CPI and 3V-CPI Imagery at Storm Peak LabCPI and 3V-CPI Imagery at Storm Peak Lab

Paul Lawson Jay Mace Paul Lawson Jay Mace SPEC Incorporated University of UtahSPEC Incorporated University of Utah

CPI Installed at Storm Peak Lab CPI Installed at Storm Peak Lab

(Remained free of Rime Ice)(Remained free of Rime Ice)

3V-CPI Replaced CPI in February 20113V-CPI Replaced CPI in February 2011

3V-CPI Electro-optics3V-CPI Electro-optics

3V-CPI Characteristics3V-CPI Characteristics

Combines CPI and 2D-S probes, which doubles as the particle detection system for the CPI imaging camera.

2D-S reduces uncertainties in CPI size distribution. Can use wind speed measurements from SPL annemometer or 2D-S particle transit time measurements.

Identification of water drops and ice crystals is done using CPI imagery. 2D-S measurements are then used to quantitatively determine water and ice size distributions.

Software development to produce separate water and ice size distributions is under development (currently not in existence).

Following Example Shows how CPI (and Following Example Shows how CPI (and 3V-CPI) Images can be used Qualitatively 3V-CPI) Images can be used Qualitatively

to Identify Regions of Water, Mixed-to Identify Regions of Water, Mixed-Phase and Ice Regions of Cloud Phase and Ice Regions of Cloud

Water Drops

Water

Ice

Ice/Water

Water Drops

Water

Ice

Ice/Water

Mixed

Water Drops

Water

Ice

Ice/Water

Mixed

Water

Water Drops

Water

Ice

Ice/Water

Mixed

Water

Mixed

Water Drops

Water

Ice

Ice/Water

Mixed

Water Ice

Mixed

Water Drops

Water

Ice

Ice/Water

Mixed

Water Ice Water Drops

Mixed

Data Processing SchemeData Processing Scheme CPI Images will be placed in the archive shortly CPI Images will be placed in the archive shortly

following the close of StormVex.following the close of StormVex.

The Water/Mixed/Ice time series product will follow.The Water/Mixed/Ice time series product will follow.

Algorithm to Detect Riming CPI Images may be Algorithm to Detect Riming CPI Images may be PossiblePossible

2D-S data will take longer yet to process. 2D-S data will take longer yet to process.

Combined CPI/2D-S Data Products will be Available Combined CPI/2D-S Data Products will be Available sometime within a year following the close of sometime within a year following the close of StormVexStormVex..