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Hello everyone, my name is Shohei Hattori from Nanjing University. I've been in China for two years, so I'm not yet proficient in Chinese. Please allow me to present in English today. Thank you for inviting me for this chance. Today, I will cover four main points, additional information is available in the application form and at the end of the PPT slides. First, I'll talk about my research capabilities through my past achievements. I'm originally from Tokyo, Japan, and received my Ph.D. from the Tokyo Institute of Technology in 2012. After a three-month postdoctoral fellowship, I became an Assistant Professor. With nine years of teaching and research experience, I joined Nanjing University in 2022 with HYWQ grant program to advance my research. My research focuses on environmental geochemistry, including atmospheric and biogeochemical studies. I specialize in stable isotopes, particularly using mass-independent fractionation to study Δ17O anomalies in chemical reactions in the atmosphere and biosphere. I work in interdisciplinary fields of geochemistry, glaciology, and atmospheric chemistry using unique isotope techniques. Here are some of my key research achievements. I have published many papers in high-level journals, including two in PNAS, one in Science Advances, and many in environment, chemistry and atmospheric journals. Since moving to Nanjing in 2022, I have continued high-level research, publishing papers with new research members in journals like Nature Geoscience. In addition to publishing papers, I have received many awards. Because my research spans multiple fields, I could receive awards from three different academic societies. In 2022, I received the Environmental Sustainability Research Award from ASAHI-related organizations, and this year, I received the Emerging Investigator Award from the International Association of Geochemistry. I have given invited lectures at many conferences and worked internationally. Currently, I am working to connect the geochemistry societies of China and Japan as a member of the International Liaison Committee of the Geochemical Society of Japan. Here are the research grants I have received. In Japan, I secured numerous research grants, and in China, I have begun obtaining competitive grants like HWYQ. Now in my third year in China, I am proposing a new research project. The background of this research involves the impact of human activities on climate change and air quality, particularly in polar aerosols. As highlighted in a recent paper in Nature Climate Change, climate change due to aerosols in polar regions is critical, yet many uncertainties remain. Specifically, there is little information on atmospheric chemical reactions involving aerosol formation and historical changes in atmospheric oxidants. Thus, using the Δ17O isotope signature that is different among different formation pathways. I have been working for the reconstruction of atmospheric chemical reactions from observations from many diverse time and places. One significant achievement is my 2021 Science Advances paper. Using combination of Δ17O signatures and ice cores that preserves past aerosols, we can trace back chemical reactions. Together with the analysis by atmospheric transport modeling, we revealed changes in atmospheric sulfate formation processes since the 1980s, that explain why decrease of sulfate aerosols are slower than drastic SO2 reduction after emission control. This study has been cited in review papers in international journals on atmospheric chemistry, geochemistry, and physical chemistry, highlighting its impact. Moreover, I have conducted impactful research at PNAS in 2020 and EST in 2023. You can see that this achievements are done by combination of new analytical development, and application for the field study. My research uniqueness is application of innovative isotope analysis techniques developed by myself to precious environmental samples, leading to important discoveries. This is the strategy I have to keep being unique and creative. Next, I'll explain the research for this project. In proposed research, by using D17O signature for ice core research, I would like to elucidate the changes in atmospheric chemical reactions responded to fluctuation of human activities. For this, using ice core covering last 200 years, we cover from preindustrial to present day. This is of course important for sulfate or nitrate mainly from Anthropogenic activity, I plan to start new application of D17O for MSA. The oxidation process of biogenic DMS to sulfate and MSA is complex but crucial for understanding aerosol-cloud interactions in polar regions. Our study aims to be the first in the world to apply Δ17O to MSA analysis to analyze how human activities also affect natural aerosols and cloud formation, which is poorly understood. We aim to elucidate these changes and accurately reflect these complex atmospheric chemical processes into atmospheric models. To do this research, several challenges need to be addressed, including the lack of analytical methods, appropriate ice cores archive, and validation methods for chemical processes in models. However, we have overcome these difficulties with our newly analytical methods using Orbitrap-MS, the SE-Dome ice core drilled by my Japanese colleagues, and the development of our own isotope-inclusive atmospheric chemistry model. Next, I will discuss the research contents This research aims to reconstruct the atmospheric chemistry processes of sulfate, nitrate, and MSA aerosols formations using Δ17O isotope data obtained from the SE-Dome II ice core. By updating our model with validation of multiple D17O signatures, with considering chemical feedback mechanisms, we will build a high-precision model in terms of chemistry. This model, incorporating future human activity scenarios, will analyze climate change and air quality up to 2050 and 2100, proposing solutions to environmental problems. The innovative points of this research is combination of precious sample, unique analytical method developed by us, and new analysis using isotope-implemented GEOS-Chem moodel. Additionally, it is unique that this study not only reconstruct the past record, using newly developed the model, we also plan to propose most effective pollution management as solution. Finally, let me discuss the feasibility of the research. Nanjing University and the State Key Laboratory provide a robust platform for this research. ICIER, established in 2019, has the world’s best isotope analysis equipment, making it possible the analyses proposed in this research. There are only a few institutions capable of conducting such innovative study. This research is highly feasible, as it is based on my recent achievements. As summarized here, all three innovative points have been well-prepared for this research proposal. Thus, we can start immediately upon approval. This is our research team. I have secured three Ph.D. students to collaborate with me at Nanjing University, with the potential for more. We will conduct ice core sample processing and modelling work internationally, and I have a decade of strong collaboration with them. Additionally, a French ice core researcher has expressed interest in joining us as a postdoctoral fellow. This international collaboration between China, Japan, and the US, along with new young members from Nanjing University and France, promises excellent research advancement through new interactions. With this preparation, I am here today to discuss our new research. Thank you for your attention.