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Considerations for Comparing Cloud Particle Data with Remote Measurements and Model Results

This document explores key considerations when comparing cloud particle data obtained from various instruments like 2D-S and CAPS with remote measurements and model results. It discusses the accuracy of different probes, highlighting how CAS can introduce artifacts due to splashing and shattering of particles. Important insights include the potential undercounting of particles smaller than 100 µm by CIP and the necessity for software corrections to account for the influence of large ice particles on measurement data. Understanding these factors is crucial for enhancing data reliability in radar retrievals.

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Considerations for Comparing Cloud Particle Data with Remote Measurements and Model Results

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  1. Some Information to Consider Before Comparing Cloud Particle Data with Remote Measurements and Model Results Paul Lawson, Bryan Pilson, Brad Baker, Qixu Mo NAMMA Workshop Washington, D.C. 15 -17 May 2007

  2. 2D-S and CAPS (CAS + CIP + PIP) Agree Well In Cu with Drop Diameters < 100 mm (CIP and PIP Inactive)

  3. Comparison of 2D-S and CAPS in Cloud with Rain Suggests that CAS Sees Artifacts from Splashing

  4. Comparison of 2D-S & CAPS in Cloud with Large Ice Suggests that CAS Sees Artifacts from Shattering

  5. Comparison of 2D-S & CAPS Mass Distributions in Cloud with Large Ice

  6. Some Points to Consider • CIP may miss particles < 100 m. (CIP particles recorded in this size range are likely larger particles that are mis-sized.) • Large ice (rain) appear to shatter (splash) on the inlets of ALL particle probes and have to be removed in software using particle arrival time. CAS artifacts cannot be reliably removed and significantly increase extinction and mass PSD’s • Users should examine images from both the CAPS and 2D-S to see if shattered and splashed particles also artificially increase the large tail of the PSD (may be significant in radar retrievals). • CAS PSD < 10 m and PIP PSD > ~ 2 mm should be combined with the 2D-S to obtain a complete PSD.

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