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| Titel |
Investigation of the spatial and temporal variation of tropospheric ozone using SCIAMACHY limb-nadir matching observations |
| VerfasserIn |
Felix Ebojie, Christian von Savigny, Annette Ladstätter-Weißenmayer, Stefan Bötel, Heinrich Bovensmann, John Burrows |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250046199
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| Zusammenfassung |
| Tropopsheric ozone concentration varies both spatially and temporarily. It varies from
non-detectable near the sources of production to several hundreds parts per billion
(ppb) of air in areas downwind of the source of production. It also varies temporally
in phase with human activity patterns, increasing during the day when formation
rates exceed destruction rates, and decreases at night when formation processes are
inactive. This diurnal variation in ozone depends on location, with the peaks being
very high for relatively brief periods of time in urban areas, and being low with
relatively little diurnal variation in remote regions. It also varies seasonally, being
highest during summer and early spring months and lower during winter months.
Tropospheric ozone concentration also varies annually due to some metrological
conditions such as El Nino, La Nina and other variations in global pressure systems that
promote more or less dispersion of emission than normal. In this presentation, we
investigate the spatial and temporal variation of tropospheric ozone using the Scanning
Imaging Absorption spectroMeter for Atmospheric CartograpHY (SCIAMACHY)
limb-nadir observation techniques. This technique involves the retrieval of stratospheric
ozone column from the UV-B spectral range of the limb scattering measurements of
SCIAMACHY, and the total ozone column also from the same instrument in the
nadir viewing geometry. The stratospheric column was derived by integrating the
stratospheric ozone concentration upward from the tropopause height. The tropopause
height was determined using the daily temperatures of standard analyses from the
European Centre for Medium-Range Weather Forecasts (ECMWF) in 1.5ox 1.5o
x 91 levels, by an algorithm which was based on both the thermal definition of
tropopause using the WMO lapse-rate criterion as well as the potential vorticity
definitions of the tropopause. The total column was retrieved using the Weighting
Function DOAS algorithm (WFDOAS) at the spectral window of 326.6 nm - 334.5 nm.
The tropopspheric ozone column was then derived by subtracting the stratospheric
ozone column from the total ozone column. This talk will be aimed at presenting
some innovating results on the spatial and temporal variation of tropospheric ozone
column as well as the sensitivity studies and some validations that were carried out. |
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