Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

In measuring gas exchange between water and air, size matters

09.05.2017

Size of ponds and lakes affects gas exchange rates -- which may have implications for global climate change

Ponds and lakes play a significant role in the global carbon cycle, and are often net emitters of carbon gases to the atmosphere. However, the rate at which gases move across the air-water boundary is not well quantified, particularly for small ponds.


One of the Connecticut ponds studied by researchers. In the foreground are the jugs they used to disperse propane in the ponds during the experiments.

Credit: Meredith Holgerson

A new Yale-led study evaluated how the size of ponds and lakes affects gas exchange rates, which may have implications for carbon emissions and global climate change.

The study, appearing in the Journal of Geophysical Research -- Biogeosciences, suggests that the size of water bodies can affect the rate at which greenhouse gases, such as carbon dioxide and methane, move from ponds and lakes into the atmosphere.

Although gas exchange in larger lakes can be predicted by wind speed, this relationship breaks down under low-wind conditions, such as in small ponds, said Meredith Holgerson, the lead author of the study, who conducted the research while completing her Ph.D. at the Yale School of Forestry & Environmental Studies (F&ES).

"We found that we can't easily predict gas exchange rates in small ponds, and that variability in gas exchange increases with lake size," said Holgerson, who is now a research fellow at Portland State University. "This is important because gas exchange variability is not well accounted for in global models of greenhouse gas emissions from inland waters, but needs to be."

Researchers measured the rate of gas exchange between water bodies and the atmosphere -- also known as gas transfer velocity -- at four small ponds in the Yale-Myers Forest in northeastern Connecticut. They then compared gas exchange rates from 67 ponds and lakes around the world and found that both gas exchange rate and variability increased with lake size.

Their results indicate that exchange rates are variable within and among different sized ponds and were not well predicted from environmental variables such as wind, rainfall, and temperature. Scientists say that quantifying the gas exchange rates of ponds and lakes is critical for better estimating greenhouse gas emissions from inland water bodies.

###

The research team also included Peter Raymond, professor of ecosystem ecology at F&ES, and Emily Farr, a master's student at Yale.

Media Contact

Timothy Brown
timothy.brown@yale.edu
203-436-9503

 @YaleFES

http://environment.yale.edu/ 

Timothy Brown | EurekAlert!

More articles from Earth Sciences:

nachricht Filling the gap: High-latitude volcanic eruptions also have global impact
20.11.2017 | Institute of Atmospheric Physics, Chinese Academy of Sciences

nachricht Antarctic landscape insights keep ice loss forecasts on the radar
20.11.2017 | University of Edinburgh

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Nanoparticles help with malaria diagnosis – new rapid test in development

The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.

Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Previous evidence of water on mars now identified as grainflows

21.11.2017 | Physics and Astronomy

NASA's James Webb Space Telescope completes final cryogenic testing

21.11.2017 | Physics and Astronomy

New catalyst controls activation of a carbon-hydrogen bond

21.11.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>