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Observational indications of downward-propagating gravity waves in middle atmosphere lidar data

Kaifler, Natalie und Kaifler, Bernd und Ehard, Benedikt und Gisinger, Sonja und Dörnbrack, Andreas und Rapp, Markus und Kivi, Rigel und Kozlovsky, Alexander und Lester, M. und Liley, Ben (2017) Observational indications of downward-propagating gravity waves in middle atmosphere lidar data. Journal of Atmospheric and Solar-Terrestrial Physics, Seiten 1-40. DOI: 10.1016/j.jastp.2017.03.003 ISSN 1364-6826

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Offizielle URL: http://www.sciencedirect.com/science/article/pii/S1364682617301475

Kurzfassung

Two Rayleigh lidars were employed at a southern-hemisphere mid-latitude site in New Zealand (45 °S) and a northern-hemisphere high-latitude site in Finland (67 °N) in order to observe gravity waves between 30 and 85 km altitude under wintertime conditions. Two-dimensional wavelet analysis is used to analyze temperature perturbations caused by gravity waves and to determine their vertical wavelengths and phase progression. In both datasets, upward phase progression waves occur frequently between 30 and 85 km altitude. Six cases of large-amplitude wave packets are selected which exhibit upward phase progression in the stratosphere and/or mesosphere. We argue that these wave packets propagate downward and we discuss possible wave generation mechanisms. Spectral analysis reveals that superpositions of two or three wave packets are common. Furthermore, their characteristics often match those of upward-propagating waves which are observed at the same time or earlier. In the dataset means, the contribution of upward phase progression waves to the potential energy density Ep is largest in the lower stratosphere above Finland. There, Ep of upward and downward phase progression waves is comparable. At 85 km one third of the potential energy carried by propagating waves is attributed to upward phase progression waves. In some cases Ep of upward phase progression waves far exceeds Ep of downward phase progression waves. The downward-propagating waves might be generated in situ in the middle atmosphere or arise from reflection of upward-propagating waves.

ID-Nummer des Eintrags:111473
Dokumentart:Zeitschriftenbeitrag
Titel:Observational indications of downward-propagating gravity waves in middle atmosphere lidar data
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Kaifler, NatalieDLR, IPAhttps://orcid.org/0000-0002-3118-6480
Kaifler, BerndDLR, IPAhttps://orcid.org/0000-0002-5891-242X
Ehard, BenediktDLR, IPAhttps://orcid.org/0000-0003-0517-8134
Gisinger, SonjaDLR, IPAhttps://orcid.org/0000-0001-8188-4458
Dörnbrack, AndreasDLR, IPAhttps://orcid.org/0000-0003-0936-0216
Rapp, MarkusDLR, IPANICHT SPEZIFIZIERT
Kivi, RigelFinnish Meteorological Institute, Sodankylä, Finlandhttps://orcid.org/0000-0001-8828-2759
Kozlovsky, AlexanderSodankylä Geophysical Observatory, Finlandhttps://orcid.org/0000-0003-1468-7600
Lester, M.University Leicester, United Kingdomhttps://orcid.org/0000-0001-7353-5549
Liley, BenNIWA, Lauder, New Zealandhttps://orcid.org/0000-0002-8844-7928
Datum:10 März 2017
Erschienen in:Journal of Atmospheric and Solar-Terrestrial Physics
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI :10.1016/j.jastp.2017.03.003
Seitenbereich:Seiten 1-40
ISSN:1364-6826
Status:veröffentlicht
Stichwörter:Gravity waves; Middle atmosphere; Lidar; Downward-propagating waves
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Atmosphären- und Klimaforschung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Institut für Physik der Atmosphäre > Verkehrsmeteorologie
Hinterlegt von: Kaifler, Dr. Natalie
Hinterlegt am:13 Mär 2017 20:28
Letzte Änderung:31 Mai 2017 13:10

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