Determination of humidity and temperature fluctuations based on MOZAIC data and parametrisation of persistent contrail coverage for general circulation models
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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
1997-08-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/15/1057/1997/angeo-15-1057-1997.pdf |
| _version_ | 1819139178757095424 |
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| author | K. M. Gierens U. Schumann H. G. J. Smit M. Helten G. Zängl |
| author_facet | K. M. Gierens U. Schumann H. G. J. Smit M. Helten G. Zängl |
| author_sort | K. M. Gierens |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-22T11:18:32Z |
| format | Article |
| id | doaj.art-3057ef2f89a94ece9a9df28f9fca20bb |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-22T11:18:32Z |
| publishDate | 1997-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-3057ef2f89a94ece9a9df28f9fca20bb2022-12-21T18:27:56ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761997-08-01151057106610.1007/s00585-997-1057-3Determination of humidity and temperature fluctuations based on MOZAIC data and parametrisation of persistent contrail coverage for general circulation modelsK. M. Gierens0U. Schumann1H. G. J. Smit2M. Helten3G. Zängl4DLR, Institut für Physik der Atmosphäre, Oberpfaffenhofen, D-82230 Weßling, GermanyDLR, Institut für Physik der Atmosphäre, Oberpfaffenhofen, D-82230 Weßling, GermanyForschungszentrum Jülich, Institut für Chemie und Dynamik (ICG2), Postfach 1913, D-52425 Jülich, GermanyForschungszentrum Jülich, Institut für Chemie und Dynamik (ICG2), Postfach 1913, D-52425 Jülich, GermanyDLR, Institut für Physik der Atmosphäre, Oberpfaffenhofen, D-82230 Weßling, GermanyHumidity 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.https://www.ann-geophys.net/15/1057/1997/angeo-15-1057-1997.pdf |
| spellingShingle | K. M. Gierens U. Schumann H. G. J. Smit M. Helten G. Zängl Determination of humidity and temperature fluctuations based on MOZAIC data and parametrisation of persistent contrail coverage for general circulation models Annales Geophysicae |
| title | Determination of humidity and temperature fluctuations based on MOZAIC data and parametrisation of persistent contrail coverage for general circulation models |
| title_full | Determination of humidity and temperature fluctuations based on MOZAIC data and parametrisation of persistent contrail coverage for general circulation models |
| title_fullStr | Determination of humidity and temperature fluctuations based on MOZAIC data and parametrisation of persistent contrail coverage for general circulation models |
| title_full_unstemmed | Determination of humidity and temperature fluctuations based on MOZAIC data and parametrisation of persistent contrail coverage for general circulation models |
| title_short | Determination of humidity and temperature fluctuations based on MOZAIC data and parametrisation of persistent contrail coverage for general circulation models |
| title_sort | determination of humidity and temperature fluctuations based on mozaic data and parametrisation of persistent contrail coverage for general circulation models |
| url | https://www.ann-geophys.net/15/1057/1997/angeo-15-1057-1997.pdf |
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