Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Subarctic lakes are drying up at a rate not seen in 200 years

28.11.2013
The decrease in snowfall observed in recent years in Canada's subarctic regions has led to worrisome desiccation of the regions' lakes.

This is the conclusion arrived at by researchers from Université Laval, Wilfrid Laurier University, Brock University and the University of Waterloo in a study published this week on the website of the scientific journal Geophysical Research Letters.


Desiccated lakes in Wapusk National Park near Churchill, Manitoba (Canada) are shown. Desiccation of shallow lakes has occurred recently in response to lower-than-average snowmelt runoff. This phenomenon appears unprecedented over the last 200 years.

Credit: Hilary White

Researchers came to this conclusion after studying 70 lakes near Old Crow, Yukon, and Churchill, Manitoba. Most of the lakes studied are less than one metre deep. According to the analysis, more than half of those located on relatively flat terrain and surrounded by scrubby vegetation show signs of desiccation.

The problem stems chiefly from a decline in meltwater; for instance, from 2010 to 2012 average winter precipitation in Churchill decreased by 76 mm compared to the averages recorded from 1971 to 2000.

The drying of some lakes, which first became visible to the naked eye in 2010, was even more pronounced in summer 2013. "With this type of lake, precipitation in the form of snow represents 30% to 50% of the annual water supply," explained the study's lead author, Frédéric Bouchard, a postdoctoral fellow at Université Laval's Department of Geography and the Centre for Northern Studies.

The kind of desiccation seen by the researchers is without precedent in 200 years. Isotopic analyses conducted on the remains of phytoplankton accumulated in lakebed sediment show that the lakes have maintained water balance for 200 years. This stability was abruptly disrupted a few years ago.

If the trend of dry summers and less snowy winters continues, as climate models forecast, many of the subarctic's shallowest lakes could dry out completely. "It's difficult to predict all the repercussions of this habitat loss," admits Bouchard, "but it's certain that the ecological consequences will be significant."

In addition to Frédéric Bouchard, the study's coauthors are R. Pienitz (Université Laval); K. W. Turner (Brock University); C. Deakin, H. White, N. Farquharson, A. S. Medeiros, B. B. Wolfe (Wilfrid Laurier University); and L. A. MacDonald, R. I. Hall, T. W. D. Edwards (University of Waterloo).

Aerial photos of lakes in the process of drying up are available upon request.

Information:

Frédéric Bouchard
Centre for Northern Studies
Université Laval
418-524-1955
Frederic.Bouchard@cen.ulaval.ca

Jean-François Huppé | EurekAlert!
Further information:
http://www.ulaval.ca

Further reports about: Geophysical Research Northern Lights Phytoplankton Subarctic meltwater

More articles from Earth Sciences:

nachricht New Study Will Help Find the Best Locations for Thermal Power Stations in Iceland
19.01.2017 | University of Gothenburg

nachricht Water - as the underlying driver of the Earth’s carbon cycle
17.01.2017 | Max-Planck-Institut für Biogeochemie

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>