A5089805612- Cryospheric studies and observations
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Climate variability and models
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Polar Research and Ecology
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Oceanographic and Atmospheric Processes
- Plant Water Relations and Carbon Dynamics
- Geophysics and Gravity Measurements
- Icing and De-icing Technologies
- Hepatitis B Virus Studies
- Hepatitis C virus research
- Marine Biology and Ecology Research
- Marine and coastal ecosystems
- Gallbladder and Bile Duct Disorders
- Electrical Fault Detection and Protection
- Esophageal and GI Pathology
- Aeolian processes and effects
- Hepatocellular Carcinoma Treatment and Prognosis
Korea Polar Research Institute
2014-2025
Bundang Jesaeng Hospital
2009-2024
The Ohio State University
2021
Seoul National University
2009-2012
Korea University
2012
GeneMatrix (South Korea)
2011
Pusan National University
2010
Abstract The regional variability in tundra and boreal carbon dioxide (CO 2 ) fluxes can be high, complicating efforts to quantify sink‐source patterns across the entire region. Statistical models are increasingly used predict (i.e., upscale) CO large spatial domains, but reliability of different modeling techniques, each with specifications assumptions, has not been assessed detail. Here, we compile eddy covariance chamber measurements annual growing season gross primary productivity (GPP),...
Abstract The Antarctic Peninsula (AP) experienced a new extreme warm event and record-high surface melt in February 2022, rivaling the recent temperature records from 2015 2020, contributing to alarming series of events over this region showing stronger warming compared rest Antarctica. Here, drivers impacts are analyzed detail using range observational modeling data. northern/northwestern AP was directly impacted by an intense atmospheric river (AR) attaining category 3 on AR scale, which...
Abstract The Arctic–Boreal Zone is rapidly warming, impacting its large soil carbon stocks. Here we use a new compilation of terrestrial ecosystem CO 2 fluxes, geospatial datasets and random forest models to show that although the was overall an increasing sink from 2001 2020 (mean ± standard deviation in net exchange, −548 140 Tg C yr −1 ; trend, −14 P < 0.001), more than 30% region source. Tundra regions may have already started function on average as sources, demonstrating shift...
Abstract. Past efforts to synthesize and quantify the magnitude change in carbon dioxide (CO2) fluxes terrestrial ecosystems across rapidly warming Arctic–boreal zone (ABZ) have provided valuable information but were limited their geographical temporal coverage. Furthermore, these been based on data aggregated over varying time periods, often with only minimal site ancillary data, thus limiting potential be used large-scale budget assessments. To bridge gaps, we developed a standardized...
Abstract Tundra and boreal ecosystems encompass the northern circumpolar permafrost region are experiencing rapid environmental change with important implications for global carbon (C) budget. We analysed multi-decadal time series containing 302 annual estimates of dioxide (CO 2 ) flux across 70 non-permafrost ecosystems, 672 summer CO 181 ecosystems. find an increase in sink but not despite similar increases uptake. Thus, recent non-growing-season losses have substantially impacted balance...
Abstract The Year of Polar Prediction in the Southern Hemisphere (YOPP-SH) held seven targeted observing periods (TOPs) during 2022 austral winter to enhance atmospheric predictability over Ocean and Antarctica. TOPs 5–10-day duration each featured release additional radiosonde balloons, more than doubling routine sounding program at 24 participating stations run by 14 nations, together with process-oriented observations selected sites. These extra data are evaluated for their impact on...
Abstract. We report on one year of high-precision direct hourly radon observations at King Sejong Station (King George Island) beginning in February 2013. Findings are compared with historic and ongoing measurements from other Antarctic sites. Monthly median concentrations reduced 72 mBq m−3 late-summer to 44 late winter early spring. 10th percentiles, ranging 29 49 m−3, were typical oceanic baseline values. Diurnal cycles rarely evident local influences minor, consistent regional flux...
Abstract The Year of Polar Prediction in the Southern Hemisphere (YOPP-SH) had a special observing period (SOP) that ran from 16 November 2018 to 15 February 2019, chosen span austral warm season months greatest operational activity Antarctic. Some 2,200 additional radiosondes were launched during 3-month SOP, roughly doubling routine program, and network drifting buoys Ocean was enhanced. An evaluation global model forecasts SOP using its data has confirmed extratropical forecast skill lags...
Nasal polyposis is a multi-factorial disease associated with chronic inflammatory condition of the paranasal sinuses. Myofibroblast differentiation and extracellular matrix (ECM) accumulation are involved in pathogenesis nasal polyposis.The aim this study was to effect trichostatin A (TSA), histone deacetylase (HDAC) inhibitor, on transforming growth factor (TGF)-β1-induced myofibroblast ECM polyp-derived fibroblasts (NPDFs).Nasal were isolated from polyps patients who have rhinosinusitis...
Dimethyl sulfide (DMS) produced by marine algae represents the largest natural emission of sulfur to atmosphere. The oxidation DMS is a key process affecting new particle formation that contributes radiative forcing Earth. In this study, atmospheric and its major products (methanesulfonic acid, MSA; non-sea-salt sulfate, nss-SO42–) size distributions were measured at King Sejong station located in Antarctic Peninsula during austral spring–summer period 2018–2020. observatory was surrounded...
