AMOC response to global warming: dependence on the background climate and response timescale

• Published in: Climate Dynamics
• Main Authors: Zhu, Jiang, Liu, Zhengyu, Zhang, Jiaxu, Liu, Wei
• Other Authors: Zhu, J (reprint author), Univ Wisconsin, Dept Atmospher & Ocean Sci, 1225 W Dayton St, Madison, WI 53706 USA., Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI 53706 USA., Univ Wisconsin, Ctr Climat Res, Madison, WI 53706 USA., Peking Univ, Lab Climate & Ocean Atmosphere Studies, Sch Phys, Beijing 100871, Peoples R China., Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA., Univ Wisconsin, Dept Atmospher & Ocean Sci, 1225 W Dayton St, Madison, WI 53706 USA.
• Format: Journal/Newspaper
• Language: English
• Published: CLIMATE DYNAMICS 2015
• Subjects: Atlantic meridional overturning circulation; Carbon dioxide; Last glacial maximum; Sea ice; Timescale; MERIDIONAL OVERTURNING CIRCULATION; ATLANTIC THERMOHALINE CIRCULATION; SEA-ICE; NORTH-ATLANTIC; SOUTHERN-OCEAN; CO2 CONCENTRATION; MODEL; DEGLACIATION; SENSITIVITY; Southern Ocean; North Atlantic
• Online Access: https://hdl.handle.net/20.500.11897/419756; https://doi.org/10.1007/s00382-014-2165-x

This paper investigates the response of the Atlantic meridional overturning circulation (AMOC) to a sudden doubling of atmospheric CO2 in the National Center for Atmospheric Research Community Climate System Model version 3, with a focus on differences under different background climates. The findings reveal that the evolution of the AMOC differs significantly between the modern climate and the last glacial maximum (LGM). In the modern climate, the AMOC decreases (by 25 %, 4 Sv) in the first 100 years and then recovers slowly (by 6 %, 1 Sv) by the end of the 1,500-year simulation. At the LGM, the AMOC also weakens (by 8 %, 1 Sv) in the initial 90 years, but then recovers, first rapidly (by 30 %, 4 Sv) over the following 300 years, and then slowly (by 13 %, 1.6 Sv) during the remainder of the integration. These results suggest that the responses of the AMOC under both climates have a similar initial rapid weakening period of similar to 100 years and a final slow strengthening period over 1,000 years long. However, additional intermediate period of similar to 300 years does occur for the LGM, with rapidintensification in the AMOC. Analyses suggest that the rapid intensification is triggered and sustained primarily by a coupled sea ice-ocean feedback: the reduction of meltwater flux in the northern North Atlantic-associated with the remarkable sea-ice retreat at the LGM-intensifies the AMOC and northward heat transport, which, in turn, causes further sea-ice retreat and more reduction of meltwater. These processes are insignificant under modern conditions. National Natural Science Foundation of China (NSFC) [41130105]; Ministry of Science and Technology of China (MOST) [2012CB955200]; U.S. National Science Foundation; Department of Energy SCI(E) ARTICLE [e-mail]; [e-mail] 11-12 3449-3468 44