Petits Renseignements Svp!

cafécanelle · le 29 février 2008

Bonjour, je voudrais avoir un renseignement SVP. Alors voilà mon frére est à l'université et il a un devoir sur les cyclones a effectué, et il a élaboré un exposé en français. Mais le problème c'est que l'exposé il faut qu'il soit rédigé en anglais... Et il a pas vraiment de temps pour le faire, en plus n'étant pas doué en anglais... il stress... car la note rentre en compte dans les notes de partiel apparement. Donc je me demander si c'était possible de vous envoyer l'exposé afin que vous puissiez le traduire SVP! Voilà... j'espère que c'est possible...

A bientôt!

Jean B · le 29 février 2008

Bonsoir,

Ça c'est plutôt l'affaire d'un spécialiste des Sciences de la Terre, non ?

Personnellement, je ne suis que "généraliste" et je crains de coincer sur le vocabulaire technique.

Mais si ce n'est pas trop long, on peut toujours y jeter un oeil.

A toutes fins utiles, je te donne l'adresse d'un autre site où tu pourrais avoir plus de chance de tomber sur de véritables anglophones.

http://help.berberber.com/

Bonne chance.

cafécanelle · le 1 mars 2008

Message supprimé car faisant doublon

cafécanelle · le 1 mars 2008

Bonjour mrci beaucoup pour votre aide! J'ai ssayé d joindre le document microsoft word au messag mais ça ne marche pas... Je vais réessayr ultérieurement... En tous les cas je vais aller faire un tour sur le site que vous m'avez conseillé! Encore merci et à bientôt!

Jean B · le 1 mars 2008

Bonjour,

Cela m'étonne car moi qui suis tout sauf expert en la matière, je n'arrête pas de faire des copier/coller à partir de Word et ça marche. Je te le garantis.

cafécanelle · le 1 mars 2008

Rebonjour!

Voila j'ai enfin réussi... En faite ça premais du temps car il y avait une image... Donc je l'aie supprimé et ça a été nettement plus rapide! Si vous voulez y jetez un oeil. A bientôt!

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Copie_de_VIDE_VIDE.doc

Jean B · le 1 mars 2008

Bonjour,

Voilà pour le frangin, avec le bonjour du "Monsieur météo" improvisé...!

THE CYCLONE

The name « cyclone » comes from the Greek « Kuklos » which means circle. The cyclone is an atmospheric disturbance appearing as a great mass of clouds which form in tropical areas from a rotating movement by convergent and divergent airstreams. Cyclones fascinate through their power and scale but also through their complexity and unpredictability. Where do those impressive meteorological wraths come from? Where do they develop? And where do they take their destructive power?

I FORMATION OF A CYCLONE

The formation of a cyclone is a phenomenon that requires several elements and conditions.

First, cyclones form from atmospheric disturbances which result from the evaporation of sea water followed by the condensation of that water. Those disturbances generally lie in the intertropical area of convergence but they can also come from temperate areas, then move to the tropics. So doing they gain tropical characteristics and become an unstable mass of clouds with a high degree of humidity.

Inside and around this disturbance there must be winds which have the same power and the same direction from the surface up to an altitude of 15 kilometers.

If the wind changes its direction or its power according to the altitude, the disturbance is going to “cut itself”, lose its energy and the cyclone will not be able to form.

Once these elements are acquired, two other conditions are going to play a part in the making of a cyclone. One geographical condition: the disturbance must lie at more than 5 degrees from the equator (north or south) so that the Coriolis force can act. One thermal condition: the ocean water temperature must be over 26°C to at least 50 meters deep so that the evaporation of great quantities of water can provide the cyclone with enough energy.

Once all these elements are met, the situation is ideal to form a cyclone.

The disturbance will get its power from the warm ocean water, its winds will be deflected and wound thanks to the Coriolis force. The high altitude divergence and the high humidity will enable the cyclone to feed itself.

The decline of a cyclone is linked with the same conditions. The former will have its power lessened and will weaken until it disappears if one of the conditions is no longer met. Thus, the cyclone will considerably weaken when it heads towards too cold waters or too close to the equator or even towards too great land expanses.

PLACES AND PERIODS OF FORMATION

The intertropical area of divergence determines the regions which are suitable to the formation of cyclones. It changes its position according to the months of the year. Thus in November, it lies in the southern hemisphere and passes through Australia; and in June it goes up north again to the northern hemisphere.

The 7 cyclonic basins

In the northern hemisphere, the period lies between June and October. These regions are situated more precisely in the north-east Pacific basin, the Atlantic basin (north Atlantic, Gulf of Mexico and Caribbean sea), the north Indian ocean basin and the north-west Pacific basin; in the southern hemisphere, it lies between November and May and its regions are situated in the south-west and east Indian ocean basin, the Australia and south-west Pacific ocean basin.

II STRUCTURE OF A CYCLONE

The general structure of a cyclone is characterized by an enormous mass of clouds that can extend within a radius of 500 to 1000 km and reach 20 km of altitude. It organizes itself into spiral bands converging towards a dense central ring.

The central part of the disturbance is called the eye of the cyclone; there, the wind is weak, the atmospheric pressure is low. Generally, its diameter reaches 30 to 60 km but can vary from 8 to 200 km. The eye consists of descending air: descending movement.

The part around the eye of the cyclone is called wall of the eye: ascending movement: wind consisting of damp and warm air. The violence of the cyclone concentrates in that part which is then very dangerous.

The spiral bands of rain are bands of showers which surround the cyclone and whirl towards the centre of the storm. The damp and warm air feeds the winds of the cyclone wall: they are the ascending movements.

CYCLONE: A NECESSARY EVIL

If cyclones often have disastrous consequences, they also have a useful function in the general balance of the planet.

They take part in the thermal balance of the planet between the tropics and the poles. Without cyclones, the tropical regions would get warmer and warmer and the polar regions would get colder and colder. That is the reason why they are sometimes called “safety valves”.

CONCLUSION

Finally we can conclude that the birth of cyclones is an environmental cause: water temperature, winds direction and speed. We have seen that the climatic conditions are met with difficulty to form a cyclone; and that, even if they are all present, a cyclone will not always form. Then we can therefore wonder whether the greenhouse effect and global warming would not be the cause of the increasing birth rate of cyclones.

cafécanelle · le 2 mars 2008

Merci beaucoup, de la part de mon frère et de moi-même ! Vous êtes super ! J’espère que les termes techniques ne vous ont pas posé trop de problème… Je vous remercie encore et à bientôt !

Jean B · le 2 mars 2008

Merci beaucoup, de la part de mon frère et de moi-même ! Vous êtes super ! J'espère que les termes techniques ne vous ont pas posé trop de problème… Je vous remercie encore et à bientôt !

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