Navigation Links
A new global warming culprit: Dam drawdowns
Date:8/7/2012

VANCOUVER, Wash. Washington State University researchers have documented an underappreciated suite of players in global warming: dams, the water reservoirs behind them, and surges of greenhouse gases as water levels go up and down.

Bridget Deemer, a doctoral student at Washington State University-Vancouver, measured dissolved gases in the water column of Lacamas Lake in Clark County and found methane emissions jumped 20-fold when the water level was drawn down. A fellow WSU-Vancouver student, Maria Glavin, sampled bubbles rising from the lake mud and measured a 36-fold increase in methane during a drawdown.

Methane is 25 times more effective than carbon dioxide at trapping heat in the atmosphere. And while dams and the water behind them cover only a small portion of the earth's surface, they harbor biological activity that can produce large amounts of greenhouse gases. There are also some 80,000 dams in the United States alone, according to the U.S. Army Corps of Engineers National Inventory of Dams.

"Reservoirs have typically been looked at as a green energy source," says Deemer. "But their role in greenhouse gas emissions has been overlooked."

Deemer and Glavin's findings will be on display this week in a poster session at the national meeting of the Ecological Society of America in Portland.

Their efforts are part of a larger attempt to appreciate the role of lakes, reservoirs and streams in releasing greenhouse gases. A study published last year in the journal Science conservatively estimated that the ability of terrestrial ecosystems to act as carbon sinks, storing greenhouse gases, could be one-fourth less than estimated once emissions from reservoirs are considered.

The WSU-Vancouver work is the first to actually demonstrate and quantify the relationship between water-level drawdowns and greenhouse gas releases, says John Harrison, Deemer and Glavin's advisor and an assistant professor of Earth and Environmental Sciences.

The research could lead to different ways of managing drawdowns, he says, as emissions may be higher in summer months, when warmer temperatures and low oxygen conditions in bottom waters stimulate the microbial activity that produces greenhouse gases.

"We have the ability to manage the timing, magnitude and speed of reservoir drawdowns, which all could play a role in how much methane gets released to the atmosphere," Harrison says.

Managers can also consider the optimal time to take out a dam, Deemer says. While a dam removal may lead to some greenhouse gas emissions initially, she says it will be a one-time occurrence, while emissions can recur with regular drawdowns. The ability of soils and plants to store greenhouse gases could also make reservoir decommissioning a net sink, she says, but researchers "simply don't know at this point."

With Army Corps of Engineers funding, Deemer now plans to look at three other reservoirs in Oregon and northern California's Klamath basin.


'/>"/>

Contact: Eric Sorensen
eric.sorensen@wsu.edu
206-799-9186
Washington State University
Source:Eurekalert

Related biology news :

1. MSU to lead new global food security effort
2. Research links extreme summer heat events to global warming
3. Global CO2 emissions continue to increase
4. Stanford researchers calculate global health impacts of the Fukushima nuclear disaster
5. Global warming harms lakes
6. How to make global fisheries worth 5 times more: UBC research
7. ASU ecologist receives prestigious global award for water research
8. NOAA plankton surveys, second longest in the North Atlantic, add to new global effort
9. No matter the drilling method, natural gas is a much-needed tool to battle global warming
10. Building global collaboration for biodiversity intelligence
11. Revealing climate change website wins global award
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/13/2017)... 2017 According to a new market research report ... Identity Administration, and Authorization), Service, Authentication Type, Deployment Mode, Vertical, and Region ... expected to grow from USD 14.30 Billion in 2017 to USD 31.75 ... ... MarketsandMarkets Logo ...
(Date:4/11/2017)... No two people are believed to ... York University Tandon School of Engineering and Michigan ... partial similarities between prints are common enough that ... and other electronic devices can be more vulnerable ... in the fact that fingerprint-based authentication systems feature ...
(Date:4/5/2017)... Allen Institute for Cell Science today announces the launch ... dynamic digital window into the human cell. The website ... deep learning to create predictive models of cell organization, ... suite of powerful tools. The Allen Cell Explorer will ... resources created and shared by the Allen Institute for ...
Breaking Biology News(10 mins):
(Date:8/15/2017)... Linda, Ca (PRWEB) , ... August 15, 2017 ... ... coffee production and is threatened by various biotic and abiotic factors. During this ... complex evolutionary history of coffee, as well as gain a better understanding of ...
(Date:8/14/2017)... ... ... The Conference Forum has confirmed the one-day agenda for the ... 2017 at the Marriott Copley Place in Boston, MA. , Returning as program chair ... Pfizer Innovative Research Lab, Pfizer, who leads 19 industry speakers in discussing how and ...
(Date:8/11/2017)... (PRWEB) , ... August 11, 2017 , ... ... food production, and, in particular, more natural alternatives to synthetic ingredients,” said Matt ... of Third Wave, with the established manufacturing presence and know-how of Biorigin will ...
(Date:8/10/2017)... ... August 09, 2017 , ... Each year in the United States more than ... live an independent lifestyle and, even worse, the one-year mortality rate is high, ranging ... the University of California Davis Medical Center (Sacramento) and Second Xiangya Hospital of the ...
Breaking Biology Technology: