Professor, Department of Physics and Materials Science, Anhui University, Hefei, China

Biograph
Professor Jingsong LI received his PhD in 2008 at Hefei Institute of Physical Science (HIPS), Chinese Academy of Sciences (CAS). He has job experiences as a researcher at Reims University (France), Max Planck Institute for Chemistry (Germany), and Swiss Federal Laboratories for Materials Science and Technology (Switzerland) for several years. He came back to China in 2013 and joined Department of Physics and Materials Science, Anhui University (AHU), working on development and implementation of novel mid-infrared quantum cascade lasers, sensitive spectroscopy techniques for atmospheric chemistry, soil ecosystems and environmental applications, etc. Currently Dr Li is a professor at AHU and the director of Laser Spectroscopy and Sensing Lab, and the dean of Photoelectric Information Department of AHU. He is a member of SPIE, IEEE, OSA, and EGU. He has authored over 60 peer-refereed SCI articles and more than 30 invited conference presentations.

Speech Title: High precision measurements of ecosystem–atmosphere trace gases exchange using mid-IR quantum cascade laser spectrometer

Abstract: Atmospheric greenhouse gases and trace gases have important influence on global climate and temperature change. Agricultural activities are estimated to be one of the largest global sources to the atmosphere. Anthropogenic pollution source emissions are increasing predominantly due to agricultural intensification and have important implications for air quality, radiative forcing, and carbon and nitrogen deposition to ecosystems. In this paper, we introduce a newly designed mid-infrared (MIR) quantum cascade laser (QCL) spectrometer to measure CH₄ CO, N₂O and water vapor in ambient air, and investigate the exchange of these gases between atmosphere and soil. This new method takes advantage of the strong absorption lines of molecules in the MIR, and the sensitivity and fast response time offered by tunable laser absorption spectroscopy with room temperature continuous wave QCL. This approach offers an online measurement of trace volatiles at ambient atmospheric concentrations without the need for any preconcentration or gas separation. Lab performance and field deployment will be presented in this study.