E. M. Emel’yanov and V. A. Kravtsov
Atlantic Division, Shirshov Institute of Oceanology, Russian Academy of Sciences, Kaliningrad, Russia
Received February 28, 2000; in final form, June 20, 2000
Abstract—Studies of the hydrochemical environment at the moment of a short-term minor penetration of
transformed North Sea waters in May 1998 on the southeastern slope of the Gotland Depression showed a sharp
increase in the salinity and temperature of the water and oxygen concentration in the near-bottom layer 10–15m
thick at sea depths of 70–100 m forming characteristic “anomalous” water layers. From May to July 1998, in
the near-bottom layer, simultaneously with the changes in the oxidation–reduction environment, the balance of
the forms of phosphorus also changed toward an increase of the proportion of its inorganic forms (phosphates)
as compared to the organic forms. This suggests a more complete oxidation of the organic matter during the
summer period. In the summer, a significant increase in the concentrations of dissolved forms of Fe and Mn (by
an order of magnitude) together with a significant decrease in the oxygen concentration in the near-bottom
waters (by a factor of 1.5–2) was noticed. Meanwhile, in July 1998, a sharp drop in the dissolved Zn concen-
tration in the intermediate and near-bottom layers of the water column as compared to May of this year (by a
factor of 2–4) was observed.
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