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Estimation of gravity wave momentum flux with spectroscopic imaging / J. Tang in IEEE Transactions on geoscience and remote sensing, vol 43 n° 1 (January 2005)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 43 n° 1 (January 2005) . - pp 103 - 109 Titre : Estimation of gravity wave momentum flux with spectroscopic imaging Type de document : Article/Communication Auteurs : J. Tang, Auteur ; F. Kamalabadi, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 103 - 109 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] analyse spectrale [Termes IGN] effet atmosphérique [Termes IGN] extraction [Termes IGN] perturbation [Termes IGN] rayonnement électromagnétique [Termes IGN] spectroscopie Résumé : (Auteur) Atmospheric gravity waves play a significant role in the dynamics and thermal balance of the upper atmosphere. In this paper, we present a novel technique for automated and robust calculation of momentum flux of high-frequency quasi-monochromatic wave components from spectroscopic imaging and horizontal radar wind measurements. Our approach uses the two-dimensional (2-D) cross periodogram of two consecutive Doppler-shifted time-differenced (TD) images to identify wave components and estimate intrinsic wave parameters. Besides estimating the average perturbation of dominant waves in the whole field of view, this technique applies 2D short-space Fourier transform to the TD images to identify localized wave events. With the wave parameters acquired, the momentum flux carried by all vertically propagating wave components is calculated using an analytical model relating the measured intensity perturbation to the wave amplitude. This model is tested by comparing wave perturbation amplitudes inferred from spectroscopic images with those from sodium lidar temperature measurements. The proposed technique enables characterization of the variations in the direction and strength of gravity waves with high temporal resolution for each clear data-taking night. The nightly results provide statistical information for investigating seasonal and geographical variations in momentum flux of gravity waves. Numéro de notice : A2005-059 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.836268 En ligne : https://doi.org/10.1109/TGRS.2004.836268 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27197 [article]

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