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Modeling of Sound Propagation in the Atmospheric Boundary Layer: Application of the MIUU Mesoscale Model
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
1999 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 104, no D10, 11891-11901 p.Article in journal (Refereed) Published
Abstract [en]

A mesoscale atmospheric model, the Meteorological Institute of Uppsala University model, has been used to simulate local wind and temperature profiles in an area with hilly terrain in eastern Norway. Simulated wind and temperature profiles (up to 250 m height above ground) have been used as input to an acoustical model, called Oases. In this way, sound propagation out to 1.4 km distance along ground has been determined for a site situated in a valley bottom in the center of the model domain. Measured ground conditions are also included in the acoustical model. During the investigated period, meteorological measurements were carried out in conjunction with measurements of low-frequency (≲100 Hz) impulse sound propagation out to a range of 1400 m along a flat, uniform, and snow-covered ground. For a case with geostrophic winds of the order of 25 m s-1 the predicted profiles are compared with profiles measured by meteorological towers and a tethered balloon launched at the site. Acoustic predictions based on both measured and simulated atmospheric profiles agree well with measured single-frequency sound levels in most cases. This suggests that forecasts of sound propagation using both a nested mesoscale atmospheric model and an acoustical model should be possible in future.

Place, publisher, year, edition, pages
1999. Vol. 104, no D10, 11891-11901 p.
National Category
Meteorology and Atmospheric Sciences
URN: urn:nbn:se:uu:diva-90527DOI: 10.1029/1999JD900016OAI: oai:DiVA.org:uu-90527DiVA: diva2:162910
Available from: 2003-05-16 Created: 2003-05-16 Last updated: 2013-05-30Bibliographically approved
In thesis
1. Mesoscale Simulations of Atmospheric Flow in Complex Terrain
Open this publication in new window or tab >>Mesoscale Simulations of Atmospheric Flow in Complex Terrain
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The MIUU mesoscale model was further developed, in order to include information on large-scale atmospheric fields from global or regional atmospheric climate- and weather-prediction models. For this purpose, a new lateral boundary condition was developed and implemented into the model. The new lateral boundary condition is a combination of two existing conditions, namely the flow relaxation scheme and the tendency modification scheme.

Tests indicated that an optimum lateral boundary configuration would be obtained with moderate to strong flow relaxation at higher levels, small flow relaxation at lower levels (within the atmospheric boundary layer), upstream advection at the outermost 4 grid points, and 6% horizontal grid stretching starting at a substantial distance from the lateral boundaries. The flow relaxation coefficients should be specified carefully, in order to minimize the reflection of all kinds of waves at the lateral boundaries.

The summer thermal low in the mean-sea-level pressure field over North America is traditionally analyzed over the northern end of the Gulf of California. The position of this low is influenced by the application of the so-called plateau correction in obtaining mean-sea-level pressure values from highly elevated stations in North America. A model study indicated that the low should be located approximately 450 km to the north and somewhat to the east of the above location.

A statistical comparison of model results from two mesoscale models against upper-air and surface measurements from several sites was carried out. Statistical methods, however, give only an insufficient picture of overall model performance. A comparison between predicted and measured tracer concentrations could be used to better evaluate the overall performance of different models.

Sound propagation in the atmosphere was predicted in a mountain valley using a mesoscale atmospheric model together with a sound propagation model. This suggests that forecasts of sound propagation should be possible in future.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 42 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 847
Meteorology, Mesoscale modeling, Flow in complex terrain, Atmospheric dispersion, Model comparison, Boundary conditions, Numerical modeling, Atmospheric pressure, Gravity waves, Meteorologi
National Category
Meteorology and Atmospheric Sciences
Research subject
urn:nbn:se:uu:diva-3461 (URN)91-554-5650-2 (ISBN)
Public defence
2003-06-06, SGU's lecture room, Sveriges Geologiska Undersökning (SGU), Uppsala, 13:00
Available from: 2003-05-16 Created: 2003-05-16Bibliographically approved

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Mohr, Hans Matthias
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