 12 Learjet Missions were in Conjunction with the C-130 and one (30 July) was a Coordinated Formation Flight.

  • Approximately 150 Penetrations of Cloud Turrets with Temperatures between +22 C and -24 C.

  • Most Cloud Penetrations were between 0 C and -20 C, with the Major Focus on the Region between -5 C and -20 C.


Preliminary results from ice t

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Preliminary results from ice t

Growing ICE-T Tropical Cumulus Clouds are Typically Mixed-Phase from about

– 10 C to – 20 C.

2D Images do Not have Sufficient Fidelity

to Separate

Water Drops from Ice Particles in ICE-T Clouds


Preliminary results from ice t

CPI Images at Same Time Show Low Concentration of Supercooled Drops

2D-S Images in Decaying Turret Appear to be All Ice (Rice Probe Indicates no SLWC)


Preliminary results from ice t

CPI Images at the Same Time Show Several Supercooled Drops (No Activity on Rice)

Another Example of 2D-S Images in the Middle of the Decaying Turret


Preliminary results from ice t

3V-CPI (CPI Portion) Images are used in Conjunction with 2D-S Image Data to Provide Quantitative Water Drop and Ice Particle Size Distributions

and Derived Quantities


Preliminary results from ice t

Examples of CPI Images in Mixed-Phase at -17 C


Preliminary results from ice t

Examples of CPI Images in Mixed-Phase at -17 C


Preliminary results from ice t

Examples of CPI Images in Mixed-Phase at -17 C


Preliminary results from ice t

Examples of CPI Images in Mixed-Phase at -17 C


Preliminary results from ice t

CPI Images in Mixed-Phase Automatically Separated into:

Water and Ice


Preliminary results from ice t

Particle Size Distributions from Various Probes


Preliminary results from ice t

Using CPI Automatic Image Recognition to Generate FFSSP 2D-S HVPS Water and Ice Size Distributions in Mixed-Phase


Preliminary results from ice t

Example Comparison of Lear and C-130

in situ Measurements with Remote Observations

  • Shown are Results from a Cloud Penetration when the Learjet flew in trail about 400 m beneath the C-130. The purpose was to compare C-130 UW cloud radar with Lear in situ measurements.

  • The C-130 Entered 11-s Ahead of the Lear in a Rising Turret with strong updraft and mostly SLW followed by an older decaying mixed-phase region that transitions to mostly ice. The two types of cloud can be seen in the Lear cockpit video photos. The CPI part of the Lear 3CV-CPI* malfunctioned during this cloud penetration and no images are available, so the absence of cloud drops cannot be confirmed in the mixed-phase cloud.

    * The 3V-CPI was made available courtesy of the US Navy Center for Interdisciplinary Remotely Piloted Aircraft Studies


Preliminary results from ice t

Lear (purple) and C-130 (yellow) Flight Tracks During Coordinated Penetrations on 30 July 2011


Preliminary results from ice t

Lear Cockpit Time-Lapse Photos Showing Rising Turret and Older Cloud Behind that C-130 Penetrated and Lear Penetrated 11-s later and 1,500 ft Below C-130


Preliminary results from ice t

2D-S Images of Supercooled Drops in Turret Updraft


Preliminary results from ice t

2D-S Images of Ice Particles in the Old Cloud Region


Preliminary results from ice t

C-130 UW Cloud Radar Data for 1726 Cloud Penetration


Preliminary results from ice t

Lear and C-130 3V-CPI Particle Size Distributions


Preliminary results from ice t

First Ice in Tropical Cumulus Clouds

Paul Lawson


Preliminary results from ice t

A Simple Methodology to Analyze First Ice

Automatically categorize water drops and ice crystals for each cloud penetration with working CPI data.

Classify clouds having number concentrations of < 2% ice crystals with a mean size < 50 µm as being those containing first ice.

Evaluate the amount and type of first ice as a function of cloud temperature, updraft speed, aerosols, cloud appearance, etc.

Caveats

  • Care must be taken not to include old cloud fragments outside of growing turrets

  • Care must be taken to correct any misclassified water drops and ice particles.


Preliminary results from ice t

Example of First Ice Observed by Learjet

in Cloud at -12 C

on 11 July from 190615 – 190625…


Preliminary results from ice t

All Water Drops Observed during First 7 s of Cloud Penetration

(One Second – about 300 images: 190615.6 – 190616.6 shown below)


Preliminary results from ice t

190616.6 – 190617 and 190618 – 190618.6 shown below

…then skip 5 –s


Preliminary results from ice t

First Ice at -12 C Observed at 190623


Preliminary results from ice t

More Examples of First Ice at -12 C


Preliminary results from ice t

Particle Size Distributions from Various Probes


Preliminary results from ice t

Composite Water Drop Size Distribution from FFSSP, 2D-S, & HVPS and CPI Images of First Ice (1.3% of total particles) at – 12 C


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