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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. Today, I will explain my research plan for international collaboration with Professor Yoshinori Iizuka at Hokkaido University. First, I'll briefly overview my achievements and the proposal for today. 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. Here I summarized my publication record including representative papers as the first author in high-profile journals like PNAS and Science Advances. I also 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. Let me start from 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 aerosols and oxidants. Thus, I use Δ17O isotope signatures that record chemical formation pathway, to analyze atmospheric chemical reactions across many fields as shown here. A significant achievement related to the proposed research is our Science Advances paper published 2021, where we used Δ17O signatures of sulfate in SE-Dome ice cores to trace back chemical reactions into the past. This study revealed that sulfate formation has been changed since 1980s, and explained the mechanisms why decrease in sulfate aerosols is much slower than the drastic SO2 reduction in western country. 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 Greenland SE-Dome, led by Professor Yoshinori Iizuka at Hokkaido University Japan. Additionally, we aim to develop an atmospheric model implemented with isotope tracers 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 as shown here, and new SE-Dome II ice core is now available for our isotope study. 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. Actually I visited Prof. Iizuka in Hokkaido last week, and one of my group members, Wei Zhao, is currently working on ice core processing there. For modeling part, Prof. Sakiko Ishino from Kanazawa University visited Nanjing in March to develop new isotope modeling work with my student Yihang Hong. 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, MSA, and H2O2 in the SE-Dome II ice core stored in Hokkaido University. 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 would like to emphasize that we are ready. So, I hope to receive your support. Thank you for your attention.