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| Titel |
Determination of humidity and temperature fluctuations based on MOZAIC data and parametrisation of persistent contrail coverage for general circulation models |
| VerfasserIn |
K. M. Gierens, U. Schumann, H. G. J. Smit, M. Helten, G. Zängl |
| 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 ; 15, no. 8 ; Nr. 15, no. 8, S.1057-1066 |
| Datensatznummer |
250012914
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| Publikation (Nr.) |
 copernicus.org/angeo-15-1057-1997.pdf |
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| Zusammenfassung |
| Humidity and temperature fluctuations at
pressure levels between 166 and 290 hPa on the grid scale of general circulation
models for a region covered by the routes of airliners, mainly over the
Atlantic, have been determined by evaluation of the data obtained with almost
2000 flights within the MOZAIC programme. It is found that the distributions of
the fluctuations cannot be modelled by Gaussian distributions, because large
fluctuations appear with a relatively high frequency. Lorentz distributions were
used for the analytical representation of the fluctuation distributions. From
these a joint probability distribution has been derived for simultaneous
temperature and humidity fluctuations. This function together with the criteria
for the formation and persistence of contrails are used to derive the maximum
possible fractional coverage of persistent contrails in a grid cell of a GCM.
This can be employed in a statistical formulation of contrail appearance in a
climate model. |
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