The wintertime two-day wave in the Polar Stratosphere, Mesosphere and lower Thermosphere
International audience Recent observations of the polar mesosphere have revealed that waves with periods near two days reach significant amplitudes in both summer and winter. This is in striking contrast to mid-latitude observations where two-day waves maximise in summer only. Here, we use data from...
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ftinsu:oai:HAL:hal-00303141v1 2023-11-12T04:13:33+01:00 The wintertime two-day wave in the Polar Stratosphere, Mesosphere and lower Thermosphere Sandford, D. J. Schwartz, M. J. Mitchell, N. J. Centre for Space, Atmospheric and Oceanic Science Bath (CSAOS) University of Bath Bath Microwave Atmospheric Science Group JPL Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH)-NASA-California Institute of Technology (CALTECH) 2007-10-16 https://hal.science/hal-00303141 https://hal.science/hal-00303141/document https://hal.science/hal-00303141/file/acpd-7-14747-2007.pdf en eng HAL CCSD European Geosciences Union hal-00303141 https://hal.science/hal-00303141 https://hal.science/hal-00303141/document https://hal.science/hal-00303141/file/acpd-7-14747-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00303141 Atmospheric Chemistry and Physics Discussions, 2007, 7 (5), pp.14747-14765 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2007 ftinsu 2023-10-25T16:26:24Z International audience Recent observations of the polar mesosphere have revealed that waves with periods near two days reach significant amplitudes in both summer and winter. This is in striking contrast to mid-latitude observations where two-day waves maximise in summer only. Here, we use data from a meteor radar at Esrange (68° N, 21° E) in the Arctic and data from the MLS instrument aboard the EOS Aura satellite to investigate the wintertime polar two-day wave in the stratosphere, mesosphere and lower thermosphere. The radar data reveal that mesospheric two-day wave activity measured by horizontal-wind variance has a semi-annual cycle with maxima in winter and summer and equinoctial minima. The MLS data reveal that the summertime wave in the mesosphere is dominated by a westward-travelling zonal wavenumber three wave with significant westward wavenumber four present. It reaches largest amplitudes at mid-latitudes in the southern hemisphere. In the winter polar mesosphere, however, the wave appears to be an eastward-travelling zonal wavenumber two, which is not seen during the summer. At the latitude of Esrange, the eastward-two wave reaches maximum amplitudes near the stratopause and appears related to similar waves previously observed in the polar stratosphere. We conclude that the wintertime polar two-day wave is the mesospheric manifestation of an eastward-propagating, zonal-wavenumber-two wave originating in the stratosphere, maximising at the stratopause and likely to be generated by instabilities in the polar night jet. Article in Journal/Newspaper Arctic polar night Institut national des sciences de l'Univers: HAL-INSU Arctic Esrange ENVELOPE(21.117,21.117,67.883,67.883) |
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 |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Sandford, D. J. Schwartz, M. J. Mitchell, N. J. The wintertime two-day wave in the Polar Stratosphere, Mesosphere and lower Thermosphere |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Recent observations of the polar mesosphere have revealed that waves with periods near two days reach significant amplitudes in both summer and winter. This is in striking contrast to mid-latitude observations where two-day waves maximise in summer only. Here, we use data from a meteor radar at Esrange (68° N, 21° E) in the Arctic and data from the MLS instrument aboard the EOS Aura satellite to investigate the wintertime polar two-day wave in the stratosphere, mesosphere and lower thermosphere. The radar data reveal that mesospheric two-day wave activity measured by horizontal-wind variance has a semi-annual cycle with maxima in winter and summer and equinoctial minima. The MLS data reveal that the summertime wave in the mesosphere is dominated by a westward-travelling zonal wavenumber three wave with significant westward wavenumber four present. It reaches largest amplitudes at mid-latitudes in the southern hemisphere. In the winter polar mesosphere, however, the wave appears to be an eastward-travelling zonal wavenumber two, which is not seen during the summer. At the latitude of Esrange, the eastward-two wave reaches maximum amplitudes near the stratopause and appears related to similar waves previously observed in the polar stratosphere. We conclude that the wintertime polar two-day wave is the mesospheric manifestation of an eastward-propagating, zonal-wavenumber-two wave originating in the stratosphere, maximising at the stratopause and likely to be generated by instabilities in the polar night jet. |
author2 |
Centre for Space, Atmospheric and Oceanic Science Bath (CSAOS) University of Bath Bath Microwave Atmospheric Science Group JPL Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH)-NASA-California Institute of Technology (CALTECH) |
format |
Article in Journal/Newspaper |
author |
Sandford, D. J. Schwartz, M. J. Mitchell, N. J. |
author_facet |
Sandford, D. J. Schwartz, M. J. Mitchell, N. J. |
author_sort |
Sandford, D. J. |
title |
The wintertime two-day wave in the Polar Stratosphere, Mesosphere and lower Thermosphere |
title_short |
The wintertime two-day wave in the Polar Stratosphere, Mesosphere and lower Thermosphere |
title_full |
The wintertime two-day wave in the Polar Stratosphere, Mesosphere and lower Thermosphere |
title_fullStr |
The wintertime two-day wave in the Polar Stratosphere, Mesosphere and lower Thermosphere |
title_full_unstemmed |
The wintertime two-day wave in the Polar Stratosphere, Mesosphere and lower Thermosphere |
title_sort |
wintertime two-day wave in the polar stratosphere, mesosphere and lower thermosphere |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00303141 https://hal.science/hal-00303141/document https://hal.science/hal-00303141/file/acpd-7-14747-2007.pdf |
long_lat |
ENVELOPE(21.117,21.117,67.883,67.883) |
geographic |
Arctic Esrange |
geographic_facet |
Arctic Esrange |
genre |
Arctic polar night |
genre_facet |
Arctic polar night |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00303141 Atmospheric Chemistry and Physics Discussions, 2007, 7 (5), pp.14747-14765 |
op_relation |
hal-00303141 https://hal.science/hal-00303141 https://hal.science/hal-00303141/document https://hal.science/hal-00303141/file/acpd-7-14747-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782331500043173888 |