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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 still not good at speaking in Chinese. Please allow me to present in English today. Today, I will overview about this 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 direction is environmental geochemistry, including atmospheric chemistry and biogeochemistry. I specialize in stable isotopes, especially using mass-independent fractionation to study Δ17O anomalies in chemical species. My work overlaps among geochemistry, glaciology, and atmospheric chemistry with unique isotope techniques, with 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. 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. I received young scientist awards from three different academic societies. I also received an Award from ASAHI-beer related organizations, and this year, I received the Emerging Investigator Award from the International Association of Geochemistry. This is about invited presentations and international activities. 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. My 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 and historical changes in atmospheric oxidants. Because Δ17O isotope signatures are different for different formation pathways, I use it for the analysis of atmospheric chemical reactions for many different fields as shown here. One significant achievement is this Science Advances paper. In this study, we applied Δ17O signatures of sulfate to the ice core, to trace back chemical reactions into the past. We revealed the acidity-changes in atmospheric sulfate formation pathways 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. Because of time limitation I skip this slide, but I want to highlight my research strategy. As you can see, by developing original analytical method by myself, I have found unique environmental findings publishable in high-profile journals like PNAS. This is the key strategy keep my research original, unique and creative. OK, next I will discuss my proposed project. In this project, using unique Δ17O signature for ice core, we plant to investigate the relationship between human activity and chemical reaction over the last 200 years that cover from pre-industrial time 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 signature for biogenic natural DMS oxidation process, because this process is complex but crucial for understanding aerosol-cloud interactions in polar regions. Thus, by analyzing Δ17O to MSA for the first in the world, we aim to investigate how human activities affect natural aerosol formation and cloud formation. Besides, with understanding key changes in atmospheric chemical process including feedbacks, we plan to update atmospheric chemical processes in models. This slide shows that how we could overcome the limitation of previous studies. By this three part including our newly technology using Orbitrap-MS, the highly reliable SE-Dome ice core drilled with my Japanese colleagues, and our own isotope-inclusive atmospheric chemistry model, we will be able to conduct this study that cannot be done by others. Let me explain research contents. To understand relationship between human activity and chemistry in the atmosphere, we plan to analyze Δ17O sulfate, nitrate, and MSA in the SE-Dome II ice core covering last 200 years. 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 also analyze climate change and air quality until the end of this century. The innovative points of this proposal are the combination of valuable samples, unique analytical methods, and new isotope-implemented GEOS-Chem model, which almost only we can do such study. 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 here. 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 components 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.