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Atlantic Meridional Overturning Circulation: Variability and Mechanisms

  • 112 O&M Building, Texas A&M University (map)

Abstract

The Atlantic meridional overturning circulation (AMOC) is thought to play a major role in decadal and longer time-scale climate variability as well as in prediction of the earth’s future climate on these time scales. However, because only rather short records of continuous observational estimates of AMOC transports are available at very limited locations and only for the recent period, support for such a prominent role for AMOC primarily comes from ocean and coupled general circulation model simulations. Here, we examine representations of AMOC variability and mechanisms from i) a set of ocean – sea-ice coupled simulations participating in the second phase of the Coordinated Ocean-ice Reference Experiments (CORE-II); ii) a set of ocean reanalysis products; and iii) a set of fully-coupled Community Earth System Model (CESM) simulations in which some ocean model parameter values are changed within acceptable ranges. A major goal is identification of robust and non-robust elements of AMOC variability and mechanisms.