The Tropical Basin Interaction Model Intercomparison Project (TBIMIP)

Abstract. Large-scale interaction among the three tropical ocean basins is an area of intense research that is often conducted through experimentation with numerical models. A common problem is that modelling groups use different experimental setups, which makes it difficult to compare results and to delineate the role of model biases from differences in experimental setups. To address this issue, an experimental protocol for examining interaction among the tropical basins is introduced. The tropical basin interaction model intercomparison project (TBIMIP) consists of experiments in which sea surface temperatures (SSTs) are prescribed to follow observed values in selected basins. There are two types of experiments. One type, called standard pacemaker, consists of simulations in which SSTs are restored to observations in selected basins during a historical simulation. The other type, called pacemaker hindcast, consists of seasonal hindcast simulations in which SSTs are restored to observations during the forecast. TBIMIP is coordinated by the Climate and Ocean - Variability, Predictability, and Change (CLIVAR) Research Focus on Tropical Basin Interaction. The datasets from the model simulations will be made available to the community to facilitate and stimulate research on tropical basin interaction and its role in seasonal-to-decadal variability and climate change.