Featured Research

from universities, journals, and other organizations

Carbon sink at South Pole has grown recently, historical collections reveal

Date:
February 22, 2011
Source:
Cell Press
Summary:
By studying collections of a marine bryozoan that date back to a famous 1901 expedition to the South Pole, researchers have found that those organisms were growing steadily up until 1990, when their growth more than doubled. The data provide the highest-latitude record of a century of growth and some of the first evidence that polar carbon sinks may be increasing.

Image depicting the heating and cooling trends over and around Antarctica. Blue indicates cooling trends and red indicates warming trends (image created in 2005). New research shows that polar carbon sinks may be increasing.
Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio. Data provided by Larry Stock

By studying collections of a marine bryozoan that date back to a famous 1901 expedition to the South Pole, researchers have found that those organisms were growing steadily up until 1990, when their growth more than doubled.

Related Articles


The data, reported in the February 22 issue of Current Biology, provide the highest-latitude record of a century of growth and some of the first evidence that polar carbon sinks may be increasing.

The bryozoan in question, known as Cellarinella nutti, is a filter-feeding invertebrate that looks like branching twigs. C. nutti is found in abundance in the Antarctic and is ideal for such studies because it preserves a clear macroscopic environmental record in its skeleton, recorded as tree-ring-like growth-check lines.

"This is one of the few pieces of evidence that life in Antarctica has recently changed drastically," said David Barnes of the British Antarctic Survey. "These animals are taking more carbon dioxide out of circulation and locking it away on the seabed."

The more rapid growth of C. nutti reflects a coincident increase in the regional production of the phytoplankton that the bryozoan eats. Those algae rely on carbon dioxide dissolved into the seawater for their sustenance. The carbon in the algae is taken up by C. nutti, where it is incorporated into their skeleton and other tissues. As the animals grow, portions of it break off and are buried in the seabed. "Thus, the amount of carbon being buried on the seabed is increasing -- whilst globally we are becoming more aware of the need to reduce carbon dioxide in the atmosphere," Barnes said.

He says the shift is most likely the result of ozone losses, which have led to an increase in wind speeds over the last decade. Those stronger winds are a boon to plankton, as they blow ice out of the way and drive greater circulation of surface waters.

"If we are right, this is a rare example of animals responding to one global phenomenon, the ozone hole, and affecting another, the greenhouse effect," Barnes said.

The discovery would not have been possible without early marine collections assembled by the explorer Captain Robert Falcon Scott, a polar pioneer who led the British National Antarctic Expedition and British Antarctic Expeditions at the turn of the 20th century, along with specimens maintained by museums in the United Kingdom, United States, and New Zealand.

"Scott's most famous journey was to reach the South Pole, but a team lead by the Norwegian explorer [Roald] Amundsen beat them to it," Barnes said. "Scott's team died in 1912 on the journey back to his food depots, and so his exploits are often not associated with success. What is not so well known is that his voyages were first and foremost scientific ones, and the collections of material and information they made were impressive even by today's standards."

The findings highlight the challenges of understanding the effects of large-scale processes such as the ozone hole or climate change. "This is not just because it is patchy in space and time, but also because of interactions between effects, as we found," Barnes said.

It is not yet clear how big an impact the changes in C. nutti might have, and at the moment, Barnes suspects it is likely to be quite small.

"Nevertheless, we think that the combination of ice shelf losses and sea ice losses due to climate change and the effect of ozone loss-induced wind speeds offer some hope for much-needed carbon sequestration to the seabed in the Southern Ocean," Barnes said. "There are few other places in the world where global and regional changes could actually lead to more carbon being removed from the system."


Story Source:

The above story is based on materials provided by Cell Press. Note: Materials may be edited for content and length.


Cite This Page:

Cell Press. "Carbon sink at South Pole has grown recently, historical collections reveal." ScienceDaily. ScienceDaily, 22 February 2011. <www.sciencedaily.com/releases/2011/02/110221120945.htm>.
Cell Press. (2011, February 22). Carbon sink at South Pole has grown recently, historical collections reveal. ScienceDaily. Retrieved January 29, 2015 from www.sciencedaily.com/releases/2011/02/110221120945.htm
Cell Press. "Carbon sink at South Pole has grown recently, historical collections reveal." ScienceDaily. www.sciencedaily.com/releases/2011/02/110221120945.htm (accessed January 29, 2015).

Share This


More From ScienceDaily



More Earth & Climate News

Thursday, January 29, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Scientists Say Earliest Snakes Lived Alongside The Dinosaurs

Scientists Say Earliest Snakes Lived Alongside The Dinosaurs

Newsy (Jan. 28, 2015) Wrongly categorized as lizard fossils, snake fossils now show the reptile could have developed earlier than we thought — 70 million years earlier. Video provided by Newsy
Powered by NewsLook.com
Time Lapse: Sculptures Created from 30 Tons of Snow

Time Lapse: Sculptures Created from 30 Tons of Snow

Rumble (Jan. 28, 2015) Students in North Finland use 30 tons of snow and one ton of ice to build a massive photography display and sculpture installation. Five days of work condensed into a one-minute time lapse! Video provided by Rumble
Powered by NewsLook.com
Aquaponics Turn Suburban Industrial Park Into Farmland: Hume

Aquaponics Turn Suburban Industrial Park Into Farmland: Hume

The Toronto Star (Jan. 27, 2015) Ancient techniques of growing greens with fish and water are well ahead of Toronto bylaws. Video provided by The Toronto Star
Powered by NewsLook.com
Madagascar Locust Plague Could Mean Famine For Millions

Madagascar Locust Plague Could Mean Famine For Millions

Newsy (Jan. 27, 2015) The Food and Agriculture Organization says millions could face famine in Madagascar without more funding to finish locust eradication efforts. 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