For decades, the Indian Ocean has been known for some of the saltiest waters on Earth. But it seems that’s changing. Experts say parts of the Southern Indian Ocean have become noticeably “fresher” over the last 60 years. Some reports suggest salinity has dropped by roughly 30 per cent. It might not sound like much, but ocean salt isn’t just about taste. It affects currents, climate, rainfall patterns, and marine life. For India, the implications could be serious. Monsoons, fisheries, and even coastal weather might feel the effects. As reported by the University of Colorado Boulder, titled, ‘One of the saltiest parts of the ocean is getting fresher’ reveals the Southern Indian Ocean off the west coast of Australia is becoming less salty at a surprising rate and scientists are watching closely.

Southern Indian Ocean’s salt levels are dropping fast: Experts say

Historically, the waters south of Australia were some of the saltiest anywhere. Thick, briny, dense. Ships crossing the area long noted it. But measurements now show a big change. Experts say fresh water is flowing into the region, diluting the salty seas. It’s reportedly like adding 60 per cent of Lake Tahoe’s water every year. Researchers have been tracking these shifts with buoys, satellites, and sensors on ships. Models seem to confirm it. The ocean is “freshening.” Winds and currents are changing, experts say. Global warming is nudging water around in ways we hadn’t fully expected.

How changes in the ocean affect weather and climate

Fresh water from the Indo-Pacific region is being pushed south, into the Southern Indian Ocean. The result: less salty water in a region that used to be dense and heavy. Saltier water sinks. Fresher water floats. When the balance shifts, it can affect ocean circulation. And that, in turn, can ripple across global climate systems. Experts warn this isn’t just a local thing. The Indian Ocean is key to monsoons. It drives rainfall patterns over the subcontinent. If currents change, rain could come at different times, or be heavier or lighter than usual. Fisheries might also feel it. Salinity affects marine ecosystems, plankton, and fish migration. Even the weather along the coast could shift slightly.It’s not just India, though. European and African climates could be nudged by changes here. Oceans are interconnected. A subtle shift in one part can trigger effects thousands of kilometres away. It seems small changes can have surprisingly big impacts.Researchers are reportedly ramping up monitoring. More buoys, satellites, and research vessels are being deployed. Models are being updated to account for warming, freshening, and acidification.