Advances in OH Radical Tomography Detection in the Upper and Middle Atmosphere in Anko Institute

[ China Instrument Network Instrument R&D ] At present, the mechanism of OH free radicals in the mid-to-upper atmosphere on the earth's major physical issues such as atmospheric physical and chemical processes, global climate change, atmospheric ozone levels, and acid deposition is still unclear.

Spectrometer Airborne Mounting Azimuth and Airborne Actual Spectroscopy Data

The OH radical hyperspectral detection technique in the middle and upper atmospheres researched by the Xiong Wei Research Fellow of the Anhui Institute of Optics and Engineering of the Chinese Academy of Sciences is expected to improve the level of China's atmospheric environmental stereo detection technology, to grasp the global climate change, improve the meteorological and climatic observation level, and grasp the atmospheric environment information. Other aspects are of great significance. Recently, the relevant research work was titled "The OH Radical Super Resolution Spatial Heterodyne Spectrometer in the Middle and Upper Atmospheres", and was published as the cover article in the 38th Issue, 20th Issue, 2018, Optics Journal.

As an “oxidant”, the middle and upper atmosphere parameters OH radicals are of great significance for human understanding of the chemical composition of the middle layer, especially for the destruction of the ozone layer and the inversion of water vapor concentration at the top of the middle layer. Combining one-dimensional field-of-view imaging technology with spatial heterodyne interference spectroscopy, and using two-dimensional orthogonal observation modes, it is hopeful to achieve three-dimensional tomographic detection of the OH radical number density in the middle and upper atmospheres.

Hyperspectral atmospheric tomography technology is not only the problem of weak signal OH radical detection ability, but also involves methods for obtaining atmospheric three-dimensional data, methods related to information retrieval, and other issues that need to be thoroughly studied and experimentally verified. . Therefore, it is very necessary to carry out the research of this project to systematically solve the exploration theories, techniques and applications involved.

Prof. Luo Haiyan, associate researcher, and others started the design of the orthogonal tomographic spatial resolution heterodyne spectrometer scheme in 2013, combined with the research on high-sensitivity ultraviolet low-light CCD detection technology and associate researcher Shi Hailiang et al. The research of technical methods, OH radical inversion methods, etc., for the first time completed the development of a spectral spectrometer better than 0.008 nm.

During July-November 2017, researchers completed ground-based direct sun and scattering spectrometry tests and aviation flight tests. In the vicinity of Shandong Weihai Airport, the Y-12 aircraft of the China Maritime Supervision Northern Airlines Corps was used for aviation flight test, and two flights were conducted, with about 10 hours of flight. The spectrometer's capability of detecting very high spectrum of atmospheric scattering signals in different regions and different observational geometries was realized, and an effective and feasible technical solution was provided for the realization of the OH radical tomographic detection system in the middle and upper atmospheres of the satellite.

This new detection technology has potential application value in the fine detection of atmospheric components. The research work was funded by the National Natural Science Foundation of China, the National Defense Science and Technology Bureau and the Civil Aviation Advanced Research Project.

(Original title: Anguang has made new progress in the research of OH radical tomography in middle and upper atmospheres)