https://repository.kopri.re.kr/handle/201206/15718 2026-03-05T08:33:35Z 2026-03-05T08:33:35Z Lee, Hyun-Ju Jin, Emilia Kyung Kim, Byeong-Hoon Lee, Won Sang https://repository.kopri.re.kr/handle/201206/16561 2026-02-09T06:50:46Z 2025-11-01T00:00:00Z

Title: Disappearance of the El Nino-driven surface mass gain in West Antarctica under future climate change Authors: Lee, Hyun-Ju; Jin, Emilia Kyung; Kim, Byeong-Hoon; Lee, Won Sang Abstract: Strong El Nino events drive substantial snowfall in West Antarctica, including the Antarctic Peninsula, by weakening the Amundsen Sea Low (ASL) through atmospheric teleconnections, increasing surface mass balance and mitigating ice mass loss’s contribution to sea-level rise. However, we find that CMIP6 projections show a diminishing El Nino-driven precipitation effect as global warming intensifies. The El Nino-associated precipitation anomaly is projected to weaken in SSP3-7.0 and SSP5-8.5, becoming indistinguishable from zero by the late 21st century in the latter. This transition is caused by a strengthened polar jet, linked to a positive Southern Annular Mode (SAM) trend in a warmer climate, which extends the wavelength of Rossby waves. As a result, the ASL anomaly eventually migrates eastward and equatorward, reducing water vapor transport into West Antarctica’s interior. These findings indicate that El Nino-driven precipitation disappears in a high-emission future, eliminating one of the buffering mechanisms that help counteract sea-level rise.

2025-11-01T00:00:00Z Kim, Taekyun Choo, Sung-Ho Moon, Jae-Hong Jin, Emilia Kyung Kim, Daehyuk Cha, Hyeonsoo https://repository.kopri.re.kr/handle/201206/16598 2026-02-10T04:14:03Z 2025-10-01T00:00:00Z

Title: 로스해 대륙붕 수온의 역전과 2010년대 중반 이후 남극 해빙의 지속적인 감소와의 연관성 Authors: Kim, Taekyun; Choo, Sung-Ho; Moon, Jae-Hong; Jin, Emilia Kyung; Kim, Daehyuk; Cha, Hyeonsoo Abstract: Since the mid-2010s, a sharp rebound in dense shelf water (DSW) salinity has been observed in the Ross Sea, coinciding with a persistent decline in sea ice around Antarctica. Despite extensive scientific study and significant attention given to these two phenomena due to their potential influence on Earth’s changing climate, a physical link between them has yet to be established. Here, by examining atmospheric circulation in response to shifts in major climate variability modes before and after these dramatic changes, we showed that a combination of large-scale circulation patterns drove both the decline in Antarctic sea ice and the increase in Ross Sea DSW salinity. After the mid-2010s, climate-driven atmospheric circulation generated anomalous northerly winds across much of the high-latitude Southern Ocean. However, the Ross Sea sector uniquely experienced strengthened southerly flow of cold continental air. Consequently, this process led to enhanced sea ice loss around Antarctica through warmer air advection from the north, yet simultaneously, expanded the Ross Sea polynyas, enhancing sea ice formation and contributing to increased Ross Sea DSW salinity. Our findings, therefore, establish a robust linkage between these two Southern Ocean transitions, highlighting their interdependence driven by large-scale climate modes.

2025-10-01T00:00:00Z Christian T. Wild Reinhard Drews Niklas Neckel Lee, Joohan Kim, Sihyung Han, Hyangsun Lee, Won Sang Veit Helm Sebastian Harry Reid Rosier Oliver J. Marsh Wlfgang Rack https://repository.kopri.re.kr/handle/201206/16608 2026-02-10T04:25:08Z 2025-10-01T00:00:00Z

Title: Monitoring shear-zone weakening in East Antarctic outlet glaciers through differential InSAR measurements Authors: Christian T. Wild; Reinhard Drews; Niklas Neckel; Lee, Joohan; Kim, Sihyung; Han, Hyangsun; Lee, Won Sang; Veit Helm; Sebastian Harry Reid Rosier; Oliver J. Marsh; Wlfgang Rack Abstract: The stability of the Antarctic Ice Sheet depends on ice flux into the ocean through major outlet glaciers, which is resisted by shear stresses in the lateral shear margins, both on grounded ice and on floating ice shelves. Within the tidal-flexure zone, where the ice sheet transitions from fully grounded to freely floating, ocean tides lead to a characteristic flexural pattern, which can be detected by radar satellites in differential interferograms. Here, we investigate how spatially heterogeneous elastic ice-shelf properties in the shear zones affect tidal flexure and whether a corresponding signature can be detected in satellite observations. We use the Young’s modulus (which, among others, depends on ice temperature and/or ice-crystal orientation fabric and damage) as a bulk tuning variable for changing ice stiffness across shear zones and show that this leads to centimeter-scale deviations in vertical displacement, compared with a homogeneous elastic flexure model. Using the tidal-flexure zone of Priestley Glacier as an example, we compare homogeneous and heterogeneous flexure-model predictions with observations from 31 differential interferograms. After adjusting the local tide model and validating it with in situ GPS data, we find that a 5-fold reduction of the Young’s modulus in the shear zone, i.e., an effective shear-zone weakening, reduces the root-mean-square error of predicted and observed vertical displacement by 33 % within the central part of the ice shelf. This suggests that satellite interferometry can detect changing ice stiffness across shear zones, with the potential to inform ice-flow models about the often unknown spatial variability in ice-shelf properties along the grounding zone.

