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| Titel |
AirClim: an efficient tool for climate evaluation of aircraft technology |
| VerfasserIn |
V. Grewe, A. Stenke |
| 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 ; 8, no. 16 ; Nr. 8, no. 16 (2008-08-11), S.4621-4639 |
| Datensatznummer |
250006321
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| Publikation (Nr.) |
 copernicus.org/acp-8-4621-2008.pdf |
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| Zusammenfassung |
| Climate change is a challenge to society and to cope with requires assessment tools which are suitable
to evaluate new technology options with respect to their impact on global climate.
Here we present AirClim, a model which comprises a linearisation of atmospheric processes
from the emission to radiative forcing, resulting in an estimate in near surface temperature change,
which is presumed to be a reasonable indicator for climate change.
The model is designed to be applicable to aircraft technology,
i.e. the climate agents CO2, H2O, CH4 and O3 (latter two resulting from NOx-emissions)
and contrails are taken into account.
AirClim combines a number of precalculated atmospheric data with aircraft emission data
to obtain the temporal evolution of atmospheric concentration changes, radiative forcing and temperature changes.
These precalculated data are derived from
25 steady-state simulations for the year 2050 with the climate-chemistry model
E39/C, prescribing normalised emissions of nitrogen oxides and water vapour
at various atmospheric regions.
The results show that strongest climate impacts (year 2100) from ozone changes
occur for emissions in the tropical upper
troposphere (60 mW/m2; 80 mK for 1 TgN/year emitted) and from methane changes from emissions in the middle
tropical troposphere (−2.7% change in methane lifetime; –30 mK per TgN/year).
For short-lived species (e.g. ozone, water vapour, methane) individual perturbation lifetimes are derived
depending on the region of emission.
A comparison of this linearisation approach with results from a comprehensive climate-chemistry model
shows reasonable agreement
with respect to concentration changes, radiative forcing, and temperature changes.
For example, the total impact of a supersonic fleet on
radiative forcing (mainly water vapour) is reproduced within 10%.
A wide range of application is demonstrated. |
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