NASA enlists a southern elephant seal to help gather data about changing currents and ocean temperatures around Antarctica
- An oceanographer working at the JPL fixed a hat-like sensor to en elephant seal
- The seal’s sensor gathered data as it swam over 3,000 miles around Antarctica
- The data shows warm water is being drawn up to the ocean surface
- This could limit the amount of solar energy the ocean can absorb in the future
This week, an oceanographer working at NASA’s Jet Propulsion Laboratory published the results of a three-month long study of ocean currents that flow around Antarctica, which was conducted with the help of a special assistant: a southern elephant seal.
The study looked at how the Antarctic Circumpolar Current influences the vertical movement of warm water at the ocean’s surface, something that could influence global weather events.
To gather data, the JPL’s Lia Siegelman equipped a southern elephant seal with a sensor that was glued to its head in a small hat-like housing.
Earlier this year, an oceanographer working with NASA’s Jet Propulsion Laboratory tagged a southern elephant seal with a head sensor (pictured above) to study the Antarctic Circumpolar Current
The sensor recorded the time, depth, and water temperature throughout every dive the seal made over a three month period this spring and early summer.
During that period, the seal traveled through more than 3,000 miles of Antarctic water.
Elephant seals can dive as many as 80 times a day at depths of up to 3,300 feet, and spend as much as two hours underwater at a time.
Data from the seal’s journey was combined with altimetry data from satellites—which capture information about ocean currents, wind direction, and wave height–revealing some unexpected new insights about how the Antarctic Circumpolar Current works.
Data from the seal’s sensor, showing water temperature and water movement, was combined with data from satellites to create a model of how the Antarctic Circumpolar Current works
The Current is a 13,000 mile loop that flows around Antarctica, driven by the confluence of smaller currents from the Atlantic, Pacific, and Indian Oceans.
The Current is filled with large, swirling eddies that form in near regions where water of different temperatures, and driven by different ocean currents, meet.
Southern elephant seals dive up to 80 times a day and can travel to depths of up to 3,300 feet
WHAT IS THE ANTARCTIC CIRCUMPOLAR CURRENT?
The Antarctic Circumpolar Current is a 13,000 mile loop of ocean water that flows around Antarctica.
The Current is driven by the confluence of smaller currents from the Pacific, Atlantic, and Indian Oceans, all of which meet around Antarctica.
It is the most important current in the Southern Ocean, and moves more water than any other current on Earth.
It is the only ocean current that flows around the globe.
It is responsible for absorbing and channeling warmer water away from Antarctica and helps keep the continent frozen.
These eddies operate as ‘small-scale fronts’ that create a kind of duct connecting water from the ocean surface to the ocean interior, at depths of up to 550 yards.
‘Most current modeling studies indicate that the heat would move from the surface to the ocean interior in these cases, but with the new observational data provided by the seal, we found that that’s not the case,’ Siegelman told NASA.
Instead, the data showed that warm water was being channeled from the ocean depths back up to the surface, something that could trigger precipitation or evaporation and potentially affect both local and global weather.
It could also limit the amount of energy from the sun that the ocean is able to absorb, causing some of that energy to be redirected into the atmosphere where it could affect weather patterns.
‘Inaccurate representation of these small-scale fronts could considerably underestimate the amount of heat transferred from the ocean interior back to the surface and, as a consequence, potentially overestimate the amount of heat the ocean can absorb,’ Siegelman explained.
‘This could be an important implication for our climate and the ocean’s role in offsetting the effects of global warming by absorbing most of the heat.’
WHAT DO RECENT STUDIES REVEAL ABOUT ANTARCTICA?
A special issue of Nature has published a series of studies looking at how monitoring Antarctica from space is providing crucial insights into its response to a warming climate.
Here are their key findings:
Three trillion tonnes of ice has been lost from Antarctica since 1992
The Antarctic Ice Sheet lost around three trillion tonnes of ice between 1992 and 2017, according to research led by Leeds University.
This figure corresponds to a mean sea-level rise of about eight millimetres (1/3 inch), with two-fifths of this rise coming in the last five years alone.
The finds mean people in coastal communities are at greater risk of losing their homes and becoming so-called climate refugees than previously feared.
In one of the most complete pictures of Antarctic ice sheet change to date, an international team of 84 experts combined 24 satellite surveys to yield the results.
It found that until 2012 Antarctica lost ice at a steady rate of 76 billion tonnes per year – a 0.2mm (0.008 inches) per year contribution to sea level rise.
However, since then there has been a sharp, threefold increase.
At some point since the last Ice Age, the West Antarctic Ice Sheet was smaller than it is today
Researchers previously believed that since the last ice age, around 15,000 years ago, the West Antarctic Ice Sheet (WAIS) was getting smaller
However, new research published by Northern Illinois University shows that between roughly 14,500 and 9,000 years ago, the ice sheet below sea level was even smaller than today.
