 |
| Titel |
Tropopause fold occurrence rates over the Antarctic station Troll (72° S, 2.5° E) |
| VerfasserIn |
M. Mihalikova, S. Kirkwood  |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 4 ; Nr. 31, no. 4 (2013-04-04), S.591-598 |
| Datensatznummer |
250019017
|
| Publikation (Nr.) |
 copernicus.org/angeo-31-591-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| One of the important mechanisms of stratosphere–troposphere exchange, which
brings ozone-rich stratospheric air to low altitudes in extratropical
regions, is transport related to tropopause folds. The climatology of folds
has been studied at high latitudes of the Northern Hemisphere with the help
of radars and global models. Global models supply information about fold
occurrence rates at high latitudes of the Southern Hemisphere as well, but so
far comparisons with direct measurements are rare. The Moveable Atmospheric
Radar for Antarctica (MARA), a 54.5 MHz wind-profiler radar, has been operated at
the Norwegian year-round station Troll, Antarctica (72° S,
2.5° E) since December 2011. Frequent tropopause fold signatures have
been observed. In this study, based on MARA observations, an occurrence rate
statistics of tropopause folds from December 2011 until November 2012 has
been made, and radar data have been compared with the analysis from the
European Center for Medium-Range Weather Forecasting (ECMWF). The fold
occurrence rates exhibit an annual cycle with winter maximum and summer
minimum and suggest significantly higher occurrence rates for the given
location than those obtained previously by global model studies. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|