Take the pledge to vote

For a better tommorow#AajSawaroApnaKal
  • I agree to receive emails from News18

  • I promise to vote in this year's elections no matter what the odds are.
  • Please check above checkbox.

    SUBMIT

Thank you for
taking the pledge

Vote responsibly as each vote counts
and makes a diffrence

Disclaimer:

Issued in public interest by HDFC Life. HDFC Life Insurance Company Limited (Formerly HDFC Standard Life Insurance Company Limited) (“HDFC Life”). CIN: L65110MH2000PLC128245, IRDAI Reg. No. 101 . The name/letters "HDFC" in the name/logo of the company belongs to Housing Development Finance Corporation Limited ("HDFC Limited") and is used by HDFC Life under an agreement entered into with HDFC Limited. ARN EU/04/19/13618
LIVE TV DownloadNews18 App
News18 English
News18 » Buzz
2-min read

Increased Oxygen Depletion at Bottom of Lakes Causing Greenhouse Gas Effect, Says Study

A study led by the University of Basel and the Université de Montréal examined the direct and indirect effects of climate warming.

Trending Desk

Updated:September 12, 2019, 10:39 AM IST
facebookTwitterskypewhatsapp
Increased Oxygen Depletion at Bottom of Lakes Causing Greenhouse Gas Effect, Says Study
The lake would be the world's highest lake if its altitude of 5000-plus metres is officially verified. (Photo: Facebook)
Loading...

Researchers have attributed an unexpected greenhouse gas effect in lakes to increased oxygen depletion at the bottom of the water bodies.

A study led by the University of Basel and the Université de Montréal examined the direct and indirect effects of climate warming. The results have been published in the journal Limnology and Oceanography Letters.

The researchers said the main focus of their investigations was the water temperature and greenhouse gas production in the deeper parts of the lakes, which play an important role in the global carbon cycle by acting as large natural bioreactors.

The temperature of a lake represents an important constraint on the amount of carbon dioxide and methane it emits into the atmosphere.

Previously it was assumed that global warming stimulates microbial respiratory processes and the production of these greenhouse gases, while at the same time reducing the carbon storage in lake sediments. But the new research has examined these interactions more closely and discovered unexpected effects, according to a University of Basel release.

"We don't want to question the fundamentals of thermodynamics. There is no doubt that the rates of respiratory metabolic processes in lakes are generally higher at increased water temperatures," said Professor Moritz Lehmann from the Department of Environmental Sciences at the University of Basel. "However, climate change will not cause every lake to warm up everywhere."

Lakes worldwide are not only warming at the surface but they are also losing transparency due to increased algae production and enhanced turbidity of the lake water.

"The surface-water warming and the loss of transparency have the effect that more heat is trapped in the upper layers of the lakes, leaving the deeper waters thermally isolated," said lead author of the study, Dr. Maciej Bartosiewicz from the Department of Environmental Sciences at the University of Basel. "Under some circumstances, this can even lead to the cooling of water masses near the bottom of the lake."

This slows down the respiratory decay processes and carbon dioxide production in the lakes, increasing carbon burial within the sediments.

Model simulations suggest that the observed effects are most pertinent to relatively small and shallow lakes, which make up approximately half of the global lake surface.

"All in all, global warming increases the greenhouse gas potential of lakes, as expected. However, this has less to do with the warming directly, and more to do with increased oxygen depletion at the bottom of these lakes," Bartosiewicz said.

Get the best of News18 delivered to your inbox - subscribe to News18 Daybreak. Follow News18.com on Twitter, Instagram, Facebook, Telegram, TikTok and on YouTube, and stay in the know with what's happening in the world around you – in real time.

Read full article
Loading...
Next Story
Next Story

Also Watch

facebookTwitterskypewhatsapp

Live TV

Countdown To Elections Results
To Assembly Elections 2018 Results