Aircraft reveal surprisingly strong Southern Ocean carbon sink

January 3, 2022

The Southern Ocean is a significant carbon sink -- absorbing a large amount of the excess carbon dioxide emitted into the atmosphere by human activities -- according to a new study led by scientists affiliated with the National Center for Atmospheric Research. 

The findings provide clarity about the role the icy waters surrounding Antarctica play in buffering the impact of increasing greenhouse gas emissions. Previous research published in recent years suggested the Southern Ocean might be less of a sink than previously thought.

The study, published in the journal Science, uses observations from research aircraft flown during three field projects over nearly a decade, as well as a collection of atmospheric models, to determine that the Southern Ocean takes up significantly more carbon than it releases. The research also highlights the power that airborne observations have in revealing patterns in the global carbon cycle.

"You can't fool the atmosphere," said NCAR scientist Matthew Long, the paper's lead author. "While measurements taken from the ocean surface and from land are important, they are too sparse to provide a reliable picture of air-sea carbon flux. The atmosphere, however, can integrate fluxes over large expanses. Airborne measurements show a drawdown of CO2 in the lower atmosphere over the Southern Ocean surface in summer, indicating carbon uptake by the ocean."

The research is funded by the U.S. National Science Foundation, NCAR's sponsor, as well as by NASA and the National Oceanic and Atmospheric Association.

Once human-produced CO2 emissions from burning fossil fuels and other activities enter the atmosphere, some of the gas is taken up by plants and some is absorbed into the ocean. While the overall concentration of CO2 in the atmosphere continues to increase, causing the global temperature to rise, these land and ocean "sinks" slow the effect.

A more precise understanding of where carbon sinks exist, how big they are, and how they may be changing as society continues to emit more CO2 is crucial to projecting the future trajectory of climate change. It is also necessary for evaluating the impact of potential emission reduction measures and CO2 removal technologies.

The research team pieced together airborne measurements from three different field projects stretching over nearly a decade: the HIAPER Pole-to-Pole Observations, or HIPPO, project; the O2/N2 Ratio and CO2 Airborne Southern Ocean, or ORCAS, study; and the Atmospheric Tomography, or ATom, mission.

Data from the aircraft campaigns captured the vertical CO2 gradient. For example, during the ORCAS field campaign, scientists on board the NSF/NCAR HIAPER Gulfstream V research aircraft could see a decrease in CO2 concentrations on their instruments as the plane descended.

"Aircraft campaigns that make atmospheric measurements over the oceans are critical for better quantifying the ocean-atmosphere exchange of carbon," said Sylvia Edgerton, a program director in NSF's Division of Atmospheric and Geospace Sciences.

About the field campaigns

HIPPO: Funded by NSF and NOAA.

ORCAS: Funded by NSF.

ATom: Funded and supported by NASA, with funding for additional CO2 measurements from NSF.

--  NSF Public Affairs, Researchnews@nsf.gov

https://www.nsf.gov/discoveries/disc_summ.jsp?WT.mc_id=USNSF_1&...

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Maine Center For Public Interest Reporting – Three Part Series: A CRITICAL LOOK AT MAINE’S WIND ACT

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(excerpts) From Part 1 – On Maine’s Wind Law “Once the committee passed the wind energy bill on to the full House and Senate, lawmakers there didn’t even debate it. They passed it unanimously and with no discussion. House Majority Leader Hannah Pingree, a Democrat from North Haven, says legislators probably didn’t know how many turbines would be constructed in Maine if the law’s goals were met." . – Maine Center for Public Interest Reporting, August 2010 https://www.pinetreewatchdog.org/wind-power-bandwagon-hits-bumps-in-the-road-3/From Part 2 – On Wind and Oil Yet using wind energy doesn’t lower dependence on imported foreign oil. That’s because the majority of imported oil in Maine is used for heating and transportation. And switching our dependence from foreign oil to Maine-produced electricity isn’t likely to happen very soon, says Bartlett. “Right now, people can’t switch to electric cars and heating – if they did, we’d be in trouble.” So was one of the fundamental premises of the task force false, or at least misleading?" https://www.pinetreewatchdog.org/wind-swept-task-force-set-the-rules/From Part 3 – On Wind-Required New Transmission Lines Finally, the building of enormous, high-voltage transmission lines that the regional electricity system operator says are required to move substantial amounts of wind power to markets south of Maine was never even discussed by the task force – an omission that Mills said will come to haunt the state.“If you try to put 2,500 or 3,000 megawatts in northern or eastern Maine – oh, my god, try to build the transmission!” said Mills. “It’s not just the towers, it’s the lines – that’s when I begin to think that the goal is a little farfetched.” https://www.pinetreewatchdog.org/flaws-in-bill-like-skating-with-dull-skates/

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Hannah Pingree on the Maine expedited wind law

Hannah Pingree - Director of Maine's Office of Innovation and the Future

"Once the committee passed the wind energy bill on to the full House and Senate, lawmakers there didn’t even debate it. They passed it unanimously and with no discussion. House Majority Leader Hannah Pingree, a Democrat from North Haven, says legislators probably didn’t know how many turbines would be constructed in Maine."

https://pinetreewatch.org/wind-power-bandwagon-hits-bumps-in-the-road-3/

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