[A-CG38] Climate Variability and Predictability on Subseasonal to Centennial Timescales

[ACG38-P05] Pacemaker hindcast experiments with MIROC6 contributing to the TBIMIP

*Takahito Kataoka¹ (1.JAMSTEC Japan Agency for Marine-Earth Science and Technology)

Keywords:climate predictions, tropical ocean basin interaction, coupled ocean-atmosphere model

Tropical ocean basins host large-scale climate variability, and interaction between them is of interest to the climate research community. Research on such interaction is often conducted through experiments with numerical models. However, modeling groups use different experimental setups, making it difficult to compare results. To address this issue, the Climate and Ocean - Variability, Predictability, and Change (CLIVAR) Research Focus on Tropical Basin Interaction has introduced an experimental protocol for examining interaction among the tropical basins: the tropical basin interaction model intercomparison project (TBIMIP). For the TBIMIP, we have conducted a series of hindcast experiments using the Model for Interdisciplinary Research on Climate version 6 (MIROC6). In a standard hindcast set, initialized predictions start every February 1 between 1982-2021, integrated for a year with 10 ensemble members. On the other hand, the other set, called pacemaker hindcast, consists of the initialized predictions as in the standard hindcast, except that sea surface temperature anomalies are nudged towards observed ones either in tropical Pacific, Atlantic, or Indian Oceans. By comparing these results, we aim to elucidate the role of tropical basins in the predictions of other basins. The results will be introduced in the presentation