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| Titel |
Stratospheric O3 changes during 2001-2010: The small role of solar flux variations in a CTM |
| VerfasserIn |
Sandip Dhomse, Martyn Chipperfield, Wuhu Feng, William Ball, Yvonne Unruh, Joanna Haigh, Natalie Krivova, Sami Solanki |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250074502
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| Zusammenfassung |
| Solar spectral fluxes (or irradiance) measured by the SOlar Radiation and Climate
Experiment (SORCE) shows different variability at ultraviolet (UV) wavelengths compared
to other irradiance measurements and models (e.g. NRL, SATIRE-S). Some modelling
studies have suggested that stratospheric O3 changes during solar cycle 23 (1996-2008) can
only be reproduced if SORCE solar fluxes are used. We have used a 3-D chemical transport
model (CTM), forced by meteorology from the European Centre for Medium-Range Weather
Forecasts (ECMWF), to simulate stratospheric O3 using 3 different solar flux datasets
(SORCE, NRL-SSI and SATIRE-S). Simulated O3 changes are compared with
Microwave Limb Sounder (MLS) and Sounding of the Atmosphere using Broadband
Emission Radiometry (SABER) satellite data. Modelled O3 anomalies using all solar
flux datasets show good agreement with the observations, despite the different flux
variations. A notable feature during this period is a robust positive solar signal in the
tropical middle stratosphere. The CTM reproduces these changes through dynamical
information contained in the analyses. Changes in the upper stratosphere cannot be
used to discriminate between solar flux datasets due to large uncertainties in the
O3 observations. Overall this study suggests that the UV variations detected by
SORCE are not necessary to reproduce observed stratospheric O3 changes during
2001-2010. |
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