The 16-day planetary waves: multi-MF radar observations from the arctic to equator and comparisons with the HRDI measurements and the GSWM modelling results
International audience The mesospheric and lower thermospheric (MLT) winds (60?100 km) obtained by multiple MF radars, located from the arctic to equator at Tromsø (70° N, 19° E), Saskatoon (52° N, 107° W), London (43° N, 81° W), Hawaii (21° N, 157° W) and Christmas Island (2° N, 157° W), respective...
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ftinsu:oai:HAL:hal-00318827v1 2023-11-12T04:13:01+01:00 The 16-day planetary waves: multi-MF radar observations from the arctic to equator and comparisons with the HRDI measurements and the GSWM modelling results Luo, Y. Manson, A. H. Meek, C. E. Meyer, C. K. Burrage, M. D. Fritts, D. C. Hall, C. M. Hocking, W. K. Macdougall, J. Riggin, D. M. Vincent, R. A. Institute of Space and Atmospheric Studies Saskatoon (ISAS) Department of Physics and Engineering Physics Saskatoon University of Saskatchewan Saskatoon (U of S)-University of Saskatchewan Saskatoon (U of S) Colorado Research Associates Boulder (CoRA) NorthWest Research Associates (NWRA) Space Physics Research Laboratory Ann Arbor (SPRL) University of Michigan Ann Arbor University of Michigan System-University of Michigan System Tromsø Geophysical Observatory (TGO) The Arctic University of Norway Tromsø, Norway (UiT) Department of Physics and Astronomy London, ON University of Western Ontario (UWO) Department of Physics and Mathematical Physics 2002 https://hal.science/hal-00318827 https://hal.science/hal-00318827/document https://hal.science/hal-00318827/file/angeo-20-691-2002.pdf en eng HAL CCSD European Geosciences Union hal-00318827 https://hal.science/hal-00318827 https://hal.science/hal-00318827/document https://hal.science/hal-00318827/file/angeo-20-691-2002.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00318827 Annales Geophysicae, 2002, 20 (5), pp.691-709 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2002 ftinsu 2023-10-25T16:24:57Z International audience The mesospheric and lower thermospheric (MLT) winds (60?100 km) obtained by multiple MF radars, located from the arctic to equator at Tromsø (70° N, 19° E), Saskatoon (52° N, 107° W), London (43° N, 81° W), Hawaii (21° N, 157° W) and Christmas Island (2° N, 157° W), respectively, are used to study the planetary-scale 16-day waves. Based on the simultaneous observations (1993/1994), the variabilities of the wave amplitudes, periods and phases are derived. At mid- and high-latitude locations the 16-day waves are usually pervasive in the winter-centred seasons (October through March), with the amplitude gradually decreasing with height. From the subtropical location to the equator, the summer wave activities become strong at some particular altitude where the inter-hemisphere wave ducts possibly allow for the leakage of the wave from the other hemispheric winter. The observational results are in good agreement with the theoretical conclusion that, for slowly westward-traveling waves, such as the 16-day wave, vertical propagation is permitted only in an eastward background flow of moderate speed which is present in the winter hemisphere. The wave period also varies with height and time in a range of about 12?24 days. The wave latitudinal differences and the vertical structures are compared with the Global Scale Wave Model (GSWM) for the winter situation. Although their amplitude variations and profiles have a similar tendency, the discrepancies are considerable. For example, the maximum zonal amplitude occurs around 40° N for radar but 30° N for the model. The phase differences between sites due to the latitudinal effect are basically consistent with the model prediction of equatorward phase-propagation. The global 16-day waves at 95 km from the HRDI wind measurements during 1992 through 1995 are also displayed. Again, the wave is a winter dominant phenomenon with strong amplitude around the 40?60° latitude-band on both hemispheres. Article in Journal/Newspaper Arctic Tromsø Institut national des sciences de l'Univers: HAL-INSU Arctic Tromsø |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Luo, Y. Manson, A. H. Meek, C. E. Meyer, C. K. Burrage, M. D. Fritts, D. C. Hall, C. M. Hocking, W. K. Macdougall, J. Riggin, D. M. Vincent, R. A. The 16-day planetary waves: multi-MF radar observations from the arctic to equator and comparisons with the HRDI measurements and the GSWM modelling results |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The mesospheric and lower thermospheric (MLT) winds (60?100 