Abstract In this study, we analyzed the effects of snow cover changes caused by fences (SFs) installed in 2017 Alaskan tundra to examine ground subsidence. Digital surface model data obtained through LiDAR-based remote sensing 2019 and 2022, combined with a field survey 2021, revealed approximately 0.2 m subsidence around SF. To investigate relationship between SF-induced subsidence, geophysical methods, electrical resistivity tomography (ERT) ground-penetrating radar (GPR), were applied...
Atmospheric rivers (ARs), increasingly recognized for their substantial influence on polar regions, are characterized as long, narrow corridors of intense moisture transport that play a crucial role in the redistribution heat and water vapor toward higher latitudes. These systems profoundly affect precipitation regimes, surface melt dynamics, and, consequently, mass balance Antarctica (Wille et al., 2021). Additionally, ARs interact with oceanic processes, influencing wave activity, sea...
Atmospheric rivers (AR) are long, narrow, transient corridors of intense atmospheric moisture transport affecting many regions around the world including Antarctica, where they play an important role in surface mass and energy balance. Over Antarctic Peninsula (AP), one most rapidly warming regions, ARs have been increasing frequency intensity causing major heatwaves, anomalous precipitation melt [1,2]. The impact would not be as without global [3] thus it is urgent to understand processes...
This study investigates the characteristics and mechanisms of strong winds at Jang Bogo Station (74&#176;37'S, 164&#176;12'E) in Terra Nova Bay, East Antarctica, using 8 years (2015-2022) Automated Synoptic Observation System (ASOS) data ERA5 reanalysis data. Analysis wind patterns reveals two distinct regimes: southwesterly (180-270&#176;) northwesterly (270-360&#176;) winds. Strong events show clear seasonal variation, with peak frequencies occurring March July. analysis...
Abstract Mosses are vital components of ecosystems, exhibiting remarkable adaptability across diverse habitats from deserts to polar ice caps. Sanionia uncinata (Hedw.) Loeske, a dominant Antarctic moss survives extreme environmental condition through perennial lifecycles involving growth and dormancy alternation. This study explores genetic controls molecular mechanisms enabling S. cope with seasonality the environment. We analysed seasonal transcriptome dynamics collected monthly February...
Abstract The Norwegian young sea ICE (N‐ICE2015) expedition was designed to investigate the atmosphere‐snow‐ice‐ocean interactions in and thin ice regime north of Svalbard. Radiosondes were launched twice daily during from January June 2015. Here we use these upper air measurements study multiple cyclonic events observed N‐ICE2015 with respect changes vertical thermodynamic structure, moisture content, boundary layer characteristics. We provide statistics temperature inversion...
Ten-year (2004–2013) observations of cloud and surface shortwave (SW) longwave (LW) fluxes at Ny-Ålesund were analysed to investigate monthly variations in cloudiness their impacts on the LW radiation budget near-surface temperature (Ts). The fraction (CF) showed distinct variations, high summer (0.90) lower winter (0.79). downward SW flux increased from March a peak (~200 W m−2) June. In contrast, (LWD) ~200 m−2 February ~300 July. Both LWD upward (LWU) difference during as lowest base...
Abstract The ongoing disproportionate increases in temperature and precipitation over the Arctic region may greatly alter latitudinal gradients greenup snowmelt timings as well associated carbon dynamics of tundra ecosystems. Here we use remotely-sensed ground-based datasets model results embedding timing phenology at seven flux tower sites Alaska during 2001–2018, showing that response to early or delayed varies depending upon local climatic limits. Increases net ecosystem productivity...
Abstract. The tundra ecosystem is quite vulnerable to drastic climate change in the Arctic, and quantification of carbon dynamics significant importance regarding thawing permafrost, changes snow-covered period snow shrub community extent, decline sea ice Arctic. Here, CO2 efflux measurements using a manual chamber system within 40 m × (5 interval; 81 total points) plot were conducted dominant vegetation on Seward Peninsula Alaska, during growing seasons 2011 2012, for assessment driving...
Soil is a significant source of CO2 emission to the atmosphere, and this process accelerating at high latitudes due rapidly changing climates. To investigate sensitivity soil emissions temporal frequency variations in climate, we performed continuous monitoring efflux using Forced Diffusion (FD) chambers half-hour intervals, across three representative Alaskan cover types with underlying permafrost. These sites were established during growing season 2015, on Seward Peninsula western Alaska....
Quantifying the temporal variability in phytoplankton productivity is essential for improving our understanding of carbon (C) and nitrogen (N) dynamics energy flows natural aquatic ecosystems. Samples were collected at three-day intervals from December 2018 to January 2019 fixed station Marian Cove, Antarctica determine C N (NO 3 - NH 4 + ) uptake by phytoplankton. Considerable fluctuations total productivities observed, which led dynamic changes communities a stronger coupling between...