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Understanding Cloud Fraction and Regimes in IWC Sampling Biases

This presentation delves into Cloud Fraction and Regimes, Ascent/Descent patterns, Boundary Layer Stability, IWC Sampling Bias summary, and alternative sampling strategies. The discussion covers various regimes based on stability levels and identifies significant biases in IWC sampling compared to cloud fraction.

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Understanding Cloud Fraction and Regimes in IWC Sampling Biases

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  1. Cloud fraction and IWC Malcolm Brooks, 19/10/04, Delft

  2. Contents The presentation covers the following sections • Cloud Fraction and Regimes • Ascent/Descent • Boundary Layer Stability • Summary of IWC Sampling Bias • Other Sampling Strategies • Leads into open discussion

  3. Regimes Ascent/Descent defined by splitting distritution of w into 1/3.

  4. Regimes Ascent/Descent defined by splitting distritution of w into 1/3.

  5. Regimes

  6. Regimes Ascent at 750hPA STABLE > > > > > > > > > > > > > > > NEUTRAL

  7. Regimes Descent at 750hPA STABLE > > > > > > > > > > > > > > > NEUTRAL

  8. IWC sampling biases CLOUD FRACTION IWC Sampling Biases of IWC much more significant than for Cloud fraction

  9. Effect of different Exclusion policies BLUE – do not exclude IWC based on surface rainrate RED – Exclude Surface rain rates > 0.5 mmhr-1 (from Chilbolton ’99-’00 period)

  10. Effect of different Exclusion policies Mid Level IWC (3-7km) BLUE – do not exclude IWC based on surface rainrate RED – Exclude Surface rain rates > 0.5 mmhr-1 (from Chilbolton ’99-’00 period)

  11. Effect of different Exclusion policies High Level IWC (7+ km) BLUE – do not exclude IWC based on surface rainrate RED – Exclude Surface rain rates > 0.5 mmhr-1 (from Chilbolton ’99-’00 period)

  12. Open Discussion OPEN DISCUSSION

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