 |
| Titel |
The total ozone field separated into meteorological regimes – Part II: Northern Hemisphere mid-latitude total ozone trends |
| VerfasserIn |
R. D. Hudson, M. F. Andrade, M. B. Follette, A. D. Frolov |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 12 ; Nr. 6, no. 12 (2006-11-15), S.5183-5191 |
| Datensatznummer |
250004178
|
| Publikation (Nr.) |
 copernicus.org/acp-6-5183-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
| Previous studies have presented clear evidence that the Northern Hemisphere
total ozone field can be separated into distinct regimes (tropical,
midlatitude, polar, and arctic) the boundaries of which are associated with
the subtropical and polar upper troposphere fronts, and in the winter, the
polar vortex. This paper presents a study of total ozone variability within
these regimes, from 1979–2003, using data from the TOMS instruments. The
change in ozone within each regime for the period January 1979–May 1991, a
period of rapid total ozone change, was studied in detail. Previous studies
had observed a zonal linear trend of −3.15% per decade for the latitude
band 25°–60° N. When the ozone field is separated by regime, linear
trends of −1.4%, 2.3%, and 3.0%, per decade for the tropical,
midlatitude, and polar regimes, respectively, are observed. The changes in
the relative areas of the regimes were also derived from the ozone data. The
relative area of the polar regime decreased by about 20%; the tropical
regime increased by about 10% over this period. No significant change was
detected for the midlatitude regime. From the trends in the relative area
and total ozone it is deduced that 35% of the trend between 25° and
60° N, from January 1979–May 1991 is due to movement of the upper
troposphere fronts. The changes in the relative areas can be associated with
a change in the mean latitude of the subtropical and polar fronts within the
latitude interval 25° to 60° N. Over the period from January 1979 to
May 1991, both fronts moved northward by 1.1±0.2 degrees per decade.
Over the entire period of the study, 1979–2003, the subtropical front moved
northward at a rate of 1.1±0.1 degrees per decade, while the polar
front moved by 0.5±0.1 degrees per decade. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|