https://repository.kopri.re.kr/handle/201206/15873 2026-03-05T10:57:27Z 2026-03-05T10:57:27Z Lee, Taewoo Cha, Hoyeon Kim, Jee Young Choi, Hyeseung Lee, Jaewon Yun, Seunggwan Lee, Yoo Kyung Lee, Jechan Jung, Ji Young Kwon, Eilhann E. https://repository.kopri.re.kr/handle/201206/16042 2025-08-22T06:27:37Z 2025-01-01T00:00:00Z

Title: Modifying carbon feedback by transforming arctic soil into biochar Authors: Lee, Taewoo; Cha, Hoyeon; Kim, Jee Young; Choi, Hyeseung; Lee, Jaewon; Yun, Seunggwan; Lee, Yoo Kyung; Lee, Jechan; Jung, Ji Young; Kwon, Eilhann E. Abstract: The escalation of global temperatures has heightened uncertainties in the Arctic, particularly regarding the potential release of greenhouse gases, such as carbon dioxide, through permafrost thawing. This phenomenon is primarily driven by positive carbon feedback, leading to 3.3 times faster Arctic warming rate than the global average. To address this challenge, this study proposes a proactive strategy for substituting Arctic underground soil with biochar to mitigate carbon dioxide emissions. Particularly, utilising carbon dioxide (CO2) as a reactive feedstock to the pyrolysis system opens up opportunities to produce the functionalized biochar for adsorbing CO2, simultaneously enhancing energy recovery from other pyrogenic products, such as syngas and biocrude. Moreover, a comprehensive techno-economic analysis allowed to determine optimized pyrolytic conditions for biochar production. Despite the necessity of high reaction temperatures, the utilisation of carbon dioxide demonstrated superior performance in terms of energy recovery and carbon dioxide mitigation. The biochars produced represent a potential of offsetting CO2 emission, with an estimated decrease rate of 51.6 Gt CO2 yr-1 by 2100 over the next 75 years. Therefore, this study introduces a strategic approach to mitigate positive carbon feedback and slow global climate change by incorporating CO2 for the biochar production.

2025-01-01T00:00:00Z Kim, Jinhyun Kim, Yongwon Nam, Sungjin Jung, Ji Young Kim, You Jin Hwang, Jeong Ho Kim, Mincheol https://repository.kopri.re.kr/handle/201206/16065 2025-08-22T08:58:33Z 2025-01-01T00:00:00Z

Title: Methane trapping in permafrost soils: a biogeochemical dataset across Alaskan boreal-Arctic gradient Authors: Kim, Jinhyun; Kim, Yongwon; Nam, Sungjin; Jung, Ji Young; Kim, You Jin; Hwang, Jeong Ho; Kim, Mincheol Abstract: Permafrost soils store vast amounts of organic carbon, and their thawing due to climate warming accelerates the release of carbon as methane and carbon dioxide, exacerbating global climate change. Understanding the distribution of greenhouse gases trapped in these soils and predicting their behavior upon thawing is essential for accurately modeling climate feedbacks. This study presents an integrated biogeochemical and microbial dataset from similar to 1.8 m deep soil cores collected across a 970 km latitudinal gradient in Alaskan permafrost regions, spanning boreal forest and Arctic tundra biomes. This dataset includes vertical profiles of trapped greenhouse gases, their stable isotope signatures, soil physicochemical properties, and the composition and abundance of key methanogenic and methanotrophic genes. These data provide critical insights into methane cycling within permafrost soils in high-latitude ecosystems and contribute to refining the parameterization of biogeochemical processes in climate models, especially in the context of accelerating permafrost thaw.

2025-01-01T00:00:00Z Kim, KwanSoo Ju, Hyeon Tae Chi Junhwa Jung, Ji Young Nam, Sungjin Park, Sang-Jong Dafflon Baptiste Lee, Joohan Kim Won-Ki https://repository.kopri.re.kr/handle/201206/16386 2025-11-06T08:09:08Z 2025-01-01T00:00:00Z

Title: Determination of Ground Subsidence Around Snow Fences in the Arctic Region Authors: Kim, KwanSoo; Ju, Hyeon Tae; Chi Junhwa; Jung, Ji Young; Nam, Sungjin; Park, Sang-Jong; Dafflon Baptiste; Lee, Joohan; Kim Won-Ki Abstract: In this study, we analyzed the effects of snow cover changes caused by snow fences (SFs) installed in 2017 in the Alaskan tundra to examine ground subsidence. Digital surface model data obtained through LiDAR-based remote sensing in 2019 and 2022, combined with a field survey in 2021, revealed approximately 0.2 m of ground subsidence around the SF. To investigate the relationship between SF-induced snow cover changes and ground subsidence, geophysical methods, electrical resistivity tomography (ERT) and ground-penetrating radar (GPR), were applied in 2023 to analyze subsurface characteristics. The increased snow cover due to the SF-enhanced insulation, delaying the penetration of winter cold into the subsurface. This delay caused subsurface temperatures to decrease more slowly, melting the upper permafrost and increasing the thickness of the active layer. ERT and GPR surveys well delineated the boundary between the active layer and permafrost, confirming that the increased snow cover thickened the active layer. This thickening led to the melting of pore ice, causing water runoff and ground compaction, which resulted in subsidence. The runoff also formed channels flowing eastward over the SF. This study highlights how changes in snow cover can influence active layer properties, leading to localized environmental changes and ground subsidence.

2025-01-01T00:00:00Z Kim, Dockyu Kim, Mincheol Woo, Sungho Nam, Sungjin Myeong, Nu Ri Kim, Eungbin Lee, Yung Mi https://repository.kopri.re.kr/handle/201206/16244 2025-10-28T09:07:45Z 2024-12-01T00:00:00Z

Title: Potential risks of bacterial plant pathogens from thawing permafrost in the Alaskan tundra Authors: Kim, Dockyu; Kim, Mincheol; Woo, Sungho; Nam, Sungjin; Myeong, Nu Ri; Kim, Eungbin; Lee, Yung Mi Abstract: Global warming-induced permafrost thawing raises concerns about the release of dormant microbes, including potentially harmful plant pathogens. However, the potential pathogenic risks associated with the thawing of permafrost remain poorly understood. Here, we conducted a 90-day soil incubation experiment at 4 °C to mimic extended permafrost thawing in Alaskan tundra soils stratified into active (A), transitional (T), and permanently frozen (P) layers. Following incubation, we examined the changes in bacterial abundance and community composition and tested the reactivation and pathogenicity of dormant plant pathogenic bacteria. Bacterial abundance, measured by colony-forming units and 16S rRNA gene copies, distinctly increased in the T and P layers after thawing. These layers also exhibited substantial shifts in bacterial community structure, with Fe-cycling taxa becoming more abundant and permafrost-dominant taxa decreasing in abundance. Notably, we isolated 52 strains with proteolytic activity, and our pathogenicity tests confirmed that Pseudomonas spp. isolates caused potato soft rot symptoms. Some Pseudomonas pathogens were undetectable in the amplicon sequencing data before thawing and emerged only in the thawed T and P layers. Our findings illustrate that permafrost acts as a reservoir of potential plant pathogens, and their resurgence upon thawing poses a potential risk to Arctic ecosystems.

2024-12-01T00:00:00Z