https://repository.kopri.re.kr/handle/201206/9422 2026-03-29T14:34:25Z 2026-03-29T14:34:25Z Kim, Seong-Joong Chung, Eui-Seok https://repository.kopri.re.kr/handle/201206/16503 2026-01-22T06:47:41Z 2025-12-01T00:00:00Z

Title: Review of Recent Polar Climate Change and Its Impact Authors: Kim, Seong-Joong; Chung, Eui-Seok Abstract: Since the Industrial Revolution, the global average temperature has risen by 1.09℃, which is an unprecedented rate over the past several millenia. Arctic warming is occurring at a faster rate than the global average by three to four times. This rapid warming in the Arctic compared to the global average is called Arctic amplification. Arctic warming is contributing to the rapid decline of sea ice and glaciers. Delayed sea ice formation in autumn and winter strengthens high and low pressure systems in mid-latitudes as well as weakening the polar vortex, that intensifies cold and heat waves in mid-latitudes. In contrast to the Arctic, Antarctica exhibits distinct temperature changes. West Antarctica had warmed rapidly and experienced a decline in sea ice and ice sheets by around 2012, whereas East Antarctica had experienced a decline in temperature and an increase in sea ice and land ice. The decrease in temperature and increase in sea ice in Antarctica are linked to declining stratospheric ozone concentrations and appear to have resulted in part from low-latitude effects. However, since the early 2010s, temperatures have increased in all areas, and sea ice has decreased, indicating a possible shift in the Antarctic climate change regime. This study examines the causes of the different responses of the Arctic and Antarctic to increasing greenhouse gases.; 산업혁명 이후 전 지구 평균 기온은 1.09℃ 상승하였으며, 이는 지난 수천 년 동안 전례가 없는 속도이다. 북극 지역의 온난화는 전 지구 평균보다 3~4배 빠르게 진행되고 있으며, 이러한 현 상을 북극 온난화 증폭이라 한다. 북극의 급격한 온난화는 해빙과 빙하의 빠른 감소에 기여하고 있 다. 가을과 겨울철 해빙 형성의 지연은 중위도 지역의 고기압과 저기압계를 강화하고 극 소용돌이를 약화시켜, 중위도 지역에서 한파와 폭염을 더욱 심화시킨다. 북극과는 대조적으로 남극에서는 상이한 기온 변화 양상이 나타나고 있다. 서남극은 약 2012년까지 급격한 온난화를 겪으며 해빙과 빙상의 감소를 경험한 반면, 동남극은 기온 하강과 함께 해빙 및 육상빙의 증가를 보였다. 남극에서의 기온 감소와 해빙 증가는 성층권 오존 농도의 감소와 관련이 있으며, 이는 부분적으로 저위도 영향에 기 인한 것으로 보인다. 그러나 2010년대 초 이후에는 모든 남극 지역에서 기온이 상승하고 해빙이 감 소하는 경향이 나타나, 남극 기후 변화 체제가 전환되고 있을 가능성을 시사한다. 본 연구는 온실가 스 증가에 대한 북극과 남극의 상이한 반응 원인을 규명하고자 한다.

2025-12-01T00:00:00Z Cuicui Shi Rui Mao Kim, Seong-Joong Dao-Yi Gong Jingfang Fan Xuechen Dong https://repository.kopri.re.kr/handle/201206/16595 2026-02-10T04:09:15Z 2025-11-01T00:00:00Z

Title: Combined Influence of IPO and AAO on Dust Events in South America Authors: Cuicui Shi; Rui Mao; Kim, Seong-Joong; Dao-Yi Gong; Jingfang Fan; Xuechen Dong Abstract: Southern South America is an important dust source to Antarctica. However, there is a lack of overall understanding of the dust event variation in recent decades in South America. Here, we analyzed variations in the dust frequency in southern South America (south of 208S) from 1986 to 2020 and its causes with large-scale climatic factors, based on observational station data and reanalysis data. During the austral spring and summer, several stations recorded an average dust frequency exceeding 15 days, with some even surpassing 20 days. The frequency of dust events in spring exhibited a strong association with large-scale climate factors. Negative phases of the interdecadal Pacific oscillation (IPO) and the Antarctic Oscillation (AAO) were more likely to lead to an increase in the dust frequency in southern South America. The negative IPO had a greater impact on the Patagonia dust (south of 408S), resulted from a decrease in the drought index under the influence of downward motion. However, the negative AAO had a greater impact on the dust in South America over 208？408S by increasing strong wind frequency and decreasing the drought index over there. On longer time scales, model outputs from the Coupled Model Intercomparison Project phase 6 (CMIP6) also confirmed the combined influence of the negative IPO and negative AAO phases on southern South American dust.

2025-11-01T00:00:00Z Kim, Ji-Soo Chung, Inchae Noh, Young-Chan Choi, Yonghan Kim, Joo-Hong Lee, Jeong-Gil Lee, Sang-Moo https://repository.kopri.re.kr/handle/201206/16575 2026-02-10T02:19:11Z 2025-11-01T00:00:00Z

Title: Optimal localization radius of data assimilation for Arctic sea ice initialization using CICE5/DART Authors: Kim, Ji-Soo; Chung, Inchae; Noh, Young-Chan; Choi, Yonghan; Kim, Joo-Hong; Lee, Jeong-Gil; Lee, Sang-Moo Abstract: In data assimilation (DA), localization, which adjusts the influence of observations on model state vectors, is an essential process for improving initial conditions. Given that the localization radius varies depending on the model and observation, sensitivity tests were conducted to identify the optimal localization radius for assimilating satellite-derived sea ice concentration and sea ice thickness into Los Alamos Sea Ice Model version 5 (CICE5) using Data Assimilation Research Testbed (DART). In all experiments, the updated Arctic sea ice initial conditions were generally improved across Pan-Arctic regions and time periods. Based on the sensitivity tests, the optimal localization radius for univariate DA was approximately 0.05 radians which is the default value in CICE5/DART. However, for multivariate DA, it was around 0.02 radians. This implies that the optimal localization condition for assimilation may vary depending on whether univariate or multivariate observations are being assimilated.

2025-11-01T00:00:00Z Chung, Eui-Seok Kim, Seong-Joong Ha, Kyung-Ja Malte Stuecker Lee, Sun-Seon Kim, Joo-Hong Jun, Sang-Yoon Tamas Bodai https://repository.kopri.re.kr/handle/201206/16578 2026-02-10T02:20:58Z 2025-11-01T00:00:00Z

Title: The role of sea ice in present and future Arctic amplification Authors: Chung, Eui-Seok; Kim, Seong-Joong; Ha, Kyung-Ja; Malte Stuecker; Lee, Sun-Seon; Kim, Joo-Hong; Jun, Sang-Yoon; Tamas Bodai Abstract: The importance of sea-ice loss on the Arctic amplification of near-surface warming remains contentious, as Arctic amplification emerges even in model experiments with disabled surface-albedo feedback. Here we show that the characteristics and underlying dynamics of Arctic amplification may change greatly in a future ice-free climate using a series of climate model experiments. Our analysis indicates that although Arctic amplification continues over the 22nd century, it weakens markedly with a less distinct seasonality in a future ice-free climate. These changes are found to occur because the strength and seasonality of Arctic amplification in the current climate are attributed mainly to a tight coupling between cold-season lapse-rate feedback and sunlit-season surface-albedo feedback. The substantial differences in the characteristics of simulated Arctic amplification between the current and future ice-free climate therefore suggest that the presence of Arctic sea ice is an essential component of the current Arctic amplification regime.

2025-11-01T00:00:00Z