Are there weekly cycles in occurrence frequencies of large‐scale circulation types?

摘要

The existence of weekly cycles in occurrence frequency distributions of circulation types is examined on the basis of a comprehensive data base of automated circulation‐type classifications for the greater North Atlantic European region and sub‐domains during the period 1957–2002. The main result is that the percentage of circulation types for which a statistical significant weekly cycle (95% level of confidence) could be detected by a chi‐square goodness‐of‐fit test does not exceed the number that would be expected by chance. Thus it is concluded that no consistent weekly cycles in occurrence frequencies of circulation types exist. Copyright ? 2012 Royal Meteorological Society.