Navigation Links
Warmer climate entails increased release of carbon dioxide by inland lakes

Much organically bound carbon is deposited on inland lake bottoms. A portion remains in the sediment, sometimes for thousands of years, while the rest is largely broken down to carbon dioxide and methane, which are released into the atmosphere. Swedish researchers have shown that carbon retention by sediment is highly temperature-sensitive and that a warmer climate would result in increased carbon dioxide emissions to the atmosphere. The study is published in the current issue of the journal Nature.

Particles of different kinds including microscopic algae, other plankton and humus from surrounding land areas are continuously deposited on lake bottoms. The breakdown of a portion of this matter by bacteria in the sediment contributes significantly to atmospheric carbon dioxide. Lake sediment nevertheless constitutes an important "carbon sink," serving to store sometimes for a very long time a significant portion of the carbon-containing material that does not decompose.

To date, it has been unclear to what extent organic, carbon-containing material remains on lake bottoms, as opposed to being broken down. A group of researchers under the leadership of Professor Lars Tranvik at the Department of Limnology at Uppsala University has found a strong connection between the carbon dioxide production of lake sediment and bottom-water temperature.

"What we have discovered is that a very similar temperature-dependence relationship holds for a wide range of lake-sediment types," says doctoral student Cristian Gudasz, who was responsible for data collection and evaluation. "Temperature affects carbon-dioxide production in much the same way regardless of a lake's nutrient content and geographic location and the chemical composition of the sediment."

The discovery of a broadly robust temperature-dependence relationship set the stage for an investigation of the effect of temperature on lake sediment in the boreal forest zone that runs through Eurasia and North America and contains millions of lakes. The annual rate at which bound carbon is deposited as sediment in the lakes of the boreal zone will fall by 4-27 per cent, depending on which climate forecasts are borne out, over the next hundred years. The production of carbon dioxide by lake sediment will increase correspondingly, resulting in higher levels of emissions to the atmosphere.

It is becoming increasingly clear that inland water systems play an important role in the global carbon cycle, in spite of the fact that they only cover 3 percent of the land area of the Earth. The study under consideration demonstrates how the role of inland water systems can be expected to change in response to climate change.


Contact: Christian Gudasz
Uppsala University

Related biology news :

1. Warmer climate makes Baltic more salty
2. Warmer summers could create challenges for nesting Arctic seabirds
3. Arctic could face warmer and ice-free conditions
4. Ethiopias climate 27 million years ago had higher rainfall, warmer soil
5. Warmer environment means shorter lives for cold-blooded animals
6. Warmer climate causing huge increase in tree mortality across the West
7. Purdue study suggests warmer temperatures could lead to a boom in corn pests
8. Getting warmer? Prehistoric climate can help forecast future changes
9. Smithsonian perspective: Biodiversity in a warmer world
10. Climate change causes larger, more plentiful marmots, study shows
11. 7 California universities/NOAA to study climate, marine ecosystems
Post Your Comments:
(Date:11/17/2015)... Paris from 17 th until 19 ... from 17 th until 19 th November 2015. ... invented the first combined scanner in the world which scans ... now two different scanners were required: one for passports and ... the same surface. This innovation is an ideal solution for ...
(Date:11/17/2015)... 2015 Pressure BioSciences, Inc. (OTCQB: PBIO) ("PBI" ... sale of broadly enabling, pressure cycling technology ("PCT")-based sample ... announced it has received gross proceeds of $745,000 from ... (the "Offering"), increasing the total amount raised to date ... closings are expected in the near future. ...
(Date:11/12/2015)... Mass. , Nov. 12, 2015  Arxspan ... Institute of MIT and Harvard for use of ... discovery information management tools. The partnership will support ... both biological and chemical research information internally and ... will be used for managing the Institute,s electronic ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... FAR HILLS, N.J. (PRWEB) , ... November 24, 2015 , ... ... University, as the recipient of the 2016 USGA Green Section Award. Presented annually since ... of golf through his or her work with turfgrass. , Clarke, of ...
(Date:11/24/2015)... (PRWEB) , ... November 24, 2015 , ... ... maintain healthy metabolism. But unless it is bound to proteins, copper is also ... Health (NIH), researchers at Worcester Polytechnic Institute (WPI) will conduct a systematic study ...
(Date:11/24/2015)... India , November 24, 2015 ... a new market research report "Oligonucleotide Synthesis Market by ... Application (PCR, Gene Synthesis, Diagnostic, DNA, RNAi), End-User (Research, ... 2020", published by MarketsandMarkets, the market is expected to ... Million in 2015, at a CAGR of 10.1% during ...
(Date:11/24/2015)... 2015 --> ... released by Transparency Market Research, the global non-invasive prenatal ... of 17.5% during the period between 2014 and 2022. ... Industry Analysis, Size, Volume, Share, Growth, Trends and Forecast ... market to reach a valuation of US$2.38 bn by ...
Breaking Biology Technology: