Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models
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...
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2021
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ftdlr:oai:elib.dlr.de:185921 2023-05-15T18:20:18+02:00 Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models Stober, G. Kuchar, Ales Pokhotelov, Dimitry Liu, Huixin Liu, Hanli Schmidt, Hauke Jacobi, Christoph Baumgarten, K. Brown, Peter Janches, Diego Murphy, Damian J. Kozlovsky, Alexander Lester, Mark Belova, Evgenia Kero, Johan Mitchell, Nicholas 2021-12-17 application/pdf https://elib.dlr.de/185921/ https://elib.dlr.de/185921/1/AGU_interhemispheric_differences_audio.pdf https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/837455 en eng https://elib.dlr.de/185921/1/AGU_interhemispheric_differences_audio.pdf Stober, G. und Kuchar, Ales und Pokhotelov, Dimitry und Liu, Huixin und Liu, Hanli und Schmidt, Hauke und Jacobi, Christoph und Baumgarten, K. und Brown, Peter und Janches, Diego und Murphy, Damian J. und Kozlovsky, Alexander und Lester, Mark und Belova, Evgenia und Kero, Johan und 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. Solar-Terrestrische Kopplungsprozesse Konferenzbeitrag NonPeerReviewed 2021 ftdlr 2022-05-22T23:12:20Z 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. Conference Object Sodankylä Tierra del Fuego German Aerospace Center: elib - DLR electronic library Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) Esrange ENVELOPE(21.117,21.117,67.883,67.883) |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
English |
topic |
Solar-Terrestrische Kopplungsprozesse |
spellingShingle |
Solar-Terrestrische Kopplungsprozesse Stober, G. Kuchar, Ales Pokhotelov, Dimitry Liu, Huixin Liu, Hanli Schmidt, Hauke Jacobi, Christoph Baumgarten, K. Brown, Peter Janches, Diego Murphy, Damian J. Kozlovsky, Alexander Lester, Mark Belova, Evgenia Kero, Johan Mitchell, Nicholas Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models |
topic_facet |
Solar-Terrestrische Kopplungsprozesse |
description |
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. |
format |
Conference Object |
author |
Stober, G. Kuchar, Ales Pokhotelov, Dimitry Liu, Huixin Liu, Hanli Schmidt, Hauke Jacobi, Christoph Baumgarten, K. Brown, Peter Janches, Diego Murphy, Damian J. Kozlovsky, Alexander Lester, Mark Belova, Evgenia Kero, Johan Mitchell, Nicholas |
author_facet |
Stober, G. Kuchar, Ales Pokhotelov, Dimitry Liu, Huixin Liu, Hanli Schmidt, Hauke Jacobi, Christoph Baumgarten, K. Brown, Peter Janches, Diego Murphy, Damian J. Kozlovsky, Alexander Lester, Mark Belova, Evgenia Kero, Johan Mitchell, Nicholas |
author_sort |
Stober, G. |
title |
Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models |
title_short |
Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models |
title_full |
Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models |
title_fullStr |
Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models |
title_full_unstemmed |
Comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models |
title_sort |
comparing interhemispheric differences of mesosphere/lower thermosphere dynamics from ground-based observations and three general circulation models |
publishDate |
2021 |
url |
https://elib.dlr.de/185921/ https://elib.dlr.de/185921/1/AGU_interhemispheric_differences_audio.pdf https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/837455 |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) ENVELOPE(21.117,21.117,67.883,67.883) |
geographic |
Sodankylä Esrange |
geographic_facet |
Sodankylä Esrange |
genre |
Sodankylä Tierra del Fuego |
genre_facet |
Sodankylä Tierra del Fuego |
op_relation |
https://elib.dlr.de/185921/1/AGU_interhemispheric_differences_audio.pdf Stober, G. und Kuchar, Ales und Pokhotelov, Dimitry und Liu, Huixin und Liu, Hanli und Schmidt, Hauke und Jacobi, Christoph und Baumgarten, K. und Brown, Peter und Janches, Diego und Murphy, Damian J. und Kozlovsky, Alexander und Lester, Mark und Belova, Evgenia und Kero, Johan und 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. |
_version_ |
1766197822660542464 |