By the year 1926, the salinity had increased (although it was also suspected that the salinity varies seasonally and depends on the distance from the mouth of the Jordan). Until the winter of 1978–79, when a major mixing event took place, the Dead Sea was composed of two stratified layers of water that differed in temperature, density, age, and salinity.
The Palestinian tourism industry has been met with setbacks in developing along the West Bank coast. The Dead Sea is receding at a swift rate; its surface area today is , having been in 1930.
Since the water near the bottom is saturated with NaCl, that salt precipitates out of solution onto the sea floor. Beginning in the 1960s, water inflow to the Dead Sea from the Jordan River was reduced as a result of large-scale irrigation and generally low rainfall.
By 1975, the upper water layer was saltier than the lower layer.
By the year 1926, the salinity had increased (although it was also suspected that the salinity varies seasonally and depends on the distance from the mouth of the Jordan). Until the winter of 1978–79, when a major mixing event took place, the Dead Sea was composed of two stratified layers of water that differed in temperature, density, age, and salinity.
In the early 1980s, the concentration of ionic species (in g/kg) of Dead Sea surface water was Cl− (181.4), Br− (4.2), SO42− (0.4), HCO3− (0.2), Ca2+ (14.1), Na+ (32.5), K+ (6.2) and Mg2+ (35.2).
With a salinity of 342 g/kg, or 34.2% (in 2011), it is one of the world's saltiest bodies of water – 9.6 times as salty as the ocean – and has a density of 1.24 kg/litre, which makes swimming similar to floating.
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