A5100743635- Marine and coastal ecosystems
- Arctic and Antarctic ice dynamics
- Atmospheric chemistry and aerosols
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Microbial Community Ecology and Physiology
- Polar Research and Ecology
- Cryospheric studies and observations
- Atmospheric and Environmental Gas Dynamics
- Marine Biology and Ecology Research
- Atmospheric Ozone and Climate
- Food Industry and Aquatic Biology
- Atmospheric aerosols and clouds
- Isotope Analysis in Ecology
- Protist diversity and phylogeny
- Arctic and Russian Policy Studies
- Climate change and permafrost
- Environmental DNA in Biodiversity Studies
- Oceanographic and Atmospheric Processes
- Amyotrophic Lateral Sclerosis Research
- Maritime Transport Emissions and Efficiency
- Air Quality and Health Impacts
- Geological Studies and Exploration
- Genomics and Phylogenetic Studies
- Bacteriophages and microbial interactions
Korea Polar Research Institute
2016-2025
Icahn School of Medicine at Mount Sinai
2023-2024
Allen Institute for Brain Science
2023-2024
Chungbuk National University
2023
Korea Institute of Geoscience and Mineral Resources
2023
Korea University
2022
Incheon Medical Center
2019
Korea Institute of Ocean Science and Technology
2016
The University of Tokyo
2009-2015
Seoul National University
2012-2013
Abstract. Marine aerosol samples were collected over the western North Pacific along latitudinal transect from 44° N to 10° in late summer 2008 for measurements of organic nitrogen (ON) and carbon (OC) as well isotopic ratios total (TN) (TC). Increased concentrations methanesulfonic acid (MSA) diethylammonium (DEA+) at 40–44° subtropical regions (10–20° N) together with averaged satellite chlorophyll-a data 5-day back trajectories suggest a significant influence marine biological activities...
Abstract. Since the start of industrial revolution, human activities have caused a rapid increase in atmospheric carbon dioxide (CO2) concentrations, which have, turn, had an impact on climate leading to global warming and ocean acidification. Various approaches been proposed reduce CO2. The Martin (or iron) hypothesis suggests that iron fertilization (OIF) could be effective method for stimulating oceanic sequestration through biological pump iron-limited, high-nutrient, low-chlorophyll...
Abstract A repeat expansion in the C9orf72 (C9) gene is most common genetic cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). Here we investigate single nucleus transcriptomics (snRNA-seq) epigenomics (snATAC-seq) postmortem motor frontal cortices from C9-ALS, C9-FTD, control donors. C9-ALS donors present pervasive alterations expression with concordant changes chromatin accessibility histone modifications. The greatest occur upper deep layer excitatory neurons,...
Abstract [1] Using a single-particle mass spectrometer, the size and chemical composition of individual Fe-containing atmospheric aerosols (Fe aerosols) with diameter from 100 to 1800 nm were characterized during Asian outflow season (spring 2008) in Okinawa Island, Japan their sources determined. Fe classified into five unique particle types which mixed specific compound(s) related (crustal, fly ash/K-biomass burning, elemental carbon, metals, vanadium). Particle number-based contribution...
Atlantification-the northward inflow of anomalous waters and biota from the Atlantic into polar basins-has wide-ranging climatological ramifications. We present previously unknown observational evidence that atlantification processes are strengthening in eastern Eurasian Basin. The primary example is diminishing sea ice, which related to a powerful ocean-heat/ice-albedo feedback, accelerates sea-ice losses. Furthermore, we observe extending far beyond Lomonosov Ridge Makarov Basin Arctic...
Received 14 July 2010; revised 12 October accepted 27 published 19 March 2011. [1] Hygroscopic growth of aerosol particles at 85% relative humidity and the number fraction cloud condensation nuclei (CCN; 0.42%, 0.23%, 0.10% supersaturation) as a function dry diameter (24.1–359 nm) were measured simultaneously on board R/V Hakuho‐Maru over western North Pacific during August–September 2008. Highly hygroscopic unimodal distributions observed, except for aerosols, which showed lower northern...
Methanesulfonic acid (MSA), derived from the oxidation of dimethylsulfide (DMS), has a significant impact on biogenic sulfur cycle and climate. Gaseous MSA (MSAg) been often ignored in previous studies due to its quick conversion particulate (MSAp) low concentrations. MSAg, MSAp, nss-SO42- were observed simultaneously for first time with high-time-resolution (1 h) Southern Ocean (SO). The mean MSAg level reached up 3.3 ± 1.6 pptv, ranging ∼24.5 pptv SO, contributing 31% 3% total (MSAT). A...
Abstract Phytoplankton in the Arctic Ocean are subject to nitrogen limitation summer, however, how severely stress affects phytoplankton physiology remains largely unknown. In summers of 2015–2018, we examined distribution photophysiological properties across two contrasting regions with distinctly different levels availability upper water column. We quantified extent using a highly sensitive fluorescence induction and relaxation system obtain continuous underway measurements via discrete...
