https://repository.kopri.re.kr/handle/201206/11608 Tue, 07 Apr 2026 16:02:24 GMT 2026-04-07T16:02:24Z https://repository.kopri.re.kr/handle/201206/16164 Title: Antarctic meltwater-induced dynamical changes in phytoplankton in the Southern Ocean Authors: Oh, Ji-Hoon; Noh, Kyung Min; Lim, Hyung-Gyu; Jin, Emilia Kyung; Jun, Sang-Yoon; Kug, Jong-Seong Abstract: It has been suggested that the freshwater flux due to the recent melting of the Antarctic ice-sheet/shelf will suppress ventilation in the Southern Ocean. In this study, we performed idealized earth system simulations to examine the impacts of Antarctic meltwater on surface phytoplankton biomass in the Antarctic Ocean. The enhanced stratification due to the meltwater leads to a decrease in the surface nitrate concentration but an increase in the surface dissolved iron concentration. These changes are associated with the reduced upwelling of nitrate-rich deep water and the trapped iron exported from the terrestrial sediment. Because of the limited iron availability in the Southern Ocean, the trapped iron in surface water enhances the chlorophyll concentration in the open ocean. However, in the marginal sea along the Antarctic coastline where the iron is relatively sufficient, a nitrate reduction induces a chlorophyll decrease, indicating a regime shift from iron-limited to nitrate-limited conditions. Sat, 01 Jan 2022 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16164 2022-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/13581 Title: An open access dataset for developing automated detectors of Antarctic baleen whale sounds and performance evaluation of two commonly used detectors Authors: Miller, Brian S.; Balcazar, Naysa; Nieukirk, Sharon; Leroy, Emmanuelle C.; Aulich, Meghan; Shabangu, Fannie W.; Dziak, Robert P.; Lee, Won Sang; Hong, Jong Kuk Abstract: Since 2001, hundreds of thousands of hours of underwater acoustic recordings have been made throughout the Southern Ocean south of 60° S. Detailed analysis of the occurrence of marine mammal sounds in these circumpolar recordings could provide novel insights into their ecology, but manual inspection of the entirety of all recordings would be prohibitively time consuming and expensive. Automated signal processing methods have now developed to the point that they can be applied to these data in a cost-effective manner. However training and evaluating the efficacy of these automated signal processing methods still requires a representative annotated library of sounds to identify the true presence and absence of different sound types. This work presents such a library of annotated recordings for the purpose of training and evaluating automated detectors of Antarctic blue and fin whale calls. Creation of the library has focused on the annotation of a representative sample of recordings to ensure that automated algorithms can be developed and tested across a broad range of instruments, locations, environmental conditions, and years. To demonstrate the utility of the library, we characterise the performance of two automated detection algorithms that have been commonly used to detect stereotyped calls of blue and fin whales. The availability of this library will facilitate development of improved detectors for the acoustic presence of Southern Ocean blue and fin whales. It can also be expanded upon to facilitate standardization of subsequent analysis of spatiotemporal trends in call-density of these circumpolar species. Description: Group Author : IWC-SORP SOOS Acoustic Trends Work (IWC-SORP SOOS Acoustic Trends Work) Tue, 12 Jan 2021 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/13581 2021-01-12T00:00:00Z https://repository.kopri.re.kr/handle/201206/11805 Title: Impact of Antarctic Meltwater Forcing on East Asian Climate Under Greenhouse Warming Authors: Oh, Ji­Hoon; Park, Wonsun; Lim, Hyung­Gyu; Noh, Kyung Min; Jin, Emilia Kyung; Kug, Jong­Seong Abstract: In recent decades, Antarctic ice sheet/shelf melting has been accelerated, releasing freshwater into the Southern Ocean. It has been suggested that the meltwater flux could lead to cooling in the Southern Hemisphere, which would retard global warming and further induce a northward shift of the Intertropical Convergence Zone (ITCZ). In this study, we use experimental ensemble climate simulations to show that Antarctic meltwater forcing has distinct regional climate impacts over the globe, leading in particular to regional warming in East Asia, which offsets the global cooling effect by the meltwater forcing. It is suggested that Antarctic meltwater forcing leads to a negative precipitation anomaly in the Western North Pacific (WNP) via cooling in the tropics and the northward shift of the ITCZ. This suppressed convection in WNP induces an anticyclonic flow over the North Pacific, which leads to regional warming in East Asia. This hypothesis is supported by analyses of interensemble spread and long­term control simulations. Sun, 01 Nov 2020 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/11805 2020-11-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/11874 Title: Dynamical response of atmospheric circulation to below-normal East Sea sea surface temperatures associated with heavy snowfall in eastern Korea Authors: Kim, Taekyun; Kim, Yoonjae; Moon, Jae-Hong; Jin, Emilia Kyung Abstract: Prior studies have shown that above-normal sea surface temperatures (SSTs) enhance snowfall over Korea. Here, we show that heavy snow is also associated with below-normal East Sea SSTs, and we investigate the dynamical response of the atmosphere to this surface condition using observations and numerical modeling. The results indicate that anomalous southeasterly/easterly winds are induced by heavy snowfall-related cold SST anomalies, and consequently, the moisture flux is converged. The existence of the southeasterly winds and the accompanied moisture flux convergence appear to be instrumental in producing the heavy snowfall events. The anomalous southeasterly/easterly winds associated with heavy snowfall-related cold SST anomalies reduce the climatological northwesterly/westerly winds, leading to relatively warm and wet conditions over the east coast of Korea that are favorable for forming and intensifying snowfall events in the region. Wed, 01 Jul 2020 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/11874 2020-07-01T00:00:00Z