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China has made important progress in the field of broadband cavity enhanced absorption spectroscopy
[ China Instrument Network Instrument R&D ] Recently, An Guangxie Xie Pinhua Researcher Group has made significant progress in broadband cavity enhanced absorption spectroscopy and farmland HONO emission flux research. The relevant research results are published in the international journal Atmospheric Environment (2019, 196: 10-19).
As a precursor of OH radicals, HONO plays an important role in the atmosphere, which has attracted wide attention in the scientific community due to its promotion of ozone and photochemical smog formation. In recent years, a large number of studies have shown that the contribution of HONO to OH radicals is not only manifested in the early morning, but also throughout the day, and the contribution to the initial source of OH radicals is 50% (summer) to 80% (winter). Considering the known source and sink of HONO, the difference between the simulated value obtained by the model calculation and the actual external field observation is large, especially during the daytime HONO concentration, the unknown source strength reaches 0.06-5ppbv h-1, but for the specific source pathway, there is More controversial.
The research team Qin Min, associate researcher and Tang Ke, first applied the dynamic box method combined with IBBCEAS technology to the HONO emission flux measurement in farmland. The observation results were an order of magnitude higher than the field results reported in the literature, revealing that the fertilized soil in the North China Plain is very The strong HONO emission potential, for the first time through the field confirmed that soil HONO emissions are different from other sources. Atmospheric Environment's two reviewers gave a high evaluation of the research work, saying that "this is a clever work for studying soil HONO emissions."
The research work was funded by the National Natural Science Foundation of China Major Research Projects and the National Natural Science Foundation's International (Regional) Cooperation and Exchange (Chinese-English) project.
(Original title: Anguang's broadband cavity enhanced absorption spectroscopy technology and farmland HONO emission flux research has made important progress)