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Seasonal evolution of winds, atmospheric tides and Reynolds stress components in the Southern hemisphere mesosphere/lower thermosphere in 2019

Stober, G. and Janches, D. and Matthias, V. and Fritts, D. and Marino, J. and Moffat-Griffin, T. and Baumgarten, K. and Lee, W. and Murphy, D. and Kim, Y. H. and Mitchell, N. and Palo, S. (2020) Seasonal evolution of winds, atmospheric tides and Reynolds stress components in the Southern hemisphere mesosphere/lower thermosphere in 2019. Annales Geophysicae, 2020, pp. 1-39. Copernicus Publications. doi: 10.5194/angeo-2020-55. ISSN 0992-7689.

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Official URL: https://angeo.copernicus.org/preprints/angeo-2020-55/


In this study we explore the seasonal variability of the mean winds, diurnal, semidiurnal tidal amplitude and phases as well as the Reynolds stress components during 2019, utilizing meteor radars at six southern hemisphere locations ranging from mid- to polar latitudes. These include Tierra del Fuego, King Edward Point on South Georgia island, King Sejong Station, Rothera, Davis and McMurdo stations. The year 2019 was exceptional in the southern hemisphere, due to the occurrence of a rare minor stratospheric warming in September. Our results show a substantial longitudinal and latitudinal seasonal variability of mean winds and tides pointing towards a wobbling and asymmetric polar vortex. Furthermore, the derived momentum fluxes and wind variances, utilizing a recently developed algorithm, reveal a characteristic seasonal pattern at each location included in this study. The longitudinal and latitudinal variability of vertical flux of zonal and meridional momentum is discussed in the context of polar vortex asymmetry, spatial and temporal variability, and the longitude and latitude dependence of the vertical propagation conditions of gravity waves. The horizontal momentum fluxes exhibit a rather consistent seasonal structure between the stations while the wind variances indicate a clear seasonal behaviour and altitude dependence showing the largest values at higher altitudes during the hemispheric winter and two variance minima during the equinoxes. Also the hemispheric summer mesopause and the zonal wind reversal can be identified in the wind variances.

Item URL in elib:https://elib.dlr.de/138641/
Document Type:Article
Title:Seasonal evolution of winds, atmospheric tides and Reynolds stress components in the Southern hemisphere mesosphere/lower thermosphere in 2019
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Stober, G.gunter.stober (at) iap.unibe.chhttps://orcid.org/0000-0002-7909-6345
Janches, D.diego.janches (at) nasa.govhttps://orcid.org/0000-0001-8615-5166
Matthias, V.vivien.matthias (at) dlr.dehttps://orcid.org/0000-0003-1806-4507
Fritts, D.dave (at) gats-inc.comUNSPECIFIED
Marino, J.John.Marino (at) colorado.eduUNSPECIFIED
Moffat-Griffin, T.tmof (at) bas.ac.ukUNSPECIFIED
Baumgarten, K.kathrin.baumgarten (at) igd-r.fraunhofer.dehttps://orcid.org/0000-0002-5455-1698
Lee, W.andy0127 (at) naver.comUNSPECIFIED
Murphy, D.Damian.Murphy (at) aad.gov.auUNSPECIFIED
Kim, Y. H.yhkim (at) cnu.ac.krUNSPECIFIED
Mitchell, N.eesnjm (at) bath.ac.ukUNSPECIFIED
Palo, S.Palo (at) colorado.eduUNSPECIFIED
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.5194/angeo-2020-55
Page Range:pp. 1-39
EditorsEmailEditor's ORCID iD
Stober, Guntergunter.stober@iap.unibe.chhttps://orcid.org/0000-0002-7909-6345
Publisher:Copernicus Publications
Keywords:Gravity waves, southern hemisphere, reynold stress components, meteor radar
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Middle Atmosphere
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Solar-Terrestrial Coupling Processes
Deposited By: Matthias, Vivien
Deposited On:08 Dec 2020 08:48
Last Modified:08 Dec 2020 08:48

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