New research shows that SST can be used to predict global atmospheric methane changes


Methane is the second largest greenhouse gas after carbon dioxide, and its global warming potential should not be underestimated.Tropical land emissions accounted for more than 80 percent of the change in global methane concentration from 2010 to 2019, according to the Institute of Atmospheric Physics under the Chinese Academy of Sciences.The findings were published online March 16 in the journal Nature Communications.Since the Industrial Revolution, atmospheric methane concentrations have more than doubled, and the greenhouse effect from doubling methane accounts for about 20 percent of global warming.The global warming potential of methane is 84 times greater than that of carbon dioxide over a 20-year time scale.”Methane has a life span of only 8-11 years, which is about one-tenth that of CARBON dioxide.”Said Liu Yi, one of the paper’s authors and a researcher at the Institute of Atmospheric Physics of the Chinese Academy of Sciences.Zhu Sihong, a doctor at the Institute of Atmospheric Physics of the Chinese Academy of Sciences and the third author of the paper, told the Beijing News that methane emissions can be divided into man-made and natural emissions.Anthropogenic emissions include coal and oil and gas extraction, agricultural production (such as methane from livestock such as cattle and paddy fields) and landfills, while natural emissions include wetlands, biomass burning and frozen soil.”It is now widely accepted that livestock has a lot of potential to reduce emissions.”Tropical terrestrial emissions contribute more than 80% to global methane concentration Changes How to predict atmospheric methane concentration changes using existing observational forecasting tools?’The problem is difficult and there is a research gap,’ Said Mr. Liu.Using methane observations from the Japanese Carbon Monitoring Satellite, the researchers found that tropical terrestrial emissions contributed more than 80 percent of the change in global methane concentrations.”The tropics are an important source of methane emissions, accounting for about 60 percent of global emissions.”The study included the Amazon Basin and the Congo Plain, two regions with high methane emissions from wetlands and freshwater ecosystems, Zhu said.GOSAT, a greenhouse gas exploration satellite launched by Japan in 2009, has been widely used in carbon dioxide and methane emission inversion.The researchers used data from GOSAT observations from 2010 to 2019, she said.”In the past, there were double calculations in emission source inventories, and the errors were relatively large.This study inverts atmospheric observations to get a more accurate picture of methane emissions.”The SST anomaly can affect tropical atmospheric circulation and lead to changes in precipitation on land, zhu said, adding that since anaerobic environments are necessary for methane production, increased soil water content caused by precipitation can promote methane emissions.”We think current SST forecasts can be used to help predict global atmospheric methane changes.”Feng Liang, lead author of the paper from the University of Edinburgh’s School of Earth Sciences.Liu’s team says there is still no international consensus on China’s methane emissions and how they are changing.In the future, the team will further use multi-platform observations to provide a more accurate assessment of China’s methane emissions and provide scientific and technical support for China’s carbon neutrality goals.Edited by Beijing News reporter Zhang Lu and proofread by Fan Yijing and Li Lijun

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