|Title||Reduced interdecadal variability of Atlantic Meridional Overturning Circulation under global warming|
|Publication Type||Journal Article|
|Year of Publication||2016|
|Authors||Cheng J., Liu Z.Y, Zhang S.Q, Liu W, Dong L.N, Liu P., Li H.L|
|Journal||Proceedings of the National Academy of Sciences of the United States of America|
|Type of Article||Article|
|Keywords||Atlantic Meridional Overturning Circulation; atmosphere; basin modes; climate; driven; dynamics; global warming; interdecadal variability; mechanism; multidecadal oscillation; Ocean circulation; oceanic stratification; rainfall; Rossby wave; thermohaline circulation|
Interdecadal variability of the Atlantic Meridional Overturning Circulation (AMOC-IV) plays an important role in climate variation and has significant societal impacts. Past climate reconstruction indicates that AMOC-IV has likely undergone significant changes. Despite some previous studies, responses of AMOC-IV to global warming remain unclear, in particular regarding its amplitude and time scale. In this study, we analyze the responses of AMOC-IV under various scenarios of future global warming in multiple models and find that AMOC-IV becomes weaker and shorter with enhanced global warming. From the present climate condition to the strongest future warming scenario, on average, the major period of AMOC-IV is shortened from similar to 50 y to similar to 20 y, and the amplitude is reduced by similar to 60%. These reductions in period and amplitude of AMOC-IV are suggested to be associated with increased oceanic stratification under global warming and, in turn, the speedup of oceanic baroclinic Rossby waves.