An international collaborative research group led by Assistant Professor Masayuki Kondo of the Environmental Remote Sensing Research Center of Chiba University analyzed the carbon dioxide (CO2) balance in the atmosphere and land by integrating multiple existing methods. We succeeded in reducing the variation in estimated values seen in numerical models and observation methods.
According to the National Institute for Environmental Studies, the research group aggregated and analyzed the terrestrial CO2 balance by multiple numerical models and observation methods submitted by universities and research institutes in Japan and overseas.As a result, at the time of the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) published from 2013 to 2014, there was a discrepancy in the estimation results due to differences in the definitions of numerical models and observation methods. I found out that it was a fold.
Therefore, when the definitions were unified and the estimation results were corrected, the land CO2 balance could be matched by a high system.By examining the accuracy of each method in detail, the research group says that it is possible to eliminate the difference in results on a finer scale.
Global warming progresses by emitting about 110 billion tons of carbon annually, and some percentage of this is absorbed by terrestrial ecosystems such as forests and agricultural lands.For this reason, it is necessary to accurately estimate the absorption capacity of terrestrial ecosystems, but at the time of the IPCC Fifth Assessment Report, the estimation results varied widely.
* Amount of carbon dioxide balance in the land area Sum of CO2 emissions and absorption in the atmosphere and land
Paper information:[Global Change Biology] State of the science in reconciling top-down and bottom-up approaches for terrestrial CO2 budget
