The Baltic Sea is one of the biggest brackish seas in the world with limited exchange with the open sea through the Danish straits. The salinity of the Baltic Sea east of 13°E ranges between 13 g/kg at the bottom in the central Baltic Sea and 2 g/kg at the surface in the Bothnian Bay (cf. Figure 1).
Why is the Baltic Sea not salty?
The unique Baltic Sea. The Baltic Sea is the youngest sea of our planet. … Due to massive freshwater runoff from the land and limited salt water inflows from the Danish straits, the salinity of the Baltic Sea is much lower than that of the oceans, and the water is considered to be brackish water instead of sea water.
Why is the Baltic Sea brackish?
Salinity. The Baltic Sea’s salinity is much lower than that of ocean water (which averages 3.5%, or 35 parts per thousand), as a result of abundant freshwater runoff from the surrounding land; indeed, runoff contributes roughly 1/40th its total volume.
Who pollutes the Baltic Sea?
The Baltic Sea is almost totally surrounded by land and therefore more endangered by pollution than other marine areas. The sources of marine pollution are municipal and industrial waste inputs directly into the sea or via rivers, and atmospheric inputs mainly from traffic and agriculture.
Are there sharks in the Baltic?
Contrary to popular belief, there are sharks in the Baltic Sea. In fact, 31 species of sharks and closely related skates, rays and chimaeras (collectively known as cartilaginous fishes) have been recorded in this area.
Is the Baltic Sea a lake?
The first map shows the Baltic Ice Lake 14,500 – 11,500 years ago, which is a fresh water lake. … The influx of salt water stops, and the Baltic Sea becomes a closed fresh water lake again. Through the continous melting of the ice, the water level rises by 5-10 cm per year.
What lives in the Baltic Sea?
The Baltic Sea
|Herring – eastern||Clupea harengus||moderate|
|Salmon (main basin and Gulf of Bothnia)||Salmo salar||high|
|Salmon (Gulf of Finland)||Salmo salar||high|
Which is the youngest sea on the earth?
The Baltic Sea in Scandinavia is the world’s youngest sea having formed between 10 thousand and 15 thousand years ago from glacial erosion. It contains a unique mixture of saltwater and freshwater, making it the largest brackish water body on the planet.
Which sea has lowest salinity?
The Arctic Ocean’s salinity varies seasonally as the ice cover melts and freezes; but it is the lowest on average due to low evaporation and heavy freshwater inflow from rivers.
What did the Romans call the Baltic Sea?
The also saw the Estonian coast and the tribes living there, but they called the Baltic Sea Mare Suebicum after the Germanic Schwabic tribes. One Roman traveller brought back Baltic amber, which had been traded for 1.500 years with the South via the Amber Road.