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| Titel |
BRAM: a reanalysis of Aura MLS chemical observations by the Belgian Assimilation System for Chemical ObsErvations |
| VerfasserIn |
Quentin Errera, Geir Braathen, Simon Chabrillat, Yves Christophe, Michelle Santee, Sergey Skachko |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250153632
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| Publikation (Nr.) |
 EGU/EGU2017-18633.pdf |
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| Zusammenfassung |
| BRAM is a reanalysis of Aura MLS observations produced by the Belgian Assimilation
System of Chemical ObsErvations (BASCOE). BASCOE is based on a chemistry transport
model (CTM) for the stratosphere involving 58 species. All species are advected by
the Flux Form Semi-Lagrangian (FFSL) scheme (i.e. Lin and Rood, 1996). The
CTM account for gas phase, photolysis and heterogeneous reactions relevant for the
stratosphere. Micro-physics of Polar Stratospheric Cloud (PSC) is also taken into
account in the model by a simple parameterization. For this study, the model is
driven by ERA-Interim dynamical fields. The horizontal resolution is set to 2.5∘ in
latitude and 3.75∘ in longitude. Vertically, the model has 37 levels from the surface
to 0.1 hPa which correspond to the ERA-Interim levels in the stratosphere and a
subset of them in the troposphere. BASCOE can be run in 4D-Var or EnKF and for
BRAM, the EnKF method has been used. The period of the reanalysis starts in August
2004, at the beginning of the MLS mission, and go up to the present. Assimilated
species are MLS retrieved profiles of O3, CO, H2O, N2O, HNO3, HCl, ClO and
CH3Cl.
This contribution will present the setup of BASCOE, the evaluation of BRAM and the way to
get the data. |
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