Abstract
Abstract The relative contributions of the different processes involved in the water budget of the 22 June 1981 tropical squall line are investigated. The kinematic and thermodynamic fields derived from Doppler radar data are used to calculate the sources and sinks of condensate in the convective and trailing stratiform regions of the system. Both regions play an important role in providing the surface rain. Fifty-five to 65% of the total rain precipitated at the surface is convective, while the remaining 35–45% is supplied by the trailing stratiform cloud. This partition corresponds to a precipitation efficiency of 47–57% for the convective region, and 45-57% for the stratiform region. Though these efficiencies are of the same order of magnitude, the sink of water substance in each region (before reaching the surface) is attributable to different processes. In the convective region, low of water substance is mainly due to the transfer of condensate into the trailing anvil cloud. This transfer represents ...
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