Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/12374
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dc.contributor.authorForbes, J.en
dc.contributor.authorKilpatrick, M.en
dc.contributor.authorFritts, D.en
dc.contributor.authorManson, A.en
dc.contributor.authorVincent, R.en
dc.date.issued1997en
dc.identifier.citationAnnales Geophysicae, 1997; 15(9):1158-1164en
dc.identifier.issn0992-7689en
dc.identifier.issn1432-0576en
dc.identifier.urihttp://hdl.handle.net/2440/12374-
dc.description.abstractInterpretations 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.en
dc.language.isoenen
dc.publisherEuropean Geosciences Unionen
dc.source.urihttp://www.ann-geophys.net/15/1158/1997/en
dc.titleZonal mean and tidal dynamics from space: An empirical examination of aliasing and sampling issuesen
dc.typeJournal articleen
dc.identifier.rmid0030004019en
dc.identifier.doi10.1007/s00585-997-1158-zen
dc.identifier.pubid68025-
pubs.library.collectionPhysics publicationsen
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidVincent, R. [0000-0001-6559-6544]en
Appears in Collections:Physics publications

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