Oxygen is decreasing in the world’s oceans due to global warming, but a new change has been found in the Indian areas of the Southern Ocean, which is a good sign. According to a study by the National Center for Polar and Ocean Research (NCPOR), Goa, dissolved oxygen in water has increased between 1993 and 2025. The maximum change was found at a depth of 300 to 2,000 meters. Oxygen increased annually by 2.37 micromoles per kilogram of water in the Antarctic region and by 1.41 micromoles in the polar region. Indications of increase were also found at depths of 2,000 to 5,000 meters. According to scientists, with increase in temperature and salinity, the gap between water layers reduced and oxygenated water from the surface started getting better into the depth. Oxygen increased from 4.5 to 5.5 ml per liter. Comparing the figures of 2011 and 2025, oxygen increased from 4.5 to 5.5 ml per liter. The advantage of this is that marine vegetation has also increased in these areas. According to UNESCO’s Global Ocean Oxygen Network, adequate oxygen in water is essential for fish and other marine creatures to survive, grow and remain healthy. At the same time, oxygen in the world’s oceans has decreased by about 2% since the middle of the twentieth century. On the contrary, the increase in oxygen level in Indian areas is a good sign. What is dissolved oxygen in the sea? Some part of the oxygen present in the air dissolves in sea water. This is called dissolved oxygen. Sea creatures use this oxygen to breathe. The amount of oxygen in water depends on temperature, salinity, ocean currents, and the activities of organisms. Generally, cold water can dissolve more oxygen in itself than hot water. At which depth of the ocean is the oxygen condition most critical? The amount of oxygen in the sea is not the same at every depth. ———————-
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