Date : 14/06/2023

Relevance – GS Paper 3 : Environmental Issues

Key Words – Overturning circulation, Ocean currents, Deep ocean animal, Greenhouse gas emmision, Global warming

Context –

• Off the coast of Antarctica, trillions of tons of cold, salty water sink to great depths.
• As the water sinks, it drives the deepest flows of the “overturning” circulation.
• This circulation is a network of strong currents spanning the world’s oceans.
• The overturning circulation carries heat, carbon, oxygen and nutrients around the globe.
• It also fundamentally influences climate, sea level and the productivity of marine ecosystems.

Scientists said that Antarctic meltwater is slowing ocean currents and threatening the collapse of our vital ocean ‘overturning.’

Antarctic meltwater adds freshwater to oceans –

• Our new research, published March 29, 2023, in the peer-reviewed journal Nature, uses new ocean model projections to look at changes in the deep ocean out to the year 2050.
• Our projections show a slowing of the Antarctic overturning circulation and deep ocean warming over the next few decades. Physical measurements confirm these changes are already well underway.
• Climate change is to blame. As Antarctica melts, more freshwater flows into the oceans. This disrupts the sinking of cold, salty, oxygen-rich water to the bottom of the ocean.
• From there this water normally spreads northward to ventilate the far reaches of the deep Indian, Pacific and Atlantic Oceans. But that could all come to an end soon. In our lifetimes.

The overturning circulation

• Antarctica sets the stage for the world’s greatest waterfall. The action takes place beneath the surface of the ocean. Here, trillions of tonnes of cold, dense, oxygen-rich water cascade off the continental shelf and sink to great depths. This Antarctic “bottom water” then spreads north along the sea floor in deep ocean currents, before slowly rising, thousands of kilometres away.
• In this way, Antarctica drives a global network of ocean currents called the “overturning circulation” that redistributes heat, carbon and nutrients around the globe. The overturning is crucial to keeping Earth’s climate stable. It’s also the main way oxygen reaches the deep ocean.
• But there are signs this circulation is slowing down and it’s happening decades earlier than predicted. This slowdown has the potential to disrupt the connection between the Antarctic coasts and the deep ocean, with profound consequences for Earth’s climate, sea level and marine life.
• As part of this overturning, about 250 trillion tons of icy-cold Antarctic surface water sinks to the ocean abyss each year. The sinking near Antarctica is balanced by upwelling at other latitudes. The resulting overturning circulation carries oxygen to the deep ocean and eventually returns nutrients to the sea surface, where they support marine life.
• If the Antarctic overturning slows down, nutrient-rich seawater will build up on the seafloor, five kilometers (three miles) below the surface. These nutrients won’t be available to marine ecosystems at or near the surface, damaging fisheries.
• Changes in the overturning circulation could also mean more heat gets to the ice. That’s particularly true around West Antarctica, the area with the greatest rate of ice-mass loss over the past few decades. This would accelerate global sea-level rise.
• An overturning slowdown would also reduce the ocean’s ability to take up carbon dioxide, leaving more greenhouse gas emissions in the atmosphere. And more greenhouse gases means more warming, making matters worse.
• Meltwater-induced weakening of the Antarctic overturning circulation could also shift tropical rainfall bands around a thousand kilometers (600-plus miles) to the north.
• Put simply, a slowing or collapse of the overturning circulation would change our climate and marine environment in profound and potentially irreversible ways.

Signs of worrying change

• Making observations of bottom water is challenging. The Southern Ocean is remote and home to the strongest winds and biggest waves on the planet. Access is also restricted by sea ice during winter, when bottom water forms.
• This means observations of the deep Southern Ocean are sparse. Nevertheless, repeated full-depth measurements taken from ship voyages have provided glimpses into the changes underway in the deep ocean. The bottom water layer is getting warmer, less dense and thinner.
• Satellite data shows the Antarctic ice sheet is shrinking. Ocean measurements taken downstream of regions of rapid melt show the meltwater is reducing the salinity (and density) of coastal waters.
• These signs point to a worrying change, but there are still no direct observations of the deep overturning circulation.

Why does this matter?

Freshening of shelf waters reduces the flow of dense water and slows the deepest parts of the overturning circulation while also reducing deep oxygenation.

• As the flow of bottom water slows, the supply of oxygen to the deep ocean declines. The shrinking oxygen-rich bottom water layer is then replaced by warmer waters that are lower in oxygen, further reducing oxygen levels.
• Ocean animals, large and small, respond to even small changes in oxygen. Deep-ocean animals are adapted to low oxygen conditions but still have to breathe. Losses of oxygen may cause them to seek refuge in other regions or adapt their behaviour. Models suggest we are locked in to a contraction of the “viable” environment available to these animals with an expected decline of up to 25%.
• Slowdown of the overturning may also intensify global warming. The overturning circulation carries carbon dioxide and heat to the deep ocean, where it is stored and hidden from the atmosphere. As the ocean storage capacity is reduced, more carbon dioxide and heat are left in the atmosphere.
• This feedback accelerates global warming.
• Reductions in the amount of Antarctic bottom water reaching the ocean floor also increases sea levels because the warmer water that replaces it takes up more space (thermal expansion).

What steps are being taken by scientists –

• We combined different types of observations in a new way, taking advantage of each of their strengths.
• The full-depth measurements collected by ships provide snapshots of ocean density, but are usually repeated about once a decade. Moored instruments, on the other hand, provide continuous measurements of density and speed, but only for a limited time at a particular location. We developed a new approach that combines ship data, mooring records, and a high resolution numerical simulation to calculate the strength of Antarctic bottom water flow and how much oxygen it transports to the deep ocean. Our study focused on a deep basin south of Australia that receives bottom water from several sources. These sources lie downstream of large meltwater inputs, so this region is likely to provide an early warning of climate-induced deep ocean changes.
• The findings are striking. Over three decades, between 1992 and 2017, the overturning circulation of this region slowed by almost a third (30%) causing less oxygen to reach the deep. This slowing was caused by freshening close to Antarctica. We found this freshening reduces the density and volume of Antarctic bottom water formed, as well as the speed at which it flows.
• The observed slowdown would have been even greater if not for a short-lived climate event that drove a partial and temporary recovery of bottom water formation. The recovery, driven by increased salinity, further illustrates the sensitivity of bottom water formation to salinity changes on the Antarctic continental shelf. Worryingly, these observations show that changes predicted to occur by 2050 are already underway.

Conclusion –

• Ice loss from Antarctica is expected to continue, even accelerate, as the world warms. We are almost certain to cross the 1.5 degree Celsius global warming threshold by 2027. More ice loss will mean more freshening, so we can anticipate the slowdown in circulation and deep oxygen losses will continue.
• The consequences of a slowdown will not be limited to Antarctica. The overturning circulation extends throughout the global ocean and influences the pace of climate change and sea level rise. It will also be disruptive and damaging for marine life.
• Our research provides yet another reason to work harder – and faster – to reduce greenhouse gas emissions.

Source – The Indian Express