The detection of changes in baroclinicity and synoptic activity on the northern hemisphere for the period 1967-94 using two data sets

The detection of changes in baroclinicity and synoptic activity on the northern hemisphere for the period 1967-94 using two data sets

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Intensified deep cyclones over the North Atlantic - especially at the beginning of the 1990s - led to the supposition, that the meridional temperature gradient of the troposphere could have been strengthened within the last decades.In this study northern hemispheric Notepad tropospheric temperatures and synoptic activity - in terms of barodinicity and the interdiurnal variability of geopotential heights (IDV) - in the period 1967-94 are examined.It has been found that the lower tropospheric temperature gradients as well as the synoptic activity increased in that period especially in the cyclogenetic centres over Newfoundland and over the Northwest Pacific, leading to an enforcing of meridional heat exchange processes due to synoptic eddies.

This result could be found with Audio Turntable Cartridge two independent data sets: with analysis data of the German Weather Service (DWD) and with the Comprehensive Ocean-Atmospheric Data Set (COADS).The close connection between the solenoidal term and the synoptic activity, represented by the IDV, can be presented as another instructive result of the study.