https://repository.kopri.re.kr/handle/201206/15390 2026-04-05T21:24:46Z https://repository.kopri.re.kr/handle/201206/15399 Title: Land-Ice/Ocean Network Exploration with Semiautonomous Systems: Thwaites Glacier (LIONESS/TG) Authors: Lee, Won Sang 2023-07-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/15408 Title: Understanding the delayed Amundsen Sea low response to ENSO Authors: 이현주; Jin, Emilia Kyung Abstract: Although the El Nino-Southern Oscillation (ENSO) affects West Antarctica via teleconnection, it is delayed by a season, because the Amundsen Sea Low (ASL) anomaly in response to the ENSO is the strongest in May. However, the process and mechanism of the delay has not been fully elucidated yet. In this study, we examined the formation of the ENSO-driven teleconnection in each month from January to May by analyzing the kinetic energy conversion and Rossby wave propagation. The flow perturbed by the ENSO gains energy from the basic state by energy conversion, but the perturbation does not reach the high latitudes until April. In May, although the ENSO intensity becomes weak, the development of the subtropical jet induces waves to propagate further south, resulting in the anticyclonic circulation anomaly over the ASL region. Numerical experiments that account for the decay of the ENSO forcing and the monthly varying basic state also indicate that the formation of the teleconnection is the strongest in May. The results reveal that the configuration of the basic state is crucial for the teleconnection in response to the ENSO to reach West Antarctica. 2023-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/15409 Title: Remote Influences of ENSO and IOD on the Interannual Variability of the West Antarctic Sea Ice Authors: Kim Jihae; Kang Daehyun; Lee Myong-In; Jin, Emilia Kyung; Kug Jong-Seong; Lee, Won Sang Abstract: West Antarctica exhibits a pronounced sea ice variability in interannual timescale, and 20%-30% of the total variance can be explained by the El Nino-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) during austral spring. The sea ice variation is primarily linked with anomalous atmospheric circulation in the Amundsen-Bellingshausen Sea (ABS) that modulates poleward atmospheric temperature advection and radiative forcing. With a co-varying relationship between ENSO and IOD, isolating their remote impacts on Antarctica has been limited in observations. An idealized experiment using the atmospheric model with a dry dynamical core suggests that the anticyclonic circulation anomaly in the ABS is primarily contributed by the ENSO in the Pacific Ocean, while the contribution of the IOD in the Indian Ocean is only one-third large. This study implies that atmospheric teleconnection through the southern Pacific Ocean is crucial for understanding the West Antarctic sea ice concentration variability.Plain Language Summary Antarctic sea ice, which affects the Earth's climate system, has gained considerable attention in recent years. Previous studies have shown that the El Nino-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) in the tropics affect the sea ice variation in West Antarctica through atmospheric teleconnections at interannual timescale. Unfortunately, due to the high positive correlation between these two climate modes, it is unclear how each phenomenon contributes to the West Antarctic sea ice variation. Therefore, this study investigates the underlying mechanisms related to the sea ice changes caused by ENSO and IOD during austral spring and quantifies the effect of each phenomenon on the West Antarctic sea ice through an idealized model experiment. It is found that the ENSO and the IOD account for 20%-30% of sea ice variance during austral spring, which is primarily contributed by the dynamic and thermodynamic mechanisms associated with atmospheric circulation in the Amundsen-Bellingshausen Sea (ABS). In addition, we confirm through the model experiments that the effect of ENSO in the Pacific Ocean on the atmospheric circulation patterns of ABS is about three times stronger than that of IOD in the Indian Ocean. 2023-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/15406 Title: Antarctic ice mass change (2003-2016) jointly estimated by satellite gravimetry and altimetry Authors: 김병훈; 서기원; Lee, Choon-Ki; 김재승; Jianli Chen; Clark R. Wilson Abstract: Accurate estimation of ongoing Antarctic ice mass change is important to predict future ice mass loss and subsequent sea-level rise. Over the past two decades, Antarctic ice mass changes have been observed by the Gravity Recovery and Climate Experiment (GRACE) gravity mission, but the low spatial resolution of GRACE has limited understanding of glacial-scale contributions. In this study, we combine GRACE and altimetry data to obtain mass change estimates with greatly improved spatial resolution. Combined estimates are obtained by a constrained linear deconvolution (CLD) algorithm used in a previous GRACE study. Satellite altimetry observations are introduced as an a priori, and resulting estimates retain the high spatial resolution of satellite altimetry, but when smoothed agree with low resolution GRACE data. These glacial-scale estimates also agree with ice budget calculations using the Input-Output method. 2022-01-01T00:00:00Z