EAGER: Development of a Novel Double-resonance Fiber-laser-induced Fluorescence Instrument for Long-term, High-sensitivity, Interference-free Measurements of Hydroxyl Radical (OH)

该项目的重点是开发一种基于红外、紫外、激光诱导荧光（IR-UV LIF）的测量大气中环境羟基自由基（OH）的新方法。该项目是与德国Forschungszentrum Jülich（FZJ）能源和气候研究所所长Andreas Wahner教授实验室的科学家合作开展的。以前对这种方法的基础研究已经发现，它是高度敏感的，不受化学干扰，但它的使用已被限制在物理化学实验室，由于与保持激光在现场的稳定性相关的限制。科学家们将探索一种高选择性的光谱方法与光纤激光技术的最新进展相结合，以开发一种新型的OH LIF仪器。羟基自由基是大气中最重要的氧化物种。它与空气中的许多化学物质发生反应，氧化它们，并作为最终去除空气污染物和温室气体等重要痕量气体的清洁机制。正在开发的新方法预计最终将在全球范围内适用于现场使用，从而能够长期测量羟基自由基。由此产生的数据对于改进空气质量和气候变化模型至关重要。

This project focuses on the development of a novel method for measuring ambient hydroxyl radicals (OH) in the atmosphere, based on the use of infra-red, ultra-violet, laser-induced fluorescence (IR-UV LIF). The project is a collaborate effort with scientists in the laboratory of Professor Dr. Andreas Wahner, Director of the Institute for Energy and Climate Research at Forschungszentrum Jülich (FZJ) in Germany. Previous fundamental studies on this method have found that it is highly sensitive and free from chemical interferences, but its use has been restricted to physical-chemistry laboratories due to limitations associated with maintaining the stability of the laser in the field. The scientists will explore the coupling of a highly selective spectroscopic method to the latest advances in fiber laser technology for the development of a novel OH LIF instrument.The hydroxyl radical is the most important oxidizing species in the atmosphere. It reacts with many chemical species in air, oxidizing them and serving as a cleansing mechanism for the ultimate removal of important trace gases such as air pollutants and greenhouse gases. The novel method being developed is expected eventually to be adapted worldwide for field use, enabling long-term measurements of the hydroxyl radical. The resulting data will be critical for improving models of air quality and climate change.