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« L’océan mondial, qui abrite la majorité des espèces vivantes sur Terre (50 à 80 % selon les estimations), génère plus de 60 % des services écosystémiques qui nous permettent de vivre, à commencer par la production de la majeure partie de l’oxygène que nous respirons. Il absorbe environ 30 % des émissions de CO2 générées par l’humanité, ce qui provoque son acidification.
L’océan mondial régule à plus de 80 % le climat de la Terre. Il joue un rôle majeur dans la température terrestre. »
Source : Wikipedia
Coalition citoyenne pour la protection de l’Océan
filtre:
René M. van Westen
The Gulf Stream is part of the Atlantic Meridional Overturning Circulation (AMOC). The AMOC is a tipping element and may collapse under changing forcing. However, the role of the Gulf Stream in such a tipping event is unknown. Here, we investigate the link between the AMOC and Gulf Stream using a high-resolution (0. 1°) stand-alone ocean simulation, in which the AMOC collapses under a slowly-increasing freshwater forcing. AMOC weakening gradually shifts the Gulf Stream near Cape Hatteras northward, followed by an abrupt northward displacement of 219 km within 2 years. This rapid shift occurs a few decades before the simulated AMOC collapse. Satellite altimetry shows a significant (1993–2024, p < 0.05) northward Gulf Stream trend near Cape Hatteras, which is also confirmed in subsurface temperature observations (1965–2024, p < 0.01). These findings provide indirect evidence for present-day AMOC weakening and demonstrate that abrupt Gulf Stream shifts can serve as early warning indicator for AMOC tipping.
