https://repository.kopri.re.kr/handle/201206/15852 2026-04-19T16:21:24Z 2026-04-19T16:21:24Z Ahn, Seo-Hee Seo, Won Seok Kwon, Hataek Lee, Min-Hee Kim, Seong-Joong Lee, Bang Yong Park, Sang-Jong Choi, Taejin https://repository.kopri.re.kr/handle/201206/16341 2025-11-05T08:14:56Z 2024-10-01T00:00:00Z

Title: Influence of Foehn­Like Winds on Near­Surface Temperature at Jang Bogo Station, Terra Nova Bay, East Antarctica Authors: Ahn, Seo-Hee; Seo, Won Seok; Kwon, Hataek; Lee, Min-Hee; Kim, Seong-Joong; Lee, Bang Yong; Park, Sang-Jong; Choi, Taejin Abstract: The coast of Terra Nova Bay (TNB) is known as one of the intense katabatic wind confluence zones in Antarctica. Strong westerly winds with topography­specific foehn effects (foehn­like winds, FLWs) could have influenced surface temperatures in this area downwind of the Transantarctic Mountains, yet their impact remains unstudied. Jang Bogo Station (JBS) in TNB has weak winds year­round, with occasional strong winds causing significant winter temperature increases. This study aims to investigate the FLWs and their recent variability in occurrence at JBS in terms of surface temperature variability. During the strong wind events, the surface warms due to foehn effects such as adiabatic heating and vertical mixing. FLWs occur approximately 16% (10%) of the time in winter (annually). FLWs are caused by cyclones in the eastern Ross Sea. Meteorological records for 2015？2022 revealed an increased FLW frequency, particularly in winter, which has increased temperatures in recent years.

2024-10-01T00:00:00Z Kimm, Haechan Park So-Won Jun, Sang-Yoon Kug Jong-Seong https://repository.kopri.re.kr/handle/201206/16312 2025-10-31T06:09:30Z 2024-01-01T00:00:00Z

Title: How Does Plant CO2 Physiological Forcing Amplify Amazon Warming in CMIP6 Earth System Models? Authors: Kimm, Haechan; Park So-Won; Jun, Sang-Yoon; Kug Jong-Seong Abstract: The physiological response to increasing CO2 concentrations will lead to land surface warming through a redistribution of the energy balance. As the Amazon is one of the most plant-rich regions, the increase in surface temperature, caused by plant CO2 physiological forcing, is particularly large compared to other regions. In this study, we analyze the outputs of the 11 models in the Coupled Model Intercomparison Project Phase 6 to find out how CO2 physiological forcing amplifies Amazonian warming under elevated CO2 levels. With the CO2 concentration increase from 285 to 823 ppm, the Amazon temperature increased by 0.48 +/- 0.42 K as a result of plant physiological forcing. Moreover, we assess the contributions of each climate feedback to the surface warming due to physiological forcing by quantifying climate feedbacks based on radiative kernels. Lapse rate feedback and cloud feedback, analyzed as the primary contributors, accounted for 53% and 37% of Amazon warming, respectively. The warming contributions of these two feedbacks also exhibit a significant spread, which contributes to the predictive uncertainty. The surface warming due to reduced evapotranspiration is larger than the upper tropospheric warming in the Amazon, resulting in surface warming by lapse rate feedback. In addition, cloud cover in the Amazon region decreases due to the reduced evapotranspiration. Decreased cloud cover amplifies surface warming through the shortwave cloud feedback. Furthermore, differences in circulation and local convection caused by physiological effect contribute to the inter-model spread of the cloud feedback.

2024-01-01T00:00:00Z Xue Jiao Zhang Tian Park, Keyhong Yan Jinpei Yoon, Young Jun Park, Jiyeon Wang Bingbing https://repository.kopri.re.kr/handle/201206/16377 2025-11-06T08:07:42Z 2024-01-01T00:00:00Z

Title: Diverse sources and aging change the mixing state and ice nucleation properties of aerosol particles over the western Pacific and Southern Ocean Authors: Xue Jiao; Zhang Tian; Park, Keyhong; Yan Jinpei; Yoon, Young Jun; Park, Jiyeon; Wang Bingbing Abstract: Atmospheric particles can impact cloud formation and play a critical role in regulating cloud properties. However, particle characteristics at the single-particle level and their ability to act as ice-nucleating particles (INPs) over the marine atmosphere are poorly understood. In this study, we present micro-spectroscopic characterizations and ice nucleation properties of particles collected during a cruise from South Korea to Antarctica in 2019. Most of the samples were dominated by fresh sea salt, aged sea salt, and sea salt mixed with sulfate particles, with total number percentages ranging from 48 % to 99 % over the western Pacific and the Southern Ocean. The mixing-state index of the particle population ranged from 50 % to 95 % over the Northern Hemisphere and Southern Hemisphere. Multiphase processes on sea salt particles resulted in chlorine deficiency. This selective aging process made the marine particle population more externally mixed. Ice nucleation onset conditions primarily for the deposition mode were measured and the investigated particles showed diverse ice nucleation abilities. The fresh sea salt particles with organic coatings exhibited the highest ice nucleation ability at a relative humidity with respect to ice as low as 121 %. The sea salt mixed sulfate particle was enriched in INPs by a factor of 1.9. Aging processes affected both the mixing state of the particles and their ice nucleation abilities. Our analysis shows that assuming an internally mixed particle population in the marine atmosphere can lead to errors of several orders of magnitude in predicting ice nucleation rates.

2024-01-01T00:00:00Z Choi, Hyesun Kwon Hataek Kim, Seong-Joong Kim Baek-Min https://repository.kopri.re.kr/handle/201206/16417 2025-11-06T08:20:35Z 2024-01-01T00:00:00Z

Title: Warmer Antarctic summers in recent decades linked to earlier stratospheric final warming occurrences Authors: Choi, Hyesun; Kwon Hataek; Kim, Seong-Joong; Kim Baek-Min Abstract: Since the 2000s, the pause of the strong Antarctic cooling and later stratospheric final warming onset trends has been identified. Here we employ composite and congruence analysis using reanalysis and in-situ data to propose a linkage between pivotal changes in the surface temperature trends and the timing of stratospheric final warming events. In early stratospheric final warming events, the positive polar cap height anomaly developed in the stratosphere in early October, descending to the troposphere and surface in late spring and summer, resulting in high-pressure anomalies, which led to warmer surfaces in most of Antarctica. In late stratospheric final warming occurrences, opposing or weaker behaviors were observed. The trend toward earlier stratospheric final warming appears to play a considerable role in warmer summers over parts of interior Antarctica through the strengthening of the anti-cyclonic surface pressure anomaly. This could influence the regional sea-ice modulation over the Southern Ocean. Earlier occurrence of the stratospheric final warming in the Southern Hemisphere vortex over the past two decades is linked to warmer surface temperatures over interior Antarctica, according to an investigation using reanalysis data.

2024-01-01T00:00:00Z