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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.

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Antarctica
Antarctic seas emit higher CO2 levels than previously thought: Study. Flcikr
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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.

CO2, Antarctica
Carbon atoms move between rocks, rivers, plants, oceans and other sources in a planet-scale life cycle. Flickr

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.

Antarctic-sea
The open water nearest to the ice surrounding Antarctica releases more carbon dioxide. IANS

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.

Also Read: In the Video: Possibilities of Ocean Floor Mapping

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)

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Skyscrapers May Have Made The Impact Of Hurricane Harvey Worse: Study

The scientists projected future warming and found future versions of the same storms would be significantly wetter and stronger.

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Hurricane
Floodwaters from Tropical Storm Harvey overflow from Buffalo Bayou in downtown Houston, Texas, VOA

Humans helped make recent devastating U.S. hurricanes wetter but in different ways, two new studies find.

Hurricane Harvey snagged on the skyscrapers of Houston, causing it to slow and dump more rain than it normally would, one study found. The city’s massive amounts of paving had an even bigger impact by reducing drainage. Land development in the metro area, on average, increased the chances of extreme flooding by 21 times, study authors said.

A second study looked at last year’s major Hurricanes Maria and Irma and 2005’s deadly Katrina and used computer simulations to see what would have happened if there had been no human-caused global warming. The study found that climate change significantly increased rainfall from those three storms, but did not boost their wind speed.

Both studies are in Wednesday’s journal Nature.

Hurricane, skyscraper
A smoky haze envelopes the skyscrapers and Rocky Mountains that usually can be seen as a backdrop to the city from a high-rise building, Aug. 20, 2018, in Denver. VOA

Houston was a literal drag on Harvey as it sloshed through, with the storm getting tripped up by the skyscrapers, said study co-author Gabriele Villarini, a civil and environmental engineering professor at the University of Iowa.

Co-author Gabe Vecchi, a climate scientist at Princeton University, said that forced the storm to move up higher, causing more concentrated rain over Houston and slowing, which also made more rain.

He compared it to a river running over rocks, creating bubbles.

“That’s sort of what’s going on here,” he said.

This effect is dwarfed, though, by the paving and building that don’t allow water to sink into the ground, Vecchi said.

Harvey’s record rainfall reached 5 feet in one spot near Houston. The scientists used computer simulations to see the effects of urbanization. In parts of the Houston metro area, the effects of development ranged from a 10 percent higher risk of extreme flooding in the less developed northwest to nearly 92 times the risk in the northeast, they reported.

Hurricane Florence, Lawmakers,
A work truck drives on Hwy 24 as the wind from Hurricane Florence blows palm trees in Swansboro N.C. VOA

That’s on top of the unique weather patterns that made Harvey slow down and stall and climate change which brought more water into the storm, Vecchi said.

MIT hurricane and climate expert Kerry Emanuel, who wasn’t part of the study, called the Harvey study “a real advance in our understanding of hurricane impacts on urban areas.”

But Texas state climatologist John Nielsen-Gammon wasn’t convinced. He said the team used generic shapes instead of the actual Houston skyline. He said the storm’s wind speeds may have slowed, but that’s different from the storm’s forward movement slowing.

The other study in Nature looked at a variety of historical damaging storms and tried to calculate past and future effects of climate change. In three cases, the scientists simulated the storms without the changes in the climate from greenhouse gases, showing that global warming increased rainfall 8.9 percent in Hurricane Maria , 6.3 percent in Hurricane Irma and 8.7 percent in Hurricane Katrina .

Maria hit Puerto and Rico and other parts of the Caribbean. Irma hit the Caribbean and Florida, while Katrina struck New Orleans and the Gulf Coast.

Climate Change, Hurricanes
Russ Lewis covers his eyes from a gust of wind and a blast of sand as Hurricane Florence approaches Myrtle Beach, S.C.. VOA

In Maria’s case, a warming climate concentrated heavier rain in the center of the storm and reduced it on the edges, said co-author Michael Wehner, a climate scientist at the Lawrence Berkeley National Laboratory.

For 15 storms, which included the devastating Typhoon Haiyan , the potent Gilbert and 1992’s Hurricane Andrew , the scientists projected future warming and found future versions of the same storms would be significantly wetter and stronger.

Also Read: Vietnam Does Its Part in Cleaning The Environment, Cleans Plastic

“We are beginning to see a climate change influence emerge on tropical cyclones and that’s coming out as rainfall,” said study lead author Christina Patricola, an atmospheric scientist at the national lab.

Although replicating a storm in a different climate is difficult and can’t account for certain changes, this work bolsters science understanding of how climate change alters hurricanes, Emanuel said. (VOA)