Climatology of northern polar latitude MLT dynamics: Mean winds and tides
Mean winds and tides in the northern polar Mesosphere and Lower Thermosphere (MLT) have been studied using meteor radars located at Resolute Bay (75° N, 95° W) and Yellowknife (62.5° N, 114.3° W). The measurements for Resolute Bay span almost 12 years from July 1997 to February 2009 and the Yellowkn...
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Online Access: | https://doi.org/10.34657/4071 https://oa.tib.eu/renate/handle/123456789/5442 |
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ftleibnizopen:oai:oai.leibnizopen.de:tiePVYsBBwLIz6xGlwd- 2023-11-12T04:16:00+01:00 Climatology of northern polar latitude MLT dynamics: Mean winds and tides Kumar, G.K. Hocking, W.K. 2010 application/pdf https://doi.org/10.34657/4071 https://oa.tib.eu/renate/handle/123456789/5442 eng eng Göttingen : Copernicus CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/ Annales Geophysicae 28 (2010), 10 Meteorology and atmospheric dynamics (Middle atmosphere dynamics) annual variation atmospheric dynamics jet stream meridional circulation meteorology summer tide zonal flow Canada Cornwallis Island Northwest Territories Nunavut Queen Elizabeth Islands Resolute Bay Yellowknife 550 article Text 2010 ftleibnizopen https://doi.org/10.34657/4071 2023-10-22T23:18:44Z Mean winds and tides in the northern polar Mesosphere and Lower Thermosphere (MLT) have been studied using meteor radars located at Resolute Bay (75° N, 95° W) and Yellowknife (62.5° N, 114.3° W). The measurements for Resolute Bay span almost 12 years from July 1997 to February 2009 and the Yellowknife data cover 7 years from June 2002 to October 2008. The analysis reveals similar wind flow over both sites with a difference in magnitude. The summer zonal flow is westward at lower heights, eastward at upper heights and the winter zonal flow is eastward at all heights. The winter meridional flow is poleward and sometimes weakly equatorward, while non winter months show equatorward flow, with a strong equatorward jet during mid-summer months. The zonal and meridional winds show strong interannual variation with a dominant annual variation as well as significant latitudinal variation. Year to year variability in both zonal and meridional winds exists, with a possible solar cycle dependence. The diurnal, semidiurnal and terdiurnal tides also show large interannual variability and latitudinal variation. The diurnal amplitudes are dominated by an annual variation. The climatological monthly mean winds are compared with CIRA 86, GEWM and HWM07 and the climatological monthly mean amplitudes and phases of diurnal and semidiurnal tides are compared with GSWM00 predictions. The GEWM shows better agreement with observations than the CIRA 86 and HWM07. The GSWM00 model predictions need to be modified above 90 km. The agreements and disagreements between observations and models are discussed. © 2010 Author(s). publishedVersion Article in Journal/Newspaper Cornwallis Island Northwest Territories Nunavut Queen Elizabeth Islands Resolute Bay Yellowknife Unknown Canada Cornwallis ENVELOPE(-54.464,-54.464,-61.072,-61.072) Cornwallis Island ENVELOPE(-95.001,-95.001,75.135,75.135) Northwest Territories Nunavut Resolute Bay ENVELOPE(-94.842,-94.842,74.677,74.677) Yellowknife |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
Meteorology and atmospheric dynamics (Middle atmosphere dynamics) annual variation atmospheric dynamics jet stream meridional circulation meteorology summer tide zonal flow Canada Cornwallis Island Northwest Territories Nunavut Queen Elizabeth Islands Resolute Bay Yellowknife 550 |
spellingShingle |
Meteorology and atmospheric dynamics (Middle atmosphere dynamics) annual variation atmospheric dynamics jet stream meridional circulation meteorology summer tide zonal flow Canada Cornwallis Island Northwest Territories Nunavut Queen Elizabeth Islands Resolute Bay Yellowknife 550 Kumar, G.K. Hocking, W.K. Climatology of northern polar latitude MLT dynamics: Mean winds and tides |
topic_facet |
Meteorology and atmospheric dynamics (Middle atmosphere dynamics) annual variation atmospheric dynamics jet stream meridional circulation meteorology summer tide zonal flow Canada Cornwallis Island Northwest Territories Nunavut Queen Elizabeth Islands Resolute Bay Yellowknife 550 |
description |
Mean winds and tides in the northern polar Mesosphere and Lower Thermosphere (MLT) have been studied using meteor radars located at Resolute Bay (75° N, 95° W) and Yellowknife (62.5° N, 114.3° W). The measurements for Resolute Bay span almost 12 years from July 1997 to February 2009 and the Yellowknife data cover 7 years from June 2002 to October 2008. The analysis reveals similar wind flow over both sites with a difference in magnitude. The summer zonal flow is westward at lower heights, eastward at upper heights and the winter zonal flow is eastward at all heights. The winter meridional flow is poleward and sometimes weakly equatorward, while non winter months show equatorward flow, with a strong equatorward jet during mid-summer months. The zonal and meridional winds show strong interannual variation with a dominant annual variation as well as significant latitudinal variation. Year to year variability in both zonal and meridional winds exists, with a possible solar cycle dependence. The diurnal, semidiurnal and terdiurnal tides also show large interannual variability and latitudinal variation. The diurnal amplitudes are dominated by an annual variation. The climatological monthly mean winds are compared with CIRA 86, GEWM and HWM07 and the climatological monthly mean amplitudes and phases of diurnal and semidiurnal tides are compared with GSWM00 predictions. The GEWM shows better agreement with observations than the CIRA 86 and HWM07. The GSWM00 model predictions need to be modified above 90 km. The agreements and disagreements between observations and models are discussed. © 2010 Author(s). publishedVersion |
format |
Article in Journal/Newspaper |
author |
Kumar, G.K. Hocking, W.K. |
author_facet |
Kumar, G.K. Hocking, W.K. |
author_sort |
Kumar, G.K. |
title |
Climatology of northern polar latitude MLT dynamics: Mean winds and tides |
title_short |
Climatology of northern polar latitude MLT dynamics: Mean winds and tides |
title_full |
Climatology of northern polar latitude MLT dynamics: Mean winds and tides |
title_fullStr |
Climatology of northern polar latitude MLT dynamics: Mean winds and tides |
title_full_unstemmed |
Climatology of northern polar latitude MLT dynamics: Mean winds and tides |
title_sort |
climatology of northern polar latitude mlt dynamics: mean winds and tides |
publisher |
Göttingen : Copernicus |
publishDate |
2010 |
url |
https://doi.org/10.34657/4071 https://oa.tib.eu/renate/handle/123456789/5442 |
long_lat |
ENVELOPE(-54.464,-54.464,-61.072,-61.072) ENVELOPE(-95.001,-95.001,75.135,75.135) ENVELOPE(-94.842,-94.842,74.677,74.677) |
geographic |
Canada Cornwallis Cornwallis Island Northwest Territories Nunavut Resolute Bay Yellowknife |
geographic_facet |
Canada Cornwallis Cornwallis Island Northwest Territories Nunavut Resolute Bay Yellowknife |
genre |
Cornwallis Island Northwest Territories Nunavut Queen Elizabeth Islands Resolute Bay Yellowknife |
genre_facet |
Cornwallis Island Northwest Territories Nunavut Queen Elizabeth Islands Resolute Bay Yellowknife |
op_source |
Annales Geophysicae 28 (2010), 10 |
op_rights |
CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.34657/4071 |
_version_ |
1782333205515337728 |