Emission of CO2 Levels Higher In Antarctica Than Believed
The team used the pH measurements to calculate the amount of dissolved carbon dioxide, and then uses that to figure out how strongly the water is absorbing or emitting carbon dioxide to the atmosphere.
The open water nearest to the sea ice surrounding Antarctica releases significantly more carbon dioxide in winter than previously believed, showed a study conducted using an array of robotic floats.
The robotic floats diving and drifting in the Southern Ocean around the southernmost continent made it possible to gather data during the peak of the Southern Hemisphere’s winter from a place that remains poorly studied, despite its role in regulating the global climate.
“These results came as a really big surprise, because previous studies found that the Southern Ocean was absorbing a lot of carbon dioxide,” said lead author Alison Gray, Assistant Professor at the University of Washington.
In the Southern Ocean region, carbon atoms move between rocks, rivers, plants, oceans and other sources in a planet-scale life cycle.
It is also among the world’s most turbulent bodies of water, which makes obtaining data extremely difficult.
According to the study published in the journal Geophysical Research Letters, the floating instruments collected the new observations. The instruments dive down to 1 km and float with the currents for nine days.
Next, they drop even farther, to 2 km, and then rise back to the surface while measuring water properties.
After surfacing they beam their observations back to shore via satellite.
Unlike more common Argo floats, which only measure ocean temperature and salinity, the robotic floats also monitor dissolved oxygen, nitrogen and pH — the relative acidity of water.
The study analysed data collected by 35 floats between 2014 and 2017.
The team used the pH measurements to calculate the amount of dissolved carbon dioxide, and then uses that to figure out how strongly the water is absorbing or emitting carbon dioxide to the atmosphere. (IANS)
This flamboyant nine-metre-long dhow, made from 10 tonnes of plastic waste collected from Kenyan beaches and roadsides, sailed more than 500 km from the idyllic island of Lamu to Zanzibar this year with a message to eliminate single-use plastics.
And it also reminds the global policy-makers the urgency to address and lessen the growing impact of plastics on the world’s marine environment.
The Flipflopi dhow was positioned right at the entrance of the conference venue in the UN Environment headquarters in Nairobi where over 4,700 delegates from 170 countries gathered for the week-long UN Environment Assembly, the world’s highest-level decision-making body on the environment.
“Marine plastic litter pollution is already affecting more than 800 marine species through ingestion, entanglement and habitat change,” UN Environment’s coral reef unit head Jerker Tamelander said.
“Waste continues to leak from land and coral reefs are at the receiving end. They also trap a lot of fishing gear as well as plastic lost from aquaculture. With the impacts of climate change on coral reef ecosystems already significant, the additional threat of plastics must be taken seriously.”
The majority of marine litter – between 60-80 per cent – is composed of plastic.
Only nine per cent of the nine billion tonnes of plastic the world has so far produced has been recycled.
The overwhelming majority of plastics – comprising drinking bottles, bottle caps, food wrappers, grocery bags, lids and straws – are designed to be thrown away after a single use, ultimately ending up in landfills and polluting the environment.
“The first leg of the journey is over, but the journey continues,” Kenyan entrepreneur and Flipflopi project leader Dipesh Pabari told reporters here.
“When you are on the boat and you come to know that it’s made from your toothbrushes and Pet bottles. You will ask how and that is the real story,” he said.
Coming from a family of carpenters and dhow builders in Lamu, an island off the North Coast of Kenya, Ali Skanda is intimately familiar with what goes into building a dhow – a sailboat that has been used in East Africa for more than a thousand years.
On its maiden 500-km-long sojourn, supported by the UN Environment’s Clean Seas campaign, the Flipflopi stopped at towns and cities to sensitize the communities on ways to cut down use of single-use plastics.
A report, Plastics and Shallow Water Coral Reefs, released at this UN Environment Assembly, which focus on innovative solutions for environmental challenges, identifies a number of knowledge gaps that must be addressed to strengthen the scientific evidence base for action on marine plastics that impact coral reefs.
Inspired by 15-year-old Swedish climate activist Greta Thunberg, activist Rebecca Freitag, 26, a UN delegate for sustainable development from Germany, told IANS that the youth should be given participation in environment talks as they comprised 25 per cent of the global population.
Before coming to the UN summit, she collected the plastic waste from roadsides of Kenya, which introduced the world’s toughest laws on single-use plastic bags two years ago, and got her dress stitched to spotlight solutions for the growing impact of plastics on the world’s marine environment.
The Flipflopi is now ready for a voyage next month for a greater political and social awareness of the issue of plastic pollution.
“Now we want to build a 20-m long boat that is capable of sailing to South Africa and beyond,” Pabari said.
For this, $1.5 million is required.
The Flipflopi team has had to pioneer new techniques to craft the dhow’s various components.