A remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause region
The variability of zonal winds and the horizontal wind velocity variance of short period (20–120 min) gravity waves (GWs) in the equatorial mesopause region are studied using medium frequency (MF) radar observations from Pameungpeuk (7.4° S, 107.4° E) during 2004–2010. The zonal winds display a...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2012-04-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/30/703/2012/angeo-30-703-2012.pdf |
| _version_ | 1828407209415933952 |
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| author | N. Venkateswara Rao T. Tsuda Y. Kawatani |
| author_facet | N. Venkateswara Rao T. Tsuda Y. Kawatani |
| author_sort | N. Venkateswara Rao |
| collection | DOAJ |
| description | The variability of zonal winds and the horizontal wind velocity variance of
short period (20–120 min) gravity waves (GWs) in the equatorial mesopause
region are studied using medium frequency (MF) radar observations from
Pameungpeuk (7.4° S, 107.4° E) during 2004–2010. The zonal winds
display a distinct semiannual oscillation (called mesospheric semiannual
oscillation, MSAO), with westward winds during equinoxes and eastward winds
during solstices. Furthermore, the westward winds during March equinox are
larger during 2008 and 2009. The short period GW variance also shows a
semiannual oscillation with enhanced activity during equinoxes. A good
correlation is observed between the zonal winds and the short period GW
variance from 2008–2010, with the winds being westward during the times of
enhanced GW activity. Such a correlation, however, is less obvious during
2004–2006. The long period (10–20 h) GW variance, on the other hand, does
not show such a correlation throughout the observation period. |
| first_indexed | 2024-12-10T11:22:09Z |
| format | Article |
| id | doaj.art-439be845a2c64a8c861e75b5979034e3 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-10T11:22:09Z |
| publishDate | 2012-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-439be845a2c64a8c861e75b5979034e32022-12-22T01:50:53ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762012-04-013070371010.5194/angeo-30-703-2012A remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause regionN. Venkateswara Rao0T. Tsuda1Y. Kawatani2Research Institute for Sustainable Humanosphere, Kyoto University, Uji, JapanResearch Institute for Sustainable Humanosphere, Kyoto University, Uji, JapanJapan Agency for Marine-Earth Science and Technology, Yokohama, JapanThe variability of zonal winds and the horizontal wind velocity variance of short period (20–120 min) gravity waves (GWs) in the equatorial mesopause region are studied using medium frequency (MF) radar observations from Pameungpeuk (7.4° S, 107.4° E) during 2004–2010. The zonal winds display a distinct semiannual oscillation (called mesospheric semiannual oscillation, MSAO), with westward winds during equinoxes and eastward winds during solstices. Furthermore, the westward winds during March equinox are larger during 2008 and 2009. The short period GW variance also shows a semiannual oscillation with enhanced activity during equinoxes. A good correlation is observed between the zonal winds and the short period GW variance from 2008–2010, with the winds being westward during the times of enhanced GW activity. Such a correlation, however, is less obvious during 2004–2006. The long period (10–20 h) GW variance, on the other hand, does not show such a correlation throughout the observation period.https://www.ann-geophys.net/30/703/2012/angeo-30-703-2012.pdf |
| spellingShingle | N. Venkateswara Rao T. Tsuda Y. Kawatani A remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause region Annales Geophysicae |
| title | A remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause region |
| title_full | A remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause region |
| title_fullStr | A remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause region |
| title_full_unstemmed | A remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause region |
| title_short | A remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause region |
| title_sort | remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause region |
| url | https://www.ann-geophys.net/30/703/2012/angeo-30-703-2012.pdf |
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