Featured Research

from universities, journals, and other organizations

Climate Change Will Affect Carbon Sequestration In Oceans, Scientists Say

Date:
December 4, 2002
Source:
University Of Illinois At Urbana-Champaign
Summary:
The direct injection of unwanted carbon dioxide deep into the ocean is one suggested strategy to help control rising atmospheric carbon dioxide levels and mitigate the effects of global warming. But, like the problems associated with the long-term storage of nuclear waste, finding a safe place to sequester the carbon may be more difficult than scientists first anticipated.

CHAMPAIGN, Ill. -- The direct injection of unwanted carbon dioxide deep into the ocean is one suggested strategy to help control rising atmospheric carbon dioxide levels and mitigate the effects of global warming. But, like the problems associated with the long-term storage of nuclear waste, finding a safe place to sequester the carbon may be more difficult than scientists first anticipated.

Related Articles


Because the atmosphere interacts with the oceans, the net uptake of carbon dioxide and the oceans' sequestration capacity would be affected by a change in climate. Just how effective carbon sequestration would be, in light of projected climate change, has not been studied before. Indeed, estimating the impact of carbon injection is complicated because of a limited understanding of climate and oceanic carbon cycle feedback mechanisms.

"Through various feedback mechanisms, the ocean circulation could change and affect the retention time of carbon dioxide injected into the deep ocean, thereby indirectly altering oceanic carbon storage and atmospheric carbon dioxide concentration," said Atul Jain, a professor of atmospheric sciences at the University of Illinois at Urbana-Champaign. "Where you inject the carbon dioxide turns out to be a very important issue."

To investigate the possible effects of feedbacks between global climate change, the ocean carbon cycle and oceanic carbon sequestration, Jain and graduate student Long Cao developed an atmosphere-ocean, climate-carbon cycle model of intermediate complexity. The researchers then used the model to study the effectiveness of oceanic carbon sequestration by the direct injection of carbon dioxide at different locations and ocean depths.

Jain and Cao found that climate change has a big impact on the oceans' ability to store carbon dioxide. The effect was most pronounced in the Atlantic Ocean.

"When we ran the model without the climate feedback mechanisms, the Pacific Ocean held more carbon dioxide for a longer period of time," Cao said. "But when we added the feedback mechanisms, the retention time in the Atlantic Ocean proved far superior. Based on our initial results, injecting carbon dioxide into the Atlantic Ocean would be more effective than injecting it at the same depth in either the Pacific Ocean or the Indian Ocean."

Future climate change could affect both the uptake of carbon dioxide in the ocean basins and the ocean circulation patterns themselves, Jain said. "As sea-surface temperatures increase, the density of the water decreases and thus slows down the ocean thermohaline circulation, so the ocean's ability to absorb carbon dioxide also decreases. This leaves more carbon dioxide in the atmosphere, exacerbating the problem. At the same time, the reduced ocean circulation will decrease the ocean mixing, which decreases the ventilation to the atmosphere of carbon injected into the deep ocean. Our model results show that this effect is more dominating in the Atlantic Ocean."

Tucking away excess carbon dioxide in Davy Jones's locker is not a permanent solution for reducing the amount of carbon dioxide in the atmosphere. "Sequestering carbon in the deep ocean is, at best, a technique to buy time," Jain said.

"Carbon dioxide dumped in the oceans won't stay there forever. Eventually it will percolate to the surface and into the atmosphere."

To buy as much time as possible, the carbon dioxide must remain trapped for as long as possible. "The big question is in what region of which ocean will future climate change have the least effect," Jain said. "That's where we will want to store the carbon dioxide."

Jain and Cao will present their latest findings at the American Geophysical Union meeting in San Francisco, Dec. 6-10. The U.S. Department of Energy funded the work.


Story Source:

The above story is based on materials provided by University Of Illinois At Urbana-Champaign. Note: Materials may be edited for content and length.


Cite This Page:

University Of Illinois At Urbana-Champaign. "Climate Change Will Affect Carbon Sequestration In Oceans, Scientists Say." ScienceDaily. ScienceDaily, 4 December 2002. <www.sciencedaily.com/releases/2002/12/021204080934.htm>.
University Of Illinois At Urbana-Champaign. (2002, December 4). Climate Change Will Affect Carbon Sequestration In Oceans, Scientists Say. ScienceDaily. Retrieved January 26, 2015 from www.sciencedaily.com/releases/2002/12/021204080934.htm
University Of Illinois At Urbana-Champaign. "Climate Change Will Affect Carbon Sequestration In Oceans, Scientists Say." ScienceDaily. www.sciencedaily.com/releases/2002/12/021204080934.htm (accessed January 26, 2015).

Share This


More From ScienceDaily



More Earth & Climate News

Monday, January 26, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Florida Might Legalize Black Bear Hunting

Florida Might Legalize Black Bear Hunting

Newsy (Jan. 24, 2015) A string of black bear attacks has Florida officials considering lifting the ban on hunting the animals to control their population. Video provided by Newsy
Powered by NewsLook.com
Dramatic Footage Shows Coast Guard Rescue Off Scottish Coast

Dramatic Footage Shows Coast Guard Rescue Off Scottish Coast

Reuters - News Video Online (Jan. 23, 2015) Footage just released by the UK Coast Guard shows a dramatic helicopter rescue off the Scottish coast, where five men were plucked to safety after their fishing boat sank on Saturday. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Stunning Wingsuit Proximity Flying in Norway

Stunning Wingsuit Proximity Flying in Norway

Rumble (Jan. 23, 2015) A collection of amazing shots from flights made in the Aurland Valley in Norway. How incredible is that? Credit to &apos;BASEjumper&apos;. Video provided by Rumble
Powered by NewsLook.com
Senate Agrees Climate Change Is Happening, Just Not On Why

Senate Agrees Climate Change Is Happening, Just Not On Why

Newsy (Jan. 22, 2015) The Senate voted to confirm climate change is real, but some still weren&apos;t on board with the idea that humans are causing it. 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