Circulation type classification is a commonly used tool to categorize the continuum of atmospheric circulation into discrete circulation types. Classifications of circulation types determined by different approaches are applied to various climate research topics, e.g. climate change, extreme events, model validation. At least from a methodological point of view circulation classifications are closely related to the concept of circulation regimes. Circulation type classifications and in particular the determination of circulation regimes assume the existence of inherently preferred states of the atmospheric circulation. However this assumption appears to be debatable as applying different classification methods often leads to differing results and moreover serious doubts on the existence of circulation regimes have recently been raised.
Thus this session will focus on the methodological aspects of circulation type classification and circulation regime analysis emphasizing the robustness and reproducibility of results and intends to stimulate the discussion on the existence of natural circulation types / regimes.
The session welcomes in particular contributions dealing with methodological approaches for circulation type classification and the determination of circulation regimes as well as related comparison studies. Papers discussing specific applications of circulation type classification / circulation regime analysis are also welcome.