Semidiurnal solar tide differences between fall and spring transition times in the Northern Hemisphere
We present a study of the semidiurnal solar tide (S2) during the fall and spring transition times in the Northern Hemisphere. The tides have been obtained from wind measurements provided by three meteor radars located at Andenes (69° N, 16° E), Juliusruh (54° N, 13° E) and Tavistock (42° N, 81° W)....
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ftleibnizopen:oai:oai.leibnizopen.de:_5NR04kBdbrxVwz6wgF_ 2023-10-01T03:50:13+02:00 Semidiurnal solar tide differences between fall and spring transition times in the Northern Hemisphere Conte, J.F. Chau, J.L. Laskar, F.I. Stober, G. Schmidt, H. Brown, P. 2018 application/pdf https://doi.org/10.34657/4637 https://oa.tib.eu/renate/handle/123456789/6008 eng eng Göttingen : Copernicus GmbH CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ Annales Geophysicae 36 (2018), 4 gravity wave Northern Hemisphere solar tide wave propagation 550 article Text 2018 ftleibnizopen https://doi.org/10.34657/4637 2023-09-03T23:17:19Z We present a study of the semidiurnal solar tide (S2) during the fall and spring transition times in the Northern Hemisphere. The tides have been obtained from wind measurements provided by three meteor radars located at Andenes (69° N, 16° E), Juliusruh (54° N, 13° E) and Tavistock (42° N, 81° W). During the fall, S2 is characterized by a sudden and pronounced decrease occurring every year and at all height levels. The spring transition also shows a decrease in S2, but not sudden and that ascends from lower to higher altitudes during an interval of ∼ 15 to 40 days. To assess contributions of different semidiurnal tidal components, we have examined a 20-year free-run simulation by the Hamburg Model of the Neutral and Ionized Atmosphere (HAMMONIA). We found that the differences exhibited by the S2 tide between equinox times are mainly due to distinct behaviors of the migrating semidiurnal and the non-migrating westward-propagating wave number 1 tidal components (SW2 and SW1, respectively). Specifically, during the fall both SW2 and SW1 decrease, while during the springtime SW2 decreases but SW1 remains approximately constant or decreases only slightly. The decrease shown by SW1 during the fall occurs later than that of SW2 and S2, which indicates that the behavior of S2 is mainly driven by the migrating component. Nonetheless, the influence of SW1 is necessary to explain the behavior of S2 during the spring. In addition, a strong shift in the phase of S2 (of SW2 in the simulations) is also observed during the fall. Our meteor radar wind measurements show more gravity wave activity in the fall than during the spring, which might be indicating that the fall decrease is partly due to interactions between SW2 and gravity waves. © 2018 Author(s). Leibniz_Fonds publishedVersion Article in Journal/Newspaper Andenes LeibnizOpen (The Leibniz Association) |
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Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
gravity wave Northern Hemisphere solar tide wave propagation 550 |
spellingShingle |
gravity wave Northern Hemisphere solar tide wave propagation 550 Conte, J.F. Chau, J.L. Laskar, F.I. Stober, G. Schmidt, H. Brown, P. Semidiurnal solar tide differences between fall and spring transition times in the Northern Hemisphere |
topic_facet |
gravity wave Northern Hemisphere solar tide wave propagation 550 |
description |
We present a study of the semidiurnal solar tide (S2) during the fall and spring transition times in the Northern Hemisphere. The tides have been obtained from wind measurements provided by three meteor radars located at Andenes (69° N, 16° E), Juliusruh (54° N, 13° E) and Tavistock (42° N, 81° W). During the fall, S2 is characterized by a sudden and pronounced decrease occurring every year and at all height levels. The spring transition also shows a decrease in S2, but not sudden and that ascends from lower to higher altitudes during an interval of ∼ 15 to 40 days. To assess contributions of different semidiurnal tidal components, we have examined a 20-year free-run simulation by the Hamburg Model of the Neutral and Ionized Atmosphere (HAMMONIA). We found that the differences exhibited by the S2 tide between equinox times are mainly due to distinct behaviors of the migrating semidiurnal and the non-migrating westward-propagating wave number 1 tidal components (SW2 and SW1, respectively). Specifically, during the fall both SW2 and SW1 decrease, while during the springtime SW2 decreases but SW1 remains approximately constant or decreases only slightly. The decrease shown by SW1 during the fall occurs later than that of SW2 and S2, which indicates that the behavior of S2 is mainly driven by the migrating component. Nonetheless, the influence of SW1 is necessary to explain the behavior of S2 during the spring. In addition, a strong shift in the phase of S2 (of SW2 in the simulations) is also observed during the fall. Our meteor radar wind measurements show more gravity wave activity in the fall than during the spring, which might be indicating that the fall decrease is partly due to interactions between SW2 and gravity waves. © 2018 Author(s). Leibniz_Fonds publishedVersion |
format |
Article in Journal/Newspaper |
author |
Conte, J.F. Chau, J.L. Laskar, F.I. Stober, G. Schmidt, H. Brown, P. |
author_facet |
Conte, J.F. Chau, J.L. Laskar, F.I. Stober, G. Schmidt, H. Brown, P. |
author_sort |
Conte, J.F. |
title |
Semidiurnal solar tide differences between fall and spring transition times in the Northern Hemisphere |
title_short |
Semidiurnal solar tide differences between fall and spring transition times in the Northern Hemisphere |
title_full |
Semidiurnal solar tide differences between fall and spring transition times in the Northern Hemisphere |
title_fullStr |
Semidiurnal solar tide differences between fall and spring transition times in the Northern Hemisphere |
title_full_unstemmed |
Semidiurnal solar tide differences between fall and spring transition times in the Northern Hemisphere |
title_sort |
semidiurnal solar tide differences between fall and spring transition times in the northern hemisphere |
publisher |
Göttingen : Copernicus GmbH |
publishDate |
2018 |
url |
https://doi.org/10.34657/4637 https://oa.tib.eu/renate/handle/123456789/6008 |
genre |
Andenes |
genre_facet |
Andenes |
op_source |
Annales Geophysicae 36 (2018), 4 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.34657/4637 |
_version_ |
1778520091287093248 |