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Since its first description in 1971 and its more extensive discussion in ,,The Sea'' by Sarkinsan (1977) the JBAR effect has been studied in numerous publications. Although it can be reduced to only one single term in the vorticity equations a large number of authors have focussed on this term. It can be suspected that also the interesting sounding acronym has played a role to increase the popularity of the JBAR effect. The report is split into two parts. It starts with general theoretical considerations concerning the JBAR effect, whereas in the second part, its distribution on the northwestern European shelf including the adjacent shelf break will be presented and discussed.

Already the theoretical considerations at the beginning will clearly demonstrated that in general the JBAR term is not a correct measure of the interaction between topography and baroclinicity as it has been anticipated by most authors in the last three decades. Moreover, it is not even a totally independent forcing term, which always was proclaimed. The calculations demonstrate, that the JBAR term is a correction term, which corrects an error introduced into the voracity equation caused by the specific method by which the voracity equation is derived..

Additional information

Authors: POHLMANN T, SAI, Ispra (IT)
Bibliographic Reference: EUR 19002 EN (1999), 26pp.
Availability: Available free of charge from by Documentation Unit JRC Ispra (IT)
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