Numerical simulation of a squall line: Tests of a new cumulus parameterization scheme
Abstract
A new cumulus parameterization scheme (CPS) is developed and tested. The CPS includes a cloud model that is shown to favorably replicate mass, moisture and heat fluxes calculated by a time dependent non-hydrostatic three-dimensional cloud model. The CPS was tested semi-prognostically with SESAME V data and the Q1 and Q2 values diagnosed by the CPS compare very favorably to those observed. This is true for comparisons at all convectively active grid points. The CPS is incorporated into the Purdue mesoscale model to simulate the SESAME IV squall line. The resulting simulation captures many of the observed features of this case including the backing of the low-level wind out ahead of the dryline and initial formation of the squall line in the Texas panhandle. It also shows the dryline moving westward at night as observed and shows the later extension of the squall line to the south.
Degree
Ph.D.
Advisors
Sun, Purdue University.
Subject Area
Atmosphere
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