https://repository.kopri.re.kr/handle/201206/14800 Wed, 29 Apr 2026 06:12:16 GMT 2026-04-29T06:12:16Z https://repository.kopri.re.kr/handle/201206/16547 Title: Imprints of sea ice, wind patterns, and atmospheric systems on summer water isotope signatures at Hercules Neve, East Antarctica Authors: Kim, Songyi; Han, Yeongcheol; Chung, Ji Woong; Ro, Seokhyun; Moon, Jangil; Hur, Soon Do; Lee, Jeonghoon Abstract: This study investigated the influence of summer climate variability on water isotopes (δ18O, δ2H, and deuterium excess[dexc]) in a Hercules Neve ice core from Antarctica. High-resolution ERA5 reanalysis data for the austral summer (DJF, 1979？2015) were used to assess the relative contributions of temperature, precipitation, wind patterns (v- and u-winds), ocean condition (sea ice concentration [SIC] and sea surface temperature [SST]), and largescale circulation system (Amundsen Sea Low [ASL] and Zonal Wave-3 [ZW3]) to isotopic variability. The results show that higher temperatures and precipitation coincide with isotopically enriched δ18O, confirming their combined role in controlling isotopic enrichment. Wind patterns also contribute meaningfully but in a more complex way: enhanced southerly winds (positive v-wind anomalies) tend to increase δ18O by transporting relatively warm, moisture-rich air from lower latitudes, whereas stronger westerly winds (positive u-wind anomalies) are associated with more depleted isotopic values, likely reflecting colder or more distant moisture sources. Additionally, the dexc exhibits a positive correlation with SIC and negative correlations with SST, providing valuable insights into moisture source processes in the study region during austral summer. Variations in the ASL and ZW3 further modulate heat and moisture transport, reinforcing their role as key atmospheric drivers of isotopic variability. Taken together, these findings suggest that the summer isotope record at Hercules Neve reflects not only local temperature changes but also the broader imprint of ocean？atmosphere interactions, including sea-ice variability and large-scale circulation patterns. This study highlights the potential of coastal Antarctic ice cores to provide improved constraints on coupled climate processes and to refine paleoclimate reconstructions for the Ross Sea region. Tue, 01 Apr 2025 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16547 2025-04-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16186 Title: Seasonal foraging behavior of Weddell seals in relation to oceanographic environmental conditions in the Ross Sea, Antarctica Authors: Chung, Hyunjae; Park, Jikang; Park, Mijin; Kim, Yejin; Chun, Unyoung; Yun, Sukyoung; Lee, Won Sang; Choi, Hyun A.; Na, Ji Sung; Yoon, Seung-Tae; Lee, Won Young Abstract: . Understanding the foraging behavior of marine animals in Antarctica is crucial for assessing their ecological significance and responses to environmental changes, such as seasonal changes in seawater or light hours. However, studying their responses to these seasonal changes remains challenging due to the difficult logistics of conducting observations, particularly during the harsh austral winter months. In this study, we investigated the influence of changes in seawater properties and light conditions on the seasonal foraging behavior of Weddell seals (Leptonychotes weddellii) in the Ross Sea, Antarctica. We affixed 64 Weddell seals with conductivity？temperature？depth tags for 3 consecutive years from 2021 to 2023 to record their locations and dive profiles, including depth, head acceleration, temperature, and salinity. We found that seals foraged more frequently in Modified Shelf Water and Ice Shelf Water than in Antarctic Surface Water. This preference could be connected to greater food availability. Seals also dove to greater depths and displayed increased activity in capturing prey during daylight hours. This behavior may correspond to the diel vertical migration of pelagic prey in response to varying light conditions. Consequently, marine fauna were confronted with distinct seasonal changes in the Antarctic environment and adjusted their foraging behaviors to respond to them. This highlights the importance of extrinsic factors in estimating their seasonal foraging behavior.; 남극의 해양 동물들의 포식 행동을 이해하는 것은 생태학적 중요성과 환경 변화(예: 계절에 따른 해수 변화나 일조 시간 변화)에 대한 반응을 평가하는 데 필수적입니다. 그러나 극한의 남극 겨울철에 관찰을 수행하는 데 있어 물류적 어려움이 커 이러한 연구는 도전 과제가 됩니다. 이 연구에서는 2021년부터 2023년까지 3년간 64마리의 웨델물범(Leptonychotes weddellii)에 전도도-온도-수심(CTD) 태그를 부착하여 남극 로스해에서 물범의 위치와 잠수 프로파일(수심, 머리 가속도, 온도, 염도 등)을 기록했습니다. 연구 결과, 웨델물범은 남극 표면수보다 변형된 대륙붕수 및 빙붕수에서 더 자주 먹이를 찾았으며, 이는 더 풍부한 먹이 자원과 관련이 있을 가능성이 있습니다. 또한, 물범은 낮 시간에 더 깊은 곳으로 잠수하며 먹이를 사냥하는 활동이 증가했는데, 이는 먹이 생물의 주야간 수직 이동과 관련될 수 있습니다. 결론적으로, 남극의 계절적 환경 변화는 해양 동물들에게 뚜렷한 영향을 미쳤으며, 물범은 이에 맞춰 포식 행동을 조정했습니다. 이는 계절적 포식 행동을 추정하는 데 외적 요인의 중요성을 강조합니다. Fri, 01 Nov 2024 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16186 2024-11-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/15121 Title: High Salinity Shelf Water production rates in Terra Nova Bay, Ross Sea from high-resolution salinity observations Authors: Una Kim Miller; Christopher J. Zappa; Arnold L. Gordon; Seung-Tae Yoon; Craig Stevens; Lee, Won Sang Abstract: High Salinity Shelf Water (HSSW) formed in the Ross Sea is a precursor to Antarctic Bottom Water(AABW), a water mass that constitutes the bottom limb of the global overturning circulation. HSSW production rates are poorly constrained, as in-situ observations are scarce. Here, we present high vertical-and-temporal-resolution salinity time series collected in austral winter 2017 from a mooring in Terra Nova Bay (TNB), one of two major sites of HSSW production in the Ross Sea. We calculate an annual-average HSSW production rate of ~0.4 Sv (106 m3 s-1), which we use to ground truth additional estimates across 2012 - 2021 made from parametrized net surface heat fluxes. We find sub seasonal and interannual variability on the order of 0.1 Sv, with a strong dependence on variability in open-water area that suggests a sensitivity of TNB HSSW production rates to changes in the local wind regime and offshore sea ice pack. Mon, 01 Jan 2024 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/15121 2024-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/15302 Title: High-Resolution Terrestrial Water Storage Estimates From GRACE and Land Surface Models Authors: Kim Jae-Seung; Seo Ki-Weon; 김병훈; Ryu Dongryeol; Chen Jianli; Wilson Clark Abstract: Terrestrial Water Storage (TWS) changes have been estimated at basin to continental scales from gravity variations using data from the Gravity Recovery and Climate Experiment (GRACE) satellites since 2002. The relatively low spatial resolution (similar to 300 km) of GRACE observations has been a main limitation in such studies. Various data processing strategies, including mascons, forward modeling, and constrained linear deconvolution (CLD), have been employed to address this limitation. Here we develop a revised CLD method to obtain a TWS estimate that combines GRACE observations with much higher spatial resolution land surface models. The revised CLD constrains model estimates to agree with GRACE TWS when smoothed. As an example, we apply the method to obtain a high spatial resolution TWS estimate in Australia. We assess the accuracy of the approach using synthetic GRACE data. Mon, 01 Jan 2024 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/15302 2024-01-01T00:00:00Z