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

Stober, G. and Janches, D. and Matthias, Vivien and Fritts, David C. and Marino, J. and Moffat-Griffin, T. and Baumgarten, Kathrin and Lee, Wonseok and Murphy, Damian J. and Kim, Yongha and Mitchell, Nicholas and Palo, S. (2020) Seasonal Reynolds stress components, winds and tides in the Southern hemisphere mesosphere/lower thermosphere in 2019. AGU Fall Meeting, 01.-17. Dez 2020, Online / San Francisco. (Unpublished)

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Abstract

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 six meteor radars at southern hemisphere locations ranging from mid- to polar latitudes. These include Tierra del Fuego, 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 behavior and altitude dependence showing the largest values at higher altitudes during the hemispheric winter and two variance minima during the equinoxes. In addition, the hemispheric summer mesopause and the zonal wind reversal can be identified in the wind variances.

Item URL in elib:https://elib.dlr.de/140500/
Document Type:Conference or Workshop Item (Speech)
Title:Seasonal Reynolds stress components, winds and tides in the Southern hemisphere mesosphere/lower thermosphere in 2019
Authors:
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, VivienVivien.Matthias (at) dlr.deUNSPECIFIED
Fritts, David C.GATS, Boulder, ColoradoUNSPECIFIED
Marino, J.John.Marino (at) colorado.eduUNSPECIFIED
Moffat-Griffin, T.tmof (at) bas.ac.ukUNSPECIFIED
Baumgarten, KathrinFraunhofer IGD, Rostock, GermanyUNSPECIFIED
Lee, WonseokChungnam National University, Daejeon, South KoreaUNSPECIFIED
Murphy, Damian J.Australian Antarctic Division, Hobart, Tasmaniahttps://orcid.org/0000-0003-1738-5560
Kim, YonghaChungnam National University, Daejeon, South KoreaUNSPECIFIED
Mitchell, NicholasUniversity of Bath, Bath, United KingdomUNSPECIFIED
Palo, S.Palo (at) colorado.eduUNSPECIFIED
Date:December 2020
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:Southern Hemisphere, Gravity waves, Meteor radar
Event Title:AGU Fall Meeting
Event Location:Online / San Francisco
Event Type:international Conference
Event Dates:01.-17. Dez 2020
Organizer:AGU
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 - Atmospheric and climate research
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Solar-Terrestrial Coupling Processes
Deposited By: Matthias, Vivien
Deposited On:20 Jan 2021 14:17
Last Modified:20 Jan 2021 14:17

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