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| Titel |
Do stratospheric ozone measurements show large tropical width changes? |
| VerfasserIn |
Sean Davis, Birgit Hassler, Karen Rosenlof |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250136790
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| Publikation (Nr.) |
 EGU/EGU2016-17903.pdf |
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| Zusammenfassung |
| The total column ozone amount varies with latitude, in part due to the difference in
tropopause height between the tropics and midlatitudes. This dependency of column ozone on
latitude has been exploited by several studies to identify tropical edge latitudes and to
compute their trends. The tropical widening trend over the past several decades from this
method is greater than 3˚ latitude decade−1, a rate which is significantly larger than most
other tropical widening estimates.
We assess the robustness of the previously used methodology by comparing it to a new
objective gradient-based method of total column ozone. The total column ozone
methodologies are then compared to a diagnostic based on vertically resolved satellite ozone
data from the Stratospheric Water and OzOne Satellite Homogenized (SWOOSH) data set.
Our results indicate a general lack of robustness of the previous estimates, and are more in
line with other tropical widening estimates indicating poleward expansion rates of < 1˚
latitude decade−1. |
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