Abstract. To investigate the influence of marine biological activity on aerosols, aerosol and seawater samples were collected over Southern Ocean (43° S−70° S) Amundsen Sea (70° S−75° during ANA06B cruise conducted in austral summer 2016 aboard Korean icebreaker IBR/V Araon. Over Ocean, atmospheric methanesulfonic acid (MSA) concentration was low (0.10 ± 0.002 µg m−3), whereas its increased sharply up to 0.57 m−3 where Phaeocystis antarctica (P. antarctica), a producer dimethylsulfide (DMS),...
Abstract. There are few shipborne observations addressing the factors influencing relationships of formation and growth aerosol particles with cloud condensation nuclei (CCN) in remote marine environments. In this study, physical properties throughout Arctic Ocean Pacific were measured aboard Korean icebreaker R/V Araon during summer 2017 for 25 d. A number new particle (NPF) events frequently observed both terrestrial air masses. By striking contrast, NPF not detected Three major categories...
Abstract. To investigate the characteristics of particulate methanesulfonic acid (MSA(p)), non-sea-salt sulfate (nss SO42-) and organic carbon (OC) aerosols, aerosol seawater samples were collected over Southern Ocean (43–70∘ S) Amundsen Sea (70–75∘ during ANA06B cruise conducted in austral summer 2016 aboard Korean icebreaker IBR/V Araon. Over Ocean, atmospheric MSA(p) concentration was low (0.10±0.002 µg m−3), whereas its increased sharply up to 0.57 m−3 where Phaeocystis antarctica (P....
Abstract Atlantic‐origin cold saline water has previously not been considered an important contributor to the nutrient supply in Pacific Arctic due effective insulation by overlying Pacific‐origin waters that separate surface mixed layer from deeper Atlantic Water. Based on hydrographic observations northwestern Chukchi Sea 2015 2017, we demonstrate intrusion of into halocline boundary between and 2017 lifted nutrients up layer. We find cyclonic atmospheric circulation was considerably...
Coastal areas around Antarctica such as the Amundsen Sea are important sources of trace metals and biological hotspots, but also experiencing effects climate change, including rapid thinning ice sheets. In central Polynya (ASP), both bio-essential dissolved Fe (DFe) Mn (DMn) were found to be depleted at surface, indicating substantial uptake and/or precipitation. Close Dotson Ice Shelf (DIS) there elevated surface concentrations DMn (>3 nM) surprisingly not for DFe (<0.3 nM). While...
The trace metals zinc (Zn) and cadmium (Cd) are both involved in the metabolic processes of marine phytoplankton, as such, play important roles ocean biogeochemical cycles. In Antarctica, Amundsen Sea (AS) experiences rapid ice shelf melting, polynya (ASP) hosts seasonal phytoplankton blooms austral summer, with implications for atmospheric carbon dioxide drawdown. However, effects melting on biogeochemistry distributions Zn Cd ASP remain poorly studied. Here, we present first combined...
Abstract. Aerosol, rainwater, and sea fog water samples were collected during the cruise conducted over subarctic western North Pacific Ocean in summer of 2008, order to estimate dry, wet, deposition fluxes atmospheric inorganic nitrogen (N). During events, mean number densities particles with diameters larger than 0.5 μm decreased by 12–78%, suggesting that could act preferentially as condensation nuclei (CN) for droplets. Mean concentrations nitrate (NO3−), methanesulfonic acid (MSA), non...
Abstract As the western North Pacific Ocean is located downwind of source regions for spring Asian dust, it an ideal location determining response open waters to these events. Spatial analysis dust events from Pacific, using long‐term daily aerosol index data, revealed three different transport pathways supported by westerly wind system: one passing across northern East/Japan Sea (40°N–50°N), a second moving over entire (35°N–55°N), and third flowing predominantly Siberian continent...
Dimethyl sulfide (DMS) production in the northern Arctic Ocean has been considered to be minimal because of high sea ice concentration and extremely low productivity. However, we found DMS (1-33 nM) melt ponds on at a very latitude (78°N) central up ten times that adjacent open ocean (<3 nM). We divided into three categories: freshwater ponds, brackish saline ponds. Melt from each category had different formation mechanisms associated contents. Closed (salinity >20) particularly...
Abstract. The uptake of methanesulfonic acid (MSA) on existing particles is a major route the particulate MSA formation, however, different still lacking in knowledge. Characteristics aerosol were investigated polynya (an area open sea water surrounded by ice) regions Ross Sea, Antarctica. Particulate mass concentrations, as well population and size distribution, observed simultaneously for first time to access particles. results show that concentration does not always reflect particle...