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

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

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3927b&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 20, p. 3927-3930

Physics

14

Global Change, Global Change: Climate Dynamics, Global Change: Oceans, Oceanography: Physical: General Circulation

Scientific paper

This study investigates the long-term behavior 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 stabilization at triple the initial level (3×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×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×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.

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