On the BGC-representation of CMIP5 models around New Zealand and in the Ross Sea
This presentation summarizes two recent modelling studies which were based on CMIP5 model data in the Southern Ocean. The first study focuses on the New Zealand region were the subtropical front plays a crucial role as water mass boundary between subtropical and subantarctic water masses. Models which simulate the position of the subtropical front better tend show an improved BGC representation. The second part of the presentation focuses on the BGC representation in the Ross Sea were sea ice is a critical measure. In both studies a detailed model evaluation is presented. Clear outliers have been identified, and providing increased confidence about the future model projections of the remaining “inner” ensemble. An outlook about ongoing work in New Zealand within the Deep South project will be given.