https://repository.kopri.re.kr/handle/201206/15766 Tue, 21 Jul 2026 12:35:38 GMT 2026-07-21T12:35:38Z https://repository.kopri.re.kr/handle/201206/16461 Title: Synchronous mid-Holocene marine and terrestrial deglaciation in the Ross Sea, Antarctica Authors: Parker Rebecca L.; Riesselman Christina R.; Truax Olivia J.; Jones Richard S.; Lee, Jae Il; Lee, Min Kyung; Jacobsen Geraldine; Rosenheim Brad E.; Subt Cristina; Zawadzki Atun; Ginnane Catherine; Naeher Sebastian; Dunbar Gavin; McKay Robert M.; Levy Richard; Turnbull Jocelyn; Yoo, Kyu-Cheul Abstract: The Ross Ice Shelf buttresses ice draining from both East and West Antarctica and its collapse could accelerate the loss of inland ice sheets, rapidly raising sea level. Documenting the location, timing and rate of past glacial retreat can help reveal processes driving rapid mass loss, informing projections of ice sheet responses to a warming climate. Here, we present a record of mid-Holocene ice retreat from the southwestern Ross Sea using facies succession and paired ramped pyrolysis oxidation C-14/Pb-210 chronology. This record shows rapid ice shelf retreat from 6.9-5.4 cal kyr BP, coeval with thinning of adjacent outlet glaciers. Our findings reconcile earlier discrepancies in terrestrial and marine reconstructions, and indicate that synchronous grounding line retreat from west of Ross Island to the Siple Coast at similar to 7-6.2 cal kyr BP was likely driven by warm-water incursions, a process active in parts of Antarctica today. Mon, 01 Dec 2025 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16461 2025-12-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16601 Title: Increased Sea Ice Duration in Moubray Bay, Northwest Ross Sea Linked to Early Holocene Wind Strength Authors: Gilmer Greer; Riesselman Christina R.; Kim, Sunghan; Yoo, Kyu-Cheul; Lee, Jae Il; Lee, Min Kyung; Ginnane Catherine E.; Rosenheim Brad E.; Turnbull Jocelyn; Parker Rebecca; Jacobsen Geraldine; Mckay Robert; Levy Richard; Moy Christopher M. Abstract: Sea ice in the Ross Sea plays a critical role in the formation of dense water masses, ice sheet stability, and air-sea gas exchange, and also supports unique ecosystems. However, its seasonal and spatial variability makes it challenging to include in model simulations. To address this, new sea ice records that extend beyond the satellite era and include periods of climate change are essential. This new sediment record from Moubray Bay, northwest Ross Sea, reconstructs environmental conditions between similar to 11,300 and similar to 10,900 cal yr BP-a time of rapid retreat of marine-based ice sheets and coastal glaciers in the region. The diatom assemblage is dominated by three taxa: Fragilariopsis curta, Corethron pennatum, and Chaetoceros resting spores. Variations in their relative abundances reveal changes in wind strength, water column structure, and sea ice concentration and duration. Between similar to 11,300 and similar to 11,200 cal yr BP, environmental conditions are characterized by a stabilized water column due to fresh meltwater influx, and weaker winds, which resulted in shorter sea ice duration and reduced winter sea ice concentration. This continued after similar to 11,200 cal yr BP but stronger winds linked to deepening of Amundsen Sea Low-like circulation triggered short-term water column stratification. Sea ice concentration and duration increased after similar to 11,100 cal yr BP driven by cooling of the sea surface by stronger southerly winds. Concurrent changes in early Holocene marine and terrestrial climate records from the Ross Sea indicate a shift in atmospheric circulation during the early Holocene. Mon, 01 Dec 2025 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16601 2025-12-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16824 Title: A Study on the Trends of Deep Learning Applications in Geology Authors: Young Kyu Park; Seongjun Park; Jaewoo Jung Abstract: Deep Learning has recently become an important tool for solving problems in geology as Artificial Intelligence (AI). Geological research typically deals with large datasets and complex patterns. Deep learning algorithms applied to these challenges have substantially improved analytical accuracy and efficiency compared to traditional methods. In this study, we introduce development process of Deep Learning algorithms that can be applied in geology (problem definition and topic selection; data collection and refinement; algorithms model design and training; algorithms model optimization; deployment and interpretation). Furthermore, we introduce Deep Learning architectures and their applications in various geological fields, including mineral exploration, satellite image analysis and seismic waveform analysis. Overall, this study highlights the potential of deep learning to serve as a robust tool for understanding and predicting geological phenomena.; 최근 인공지능의 급속한 발전으로 딥러닝 기술은 지질학 분야의 문제 해결을 위한 새로운 연구 도구로부상하고 있다. 