 |
| Titel |
Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event |
| VerfasserIn |
S. M. I. Azeem, E. R. Talaat, G. G. Sivjee, J.-H. Yee |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 28, no. 1 ; Nr. 28, no. 1 (2010-01-25), S.267-276 |
| Datensatznummer |
250016760
|
| Publikation (Nr.) |
 copernicus.org/angeo-28-267-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| We present kinetic temperatures at ~87 km and ~94 km altitudes
inferred from OH (6,2) and O2 At(0,1) airglow observations, respectively,
at South Pole (90° S), Antarctica in the austral winter of 2002.
These OH and O2 rotational temperatures measurements show mesosphere and
lower thermosphere (MLT) temperature anomalies prior to the 2002 Southern
Hemisphere Sudden Stratospheric Warming (SSW) . In this paper we focus on the
first of the three minor stratospheric warmings which preceded the major SSW
event. Temperature anomalies observed in the MLT region show sudden cooling
(ΔT=~30 K) in OH temperatures accompanied by warming (ΔT=~15 K)
in O2 temperatures preceding the onset of SSW event by about
three to four weeks. This shallow vertical extent of mesospheric cooling is
in agreement with the numerical simulation of Coy et al. (2005),
however, the model cooling was centered well below the mesopause level. The
other observed feature of the South Pole MLT temperature dataset is the
intensification of planetary wave activity prior to the onset of SSW event.
Fourier analyses of both OH and O2 temperatures show amplification of
planetary wave activity in the 5–10 day range prior to the onset of SSW. The
timing of wave amplification seen in the wave spectra coincides with the peak
in OH and O2 temperature anomalies. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|