Observations and Data Analysis of Pbl Structure and Its Thermodynamic Processes

The United States National Academies published a ten-year strategic report on Earth observation in 2018 that mentions the scientific urgency of mastering the planetary boundary layer (PBL) and the lower troposphere. This project is based on the international development trend, and proposes a PBL integrated observation experimental framework. By integrating vertical high-resolution lidars, wind anemometers, drones, and miniature sounding observation technologies, it will provide a comprehensive overview of high-altitude pollution events under weak synoptic weather conditions. In order to study the situation, intensive observations from the offshore to the mountainous areas in the north, middle, and south of Taiwan will be deployed to investigate how air pollutants are vertically affected by the multiple effects of PBL thermodynamic processes and sea-land wind circulation. The evolution and horizontal transmission of air pollutants, as well as their correlation to near-surface PM2.5 concentrations will be studied. This observation data will also provide the input for the data assimilation system and the basis for subsequent model simulation technology improvements. The ultimate outcome is a comprehensive PBL observation strategy which can support a better air quality prediction by models. We propose this idea as a three-year plan. We hope through the project funded, the following three scientific research objectives can be done: (1) Characterize the structure and thermodynamic process of PBL under weak synoptic weather conditions. (2) Clarify the correlation between local circulation/eddy and air pollutants under weak synoptic weather conditions. (3) Analyze the interaction mechanism between PBL-aerosol-radiation. In addition, with the implementation of this project, it is expected that it will also assist in the development of the following important technologies, including PBL layer top height detection technology, lidar vertical PM2.5 concentration retrieval, and PBL thermodynamic data analysis technology.