why salinity of the baltic sea is extremely low
Answers
The water in the Baltic Sea is brackish with a low salinity – a unique mixture of salty and fresh waters. The salinity of the Baltic Sea water is only approximately 20% of the salinity of the oceans (35 per mille). Furthermore, the salinity of the Baltic Sea’s surface water reduces towards the North, and the water in the Bay of Bothnia and at the bottom of the Gulf of Finland is almost fresh.
Compared to the oceans, the Baltic Sea is a small and shallow body of water. The average depth of the Baltic Sea is only 54 metres, whereas the average depth of the Atlantic, for example, is around four kilometres, and even the Mediterranean’s average depth is one around 1.5 kilometres. The deepest basin in the Baltic Sea is 450 metres deep. The Baltic Sea is linked to the North Sea via the narrow Danish straits, and the turnover of the water is very slow. Theoretically, it has been estimated that the turnover of the entire volume of water of the Baltic Sea takes approximately 30 years. Due to the slow water turnover, environmental toxins and eutrophying nutrients remain in the Baltic Sea and cause long-term effects.
Explanation:
Baltic sea is located in temperate region and is a part of Northern Atlantic Ocean .
Baltic sea is a landlocked sea and hence ocean current of Atlantic Ocean do not make change in its properties.
Despite being a landlocked sea , less temperature , less evaporation and good supply of fresh water due to melting of ice caps resulted in less salinity of Baltic sea.
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