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Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models

Stober, G. and Kuchar, Ales and Pokhotelov, Dimitry and Liu, Huixin and Liu, Hanli and Schmidt, Hauke and Jacobi, Christoph and Baumgarten, K. and Brown, Peter and Janches, Diego and Murphy, Damian J. and Kozlovsky, Alexander and Lester, Mark and Belova, Evgenia and Kero, Johan and Mitchell, Nicholas (2021) Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models. AGU Fall Meeting, New Orleans, USA.

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Official URL: https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/837455


Meteor radars have been proven to be valuable assets in investigating and monitoring mesosphere/lower thermosphere winds for the last two decades. In this study we present a comparison of almost continuous meteor radar measurements obtained from six meteor radars located at mid- and polar conjugate latitudes in both hemispheres. For this purpose we havecompiled harmonized data sets for the Sodankylä (67.9°N, 21.1°E), Esrange (67.4°N, 26.6°E), Davis (68.6°S, 78.0°E), Collm (51.3°N, 13.0°E), Tierra del Fuego meteor radar (53.7°S, 67.7°W) and the Canadian Meteor Orbit Radar (CMOR) (43.3°N, 80.8°W). The analysis revealed characteristic differences between the northern and southern hemisphere in the mean winds, in the strength of the mesospheric jets as well as in the tidal climatologies. In particular, semidiurnal tides show significant and distinct interhemispheric differences, notably a strong seasonal asymmetry in amplitude and phase, most prominent during the hemispheric fall transition from September to November. We also compared the observational climatologies with predictions from the three general circulation models GAIA, WACCM-X(SD) and ICON-UA. The model data were analyzed by simulating the radar in the model domain and applying an identical diagnostic to extract mean winds, tides and gravity wave activity. Our comparison reveals substantial differences between model and observational mean winds and tides that vary seasonally, by model and hemisphere. GAIA indicates similar winds during the hemispheric winter conditions compared to the observations, whereas WACCM-X(SD) showed a better agreement to the observations for the summer zonal wind reversal. The models are only partially able to capture interhemispheric differences, with the free-running ICON-UA model best reproducing the interhemispheric difference of the semidiurnal tide in reasonable agreement to observations.

Item URL in elib:https://elib.dlr.de/185921/
Document Type:Conference or Workshop Item (Speech)
Title:Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Stober, G.UNSPECIFIEDhttps://orcid.org/0000-0002-7909-6345UNSPECIFIED
Kuchar, AlesFaculty of Physics and Earth Sciences, Leipzig Institute for Meteorology (LIM), Leipzig, Germanyhttps://orcid.org/0000-0002-3672-6626UNSPECIFIED
Pokhotelov, DimitryUNSPECIFIEDhttps://orcid.org/0000-0002-3712-0597UNSPECIFIED
Liu, HuixinUNSPECIFIEDhttps://orcid.org/0000-0001-7073-4366UNSPECIFIED
Schmidt, HaukeMPI für Meteorologie, HamburgUNSPECIFIEDUNSPECIFIED
Jacobi, ChristophUniversity of Leipzig, Germanyhttps://orcid.org/0000-0002-7878-0110UNSPECIFIED
Baumgarten, K.UNSPECIFIEDhttps://orcid.org/0000-0002-5455-1698UNSPECIFIED
Brown, PeterCentre for Planetary Science and Exploration, Western University, London, Ontario N6A 5B7, CanadaUNSPECIFIEDUNSPECIFIED
Janches, DiegoITM Physics Laboratory,NASA/Goddard Space Flight Center, 8800 Greenbelt Roadhttps://orcid.org/0000-0001-8615-5166UNSPECIFIED
Murphy, Damian J.Australian Antarctic Division, Hobart, Tasmaniahttps://orcid.org/0000-0003-1738-5560UNSPECIFIED
Kozlovsky, AlexanderSodankylä Geophysical Observatory, Finlandhttps://orcid.org/0000-0003-1468-7600UNSPECIFIED
Lester, MarkUniversity Leicester, United Kingdomhttps://orcid.org/0000-0001-7353-5549UNSPECIFIED
Belova, EvgeniaSwedish Institute of Space Physics (IRF), Kiruna, Swedenhttps://orcid.org/0000-0002-6698-321XUNSPECIFIED
Kero, JohanSwedish Institute of Space Physics (IRF), Kiruna, Swedenhttps://orcid.org/0000-0002-2177-6751UNSPECIFIED
Mitchell, NicholasUniversity of Bath, Bath, United KingdomUNSPECIFIEDUNSPECIFIED
Date:17 December 2021
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Thermosphere dynamics, radar observations, modelling
Event Title:AGU Fall Meeting
Event Location:New Orleans, USA
Event Type:international Conference
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 - Solar-Terrestrial Physics SO
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Solar-Terrestrial Coupling Processes
Deposited By: Pokhotelov, Dimitry
Deposited On:18 May 2022 11:28
Last Modified:18 May 2022 11:28

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