JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Oral

A (Atmospheric and Hydrospheric Sciences) » A-OS Ocean Sciences & Ocean Environment

[A-OS16] [EE] Interdisciplinary ocean studies for global change

Mon. May 22, 2017 10:45 AM - 12:15 PM 303 (International Conference Hall 3F)

convener:Michio Kawamiya(Japan Agency for Marine-Earth Science and Technology), Shin-ichi Ito(Atmosphere and Ocean Research Institute, The University of Tokyo), Haruko Kurihara(University of the Ryukyus), Shoshiro Minobe(Graduate School of Science, Hokkaido University), Chairperson:Michio Kawamiya(Japan Agency for Marine-Earth Science and Technology)

11:25 AM - 11:40 AM

[AOS16-03] Reduced interdecadal variability of Atlantic Meridional Overturning Circulation under global warming

*Jun Cheng1, Zhengyu Liu1 (1.NUIST Nanjing University of Information Science and Technology)

Keywords:global warming, AMOC, interdecadal variability

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 ∼50 y to ∼20 y, and the amplitude is reduced by ∼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.