A seemingly ordinary topic, being able to determine the fate of charcoal is critical in helping scientists balance the global carbon budget, which in turn can help understand and mitigate climate change. However, until now, scientists only had scientific guesses as to what happens to charcoal once it’s incorporated into soil. Surprisingly, most were wrong.
Natural fire of boreal forest
Photo by Stefan Doerr, Swansea University
“Most scientists thought charcoal was resistant. They thought, once it’s incorporated into the soils, it would stay there,” Jaffé said. “But if that were the case, the soils would be black.”
Charcoal, or black carbon (BC), is a residue generated by combustion sources including wild fires and the burning of fossil fuels. Most of the charcoal in nature is from wild fires and combustion of biomass in general, according to the authors of this study. When charcoal forms it is typically deposited into the soil.
“From a chemical perspective, no one really thought it dissolves, but it does,” Jaffé said. “It doesn’t accumulate like we had believed for a long time. Rather, it is exported into wetlands and rivers, eventually making its way to the oceans.” Thorsten Dittmar, head of the Max Planck Research Group for Marine Geochemistry at the University Oldenburg in Germany, was also tracing the paths of charcoal, only from an oceanography perspective.
Thorsten Dittmar explains: “To understand the oceans we have to understand also the processes on the land, from where the organic load enters the seas. Therefore, our international team took 174 samples from fresh water sites all over the world like the Amazon River, the Congo, the Yangtze and arctic sites. In these water samples we measured dissolved charcoal. Surprisingly, in any river across the world about 10% of organic carbon that is dissolved in the water came from charcoal. With this robust relationship at hand we were able to use older scientific studies regarding organic carbon flux in rivers and estimated the global flux of dissolved charcoal.”
To map out a much more comprehensive picture, the research teams joined forces, along with researchers from Skidaway Institute of Oceanography in Georgia, Woods Hole Research Center in Massachusetts, the USDA Forest Service, and the University of Helsinki in Finland. The collaborative efforts have mapped out the conclusion that charcoal is making its way to the world’s waters. Dittmar comments that “Now, we have shown that fire is probably an integral part of the global carbon cycle”.
This one single discovery, according to Jaffé and co-workers, carries significant implications for bioengineering. The global carbon budget is a balancing act between sources that produce carbon and sinks that remove it. According to the research, the amount of dissolved charcoal transported to the oceans is keeping pace with the total charcoal generated by fires annually on a global scale.Critical: Biochar carbon sequestration techniques and Climate Change
Rudolf Jaffé, Yan Ding, Jutta Niggemann, Anssi V. Vähätalo, Aron Stubbins, Robert G.M. Spencer, John Campbell, Thorsten Dittmar. Science 2013. DOI: 10.1126/science.1231476Involved institutions
Dr. Manfred Schloesser | Max-Planck-Institut
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