km) obtained by multiple MF radars, located from the arctic to equator at Tromsø (70° N, 19° E), Saskatoon (52° N, 107° W), London (43° N, 81° W), Hawaii (21° N, 157° W) and Christmas Island (2° N, 157° W), respectively, are used to study the planetary-scale 16-day waves. Based on the simultaneous observations (1993/1994), the variabilities of the wave amplitudes, periods and phases are derived. At mid- and high-latitude locations the 16-day waves are usually pervasive in the winter-centred seasons (October through March), with the amplitude gradually decreasing with height. From the subtropical location to the equator, the summer wave activities become strong at some particular altitude where the inter-hemisphere wave ducts possibly allow for the leakage of the wave from the other hemispheric winter. The observational results are in good agreement with the theoretical conclusion that, for slowly westward-traveling waves, such as the 16-day wave, vertical propagation is permitted only in an eastward background flow of moderate speed which is present in the winter hemisphere. The wave period also varies with height and time in a range of about 12?24 days. The wave latitudinal differences and the vertical structures are compared with the Global Scale Wave Model (GSWM) for the winter situation. Although their amplitude variations and profiles have a similar tendency, the discrepancies are considerable. For example, the maximum zonal amplitude occurs around 40° N for radar but 30° N for the model. The phase differences between sites due to the latitudinal effect are basically consistent with the model prediction of equatorward phase-propagation. The global 16-day waves at 95 km from the HRDI wind measurements during 1992 through 1995 are also displayed. Again, the wave is a winter dominant phenomenon with strong amplitude around the 40?60° latitude-band on both hemispheres. |
author2 |
Institute of Space and Atmospheric Studies Saskatoon (ISAS) Department of Physics and Engineering Physics Saskatoon University of Saskatchewan Saskatoon (U of S)-University of Saskatchewan Saskatoon (U of S) Colorado Research Associates Boulder (CoRA) NorthWest Research Associates (NWRA) Space Physics Research Laboratory Ann Arbor (SPRL) University of Michigan Ann Arbor University of Michigan System-University of Michigan System Tromsø Geophysical Observatory (TGO) The Arctic University of Norway Tromsø, Norway (UiT) Department of Physics and Astronomy London, ON University of Western Ontario (UWO) Department of Physics and Mathematical Physics |
format |
Article in Journal/Newspaper |
author |
Luo, Y. Manson, A. H. Meek, C. E. Meyer, C. K. Burrage, M. D. Fritts, D. C. Hall, C. M. Hocking, W. K. Macdougall, J. Riggin, D. M. Vincent, R. A. |
author_facet |
Luo, Y. Manson, A. H. Meek, C. E. Meyer, C. K. Burrage, M. D. Fritts, D. C. Hall, C. M. Hocking, W. K. Macdougall, J. Riggin, D. M. Vincent, R. A. |
author_sort |
Luo, Y. |
title |
The 16-day planetary waves: multi-MF radar observations from the arctic to equator and comparisons with the HRDI measurements and the GSWM modelling results |
title_short |
The 16-day planetary waves: multi-MF radar observations from the arctic to equator and comparisons with the HRDI measurements and the GSWM modelling results |
title_full |
The 16-day planetary waves: multi-MF radar observations from the arctic to equator and comparisons with the HRDI measurements and the GSWM modelling results |
title_fullStr |
The 16-day planetary waves: multi-MF radar observations from the arctic to equator and comparisons with the HRDI measurements and the GSWM modelling results |
title_full_unstemmed |
The 16-day planetary waves: multi-MF radar observations from the arctic to equator and comparisons with the HRDI measurements and the GSWM modelling results |
title_sort |
16-day planetary waves: multi-mf radar observations from the arctic to equator and comparisons with the hrdi measurements and the gswm modelling results |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.science/hal-00318827 https://hal.science/hal-00318827/document https://hal.science/hal-00318827/file/angeo-20-691-2002.pdf |
geographic |
Arctic Tromsø |
geographic_facet |
Arctic Tromsø |
genre |
Arctic Tromsø |
genre_facet |
Arctic Tromsø |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00318827 Annales Geophysicae, 2002, 20 (5), pp.691-709 |
op_relation |
hal-00318827 https://hal.science/hal-00318827 https://hal.science/hal-00318827/document https://hal.science/hal-00318827/file/angeo-20-691-2002.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782331217154146304 |