Evaluation of a Turbulent Mixing Length Parameterization Applied to the Case of an Approaching Upper-Tropospheric Trough
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Authors
Miller, Douglas K.
Walters, Donald L.
Slavin, Ann
Subjects
Advisors
Date of Issue
2001
Date
2001
Publisher
Language
Abstract
The challenge of simulating a realistic evolution of
optical turbulence in the stable, free atmosphere,
even under the conditions of a strong jet-streak, by
a state-of-the-art mesoscale model has been
documented by Walters and Miller (1999). In the
case presented, Walters and Miller (1999) showed
that a modification of the shear and buoyancy
contributions to the simulated turbulent kinetic
energy (TKE) using a Mellor-Yamada 2.5
parameterization (Mellor and Yamada 1974, 1982;
Yamada 1975) resulted in model predictions which
had more realistic TKE magnitudes when
compared to radar, balloon, and wind tunnel
measurements. What has yet to be investigated is
the sensitivity of the modified version of the
Bougeault and Lacarrere (1989) mixing length
parameterization to initial conditions and to model
vertical and horizontal resolution. The sensitivity
of simulated TKE will be the focus of this study
under the conditions of low and moderate
turbulence which occurred with the approach of a
cut-off low pressure system on 18 April 2000 over
Albuquerque, New Mexico. The numerical
experiments generating the results for this study
will be defined in Section 2, the synoptic
conditions and actual integrated optical turbulence
measurements for the 18 April case study will be
presented in Section 3, preliminary model results
will be given in Section 4, and a summary of the
study will be made in Section 5.
Type
Conference Paper
Description
Extended Abstract
Series/Report No
Department
Meteorology
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Department of Defense High Performance Computing Modernization Program
Funder
Format
5 p.
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.