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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. Today, I will overview about four main points, and more details can be found in handouts. First, I'll talk about my achievement. I am from Tokyo, Japan, and I got my Ph.D. from the Tokyo Institute of Technology in 2012. After that, I became an Assistant Professor there. 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 as summarized here. Here is summary of my publication record. I have published many papers as 1st author in high-profile journals, including two in PNAS, one in Science Advances as 1st author, and many in specialized journals. After coming to Nanjing in 2022, I have continued high-level research with new research members and published papers in great journals like Nature Geoscience. In addition, I have received many awards. My research covers multiple fields, thus I received awards from three different academic societies. I also received the Environmental Sustainability Research Award from ASAHI-beer 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 is the list of my funding record. In Japan, I got many research grants, and in China, I have started getting competitive grants like HWYQ. The research interest is the impact of human activities on climate change and air quality, especially in polar regions. As highlighted in recent paper in Nature Climate Change, atmospheric 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. Thus, using the Δ17O isotope signature, which has different values for different formation pathways, I have been working on the analysis of atmospheric chemical reactions for many different fields as shown here. One significant achievement is my 2021 Science Advances paper. Applying Δ17O signatures of sulfate in the ice core record, we can trace back chemical reactions into the past. Together with atmospheric transport modeling, we revealed that atmospheric sulfate formation processes have changed since the 1980s. This explains why the decrease in sulfate aerosols is slower than the drastic SO2 reduction after emission control in western countries. This study has been cited in three review papers in different academic fields, which highlights its wide impact. Moreover, I have conducted impactful research with publishing papers in PNAS and EST in recent years. As you can see, I have developed original analytical methods by myself and then apply them for valuable environmental samples, leading to important discoveries. This is the key strategy keeps my research original, unique and creative. Next, I will discuss my proposed project. In this project, applying Δ17O signatures of aerosols species 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 for biogenic DMS oxidation process. DMS oxidation to sulfate and MSA is complex but crucial for understanding aerosol-cloud interactions in polar regions. Thus, analyzing Δ17O to MSA for the first in the world, we aim to investigate how human activities affect natural aerosols and cloud formation. With understanding key changes in atmospheric chemical process including feedbacks, we plan to update atmospheric chemical processes in models. To do this, several challenges needed to be addressed as shown here. However, we have already overcome these difficulties by our newly developed analytical methods using Orbitrap-MS, the highly reliable SE-Dome ice core drilled with my Japanese colleagues, and our own isotope-inclusive atmospheric chemistry model developed. Next is research content. We plan to to reconstruct the atmospheric formation processes of sulfate, nitrate, and MSA based onΔ17O isotope signatures using the SE-Dome II ice core. Using the observed Δ17O data, we will update and validate chemistry in the model to build a high-precision model for chemistry process. Using this model, with future human emission and climate scenarios, we will analyze climate change and air quality until the end of this century. The innovative points are the combination of valuable samples, unique methods, and new isotope-implemented GEOS-Chem model. Additionally, we believe that it is unique that this study not only reconstructs the past record but also aims to predict future and propose solution. Last part is feasibility. Nanjing University and the State Key Laboratory provide a strong platform for this research. Particularly, ICIER, established in 2019, has the world’s best isotope analysis equipment, making it possible to conduct the analyses proposed in this research. Note that only a few institutions over the world 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 before application. Thus, we can start immediately upon approval. This is our research team. I have 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 with my Japanese and American colleagues, based on over 10 years strong collaboration. Additionally, a French researcher has expressed interest in joining us. Overall, this international collaboration between China, Japan, and the US, along with new young members from Nanjing University and France, I believe that it is promising to have excellent research advancement through new interactions. With this summary, I am happy if I can receive the support from you. Thank you for your attention.