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| Titel |
Distributions and regional budgets of aerosols and their precursors simulated with the EMAC chemistry-climate model |
| VerfasserIn |
A. Pozzer, A. Meij, K. J. Pringle, H. Tost, U. M. Doering, J. Aardenne, J. Lelieveld  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 2 ; Nr. 12, no. 2 (2012-01-19), S.961-987 |
| Datensatznummer |
250010541
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| Publikation (Nr.) |
 copernicus.org/acp-12-961-2012.pdf |
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| Zusammenfassung |
| The new global anthropogenic emission inventory
(EDGAR-CIRCE) of gas and aerosol pollutants has been incorporated in
the chemistry general circulation model EMAC (ECHAM5/MESSy Atmospheric
Chemistry). A relatively high horizontal resolution simulation is performed for
the years 2005–2008 to evaluate the capability of the model and the
emissions to reproduce observed aerosol concentrations and aerosol
optical depth (AOD) values. Model output is compared with
observations from different measurement networks (CASTNET, EMEP and
EANET) and AODs from remote sensing instruments (MODIS and MISR).
A good spatial agreement of the distribution of sulfate and ammonium aerosol
is found when compared to observations, while calculated nitrate
aerosol concentrations show some discrepancies. The simulated
temporal development of the inorganic aerosols is in line with
measurements of sulfate and nitrate aerosol, while for ammonium
aerosol some deviations from observations occur over the USA,
due to the wrong temporal distribution of ammonia gas emissions.
The calculated AODs agree well with the satellite observations in most
regions, while negative biases are found for the equatorial area and in
the dust outflow regions (i.e. Central Atlantic and Northern Indian
Ocean), due to an underestimation of biomass burning and aeolian dust
emissions, respectively.
Aerosols and precursors budgets for five different regions
(North America, Europe, East Asia, Central Africa and South America)
are calculated. Over East-Asia most of the emitted aerosols (precursors) are also
deposited within the region, while in North America and Europe
transport plays a larger role.
Further, it is shown that a simulation with monthly varying anthropogenic
emissions typically improves the temporal correlation
by 5–10% compared to one with constant annual emissions. |
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