Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Permafrost Thaw Exacerbates Climate Change

24.03.2014

The climate is warming in the arctic at twice the rate of the rest of the globe creating a longer growing season and increased plant growth, which captures atmospheric carbon, and thawing permafrost, which releases carbon into the atmosphere.


Summer warming experiment


Winter warming experiment

Woods Hole Research Center (WHRC) Assistant Scientist Sue Natali and colleagues engineered first-of-a-kind warming experiments in the field to determine net gains or losses in carbon emissions. The study entitled “Permafrost degradation stimulates carbon loss from experimentally warmed tundra,” published in the journal Ecology found that growing season gains do not offset carbon emissions from permafrost thaw.

According to Dr. Natali, “Our results show that while permafrost degradation increased carbon uptake during the growing season, in line with decadal trends of ‘greening’ tundra, warming and permafrost thaw also enhanced winter respiration, which doubled annual carbon losses.”

Permafrost contains three to seven times the amount of carbon sequestered in tropical forests. The warming climate threatens to thaw permafrost, which will result in the release of carbon dioxide and methane into the atmosphere creating feedbacks to climate change – more warming and greater permafrost thaw. Prior to this study, “the understanding of permafrost feedbacks to climate change had been limited by a lack of data examining warming effects on both vegetation and permafrost carbon simultaneously,” said Dr. Natali.

This study measured CO2 emissions from permafrost thaw and its impact on the carbon balance on an ecosystem level. According to Dr. Natali, “There is 100 times more carbon stored belowground than aboveground in the arctic, so observed changes in plant productivity are only a very small component of the story. Given the amount of carbon stored belowground in the arctic, it is very unlikely that plant growth can ever fully offset C losses from permafrost thaw.”

The three year long Carbon in Permafrost Experimental Heating Research (CiPEHR) project warmed air and soil and thawed permafrost using two warming experiments. The “winter warming” treatment consisted of snow packs, which functioned like down comforters insulating the ground during the winter until the snow was removed at the start of the growing season. The “summer warming” treatment consisted of open-topped greenhouses that warmed the air during the summer. The team measured warming effects on CO2 uptake by plants and release by plants and microbes.

Scientists estimate that within the next century permafrost will have declined 30% to 70% and there is limited accounting of how much carbon is stored in these frozen soils or the rate at which it will be released. For Dr. Natali:

“The only way we can accurately project future climate is to understand the responses of both plants and microbes to a warming climate. This study was the first to simulate whole ecosystem warming in the arctic, including permafrost degradation, similar to what is projected to happen as a result of climate change. There is a strong potential for significant global carbon emissions if rates calculated here become typical for permafrost ecosystems in a warmer world.”

Link to abstract »

WHRC is an independent research institute where scientists collaborate to examine the drivers and impacts of climate change and identify opportunities for conservation around the globe.

Contact: Eunice Youmans, Director of External Affairs 508-444-1509
Email Eunice Youmans

Eunice Youmans | EurekAlert!
Further information:
http://whrc.org/news/pressroom/PR-2014-Natali-Permafrost-Ecology.html

Further reports about: CO2 Change Climate Ecology Permafrost carbon degradation ecosystem microbes permafrost warming

More articles from Earth Sciences:

nachricht Experts defend operational earthquake forecasting, counter critiques
02.09.2014 | Seismological Society of America

nachricht Likely near-simultaneous earthquakes complicate seismic hazard planning for Italy
02.09.2014 | Seismological Society of America

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Anzeige

Anzeige

Event News

IT security in the digital society

27.08.2014 | Event News

Understanding the brain—neuroscientists meet in Göttingen

27.08.2014 | Event News

MEDICA EDUCATION CONFERENCE: Bessere Behandlung dank Biomarker

21.08.2014 | Event News

 
Latest News

A smart fluorescent antenna for Wi-Fi applications

02.09.2014 | Power and Electrical Engineering

Blowfly maggots provide physical evidence for forensic cases

02.09.2014 | Life Sciences

Single laser stops molecular tumbling motion instantly

02.09.2014 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>