Can water vapour process data be used to estimate precipitation efficiency?

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<jats:title>Abstract</jats:title><jats:p>The precipitation efficiencies (<jats:italic>RMPE, CMPE</jats:italic>, and <jats:italic>LSPE</jats:italic>) can be defined as the ratio of rain rate to rainfall sources in the rain microphysical budget, the cloud microphysical budget, and the surface rainfall budget, respectively. The estimate of <jats:italic>RMPE</jats:italic> from grid‐scale data serves as the true precipitation efficiency since the rain rate is a diagnostic term in the tropical rain microphysical budget. The accuracy of precipitation efficiency estimates with <jats:italic>CMPE</jats:italic> and <jats:italic>LSPE</jats:italic> is compared to that of <jats:italic>RMPE</jats:italic> by analyzing data from a 21‐day two‐dimensional cloud‐resolving model simulation with imposed large‐scale vertical velocity, zonal wind, and horizontal advection obtained from the Tropical Ocean Global Atmosphere Coupled Ocean–Atmosphere Response Experiment. The results show <jats:italic>CMPE</jats:italic> is generally smaller than <jats:italic>RMPE</jats:italic>. The root‐mean‐squared difference between <jats:italic>RMPE</jats:italic> and <jats:italic>LSPE</jats:italic> is larger than the standard deviation of <jats:italic>RMPE</jats:italic>. Thus, water vapour process data cannot be used to estimate precipitation efficiency. Copyright © 2011 Royal Meteorological Society</jats:p>

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