On the Definition of Precipitation Efficiency | Zendy

ChungHsiung Sui | Zendy; Xiaofan Li | Zendy; MingJen Yang | Zendy

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On the Definition of Precipitation Efficiency

Author(s) -

ChungHsiung Sui,

Xiaofan Li,

MingJen Yang

Publication year - 2007

Publication title -

journal of the atmospheric sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.853

H-Index - 173

eISSN - 1520-0469

pISSN - 0022-4928

DOI - 10.1175/2007jas2332.1

Subject(s) - precipitation , atmosphere (unit) , environmental science , water vapor , atmospheric sciences , scale (ratio) , climatology , range (aeronautics) , moisture , meteorology , geology , materials science , physics , quantum mechanics , composite material

A modified definition of precipitation efficiency (PE) is proposed based on either cloud microphysics precipitation efficiency (CMPE) or water cycling processes including water vapor and hydrometeor species [large-scale precipitation efficiency (LSPE)]. These PEs are examined based on a two-dimensional cloudresolving simulation. The model is integrated for 21 days with the imposed large-scale vertical velocity, zonal wind, and horizontal advections obtained from the Tropical Ocean Global Atmosphere Coupled Ocean–Atmosphere Response Experiment (TOGA COARE). It is found that the properly defined PEs include all moisture and hydrometeor sources associated with surface rainfall processes so that they range from 0% to 100%. Furthermore, the modified LSPE and CMPE are highly correlated. Their linear correlation coefficient and root-mean-squared difference are insensitive to the spatial scales of averaged data and are moderately sensitive to the time period of averaged data.

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