Robots roaming in Antarctic waters say that Ross Ice Shelf melts quickly in summer

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Robots roaming in Antarctic waters say that Ross Ice Shelf melts quickly in summer

The new paper puts a new look on the forces that have caused the melting of the world’s largest glacier.

The Ross Ice shelf, part of the Antarctic ice sheets, is several hundred meters long and has an area of ​​480,000 square kilometers, almost the size of Spain.

The size, and the fact that the thin ice shelf will accelerate the flow of ice sheets to the sea in Antarctica, it means that there is a lot of potential for sea level rise in melting.

By the melting of snow shelves like Ross, the sea can rise above several feet in the next few centuries.

A study published in the Geophysical Research Journal helps the oceans detect local factors, which affect the stability of Ross’s ice shelf and predict how this will change and it will have an impact on the future sea level.

Previous studies have focused on the melting of the ice shelf on global warming. After three years of Rosetta’s figures, it shows that the Ross Ice Shelf melts due to the local surface water, and it is in the unexpected part of the shelf by melting it.

This study comes from the Rosetta-Ice project in Antarctica, a collection of three years of geological and oceanographic data. This project is very large in scope, in which there is a multi-disciplinary and multi-disciplinary team with special polar data collection devices.

New Way

The Rosetta team needed data on the temperature, salinity, depth and circulation of sea around the ice shelf.

Traditionally, these oceanographic data are obtained in two ways: research trips and deep anchors. Since sea ice is covered with sea ice for most of the year, therefore, ship-based measurements are restricted in the summer of Upper Australia for a short time.

On the other hand, established sensors can collect data for many years; However, they are generally not deployed more than 200 meters below the surface of the water to avoid the escape of icebergs, thus providing a less complete picture of what is happening around the ice shelf.

Rasheed scientists found a new way of collecting data from Ross Sagar. They deployed the “Independent Micro-Air Controller” or ALAMO, six side buoys.

They set up parachutes on boats and drove them down from the plane of the New York State National Guard by 2,500 feet above ice water.

The equipment was programmed to avoid sea ice, which could damage their external sensors and antennas. Apart from this, the team adopted a new method by sowing “parking” on the seabed between the profiling to reduce its drift on the sea currents.

Boom collected data of temperature and salinity from the sea to the surface, and every day the data was sent to the team through the satellite. Three years ago, seven other sowing published from a ship, away from the ice shelf, provided the record of the position of the sea in the north.

Local influence

Somewhere else in Antarctica, ice shelves are melted from the depths of the ocean to warmer, global flows, “said Dave Porter, a scientist from the Lamont Earth Observatory.

Damage to, and the answer is that, primarily because local meteorological processes on the front of the ice. ”

The team found that the main source of heat of the sea, which causes the melting of the ice shelf, is the sun which heats the upper ocean after the sea ice disappears in the region in summer; Sea ice reflects the sunlight while being absorbed by deep sea water.

The team measured the large amount of fresh water quickly in the Ross Sagar before melting ice shelves coming in the east of Ross Sagar.

Once this extra fresh water reaches the ice front, it changes the method of heat mixing from the surface to the ice shelf where the fusion occurs, from which the team concludes that the stability of the future Ross Cliff Amunen depends on the ocean’s changing coastal conditions. Close to the ice shelf in front

Scientists have observed that heating the oceans and melting the ice shelf may occur in the summer season, when the sea is free from ice, it lengthened – for example, if the local air that has the sea ice Pushing away from the ice shelf, it changes, giving more sunshine to reach the surface of the sea.

Scott Springer, co-author of Earth and Space Research, said, “The new way to collect data from continental shelves in Antarctica is to understand the future sea changes in the Antarctic ice sheet about the future sea changes surrounding the Antarctic.

Provides a new way to verify the reliability of the numerical model used for ” South “.

The importance of local conditions near the ice front also shows that the researchers should find them.

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