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Titel |
Evaluation of CLaMS, KASIMA and ECHAM5/MESSy1 simulations in the lower stratosphere using observations of Odin/SMR and ILAS/ILAS-II |
VerfasserIn |
F. Khosrawi, R. Müller, M. H. Proffitt, R. Ruhnke, O. Kirner, P. Jöckel, J. U. Grooss, J. Urban, D. Murtagh, H. Nakajima |
Konferenz |
EGU General Assembly 2009
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 11 (2009) |
Datensatznummer |
250024379
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Zusammenfassung |
1-year data sets of monthly averaged nitrous oxide (N2O) and ozone (O3) derived from
satellite measurements were used as a tool for the evaluation of atmospheric photochemical
models. Two 1-year data sets, one derived from the Improved Limb Atmospheric
Spectrometer (ILAS and ILAS-II) and one from the Odin Sub-Millimetre Radiometer
(Odin/SMR) were employed. Here, these data sets are used for the evaluation of two
Chemical Transport Models (CTMs), the Karlsruhe Simulation Model of the Middle
Atmosphere (KASIMA) and the Chemical Lagrangian Model of the Stratosphere (CLaMS)
as well as for one Chemistry-Climate Model (CCM), the atmospheric chemistry
general circulation model ECHAM5/MESSy1 (E5M1) in the lower stratosphere with
focus on the northern hemisphere. Since the Odin/SMR measurements cover the
entire hemisphere, the evaluation is performed for the entire hemisphere as well as
for the low latitudes, midlatitudes and high latitudes using the Odin/SMR 1-year
data set as reference. To assess the impact of using different data sets for such an
evaluation study we repeat the evaluation for the polar lower stratosphere using the
ILAS/ILAS-II data set. Only small differences were found using ILAS/ILAS-II instead
of Odin/SMR as a reference, thus, showing that the results are not influenced by
the particular satellite data set used for the evaluation. The evaluation of CLaMS,
KASIMA and E5M1 shows that all models are in good agreement with Odin/SMR and
ILAS/ILAS-II. Differences are generally in the range of ±20%. Larger differences (up to
-40%) are found in all models at 500±25Â K for N2O mixing ratios greater than 200
ppb. Generally, the largest differences were found for the tropics and the lowest for
the polar regions. However, an underestimation of polar winter ozone loss was
found both in KASIMA and E5M1 both in the northern and southern hemisphere. |
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