Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 

New Antarctic research “a big step forward”

25 February 2019
New Antarctic research “a big step forward” in predicting impacts of climate change


The Ross Ice Shelf holds the key to avoiding catastrophic sea-level rises as the planet warms – and new research will help scientists monitor its future health.

An international team of researchers including New Zealand’s GNS Science took part in the ROSETTA-Ice project, mapping the sea floor under the ice shelf.

Their findings are published in Nature Geoscience magazine today.

The Ross Ice Shelf occupies an area twice the size of New Zealand and is within the Ross Dependency, the region of Antarctica over which New Zealand claims a right of sovereignty.

The shelf helps to slow the flow of Western Antarctica’s grounded sea ice into the ocean.

Most of the ice in West Antarctica sits on ground below sea level and is particularly vulnerable to increases in ocean temperature.

If all of this marine-based ice were released into the ocean, global sea level would rise by at least 3.5 metres in the coming centuries.

“Working with international partners allowed us to gather important data in an area where the floating ice shelf is often more than 300 metres thick,” GNS Science marine geophysicist Fabio Caratori Tontini says.

“GNS Science contributed not just our expertise, but our dynamic gravimeter, which measures the earth’s gravitational force from a moving aeroplane.

“This instrument makes measurements that allow us to model the shape of the sea floor under the ice – which is essential for understanding how the ocean circulates and how the ice melts.”

“We could see that a previously unmapped geological boundary was making the seafloor on the East Antarctic side much deeper than the West, and that affects the way the ocean water circulates under the ice shelf,” explained Kirsty Tinto, the Lamont-Doherty Earth Observatory research scientist who led all three field expeditions and is lead author of the study.

“This research will help scientists develop new ways of monitoring the health of Antarctic ice sheets,” GNS Science’s Environment and Climate theme leader Richard Levy says.

“We can use this research to help determine where to place instruments to observe ocean currents that circulate beneath the ice shelf.

“These observations can then guide computer models to predict how the Ross Ice Shelf and the West Antarctic Ice Sheet will change as our climate warms.

“Some studies suggest that collapse of the ice sheets can be avoided if we reduce greenhouse gas emissions and keep warming under 1.5 degrees centigrade above pre-industrial levels.

“This is the primary goal of New Zealand’s Zero Carbon Bill which is currently under consideration in Parliament.

“We need to know how Antarctica will respond to this relatively small amount of warming, and the ROSETTA team’s research is a big step forward.”

The Nature Geoscience article can be accessed here: https://www.nature.com/articles/s41561-019-0370-2

Click here for hi-res image of GNS Science's Fabio Caratori Tontini checking data quality on the gravity meter computer during a ROSETTA flight

The ROSETTA-Ice project partners include Lamont-Doherty Earth Observatory of Columbia University, Scripps Institution of Oceanography at the University of California San Diego, Colorado College, Earth and Space Research and GNS Science. Fieldwork was supported by the US Antarctic Program, the New York Air National Guard, the Ministry of Business, Innovation and Employment and the NZ Antarctic Research Institute. ROSETTA-Ice is funded by the National Science Foundation, the Moore Foundation and the Old York Foundation.


ends

© Scoop Media

 
 
 
Business Headlines | Sci-Tech Headlines

 

Up 0.5% In June Quarter: Services Lead GDP Growth

“Service industries, which represent about two-thirds of the economy, were the main contributor to GDP growth in the quarter, rising 0.7 percent off the back of a subdued result in the March 2019 quarter.” More>>

ALSO:

Pickers: Letter To Immigration Minister From Early Harvesting Growers

A group of horticultural growers are frustrated by many months of inaction by the Minister who has failed to announce additional immigrant workers from overseas will be allowed into New Zealand to assist with harvesting early stage crops such as asparagus and strawberries. More>>

ALSO:

Non-Giant Fossil Disoveries: Scientists Discover One Of World’s Oldest Bird Species

At 62 million-years-old, the newly-discovered Protodontopteryx ruthae, is one of the oldest named bird species in the world. It lived in New Zealand soon after the dinosaurs died out. More>>

Rural Employers Keen, Migrants Iffy: Employment Visa Changes Announced

“We are committed to ensuring that businesses are able to get the workers they need to fill critical skills shortages, while encouraging employers and regions to work together on long term workforce planning including supporting New Zealanders with the training they need to fill the gaps,” says Iain Lees-Galloway. More>>

ALSO:

Marsden Pipeline Rupture: Report Calls For Supply Improvements, Backs Digger Blame

The report makes several recommendations on how the sector can better prevent, prepare for, respond to, and recover from an incident. In particular, we consider it essential that government and industry work together to put in place and regularly practise sector-wide response plans, to improve the response to any future incident… More>>

ALSO: