cloud fraction and iwc
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© Crown copyright 2004 Page 1
Cloud fraction and IWC
Malcolm Brooks, 19/10/04, Delft
© Crown copyright 2004 Page 2
Contents
Cloud Fraction and RegimesAscent/DescentBoundary Layer Stability
Summary of IWC Sampling BiasOther Sampling Strategies
Leads into open discussion
The presentation covers the following sections
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Regimes
Ascent/Descent defined by splitting distritution of w into 1/3.
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Regimes
Ascent/Descent defined by splitting distritution of w into 1/3.
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Regimes
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Regimes
Ascent at 750hPA
STABLE > > > > > > > > > > > > > > > NEUTRAL
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Regimes
Descent at 750hPA
STABLE > > > > > > > > > > > > > > > NEUTRAL
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IWC sampling biases
CLOUD FRACTION IWC
Sampling Biases of IWC much more significant than for Cloud fraction
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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)
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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)
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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)
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Open Discussion
OPEN DISCUSSION
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