V. M. Zhurbas* and V. T. Paka**
* Shirshov Institute of Oceanology, Russian Academy of Sciences, ul. Krasikova 23, Moscow, 117218 Russia
** Shirshov Institute of Oceanology (Atlantic Branch), Russian Academy of Sciences,
pr. Mira 1, Kaliningrad, 236000 Russia
Received August 24, 1995
Abstract—Results of fine-structure CTD measurements in a scanning mode in the Gotland basin are discussed.
Data were obtained in April 1993, within 2–3 months after the last major inflow of the North Sea waters into
the Baltic Sea in January 1993. Pronounced intrusions with numerous temperature inversions were recognized
in the halocline. The front of the intrusive layering propagated northward of the Slupsk trench and reached the
Gotland deep three weeks later than the first indications of bottom water renewal were recorded. The intensity
of intrusions alternated with a typical horizontal scale of 10–20 km. The dependence between the intensity of
intrusions and the planetary potential vorticity in isopycnic layers was established, which indicates that there is
a genetic relationship between intrusions and mesoscale eddies. An intrusive layering is regarded as the most
likely mechanism of halocline ventilation during major inflows of North Sea waters into the Baltic.
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