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| Titel |
Simulating the global atmospheric response to aircraft water vapour emissions and contrails: a first approach using a GCM |
| VerfasserIn |
M. Ponater, S. Brinkop, R. Sausen, U. Schumann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 9 ; Nr. 14, no. 9, S.941-960 |
| Datensatznummer |
250012416
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| Publikation (Nr.) |
 copernicus.org/angeo-14-941-1996.pdf |
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| Zusammenfassung |
| The effect of contrails and aircraft water
vapour emissions on global climate is studied by means of a general circulation
model (GCM). In a first approach water vapour emissions and mean contrail
coverage within the main flight routes are prescribed according to current
observations in a simplified manner. A hierarchic experiment strategy with
gradual increase of the forcing is applied to identify the resulting climate
signals. The water vapour increase to be expected from air traffic is too small
to force a detectable radiative or climatic response. The sensitivity of the
model climate to the occurrence of contrails appears to be higher. For
mid-latitude summer conditions, the high cloud increase experiments show a
consistent temperature response pattern. However, its magnitude is statistically
significant only for a mean contrail coverage exceeding present-day amounts.
Moreover, the magnitude of the contrail climate signal is highly sensitive to
the details of the experimental setup due to several non-linearities of the
cloud-radiative interaction. Hence, the prescription of contrails in the GCM has
to be as careful as possible for an optimal treatment of the problem. Respective
recommendations are given. |
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