https://repository.kopri.re.kr/handle/201206/15863 2026-04-21T05:30:41Z https://repository.kopri.re.kr/handle/201206/16282 Title: Advances in Machine Learning Techniques Can Assist Across a Variety of Stages in Sea Ice Applications Authors: Clare Eayrs; Lee, Won Sang; Jin, Emilia Kyung; Lemieux Jean-Francois; Massonnet Francois; Vancoppenolle Martin; Zampieri Lorenzo; Bennetts Luke G.; Blockley Ed; Chung, Eui-Seok; Fraser Alexander D.; Ham Yoo-geun; Im Jungho; Kim Baek-min; Kim, Beong-Hoon; Kim Jinsuk; Kim, Joo-Hong; Kim, Seong-Joong; Kim, Seung Hee; Korosov Anton; Lee, Choon-Ki; Lee Donghyuck; Lee, yun-Ju; Lee Jeong-Gil; Lee, Jiyeon; Na Jisung; Park, In-Woo; Park Jikang; Wang Xianwei; Xu Shiming; Yun, Sukyoung 2024-10-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16345 Title: Partitioning the drivers of Antarctic glacier mass balance (2003-2020) using satellite observations and a regional climate model Authors: Kim, Byeong-Hoon; Seo Ki- Weon; Lee, Choon-Ki; Kim Jae- Seung; Lee, Won Sang; Jin, Emilia Kyung; van den Broeke Michiel Abstract: We investigate the mass changes of Antarctic glaciers from 2003 to 2020, partitioning them into the contributions of surface mass balance (SMB) and ice discharge, using high- resolution ice mass change estimates derived from the combination of two different types of satellite observations (gravimetry and altimetry) and outputs from a regional climate model. Our analysis indicates that changes in ice discharge have played a dominant role in ongoing ice mass trends and their accelerations, especially in glaciers near the Amundsen and Bellingshausen Seas in West Antarctica. In particular, mass losses of the Thwaites and Pine Island Glaciers have been mostly (>90%) controlled by ice discharge, while the contribution of SMB has been relatively minor. In East Antarctica, SMB accounts for significant portions (>50%) of ice mass imbalances of glaciers in e.g., Dronning Maud Land and Wilkes Land. Ice discharge has also played a notable role in overall mass gain in the region. While our ice discharge estimates agree well with previous estimates from satellite imagery in West Antarctica, notable differences are found in glaciers of East Antarctica and the Antarctic Peninsula. This highlights the need for more observations and improved numerical models to refine these estimates. 2024-08-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16204 Title: The dominant influence of indian ocean dipole-like ocean warming on decreased precipitation over eastern East Antarctica Authors: Lee, Hyun-Ju; Jin, Emilia Kyung Abstract: East Antarctica is undergoing a noticeable decrease in precipitation, significantly impacting ice mass loss. However, there is a lack of research on the underlying factors behind this change. This study highlights that on an interannual timescale, the precipitation variations in Eastern East Antarctica (EEA) are predominantly influenced by the Indian Ocean Dipole mode (IOD) compared to other climate variabilities like the Southern Annular Mode (SAM), El Ni & ntilde;o-Southern Oscillation (ENSO), and north Atlantic variability. Through trend analysis of each climate variability, we confirmed that the observed decrease in EEA precipitation can be attributed to positive IOD-like ocean warming. A positive SAM trend also contributed to specific Wilkes Land and Queen Mary Land regions. Despite these influence on long-term trend, the relationship between IOD and EEA precipitation exhibits sporadic changes on interdecadal timescales. Notably, the apparent negative correlation between the two declined to insignificance in the early 2000s, only to re-establish a significant negative correlation by the early 2010s. The primary driver of this change is the inconsistent propagation of waves originating from the Indian Ocean. During periods of high correlation, these waves propagate southeastward, inducing a robust low-pressure anomaly near Victoria Land, ultimately leading to decreased EEA precipitation. However, during periods of low correlation, the waves move eastward and fail to alter the circulation anomalies near East Antarctica. 2024-04-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16313 Title: A new understanding of the causes of future change in El Nino teleconnection Authors: Lee, Hyun-Ju; Jin, Emilia Kyung Abstract: Understanding and elucidating future changes in El Nino teleconnection is crucial because of the influence of El Nino on the globe via teleconnection. Existing climate models have consistently projected an eastward and poleward shift in El Nino teleconnection in the future, but the causes and dynamical processes of this shift have been poorly explained. Particularly, no study has examined the characteristic changes in the barotropic Rossby waves that form the teleconnection. This study investigates dynamic processes by analyzing the wavelength of the Rossby waves through spectral analysis, measuring the distance between circulation anomalies, and exploring the dispersion relationship of the barotropic Rossby waves. The results revealed that the wavelength of waves forming the teleconnection is expected to increase in warmer climate with an increase in the proportion of zonal-wavenumber-2 wave. Because changes in the mean state, including the strengthening of the westerly in the high-emission scenario, alter the frequencies of waves according to their zonal wavenumbers, this process is more notably manifested in the Southern Hemisphere, where the inter-model spread of the mean state is smaller, than in the Northern Hemisphere. Consequently, this will result in a shift in the position of El Nino's influence on the high latitudes of both Hemispheres. Specifically, in the Southern Hemisphere, it is anticipated that ocean warming in the seas in front of West Antartica and moisture transport towards Antarctica, induced by El Nino, will shift eastward in the high-emission scenario compared to its conventional position. 2024-01-01T00:00:00Z