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Collapse and reorganisation of the Southern Ocean overturning under global warming in a coupled model


Bi, D and Budd, WF and Hirst, AC and Wu, X, Collapse and reorganisation of the Southern Ocean overturning under global warming in a coupled model, Geophysical Research Letters, 28, (20) pp. 3927-3930. ISSN 0094-8276 (2001) [Refereed Article]

DOI: doi:10.1029/2001GL013705


This study investigates the long-term behaviour of the thermohaline circulation (THC) in the CSIRO climate model, under a scenario of transient increase of atmospheric (equivalent) CO2 concentration followed by a perpetual stabilisation at triple the initial level (3 X CO2). The North Atlantic Deep Water Formation (NADWF) declines substantially and the Antarctic Bottom Water Formation (AABWF) essentially ceases by the time of CO2 tripling. During the subsequent millennium of stable 3 X CO2, NADWF recovers slightly but the AABWF shows no sign of returning and the residual deep overturning dies away. Accelerating the convergence to equilibrium of the deep ocean under the 3 X CO2 condition, the global THC eventually reaches a near-stable state with the entire ocean warming by about 7°C, NADWF fully recovered and AABWF partly re-established. This result shows a possible new quasi-equilibrium of the ocean under long-term global warming induced by the anthropogenic CO2 increase.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Oceanic processes (excl. in the Antarctic and Southern Ocean)
UTAS Author:Bi, D (Mr Daohua Bi)
UTAS Author:Budd, WF (Professor William Budd)
UTAS Author:Wu, X (Dr Xingren Wu)
ID Code:23414
Year Published:2001
Web of Science® Times Cited:28
Deposited By:IASOS
Deposited On:2001-08-01
Last Modified:2002-06-12

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