Seasonal variations of the Na and Fe layers at the South Pole and their implications for the chemistry and general circulation of the polar mesosphere
Made available in DSpace on 2014-12-28T18:35:37Z (GMT). No. of bitstreams: 1 Gardner2005.pdf: 812006 bytes, checksum: 0233abcb012ab384831a1b0f53376196 (MD5) Open Lidar observations, conducted at the South Pole by University of Illinois researchers, are used to characterize the seasonal variations of...
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Online Access: | http://hdl.handle.net/2142/72646 https://doi.org/10.1029/2004JD005670 |
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ftunivillidea:oai:www.ideals.illinois.edu:2142/72646 2024-10-13T14:10:48+00:00 Seasonal variations of the Na and Fe layers at the South Pole and their implications for the chemistry and general circulation of the polar mesosphere Gardner, Chester S. Plane, John M.C. Pan, Weilin Vondrak, Tomas Murray, Benjamin J. Chu, Xinzhao 2005 http://hdl.handle.net/2142/72646 https://doi.org/10.1029/2004JD005670 en eng American Geophysical Union https://doi.org/10.1029/2004JD005670 http://hdl.handle.net/2142/72646 Copyright 2005 American Geophysical Union South Pole Polar mesosphere Meteorology and Atmospheric Dynamics Article text 2005 ftunivillidea https://doi.org/10.1029/2004JD005670 2024-10-01T12:57:49Z Made available in DSpace on 2014-12-28T18:35:37Z (GMT). No. of bitstreams: 1 Gardner2005.pdf: 812006 bytes, checksum: 0233abcb012ab384831a1b0f53376196 (MD5) Open Lidar observations, conducted at the South Pole by University of Illinois researchers, are used to characterize the seasonal variations of mesospheric Na and Fe above the site. The annual mean layer abundances are virtually identical to midlatitude values, and the mean centroid height is just 100 m higher for Na and 450 m higher for Fe compared with 40 N. The most striking feature of the metal profiles is the almost complete absence of Na and Fe below 90 km during midsummer. This leads to summertime layers with significantly higher peaks, narrower widths, and smaller abundances than are observed at lower latitudes. The measurements are compared with detailed chemical models of these species that were developed at the University of East Anglia. The models accurately reproduce most features of these observations and demonstrate the importance of rapid uptake of the metallic species on the surfaces of polar mesospheric clouds and meteoric smoke particles. The models show that vertical downwelling in winter, associated with the meridional circulation system, must be less than about 1 cm s 1 in the upper mesosphere in order to avoid displacing the minor constituents O, H, and the metal layers too far below 85 km. They also show that an additional source of gas-phase metallic species, that is comparable to the meteoric input, is required during winter to correctly model the Na and Fe abundances. This source appears to arise from the wintertime convergence of the meridional flow over the South Pole. Submitted by Sarah Shreeves (sshreeve@illinois.edu) on 2014-12-28T18:35:36Z No. of bitstreams: 1 Gardner2005.pdf: 812006 bytes, checksum: 0233abcb012ab384831a1b0f53376196 (MD5) Article in Journal/Newspaper South pole University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship) South Pole Journal of Geophysical Research 110 D10 |
institution |
Open Polar |
collection |
University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship) |
op_collection_id |
ftunivillidea |
language |
English |
topic |
South Pole Polar mesosphere Meteorology and Atmospheric Dynamics |
spellingShingle |
South Pole Polar mesosphere Meteorology and Atmospheric Dynamics Gardner, Chester S. Plane, John M.C. Pan, Weilin Vondrak, Tomas Murray, Benjamin J. Chu, Xinzhao Seasonal variations of the Na and Fe layers at the South Pole and their implications for the chemistry and general circulation of the polar mesosphere |
topic_facet |
South Pole Polar mesosphere Meteorology and Atmospheric Dynamics |
description |
Made available in DSpace on 2014-12-28T18:35:37Z (GMT). No. of bitstreams: 1 Gardner2005.pdf: 812006 bytes, checksum: 0233abcb012ab384831a1b0f53376196 (MD5) Open Lidar observations, conducted at the South Pole by University of Illinois researchers, are used to characterize the seasonal variations of mesospheric Na and Fe above the site. The annual mean layer abundances are virtually identical to midlatitude values, and the mean centroid height is just 100 m higher for Na and 450 m higher for Fe compared with 40 N. The most striking feature of the metal profiles is the almost complete absence of Na and Fe below 90 km during midsummer. This leads to summertime layers with significantly higher peaks, narrower widths, and smaller abundances than are observed at lower latitudes. The measurements are compared with detailed chemical models of these species that were developed at the University of East Anglia. The models accurately reproduce most features of these observations and demonstrate the importance of rapid uptake of the metallic species on the surfaces of polar mesospheric clouds and meteoric smoke particles. The models show that vertical downwelling in winter, associated with the meridional circulation system, must be less than about 1 cm s 1 in the upper mesosphere in order to avoid displacing the minor constituents O, H, and the metal layers too far below 85 km. They also show that an additional source of gas-phase metallic species, that is comparable to the meteoric input, is required during winter to correctly model the Na and Fe abundances. This source appears to arise from the wintertime convergence of the meridional flow over the South Pole. Submitted by Sarah Shreeves (sshreeve@illinois.edu) on 2014-12-28T18:35:36Z No. of bitstreams: 1 Gardner2005.pdf: 812006 bytes, checksum: 0233abcb012ab384831a1b0f53376196 (MD5) |
format |
Article in Journal/Newspaper |
author |
Gardner, Chester S. Plane, John M.C. Pan, Weilin Vondrak, Tomas Murray, Benjamin J. Chu, Xinzhao |
author_facet |
Gardner, Chester S. Plane, John M.C. Pan, Weilin Vondrak, Tomas Murray, Benjamin J. Chu, Xinzhao |
author_sort |
Gardner, Chester S. |
title |
Seasonal variations of the Na and Fe layers at the South Pole and their implications for the chemistry and general circulation of the polar mesosphere |
title_short |
Seasonal variations of the Na and Fe layers at the South Pole and their implications for the chemistry and general circulation of the polar mesosphere |
title_full |
Seasonal variations of the Na and Fe layers at the South Pole and their implications for the chemistry and general circulation of the polar mesosphere |
title_fullStr |
Seasonal variations of the Na and Fe layers at the South Pole and their implications for the chemistry and general circulation of the polar mesosphere |
title_full_unstemmed |
Seasonal variations of the Na and Fe layers at the South Pole and their implications for the chemistry and general circulation of the polar mesosphere |
title_sort |
seasonal variations of the na and fe layers at the south pole and their implications for the chemistry and general circulation of the polar mesosphere |
publisher |
American Geophysical Union |
publishDate |
2005 |
url |
http://hdl.handle.net/2142/72646 https://doi.org/10.1029/2004JD005670 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://doi.org/10.1029/2004JD005670 http://hdl.handle.net/2142/72646 |
op_rights |
Copyright 2005 American Geophysical Union |
op_doi |
https://doi.org/10.1029/2004JD005670 |
container_title |
Journal of Geophysical Research |
container_volume |
110 |
container_issue |
D10 |
_version_ |
1812818323634651136 |