Gravity wave spectra morphology in the Arctic and non-Arctic lower atmosphere
The spectral analysis of data from three VHF radars (one high-Arctic and two mid-latitudes) show support for the universal spectrum theory for gravity waves in the lower atmosphere (altitudes of 2.0-11.0 km), provided that the impact of the off-vertical beam and noise are taken into consideration. T...
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| Format: | Text |
| Language: | English |
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Scholarship@Western
2014
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| Online Access: | https://ir.lib.uwo.ca/etd/2520 https://ir.lib.uwo.ca/context/etd/article/3961/viewcontent/Wright__Mel_thesis_new.pdf |
| Summary: | The spectral analysis of data from three VHF radars (one high-Arctic and two mid-latitudes) show support for the universal spectrum theory for gravity waves in the lower atmosphere (altitudes of 2.0-11.0 km), provided that the impact of the off-vertical beam and noise are taken into consideration. This analysis also reveals that local gravity wave generation is of secondary importance, but still significant for determining the spectra. A total of eight spectral methods were considered and scrutinized for the purposes of determining gravity wave spectra from VHF radar data. A definition for the “best” method was given and examined. The method selected as the “best” for the analysis presented was a date-compensated discrete Fourier transform with a Hamming window. |
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