Excess seawater salinity in the Puck Lagoon, a shallow part of Puck Bay (southern Baltic Sea)

New detailed results on seawater salinity in the shallow part of Puck Bay (Puck Lagoon) obtained during the summer of 2020–2022 are presented. Water with salinity >7.5 g∙kg−1, even up to 7.7 g∙kg−1, occupied most of the lagoon area. The water in Puck Lagoon was clearly more saline than the water in the surface layer in the deep part of Puck Bay. A hypothesis is formulated that the observed increase in salinity in the Puck Lagoon was caused by sea surface evaporation when precipitation was distinctly reduced.