Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/12374
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DC Field | Value | Language |
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dc.contributor.author | Forbes, J. | - |
dc.contributor.author | Kilpatrick, M. | - |
dc.contributor.author | Fritts, D. | - |
dc.contributor.author | Manson, A. | - |
dc.contributor.author | Vincent, R. | - |
dc.date.issued | 1997 | - |
dc.identifier.citation | Annales Geophysicae: atmospheres, hydrospheres and space sciences, 1997; 15(9):1158-1164 | - |
dc.identifier.issn | 0992-7689 | - |
dc.identifier.issn | 1432-0576 | - |
dc.identifier.uri | http://hdl.handle.net/2440/12374 | - |
dc.description.abstract | Interpretations of space-based measurements of atmospheric parameters in the mesosphere and thermosphere are complicated by large local-time variations at these altitudes. For this reason, satellite orbits are often preferred which precess through all local times one or more times per season. However, the local-time structure of the atmosphere is inherently non-stationary, which can lead to sampling and aliasing difficulties when attempting to deconvolve the measurements into zonal mean and tidal components. In the present study, hourly radar measurements of mesopause-region winds are used to form a mock data base which can be used to gain insight into implications of the aforementioned problems; the use of actual measurements introduces a realistic element of geophysical temporal variability. Assuming zonal symmetry (i.e., migrating tides superimposed on a zonal mean circulation), the radar measurements are sampled from the satellite perspective for orbital inclinations of 57° and 70°, and compared to the ground or true perspective. These comparisons provide realistic estimates of the errors to be expected when attempting to derive mean and tidal components from space-based measurements. For both diurnal and semidiurnal components, and the quoted satellite inclinations, acceptable errors (3–4m/srms) are obtained for data covering 24h local time (i.e., ascending plus descending nodes); the corresponding errors for single-node data (12h local-time coverage) are of order 8–11m/s, and therefore may not represent reliable estimates of the actual tidal components. There exist certain caveats in connection with the latter conclusion which are discussed. | - |
dc.language.iso | en | - |
dc.publisher | European Geosciences Union | - |
dc.source.uri | http://www.ann-geophys.net/15/1158/1997/ | - |
dc.title | Zonal mean and tidal dynamics from space: An empirical examination of aliasing and sampling issues | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1007/s005850050533 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Vincent, R. [0000-0001-6559-6544] | - |
Appears in Collections: | Aurora harvest 7 Physics publications |
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hdl_12374.pdf | 890.38 kB | Publisher's PDF | View/Open |
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