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Hello everyone, my name is Shohei Hattori. I've been in China for two years, so I'm still learning Chinese. Please allow me to present in English today. I'll briefly overview my achievements and the proposal for today, with more details in the application sheet. I am from Tokyo, Japan, and earned my Ph.D. from the Tokyo Institute of Technology in 2012. In 2022, I joined Nanjing University with the HYWQ grant. My publication record includes papers as the first author in high-profile journals like PNAS and Science Advances. I have received several awards, including the Emerging Investigator Award from the International Association of Geochemistry. I work internationally and aim to connect the geochemistry societies of China and Japan as a member of the International Liaison Committee of the Geochemical Society of Japan. Today's proposal is also an international collaboration with Japanese and US colleagues. Next is about Research Background My research focuses on the impact of human activities on climate change and air quality, particularly chemical reactions in the atmosphere and historical changes in aerosols and oxidants. There is little information on chemical reactions in the atmosphere and historical changes in atmospheric oxidants. I use Δ17O isotope signatures for the analysis of atmospheric chemical reactions across many fields. A significant achievement related to the proposed research is our Science Advances paper, where we used Δ17O signatures of sulfate in SE-Dome ice cores to trace chemical reactions over time. This study explained the slow decrease in sulfate aerosols despite drastic SO2 reduction. The proposed project will use this isotope technique for many species to investigate the relationship between human activity and chemical reactions over the last 200 years. To do this, we will apply our isotope techniques developed in Nanjing University to precious ice core drilled in SE-Dome, led by Hokkaido University Japan. Additionally, we aim to develop an atmospheric model through collaboration with Kanazawa University and University of Washington. Next is the importance of international collaboration scheme. I have been part of the SE-Dome ice core project led by Hokkaido University since 2015. Our collaboration has already produced several research papers. At Nanjing University, I have developed unique methods for measuring isotopes and am ready to apply this to precious ice core samples. Therefore, we are ready and need this international collaboration scheme. Our research team includes three Ph.D. students with potential for new members. I visited Prof. Iizuka in Hokkaido last week, and one of my group members, Wei Zhao, is currently working on ice core processing there. Prof. Sakiko Ishino visited Nanjing in March to develop modeling work with my student. Thus, this collaboration and exchange have already started and will grow with new members as listed here. Let me summarize. To understand the relationship between human activity and atmospheric chemistry, we will analyze Δ17O sulfate, nitrate, and MSA in the SE-Dome II ice core. We aim to build a high-precision model for chemical processes and analyze future climate change and air quality scenarios, considering chemical feedback mechanisms. This research is feasible based on my recent achievements and international collaboration. It is scientifically important to understand the chemical feedback between human activity and the atmosphere, aiding effective emission control strategies globally, including in China. Additionally, this collaboration will provide valuable opportunities for young students to engage in international collaboration and build strong connections with universities outside China. With this summary, I hope to receive your support. Thank you for your attention.