Navigation Links
Permafrost thaw: No upside
Date:3/21/2014

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. 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."


'/>"/>

Contact: Eunice Youmans
eyoumans@whrc.org
508-444-1509
Woods Hole Research Center
Source:Eurekalert  

Related biology news :

1. UF researchers experiment is first to simulate warming of Arctic permafrost
2. New knowledge about permafrost improving climate models
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Permafrost thaw: No upside
(Date:3/11/2016)... HANOVER, Germany , March 11, 2016 ... - Cross reference: Picture is available at AP Images ( ... scanner from DERMALOG will be used to produce the new refugee ... of other biometric innovations, at CeBIT in Hanover ... LF10 scanner from DERMALOG will be used to produce the new ...
(Date:3/10/2016)... , March 10, 2016 ... new market research report "Identity and Access Management Market ... Audit, Compliance, and Governance), by Organization Size, by Deployment, ... 2020", published by MarketsandMarkets, The market is estimated to ... 12.78 Billion by 2020, at a Compound Annual Growth ...
(Date:3/9/2016)... YORK , March 9, 2016 This ... and future states of the RNA Sequencing (RNA Seq) ... segments such as instruments, tools and reagents, data analysis, ... Analyze various segments of the RNA-Sequencing market such as ... services Identify the main factors affecting each segment and ...
Breaking Biology News(10 mins):
(Date:5/19/2016)... ... May 19, 2016 , ... KCAS Bioanalytical ... Abu Siddiqui as Director, Large Molecule & Biomarker Bioanalysis. , Dr. Siddiqui has ... biomarker discovery studies for preclinical and clinical safety programs. “We’ve seen significant demand ...
(Date:5/19/2016)... , May 19, 2016 - ... sessione orale durante il 52 ° ... 8006)    - Le conclusioni dello studio ... i pazienti trattati, di cui il 90% presenta una d ... mesi o più. Il settantadue per cento dei pazienti ha ...
(Date:5/18/2016)... ... May 18, 2016 , ... Shimadzu Scientific Instruments announces ... of Toledo. This two-day camp will take place annually starting June 2016. It ... pharmaceutical sciences in preparation for a university academic program. , The laboratory- ...
(Date:5/18/2016)... ... ... STACS DNA Inc., the sample tracking software company, today announced that STACS-CW Enterprise ... help them save time and reduce errors. , Sexual Assault kits are receiving an ... informed of results. Due to a previous lack of tools, many forensic DNA laboratories ...
Breaking Biology Technology: