Author

Liqun Du

Publication Date

1993

Document Type

Dissertation/Thesis

First Advisor

ReVelle, Douglas O.

Degree Name

M.S. (Master of Science)

Department

Department of Geography

LCSH

Planetary boundary layer||Micrometeorology||Dynamic meteorology||Turbulent diffusion (Meteorology)

Abstract

A theoretical study of the "bursting" phenomena of the planetary boundary layer (PBL) has been carried out using a modified one dimensional, "flat" terrain, PBL model. Sensitivity tests show that the "bursting" only occurs in a very narrow range of geostrophic wind (2 - 3.5 m/s). The detailed behavior is found to be very sensitive to the initial conditions. A special experiment was performed at the Environmental Research Division of Argonne National Laboratory from August to early November 1992. Vertical velocity and signal intensity data and temperature, wind speed, net radiation, and relative humidity data were obtained with a minisodar and a meteorological tower, respectively. Examples of weak, strong, and multiple bursting phenomena are presented and discussed. The modified one dimensional PBL model is utilized to compare the observational data against a theoretical prediction of the "bursting" event. From the comparison we conclude that this model has the ability to predict some aspects of the "bursting" phenomena in the stable nocturnal boundary layer. The predicted air temperature is close to the observed air temperature while the predicted wind speed magnitude is predicted relatively poorly in comparison.

Comments

Includes bibliographical references (pages [132]-138)

Extent

xii, 138 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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