It is important to take into account these biogeochemical feedbacks in research on climate change, according to an international research group led by ecosystems researcher Almut Arneth from Lund University.
The research group has assembled an overview of the current knowledge on this subject, which has been published in Nature Geoscience on 25 July 2010. In it they describe a range of mechanisms that are linked to a warmer climate: increased carbon dioxide and methane emissions from wetlands, emissions of nitrogen oxides from the ground, emissions of volatile organic compounds from forests, and emissions of gases and soot from fires.
These mechanisms affect the amount of greenhouse gases in the lower atmosphere, including ozone, which not only has an impact on the climate but which also impacts negatively on vegetation and people. These mechanisms become stronger as the temperature rises, while they also contribute to warming the climate.
“A number of these mechanisms have not been well researched. In some cases, we know all too little about how they influence one another, for example how changes in the nitrogen cycle affect the uptake of carbon dioxide by vegetation. Together these could be very significant for the climate”, says Almut Arneth.
Vegetation absorbs carbon dioxide and this currently slows down the rise in temperature caused by the emissions. However, in a warmer climate this ‘damper’ does not work as well and this could mean a significant reduction in the absorption of carbon dioxide by vegetation in the future, in addition to increased release of other climate-active gases.
In a warming climate, the help currently provided by vegetation to slow climate change could become smaller and smaller, say the researchers behind the article in Nature Geoscience. Therefore, their view is that these feedback mechanisms must be taken into account in the calculations in future climate models.
The work has formed part of iLEAPS/IGBP, the Integrated Land Ecosystem-Atmosphere Processes Study from the International Geosphere-Biosphere Programme.
For more information please contact Almut Arneth, email@example.com.
Ingemar Björklund | idw
Global study of world's beaches shows threat to protected areas
19.07.2018 | NASA/Goddard Space Flight Center
NSF-supported researchers to present new results on hurricanes and other extreme events
19.07.2018 | National Science Foundation
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences