|
|
 |
|
|
Ann. Geophys., 26, 1101-1108, 2008
www.ann-geophys.net/26/1101/2008/
© European Geosciences Union 2008
Anomalous quasi-stationary planetary waves over the Antarctic region in 1988 and 2002
A. V. Grytsai, O. M. Evtushevsky, and G. P. Milinevsky
National Taras Shevchenko University of Kyiv, Ukraine
Abstract. Anomalies in the Antarctic total ozone and amplitudes of the quasi-stationary
planetary waves in the lower stratosphere temperature during the winter and
spring of 1988 and 2002 have been compared. Westward displacement of the
quasi-stationary wave (QSW) extremes by 50°–70° relative to the
preceding years of the strong stratospheric polar vortex in 1987 and 2001,
respectively, was observed. A dependence of the quasi-stationary wave ridge
and trough positions on the strength of the westerly zonal wind in the lower
stratosphere is shown. Comparison of the QSW amplitude in the lower
stratosphere temperature in July and August shows that the amplitude
distribution with latitude in August could be considered as a possible
indication of the future anomalous warming in Antarctic spring. In August
2002, the QSW amplitude of 10 K at the edge region of the polar vortex (60° S–65° S)
preceded the major warming in September, whereas in August
1988, the highest 7 K amplitude at 55° S preceded the large warming in the
next months. These results suggest that the peak value of the lower
stratosphere temperature QSW amplitude and the peak latitudinal position in
late winter can influence the southern polar vortex strength in spring.
Full Article in PDF (964 KB) |
|
|
