File:Emagramme altitude cumulus.svg
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Français : Utilisation d'un émagramme pour déterminer l'altitude de la base des cumulus. On suppose que l'atmosphère est instable au moins jusqu'à la base des cumulus pour que la convection thermique soit possible. L'air quitte le niveau du sol (1000 hPa) avec une température de 30°C (point A), un rapport de mélange saturant de 30 g/kg (point A), un rapport de mélange reel de 4 g/kg (point B) et un point de rosée de 0°C (point B également). L'air ascendant se refroidit en suivant l'adiabatique sèche car il n'a pas le temps d'échanger de chaleur avec l'air ambiant. Le rapport de mélange saturant diminue, l'air se refroidissant est capable de contenir de moins en moins d'humidité. Le rapport de mélange réel reste constant car on suppose que l'air ascendant n'échange pas d'humidité avec l'air ambiant. Lorsque le rapport de mélange saturant atteint le rapport de mélange, l'humidité commence à se condenser : c'est la base des cumulus (à 3500 m d'altitude sur ce schema). |
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: illustration : comment determiner l'altitude de base des cumulus. The original can be viewed here: Emagramme.svg:  . Modifications made by PiRK.
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This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. Subject to disclaimers. | |
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. Subject to disclaimers. |
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This image is a derivative work of the following images:
- File:Emagramme.svg licensed with Cc-by-sa-3.0-migrated-with-disclaimers, GFDL-en
- 2009-10-10T18:52:31Z PiRK 800x600 (93680 Bytes) smaller font for the top annotations (mixing ratio)
- 2009-10-10T18:45:18Z PiRK 800x600 (80529 Bytes) {{Information |Description={{en|Blank emagram }}{{fr|Emagramme vierge}} |Source=*[[:File:Emagram.GIF|]] |Date=2009-10-10 18:40 (UTC) |Author=*[[:File:Emagram.GIF|]]: Original uploader was [[:en:User:Daelomin|Daelomin]] at [ht
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 16:40, 11 October 2009 | | 800 × 600 (128 KB) | PiRK (talk | contribs) | {{Information |Description={{fr|Utilisation d'un emagramme pour determiner l'altitude de la base des cumulus. On suppose que l'atmosphere est instable au moins jusqu'a la base des cumulus pour que la convection thermique soit possible. L'air quitte le niv |
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