Organic carbon (OC) and elemental carbon (EC) in PM2.5 influence regional climate change by scattering and absorbing solar radiation. Recent attention has focused on the long-range transport of OC and EC to high-altitude regions due to their potential role in accelerating spring snowmelt. Although subalpine and alpine areas account for only about 1% of South Korea, these high-elevation zones are highly vulnerable to climate change and provide important insights into how ecosystems may respond and adapt in the future. We collected 29 PM2.5 samples near Nogodan Peak (1,440 m a.s.l.) in Jirisan National Park and 10 samples at Seoul National University (91 m a.s.l.) between March 2022 and April 2024 to quantify OC and EC concentrations. The mean concentrations and standard deviations of OC and EC were 2.0±1.4 and 0.2±0.1 μg m-3 in Jirisan, and 3.6±0.9 and 0.3±0.2 μg m-3 in Seoul, respectively. These concentrations are lower than previously reported values across ~20 sites in South Korea, likely due to the national reduction in PM2.5 during the study period. Given these lower concentrations, the effect of EC on snowmelt might have been small in Jirisan. High OC/EC ratios (Jirisan: 22.1; Seoul: 12.5) may reflect biomass burning or the formation of secondary organic aerosols. As biomass burning is projected to increase under future climate scenarios and may alter the source and composition of carbonaceous aerosols, long-term research is essential to better understand their potential impacts on high-altitude ecosystems.

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REFERENCES

• 차지연(서울대학교 환경계획연구소) | Ji-Yeon Cha (Environmental Planning Institute, Seoul National University, Seoul 08826, Republic of Korea)
• 오능환(서울대학교 환경계획연구소, 서울대학교 환경대학원) | Neung-Hwan Oh (Environmental Planning Institute, Seoul National University, Seoul 08826, Republic of Korea, Graduate School of Environmental Studies, Seoul National University, Seoul 08826, Republic of Korea) Corresponding author
• 고현신(서울대학교 환경대학원) | Hyun Shin Koh (Graduate School of Environmental Studies, Seoul National University, Seoul 08826, Republic of Korea)
• 정진상(한국표준과학연구원 화학소재측정본부 가스측정그룹) | Jinsang Jung (Gas Metrology Group, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea)
• 옥수민(한국표준과학연구원 화학소재측정본부 가스측정그룹, 이화여자대학교 환경공학과) | Sumin Ok (Gas Metrology Group, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea, Department of Environmental Science & Engineering, Ewha Womans University, Seoul 03760, Republic of Korea)
• 이성재(서울대학교 농업생명과학대학 학술림) | Sung-Jae Lee (Seoul National University Forests, Seoul National University, Seoul 08826, Republic of Korea)
• 임광진(서울대학교 자연과학대학 지구환경과학부) | Kwang-Jin Yim (School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea)
• 안진호(서울대학교 자연과학대학 지구환경과학부) | Jinho Ahn (School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea)