La Convergence Antarctique est la frontière hydrologique où les eaux chaudes du Nord rencontrent les eaux plus froides, plus denses et moins salées du Sud. Lorsque les eaux plus froides plongent sous celles plus chaudes, il
se crée un phénomène océanographique appelé ”up-welling” qui apporte en surface des nutriments. La Convergence est une frontière dont la position varie, et que l’on rencontre entre 40oS et 60oS. C’est la limite biologique de l’écosystème antarctique. L’océan Antarctique est la partie de l’océan Austral au sud de la Convergence. Lorsqu’on approche de cette frontière, les brouillards sont plus fréquents et la densité de la faune s’accroît, mais la mer ne devient pas plus difficile ou ne change pas de couleur pour autant. La seule méthode scientifique pour savoir que l’on a traversé la Convergence, c’est de mesurer la variation de la température de la mer. Également connue comme le Front Polaire, la Convergence fait partie du Courant Circumpolaire Antarctique. En effet, les eaux de l’Antarctique circulent autour du continent dans le plus gros courant océanique de la planète, dont le débit est estimé à 150 millions de m3 par seconde, soit 4 fois le Gulf Stream ou 1 000 fois l’Amazone. Enfin, les eaux profondes de l’Antarctique circulent vers le Nord et ont un impact énorme sur le climat mondial : en se propageant loin dans les océans Pacifique et Atlantique, elles refroidissent les eaux tropicales et tempérées, en permettant un équilibre mondial des températures.
Copyright secured by Digiprove © 2018 Jean-Pierre Tholl
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