In Doppler radar analysis of the atmosphere the spectrum width is rarely used but it contains information about turbulence. Turbulence is not the only effect that contributes to the broadening of the spectrum. Another effect is the cross-beam wind, which can be dominant in broad-beam radars such as wind profilers. Once this effect is removed, the so-called residual width then serves as an indication of turbulence. A large snowstorm is used in this study for the computation of the residual width. Strong wind and wind shear were observed during the storm. The time-height pattern of residual width bears a close resemblance to that of wind shear. This supports the interpretation of the residual width as being an indication of turbulence induced by wind shear. Energy dissipation rates are also estimated for the snowstorm. In some regions values as large as 800 cm$ rm sp2 s sp{-3}$ are observed. These are large, but within the range of what has been reported by others. The same techniques were applied to the study of clear-air turbulence to relate radar reflectivity with turbulence.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.22755 |
| Date | January 1994 |
| Creators | Leblanc, Sylvain G. |
| Contributors | Rogers, R. R. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Atmospheric and Oceanic Sciences.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001445236, proquestno: MM05578, Theses scanned by UMI/ProQuest. |
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