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| Titel |
Multi-model mean nitrogen and sulfur deposition from the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP): evaluation of historical and projected future changes |
| VerfasserIn |
J.-F. Lamarque, F. Dentener, J. McConnell, C.-U. Ro, M. Shaw, R. Vet, D. Bergmann, P. Cameron-Smith, S. Dalsoren, R. Doherty, G. Faluvegi, S. J. Ghan, B. Josse, Y. H. Lee, I. A. MacKenzie, D. Plummer, D. T. Shindell  , R. B. Skeie, D. S. Stevenson, S. Strode, G. Zeng, M. Curran, D. Dahl-Jensen, S. Das, D. Fritzsche, M. Nolan |
| 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 ; 13, no. 16 ; Nr. 13, no. 16 (2013-08-20), S.7997-8018 |
| Datensatznummer |
250085635
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| Publikation (Nr.) |
 copernicus.org/acp-13-7997-2013.pdf |
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| Zusammenfassung |
| We present multi-model global datasets of nitrogen and sulfate deposition
covering time periods from 1850 to 2100, calculated within the Atmospheric
Chemistry and Climate Model Intercomparison Project (ACCMIP). The computed
deposition fluxes are compared to surface wet deposition and ice core
measurements. We use a new dataset of wet deposition for 2000–2002 based on
critical assessment of the quality of existing regional network data. We show
that for present day (year 2000 ACCMIP time slice), the ACCMIP results
perform similarly to previously published multi-model assessments. For this
time slice, we find a multi-model mean deposition of approximately
50 Tg(N) yr−1 from nitrogen oxide emissions, 60 Tg(N) yr−1 from
ammonia emissions, and 83 Tg(S) yr−1 from sulfur emissions. The
analysis of changes between 1980 and 2000 indicates significant differences
between model and measurements over the United States but less so over
Europe. This difference points towards a potential misrepresentation of 1980
NH3 emissions over North America. Based on ice core records, the 1850
deposition fluxes agree well with Greenland ice cores, but the change between
1850 and 2000 seems to be overestimated in the Northern Hemisphere for both
nitrogen and sulfur species. Using the Representative Concentration Pathways
(RCPs) to define the projected climate and atmospheric chemistry related
emissions and concentrations, we find large regional nitrogen deposition
increases in 2100 in Latin America, Africa and parts of Asia under some of
the scenarios considered. Increases in South Asia are especially large, and
are seen in all scenarios, with 2100 values more than double their 2000
counterpart in some scenarios and reaching
> 1300 mg(N) m−2 yr−1 averaged over regional to continental-scale regions in RCP 2.6 and 8.5, ~ 30–50% larger than the values
in any region currently (circa 2000). However, sulfur deposition
rates in 2100 are in all regions lower than in 2000 in all the RCPs. The new
ACCMIP multi-model deposition dataset provides state-of-the-science,
consistent and evaluated time slice (spanning 1850–2100) global gridded
deposition fields for use in a wide range of climate and ecological studies. |
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