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Gulf Stream: la fin d'un mythe

Seager, Richard

To understand the origin of the mild winters in Europe, Richard Seager and his colleagues have studied how winds and ocean currents distribute heat around the globe. Based on weather observations and data collected by ships, they first showed that the main conveyor of heat to Europe is not the ocean but the atmosphere ... According to their simulations, the two main phenomena involved are part of a large atmospheric flow associated with the presence of the Rockies, which cools the eastern United States, and also the dissipation in the atmosphere of heat stored during summer in surface waters of the ocean. The Gulf Stream there is virtually nothing.

Pour comprendre l‘origine des hivers doux européens, Richard Seager et ses collègues ont étudié la façon dont les vents et les courants marins distribuent la chaleur autour du Globe. Á partir d‘observations météorologiques et des données collectées par les bateaux, ils ont d‘abord montré que le principal convoyeur de chaleur vers L‘Europe n‘est pas l‘océan mais l‘atmosphère... Selon leurs simulations numériques, les deux phénomènes principaux en jeu sont d‘une part les grands écoulements atmosphériques liés à  la présence des Rocheuses, qui refroidissent l‘Est américain, et d‘autre part la dissipation dans l‘atmosphère de la chaleur stockée pendant l‘été dans les eaux superficielles de l‘océan. Le Gulf Stream n‘y est pratiquement pour rien.

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Academic Units
Lamont-Doherty Earth Observatory
Published Here
May 4, 2011
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