Regional variations of mesospheric gravity-wave momentum flux over Antarctica
International audience Images of mesospheric airglow and radar-wind measurements have been combined to estimate the difference in the vertical flux of horizontal momentum carried by high-frequency gravity waves over two dissimilar Antarctic stations. Rothera (67° S, 68° W) is situated in the mountai...
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ftccsdartic:oai:HAL:hal-00317914v1 2024-02-11T09:56:38+01:00 Regional variations of mesospheric gravity-wave momentum flux over Antarctica Espy, P. J. Hibbins, R. E. Swenson, G. R. Tang, J. Taylor, M. J. Riggin, D. M. Fritts, D. C. British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Department of Electrical and Computer Engineering Urbana (University of Illinois) University of Illinois at Urbana-Champaign Urbana (UIUC) University of Illinois System-University of Illinois System Department of Physics Logan Utah State University (USU) Colorado Research Associates Boulder (CoRA) NorthWest Research Associates (NWRA) 2006-03-07 https://hal.science/hal-00317914 https://hal.science/hal-00317914/document https://hal.science/hal-00317914/file/angeo-24-81-2006.pdf en eng HAL CCSD European Geosciences Union hal-00317914 https://hal.science/hal-00317914 https://hal.science/hal-00317914/document https://hal.science/hal-00317914/file/angeo-24-81-2006.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317914 Annales Geophysicae, 2006, 24 (1), pp.81-88 [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 2006 ftccsdartic 2024-01-14T00:29:30Z International audience Images of mesospheric airglow and radar-wind measurements have been combined to estimate the difference in the vertical flux of horizontal momentum carried by high-frequency gravity waves over two dissimilar Antarctic stations. Rothera (67° S, 68° W) is situated in the mountains of the Peninsula near the edge of the wintertime polar vortex. In contrast, Halley (76° S, 27° W), some 1658 km to the southeast, is located on an ice sheet at the edge of the Antarctic Plateau and deep within the polar vortex during winter. The cross-correlation coefficients between the vertical and horizontal wind perturbations were calculated from sodium (Na) airglow imager data collected during the austral winter seasons of 2002 and 2003 at Rothera for comparison with the 2000 and 2001 results from Halley reported previously (Espy et al., 2004). These cross-correlation coefficients were combined with wind-velocity variances from coincident radar measurements to estimate the daily averaged upper-limit of the vertical flux of horizontal momentum due to gravity waves near the peak emission altitude of the Na nightglow layer, 90km. The resulting momentum flux at both stations displayed a large day-to-day variability and showed a marked seasonal rotation from the northwest to the southwest throughout the winter. However, the magnitude of the flux at Rothera was about 4 times larger than that at Halley, suggesting that the differences in the gravity-wave source functions and filtering by the underlying winds at the two stations create significant regional differences in wave forcing on the scale of the station separation. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Austral Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) The Antarctic |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
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 Espy, P. J. Hibbins, R. E. Swenson, G. R. Tang, J. Taylor, M. J. Riggin, D. M. Fritts, D. C. Regional variations of mesospheric gravity-wave momentum flux over Antarctica |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Images of mesospheric airglow and radar-wind measurements have been combined to estimate the difference in the vertical flux of horizontal momentum carried by high-frequency gravity waves over two dissimilar Antarctic stations. Rothera (67° S, 68° W) is situated in the mountains of the Peninsula near the edge of the wintertime polar vortex. In contrast, Halley (76° S, 27° W), some 1658 km to the southeast, is located on an ice sheet at the edge of the Antarctic Plateau and deep within the polar vortex during winter. The cross-correlation coefficients between the vertical and horizontal wind perturbations were calculated from sodium (Na) airglow imager data collected during the austral winter seasons of 2002 and 2003 at Rothera for comparison with the 2000 and 2001 results from Halley reported previously (Espy et al., 2004). These cross-correlation coefficients were combined with wind-velocity variances from coincident radar measurements to estimate the daily averaged upper-limit of the vertical flux of horizontal momentum due to gravity waves near the peak emission altitude of the Na nightglow layer, 90km. The resulting momentum flux at both stations displayed a large day-to-day variability and showed a marked seasonal rotation from the northwest to the southwest throughout the winter. However, the magnitude of the flux at Rothera was about 4 times larger than that at Halley, suggesting that the differences in the gravity-wave source functions and filtering by the underlying winds at the two stations create significant regional differences in wave forcing on the scale of the station separation. |
author2 |
British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Department of Electrical and Computer Engineering Urbana (University of Illinois) University of Illinois at Urbana-Champaign Urbana (UIUC) University of Illinois System-University of Illinois System Department of Physics Logan Utah State University (USU) Colorado Research Associates Boulder (CoRA) NorthWest Research Associates (NWRA) |
format |
Article in Journal/Newspaper |
author |
Espy, P. J. Hibbins, R. E. Swenson, G. R. Tang, J. Taylor, M. J. Riggin, D. M. Fritts, D. C. |
author_facet |
Espy, P. J. Hibbins, R. E. Swenson, G. R. Tang, J. Taylor, M. J. Riggin, D. M. Fritts, D. C. |
author_sort |
Espy, P. J. |
title |
Regional variations of mesospheric gravity-wave momentum flux over Antarctica |
title_short |
Regional variations of mesospheric gravity-wave momentum flux over Antarctica |
title_full |
Regional variations of mesospheric gravity-wave momentum flux over Antarctica |
title_fullStr |
Regional variations of mesospheric gravity-wave momentum flux over Antarctica |
title_full_unstemmed |
Regional variations of mesospheric gravity-wave momentum flux over Antarctica |
title_sort |
regional variations of mesospheric gravity-wave momentum flux over antarctica |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00317914 https://hal.science/hal-00317914/document https://hal.science/hal-00317914/file/angeo-24-81-2006.pdf |
long_lat |
ENVELOPE(-68.130,-68.130,-67.568,-67.568) |
geographic |
Antarctic Austral Rothera The Antarctic |
geographic_facet |
Antarctic Austral Rothera The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317914 Annales Geophysicae, 2006, 24 (1), pp.81-88 |
op_relation |
hal-00317914 https://hal.science/hal-00317914 https://hal.science/hal-00317914/document https://hal.science/hal-00317914/file/angeo-24-81-2006.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790604651938185216 |