특히, 방대한 데이터를 다루며, 복잡한 패턴 분석을 필요로 하는 지질학 연구에 딥러닝 알고리즘을적용함으로써, 분석 정확도와 효율성이 크게 향상되고 있다. 본 연구에서는 딥러닝 알고리즘 개발 과정 (문제 정의및 주제 설정, 데이터 수집 및 전처리, 모델 설계 및 학습, 모델 최적화, 실용화 및 해석)을 중심으로 지질학 분야에서딥러닝 기술을 활용하여 문제를 해결하는 방안에 대해 제시하고, 최신 연구 동향을 고찰해보고자 한다. 또한, 딥러닝 모델의 대표적인 기법인 합성곱 신경망, 순환 신경망, 트랜스포머 등에 대해 소개하고, 광물 탐사 및 광상 예측, 위성영상 기반 해석, 지진파형 분석, 극지방 자료 분석 등 다양한 지질학 분야에서 활용되고 있는 일부 적용 사례를살펴보고자 한다. 이러한 기술의 발전과 더불어, 지질학에서 딥러닝의 활용이 지질 현상을 이해하고 예측하는 새로운 연구 도구로 자리매김할 수 있도록 지속적인 노력이 요구된다. Mon, 01 Dec 2025 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16824 2025-12-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16592 Title: Mid-to-late Pleistocene Depositional Environments at the Ross Sea Continental margin: Implications for Antarctic Ice Sheet Dynamics Authors: Chinmay Dash; Seong, Yeong Bae; Ajay Kumar Singh; Lee, Min Kyung; Lee, Jae Il; Yoo, Kyu-Cheul; Rhee, Hyun Hee; Yu, Byung Yong Abstract: This study investigates a sediment core (RS15-LC47) from the Ross Sea continental rise to reconstruct ice sheet dynamics and paleodepositional environments over the past 800 ka. We employed a multi-proxy approach in this study, integrating whole-core magnetic susceptibility (MS), total organic carbon (TOC), calcium carbonate (CaCO₃), biogenic silica, sedimentological features, and the isotopic ratio of authigenic beryllium ((10Be/9Be)reac). The interval between 750 and 550 ka represents an intensified glacial phase characterized by expanded ice sheets, strengthened bottom currents, and reduced marine productivity. The dominance of contourite deposits interspersed with slumped sediments suggests that the sediment deposition occurred under highly dynamic and unstable conditions driven by intensified bottom currents. The presence of poorly sorted sediments and millimetre-scale faults further indicates gravity flow deposition, likely triggered by ice-sheet advances. Low (10Be/9Be)reac ratios in this interval suggest limited scavenging in open marine settings, likely due to reduced sediment transit time to the coring site as advancing ice sheets extended toward the shelf edge. Although TOC values are highest in this interval, a high total organic carbon/nitrogen (TOC/TN) ratio and low excess Barium (Baex) suggest increased terrestrial input from the advancing ice sheets and a reduced marine productivity under intense glacial conditions in the Ross Sea. Following the Mid-Pleistocene Transition (MPT), between 550 and 250 ka, MS values remained consistently low, while (10Be/9Be)reac ratios were notably elevated, indicating relatively warmer conditions with diminished glacial influence. The TOC/TN ratios during this interval resemble those observed in the euphotic layer of the Ross Sea, with relatively higher Baex and TOC suggesting enhanced marine productivity under relatively warmer conditions between 550 and 250 ka. During the late Pleistocene (>250 ka), the depositional environment became increasingly influenced by glacial-interglacial cycles, with warmer interglacials driving enhanced productivity. During this interval, coarser grain sizes point to stronger bottom currents, while the sharp rise in (10Be/9Be)reac ratios indicates interglacial conditions associated with ice sheet retreat. The longer sediment transit from the subglacial zone to the depositional site during these warmer periods enhanced scavenging of Be isotopes in open marine settings, resulting in elevated (10Be/9Be)reac values. A positive correlation between OpalMAR, TOC%, and (10Be/9Be)reac during interglacials reflects a direct link between increased marine productivity and warmer climatic phases. Our findings emphasize how ice-sheet expansion and retreat control the depositional processes in the region. Wed, 01 Oct 2025 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16592 2025-10-01T00:00:00Z