Publication at Faculty of Science |
2009
Abstract
We analyze the lifetimes (persistence) of circulation types using 23 classifications (of which 18 are objective and 5 subjective) in the period 1957–2002 over Europe and its sub-regions. Significant seasonal trends in the lifetime (both positive and negative) are fairly scarce, and are present in all seasons in the manual catalogues only.
In the subjective Hess-Brezowsky catalogue, there is an abrupt shift towards higher persistence in 1986, whereas in the Hungarian manual catalogue a smaller but significant negative shift took place in the same year. These statistical inconsistencies probably result from inhomogeneities in the subjective catalogues.