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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 fluent in Chinese. Please allow me to present in English today. Thank you for inviting me. Today, I will talk about four main points. More details are in the application form and at the end of the PPT slides. First, I'll talk about my research skills through my past work. I am from Tokyo, Japan, and I got my Ph.D. from the Tokyo Institute of Technology in 2012. After a three-month postdoctoral fellowship, I became an Assistant Professor. After nine years of teaching and research, I joined Nanjing University in 2022 with the HYWQ grant to continue my research. My research focuses on environmental geochemistry, including atmospheric and biogeochemical studies. I specialize in stable isotopes, especially 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, publishing diverse papers. 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 specialized 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. My research covers multiple fields, leading to 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 got many research grants, and in China, I have started getting competitive grants like HWYQ. Now in my third year in China, I am proposing a new research project. The background of my research involves the impact of human activities on climate change and air quality, especially in polar regions. A recent paper in Nature Climate Change highlighted that aerosols in polar regions are important for climate change, but there are many uncertainties. Specifically, there is little information on chemical reactions in the atmosphere that form aerosols and historical changes in atmospheric oxidants. Using the Δ17O isotope signature, which has different values for different formation pathways, I have been working on the reconstruction of atmospheric chemical reactions from observations from many different times and places. One significant achievement is my 2021 Science Advances paper. Using a combination of Δ17O signatures and ice cores that preserve past aerosols, we can trace back chemical reactions. Together with atmospheric transport modeling, we revealed changes in atmospheric sulfate formation processes since the 1980s. This explains why the decrease in sulfate aerosols is slower than the drastic SO2 reduction after emission control. This study has been cited in review papers in international journals on three different fields, highlighting its wide impact. Moreover, I have conducted impactful research published in PNAS and EST in recent years. My research is unique because I use innovative isotope analysis techniques that I developed myself on valuable environmental samples, leading to important discoveries. This strategy keeps my research unique and creative. Next, I will discuss my proposed project. In this research, using Δ17O signatures for ice core research, I want to study changes in atmospheric chemical reactions in response to human activities. Using an ice core covering the last 200 years, we will analyze from pre-industrial times to the present day. This is important for studying sulfate and nitrate mainly from human activity. Additionally, I plan to start a new application of Δ17O 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 investigate how human activities affect natural aerosols and cloud formation. We aim to understand these changes and accurately reflect these complex atmospheric chemical processes in models. To do this research, several challenges need to be addressed, including the lack of analytical methods, appropriate ice core archives, and validation methods for chemical processes in models. However, we have overcome these difficulties with new analytical methods using Orbitrap-MS, the SE-Dome ice core drilled with my Japanese colleagues, and the development of our own isotope-inclusive atmospheric chemistry model. This research aims to reconstruct the atmospheric chemistry processes of sulfate, nitrate, and MSA aerosol formations using Δ17O isotope data from the SE-Dome II ice core. By updating our model with validation of multiple Δ17O signatures and considering chemical feedback mechanisms, we will build a high-precision model. This model, incorporating future human activity scenarios, will analyze climate change and air quality until the end of this century, proposing solutions to environmental problems. The innovative points of this research are the combination of valuable samples, unique analytical methods developed by us, and new analysis using an isotope-implemented GEOS-Chem model. Additionally, it is unique that this study not only reconstructs the past record but also aims to propose the most effective pollution management solutions. Finally, let me discuss the feasibility of the research. Nanjing University and the State Key Laboratory provide a strong platform for this research. ICIER, established in 2019, has the world’s best isotope analysis equipment, making it possible to conduct the analyses proposed in this research. Only a few institutions can conduct such innovative studies. This research is highly feasible because 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 modeling work internationally, leveraging over a decade of strong collaboration. 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.