Featured Research

from universities, journals, and other organizations

Ozone thinning has changed ocean circulation

Date:
January 31, 2013
Source:
Johns Hopkins
Summary:
A hole in the Antarctic ozone layer has changed the way that waters in the southern oceans mix, a situation that has the potential to alter the amount of carbon dioxide in the atmosphere and eventually could have an impact on global climate change.

Antarctica. A hole in the Antarctic ozone layer has changed the way that waters in the southern oceans mix, a situation that has the potential to alter the amount of CO2 in the atmosphere and eventually could have an impact on global climate change, a Johns Hopkins earth scientist says.
Credit: © Goinyk Volodymyr / Fotolia

A hole in the Antarctic ozone layer has changed the way that waters in the southern oceans mix, a situation that has the potential to alter the amount of CO2 in the atmosphere and eventually could have an impact on global climate change, a Johns Hopkins earth scientist says.

Related Articles


In a paper published in this week's issue of the journal Science, Darryn W. Waugh and his team show that subtropical intermediate waters in the southern oceans have become "younger" as the upwelling, circumpolar waters have gotten "older" -- changes that are consistent with the fact that surface winds have strengthened as the ozone layer has thinned.

"This may sound entirely academic, but believe me, it's not," said Waugh, of the Morton K. Blaustein Department of Earth and Planetary Sciences at Johns Hopkins' Krieger School of Arts and Sciences. "This matters because the southern oceans play an important role in the uptake of heat and carbon dioxide, so any changes in southern ocean circulation have the potential to change the global climate."

Waugh's team used measurements taken from the early 1990s to the mid-to-late 2000s of the amount of a chemical compound known as "chlorofluorocarbon-12," or CFC-12, in the southern oceans. CFC-12 was first produced commercially in the 1930s and its concentration in the atmosphere increased rapidly until the 1990s when it was phased out by the Montreal Protocol on substances that deplete the ozone layer. (Prior to the Montreal Protocol, CFC-12 was used in products such as aerosol hairsprays and refrigerants and in air conditioning systems.)

From those ocean measurements, Waugh's team was able to infer changes in how rapidly surface waters have mixed into the depths of the southern oceans. Because they knew that concentrations of CFCs at the ocean surface increased in tandem with those in the atmosphere, they were able to surmise that the higher the concentration of CFC-12 deeper in the ocean, the more recently those waters were at the surface.

The inferred age changes -- "younger" in the subtropics, "older" nearer the South Pole -- are consistent with the observed intensification of surface westerly winds, which have occurred primarily because of the Antarctic ozone hole, suggesting that stratospheric ozone depletion is the primary cause of the changes in ocean ventilation. As stratospheric ozone recovers over the next 50 years, the changes in ventilation may slow or reverse. The impact of continued increases in greenhouse gases in the atmosphere will also need to be considered, however. The combined impact of the two factors on the southern oceans' ventilation and uptake of heat and carbon is an open question.

Also on the research team were collaborators Francois Primeau of the University of California, Irvine; Tim Devries of the University of California, Los Angeles; and Mark Holzer of the University of New South Wales and Columbia University. Funding for the study was provided by the National Science Foundation and the Australian Research Council.


Story Source:

The above story is based on materials provided by Johns Hopkins. The original article was written by Lisa De Nike. Note: Materials may be edited for content and length.


Journal Reference:

  1. D. W. Waugh, F. Primeau, T. DeVries, M. Holzer. Recent Changes in the Ventilation of the Southern Oceans. Science, 2013; 339 (6119): 568 DOI: 10.1126/science.1225411

Cite This Page:

Johns Hopkins. "Ozone thinning has changed ocean circulation." ScienceDaily. ScienceDaily, 31 January 2013. <www.sciencedaily.com/releases/2013/01/130131144106.htm>.
Johns Hopkins. (2013, January 31). Ozone thinning has changed ocean circulation. ScienceDaily. Retrieved November 28, 2014 from www.sciencedaily.com/releases/2013/01/130131144106.htm
Johns Hopkins. "Ozone thinning has changed ocean circulation." ScienceDaily. www.sciencedaily.com/releases/2013/01/130131144106.htm (accessed November 28, 2014).

Share This


More From ScienceDaily



More Earth & Climate News

Friday, November 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Japan's Mt. Aso Volcano Spews Rocks

Raw: Japan's Mt. Aso Volcano Spews Rocks

AP (Nov. 28, 2014) — A volcano in southern Japan is spewing volcanic magma rocks. A regional weather observatory says this could be Mt. Aso's first magma eruption in 22 years. (Nov. 28) Video provided by AP
Powered by NewsLook.com
Scientists Find Invisible Space Shield Protecting Earth

Scientists Find Invisible Space Shield Protecting Earth

Newsy (Nov. 27, 2014) — An invisible barrier is keeping dangerous super fast electrons from interfering with our atmosphere, but scientists aren't entirely sure how. Video provided by Newsy
Powered by NewsLook.com
Bolivian Recycling Initiative Turns Plastic Waste Into School Furniture

Bolivian Recycling Initiative Turns Plastic Waste Into School Furniture

Reuters - Innovations Video Online (Nov. 26, 2014) — Innovative recycling project in La Paz separates city waste and converts plastic garbage into school furniture made from 'plastiwood'. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
Blu-Ray Discs Getting Second Run As Solar Panels

Blu-Ray Discs Getting Second Run As Solar Panels

Newsy (Nov. 26, 2014) — Researchers at Northwestern University are repurposing Blu-ray movies for better solar panel technology thanks to the discs' internal structures. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins