Reduced interdecadal variability of Atlantic Meridional Overturning Circulation under global warming

TitleReduced interdecadal variability of Atlantic Meridional Overturning Circulation under global warming
Publication TypeJournal Article
Year of Publication2016
AuthorsCheng J., Liu Z.Y, Zhang S.Q, Liu W, Dong L.N, Liu P., Li H.L
JournalProceedings of the National Academy of Sciences of the United States of America
Volume113
Pagination3175-3178
Date Published2016/03
Type of ArticleArticle
ISBN Number0027-8424
Accession NumberWOS:000372488200036
KeywordsAtlantic 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
Abstract

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.

DOI10.1073/pnas.1519827113
Student Publication: 
No