Over the following millennia, the loss of the massive amount of ice that was previously weighing down the seabed spurred an uplift in the sea floor.
Then the ice sheet began to regrow toward today’s configuration.
‘The WAIS today is again retreating, but there was a time since the last Ice Age when the ice sheet was even smaller than it is now, yet it didn’t collapse,’ said Northern Illinois University geology professor Reed Scherer, a lead author on the study.
‘That’s important information to have as we try to figure out how the ice sheet will behave in the future’, he said.
The East Antarctic Ice Sheet was stable throughout the last warm period
The stability of the largest ice sheet on Earth is an indication to scientists that it could hold up as temperatures continue to rise.
If all the East Antarctic Ice Sheet melted, the sea level would rise by 175 feet (53 metres).
However, unlike the Greenland and West Antarctic ice sheets it seems it would be resistant to melting as conditions warm, according to research from Purdue University and Boston College.
Their research showed that land-based sectors of the East Antarctic Ice Sheet were mostly stable throughout the Pliocene (5.3 to 2.6 million years ago).
This is when carbon dioxide concentrations in the atmosphere were close to what they are today – around 400 parts per million.
‘Based on this evidence from the Pliocene, today’s current carbon dioxide levels are not enough to destabilise the land-based ice on the Antarctic continent,’ said Jeremy Shakun, lead author of the paper and assistant professor of earth and environmental science at Boston College.
‘This does not mean that at current atmospheric carbon dioxide levels, Antarctica won’t contribute to sea level rise.
‘Marine-based ice very well could and in fact is already starting to contribute, and that alone holds an estimated 20 meters of sea level rise,’ he said.
Decisions in the next decade will determine whether Antarctica contributes to a metre of sea level rise
One of the largest uncertainties in future sea-level rise predictions is how the Antarctic ice sheet reacts to human-induced global warming.
Scientists say that time is running out to save this unique ecosystem and if the right decisions are not made in the next ten years there will be no turning back.
Researchers from Imperial College London assessed the state of Antarctica in 2070 under two scenarios which represent the opposite extremes of action and inaction on greenhouse gas emissions.
Under the high emissions and low regulations narrative, Antarctica and the Southern Ocean undergo widespread and rapid change, with global consequences.
By 2070, warming of the ocean and atmosphere has caused dramatic loss of major ice shelves, leading to increased loss of grounded ice from the Antarctic Ice Sheet and an acceleration in global sea level rise.
Under the low emissions and tight regulations narrative, reduction of greenhouse gas emissions and implementation of effective policy helps to minimise change in Antarctica, which in 2070 looks much like it did in the early decades of the century.
This results in Antarctica’s ice shelves remaining intact, slowing loss of ice from the ice sheet and reducing the threat of sea level rise.
What saved the West Antarctic Ice Sheet 10,000 years ago will not save it today
The retreat of the West Antarctic ice masses after the last Ice Age was reversed surprisingly about 10,000 years ago, scientists found.
In fact it was the shrinking itself that stopped the shrinking: relieved from the weight of the ice, the Earth crust lifted and triggered the re-advance of the ice sheet.
According to research from the Potsdam Institute for Climate Impact Research (PIK) this mechanism is much too slow to prevent dangerous sea-level rise caused by West Antarctica’s ice-loss in the present and near future.
Only rapid greenhouse-gas emission reductions can, researchers found.
‘The warming after the last Ice Age made the ice masses of West Antarctica dwindle,’ said Torsten Albrecht from the Potsdam Institute for Climate Impact Research.
‘Given the speed of current climate-change from burning fossil fuels, the mechanism we detected unfortunately does not work fast enough to save today’s ice sheets from melting and causing seas to rise.’
The world’s ice shelves may be being destabilised by forces from above and below
Researchers found that warm ocean water flowing in channels beneath Antarctic ice shelves is thinning the ice from below so much that the ice in the channels is cracking.
Surface meltwater can then flow into these fractures, further destabilising the ice shelf and increasing the chances that substantial pieces will break away.
The researchers, led by the University of Texas at Austin, documented this mechanism in a major ice break up, or calving, event in 2016 at Antarctica’s Nansen Ice Shelf.
The findings are concerning because ice shelves, which are floating extensions of continental glaciers, slow down the flow of ice into the ocean and help control the rate of sea level rise, according to the study.
‘We are learning that ice shelves are more vulnerable to rising ocean and air temperatures than we thought,’ said Professor Christine Dow, lead author of the study.
‘There are dual processes going on here. One that is destabilising from below, and another from above.
‘This information could have an impact on our projected timelines for ice shelf collapse and resulting sea level rise due to climate change’, he said.
Source: Read Full Article