Correlations of the evolution of a CCOPE squall line with surface thermodynamics and kinematic fields |
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| Authors: | Xu Yumao and J C Fankhauser |
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| Institution: | (1) Department of Atmospheric Sciences, Nanjing University, Nanjing;(2) National Center for Atmospheric Research, P.O. Box 3000, 80307 Boulder, Colorado, USA |
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| Abstract: | A midlatitude squall line passed over the array of the Cooperative Convective Precipitation Experiment (CCOPE) on 1 August
1981. The structure and evolution of the squall line, and the correlations of the storm with surface thermodynamics and kinematic
fields are investigated, mainly by using radar and surface mesonet data in CCOPE. The storm-wide precipitation efficiency
is also estimated.
The squall line was of an obvious process of metabolism. Thirty-four cells formed successively in front of the primary storm
and eventually merged into it during the period 1700-2010 MDT. The newest cells formed near surface equivalent potential temperature
maxima, and near surface moisture flux convergence zones or/ and the “temperature break lines”. The thunderstorm rainfall,
with the precipitation efficiency of 54%, lags 25-30 min behind the moisture flux convergence on the average. |
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