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| Titel |
Sensitivity of tropospheric photochemistry to aerosol analyses |
| VerfasserIn |
Vincent Huijnen, Johannes Flemming, Jean-Jacques Morcrette, Jason E. Williams |
| 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 |
250078112
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| Zusammenfassung |
| Tropospheric reactive gases are well known to be sensitive to aerosol
concentrations and distributions in the atmosphere through their impact
on photolysis rates and heterogeneous reactions. Therefore an online
reactive gases and aerosol scheme is likely to improve the forecasts of
tropospheric ozone and its precursors. Within the (EU-FP7)
MACCII-project, we have integrated modules for the modeling of reactive
gases within ECMWF's integrated forecast system. This is referred to as
Composition-IFS (C-IFS). An interaction of the photochemistry with the
aerosol processes, already present in IFS, is now established, where we
can additionally make use of the IFS data-assimilation capabilities.
Using actual observations of aerosol optical depth increases the realism
of the day to day variability in aerosol composition, and hence its
variable impact on tropospheric reactive gases.
Aerosol properties as modeled with the IFS aerosol model are initialized
daily from the MACC reanalysis, which are constrained by assimilated
MODIS observations. Tropospheric chemistry is described by the modified
CB05 chemistry mechanism as adopted from the chemistry transport model
TM5, which applies an explicit on-line parameterization for the
calculation of photolysis rates. With this system we evaluate the impact
of aerosols on photochemistry on a global scale, for the year 2008. |
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