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CMIP6 Model Biases in the Atlantic Meridional Overturning Circulation and Global Sea Surface Temperature: The Role of Indian Ocean Temperature

Presentation Date
Friday, December 15, 2023 at 8:30am - Friday, December 15, 2023 at 12:50pm
MC - Poster Hall A-C - South



There is growing evidence that the Atlantic Ocean circulation and climate could be influenced by Indian Ocean warming through teleconnections. Specifically, it has been recently uncovered that Indian Ocean warming, a salient feature of global warming, can strengthen the Atlantic meridional overturning circulation (AMOC) through atmospheric teleconnections. Thus, it implies that Atlantic mean-state model biases can potentially be in part related to Indian Ocean sea surface temperature (SST) biases. In this study, we will firstly present results on model biases in global SST and the AMOC intensity in Coupled Model Intercomparison Project Phase 6 (CMIP6) models. Further, whether such global SST and AMOC intensity biases are related to the Indian Ocean SST bias will be discussed, taking both multi-model mean and inter-model spread into consideration. Extending the CMIP6 model bias analysis, the implications for reducing the model biases of the AMOC and global SST in the Energy Exascale Earth System Model (E3SM) version 2, a newly developed state-of-the-art coupled climate model, will be discussed.

Funding Program Area(s)
Additional Resources:
NERSC (National Energy Research Scientific Computing Center)