 |
| Titel |
The quasi 16-day wave in mesospheric water vapor during boreal winter 2011/2012 |
| VerfasserIn |
D. Scheiben, B. Tschanz, K. Hocke, N. Kämpfer, S. Ka, J. J. Oh |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 13 ; Nr. 14, no. 13 (2014-07-01), S.6511-6522 |
| Datensatznummer |
250118847
|
| Publikation (Nr.) |
 copernicus.org/acp-14-6511-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| This study investigates the characteristics of the quasi 16-day wave in the
mesosphere during boreal winter 2011/2012 using observations of water vapor
from ground-based microwave radiometers and satellite data. The ground-based
microwave radiometers are located in Seoul (South Korea, 37° N),
Bern (Switzerland, 47° N) and Sodankylä (Finland,
67° N). The quasi 16-day wave is observed in the mesosphere at all
three locations, while the dominant period increases with latitude from
15 days at Seoul to 20 days at Sodankylä. The observed evolution of the
quasi 16-day wave confirms that the wave activity is strongly decreased
during a sudden stratospheric warming that occurred in mid-January 2012.
Using satellite data from the Microwave Limb Sounder on the Aura satellite,
we examine the zonal characteristics of the quasi 16-day wave and conclude
that the observed waves above the midlatitudinal stations Seoul and Bern are
eastward-propagating s = −1 planetary waves with periods of 15 to
16 days, while the observed oscillation above the polar station Sodankylä
is a standing wave with a period of approximately 20 days. The strongest
relative wave amplitudes in water vapor during the investigated time period
are approximately 15%. The wave activity varies strongly along a latitude
circle. The activity of the quasi 16-day wave in mesospheric water vapor
during boreal winter 2011/2012 is strongest over northern Europe, the North
Atlantic Ocean and northwestern Canada. The region of highest wave activity
seems to be related to the position of the polar vortex. We conclude that the
classic approach to characterize planetary waves zonally averaged along a
latitude circle is not sufficient to explain the local observations because
of the strong longitudinal dependence of the wave activity. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|