2025-10-01T00:00:00Z Shenjie Zhou Pierre Dutrieux Claudia F. Giulivi Adrian Jenkins Alessandro Silvano Christopher Auckland E. Povl Abrahamsen Michael Meredith Irena Va？kova Keith Nicholls Peter E. D. Davis Svein Østerhus Arnold L. Gordon Christopher J. Zappa Tiago S. Dotto Ted Scambos Kathryn L. Gunn Stephen R. Rintoul Shigeru Aoki Craig Stevens Chengyan Liu Yun, Sukyoung Kim, Tae-Wan Lee, Won Sang Markus Janout Tore Hattermann Julius Lauber Elin Darelius Anna Wahlin Leo Middleton Pasquale Castagno Giorgio Budillon Karen J. Heywood Jennifer Graham Stephen Dye Daisuke Hirano Una Kim Miller https://repository.kopri.re.kr/handle/201206/16587 2026-02-10T03:51:11Z 2025-10-01T00:00:00Z

Title: The OCEAN ICE mooring compilation: a standardised, pan-Antarctic database of ocean hydrography and current time series Authors: Shenjie Zhou; Pierre Dutrieux; Claudia F. Giulivi; Adrian Jenkins; Alessandro Silvano; Christopher Auckland; E. Povl Abrahamsen; Michael Meredith; Irena Va？kova; Keith Nicholls; Peter E. D. Davis; Svein Østerhus; Arnold L. Gordon; Christopher J. Zappa; Tiago S. Dotto; Ted Scambos; Kathryn L. Gunn; Stephen R. Rintoul; Shigeru Aoki; Craig Stevens; Chengyan Liu; Yun, Sukyoung; Kim, Tae-Wan; Lee, Won Sang; Markus Janout; Tore Hattermann; Julius Lauber; Elin Darelius; Anna Wahlin; Leo Middleton; Pasquale Castagno; Giorgio Budillon; Karen J. Heywood; Jennifer Graham; Stephen Dye; Daisuke Hirano; Una Kim Miller Abstract: Continuous moored time series of temperature, salinity, pressure and current speed and direction are of great importance for understanding the continental shelf and under-ice-shelf dynamics and thermodynamics that govern water mass transformations and ice melting in and around Antarctic marginal seas. In these regions, icebergs and sea ice make ship-based mooring deployment and recovery challenging. Nevertheless, over decades, expeditions around the fringe of Antarctica sporadically deployed and recovered hundreds of moored instruments, including those facilitated through ice shelves boreholes. These datasets tend to be archived in a wide range of data centres, with, to our knowledge, no clear format standardisation. As a result, systematic analysis of historical mooring time series in the marginal seas is often challenging. Here we present the first version of a standardised pan-Antarctic moored hydrography and current time series compilation, with broad international contributions from data centres, research institutes and individual data owners. The mooring records in this compilation span over five decades, from the 1970s to the 2020s, providing an opportunity for a systematic study of the pan-Antarctic water mass transport and shelf connectivity. As a demonstration of the utility of this compilation, we present spectral analysis of the compiled current velocity time series, which unsurprisingly shows the dominating presence of tidal variability within most records. This component of the variability is fitted using multi-linear regression to tidal frequencies, and the tidal fit is removed from the original time series to leave de-tided variability. Given the limited record durations to months to years, de-tided variability is dominated by synoptic (3？10？d period), intraseasonal (10？80？d) and seasonal (∼6 months？1 year) signals. The spatial distribution of the kinetic energy integrated within frequency bands is presented and discussed within respective regional contexts, and future avenues of research are proposed. This data compilation is assembled under the endorsement of Ocean-Cryosphere Exchanges in ANtarctica: Impacts on Climate and the Earth System (OCEAN ICE) project (https://ocean-ice.eu/, last access: 23 October 2025) funded by the European Commission and UK Research and Innovation. It is available and regularly updated in NetCDF format with the SEANOE database at https://doi.org/10.17882/99922 (Zhou et al., 2024a).

2025-10-01T00:00:00Z