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2B-CWC-RVOD 008 issue

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Issue:Radar forward model attenuation in liquid cloud

Opened:09/21/11 7:48 pmSubmitted by:Norm Wood
Severity:MAJOR Planned resolution: TBD


Description
The 2B-CWC-RVOD algorithm estimates liquid cloud properties using a radar forward model which includes the effects of attenuation by liquid cloud droplets. An error related to the calculation of the attenuation has been identified in the forward model. Due to a sign error, values for the two-way transmission in the forward model may be larger than 1.0. As a result, the forward-modeled attenuated reflectivity values can be larger than the unattenuated values.



An evaluation shows that effective radii and liquid water contents are typically underestimated by the retrieval as a result of the forward model error. These effects are most pronounced for those profiles containing dBZe > -15 (i.e., those profiles which likely contain precipitation).



This forward model is also used in the 2B-CWC-RO algorithm. The forward model is being corrected as part of the R05 product release. Note that this issue does not affect retrieved ice cloud properties.

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