Korea Institute of Ocean Science and Technology

Transform-to-thrust reactivation of a fossil back-arc spreading system: Evidence from marine magnetic anomalies in the East Sea (Japan Sea)

Transform faults contain rheological weaknesses that can be reactivated into either divergent or convergent boundaries, depending on tectonic stress regime. While rifting triggered from transform fault is well documented, geophysical evidence demonstrating compressional reactivat...

Non-typhoon extreme waves in the Northeast Asian Marginal Seas: Observation-based identification, synoptic conditions, and classification

This study presents an observation-based approach for identifying, characterizing, and classifying non-typhoon extreme waves in the Northeast Asian Marginal Seas using in-situ wave and wind measurements, with reanalysis data used to interpret the associated synoptic conditions. E...

Experimental study on the in-place stability of a self-installing jack-up type 10 MW offshore wind turbine during leg lowering

A 1:25 scale model test was conducted to evaluate the motions, green water risk, and motion-induced interruption (MII) during the leg lowering steps of in-place installation for a self-installing jack-up type 10 MW offshore wind turbine. For three leg lowering steps, in which the...

Multi-tracer evaluation of cesium-137 bioaccumulation and trophic transfer in marine organisms off Jeju Island, Korea

Radionuclides accidentally released from nuclear facilities into the marine environment may affect ecosystems far from their original sources, yet their ecological behavior in such regions remains poorly understood. Using a multi-tracer approach, we evaluated 137 Cs bioaccumulati...

Wind-Load Analysis of a Floating Structure with Different Levels of Geometric Resolution Using OpenFOAM

Wind loads acting on an offshore floating structure are important for the global performance analysis and mooring design. In early design stages, detailed topside geometry may not be fully available; therefore, a wind-load analysis should be performed using simplified geometries....

Seasonal characteristics of submicron aerosols in the coastal atmosphere of southeastern Korea: Influence of urban-port outflow

The impacts of emissions from major urban-port complexes on the coastal marine atmosphere remain insufficiently constrained. Seasonal measurements of submicron aerosol mass concentrations, chemical composition, and particle size distributions were conducted at Geoje Island, a coa...

K34 (3,3″-Dihydroxy-6′-desmethyl Terphenyllin) Promotes Hemoglobin-Supported H2O2 Decomposition and Attenuates Neurodegenerative Phenotypes in APP/PS1 Mice with Focal GiD

Hydrogen peroxide (H2O2) contributes to oxidative stress in Alzheimer’s disease (AD), yet conventional antioxidants that directly scavenge H2O2 have shown limited therapeutic efficacy. Here, we investigated K34 (3,3″-dihydroxy-6′-desmethyl terphenyllin), a catechol-bearing para-t...

Satellite Altimetry Reveals Spatially Heterogeneous Sea-Level Rise, Mesoscale Variability, and Increasingly Frequent Extremes in the East Sea (Sea of Japan), 1993–2024: Dokdo in Regional Context

The East Sea (Sea of Japan) is a semi-enclosed marginal sea with an energetic mesoscale eddy field along the Tsushima Warm Current and its subpolar front. Unlike prior point reconstructions of Dokdo sea level, we use 0.125° gridded satellite altimetry (DUACS, 1993–2024) to map th...

A New Branchipolynoe (Aphroditiformia: Polynoidae) Scale Worm from the Onnuri Deep-sea Hydrothermal Vent Field, Northern Central Indian Ridge

. Phylogenetic analyses support close relationships between the Indian Ocean and Western Pacific hydrothermal polychaetes. Our data provide a foundation for exploring the evolutionary relationship between scale worms and bathymodiolin mussels.

Consecutive Strandings of Porpita porpita Colonies at Different Developmental Stages Along the Coast of Jeju Island

Porpita porpita, a pleustonic colonial hydrozoan, underwent unprecedented large-scale strandings on Jeju Island in June and October 2025. Colonies stranded in June were approximately 30 mm in diameter, whereas the October event was dominated by colonies smaller than 5 mm. Based o...

Generation and Preservation of Submarine Terraces: Insights From Records Imprinted on the Topography of Dokdo Volcano

Abstract Marine terraces archive sea‐level and tectonic history, yet their relationship to individual highstands remains contentious. While most studies focus on subaerial terraces in uplifting settings, submerged terraces in subsiding settings are less explored. We develop a 1‐D...

Field-Based Analysis of Saltwater Intrusion Distance, Arrival Time, and Stratification Index Following a Controlled Barrage Opening in the Nakdong River Estuary, South Korea

Saltwater intrusion in regulated estuaries is commonly assessed using intrusion distance; however, its response to barrage operation may also depend on arrival timing, vertical stratification, and bathymetrically influenced near-bed transport. This study investigated these proces...

Metabolic reprogramming of the acetogen Clostridium sp. AWRP via adaptive laboratory evolution for improved formate-based growth

Abstract Formate is a promising, sustainable feedstock for microbial conversion into value-added products via the Wood–Ljungdahl pathway. Based on the identification of three distinct formate dehydrogenases in Clostridium sp. AWRP, this study investigated the potential of this ac...

Bleaching Dynamics of Crustose Coralline Algae in Jeju Island, Korea

Crustose coralline algae (CCA) are key reef-building organisms, yet their bleaching dynamics and associated environmental factors in natural ecosystems remain poorly understood. This is particularly relevant to Jeju Island, Korea, where declines in canopy-forming macroalgae and t...

Feasibility Assessment of SAM-Assisted Pseudo-Oriented Bounding Box Generation from Ship Point Annotations in KOMPSAT-3/3A Optical Satellite Imagery

Satellite-image-based ship detection is important for maritime traffic management, search and rescue, illegal fishing surveillance, and maritime security.However, constructing oriented bounding box (OBB) annotations requires manual delineation and verification of object boundarie...

A compilation of global bio-optical in situ data for ocean-colour satellite applications – version four

Abstract. A global in situ dataset for validation of satellite products from the ESA Ocean Colour Climate Change Initiative (OC-CCI) is presented. This version of the compilation, with data starting in 1996, extends to 2025, which is important for the validation of recent algorit...

Data-driven enhancement of ocean surface forcing for accurate floating debris transport modelling in the East/Japan Sea

Abstract. Floating debris transport in marginal seas is controlled by a combination of geostrophic currents, wind-driven currents, wave-induced drift, and direct wind forcing, but the relative importance of these processes remains difficult to quantify without in-situ trajectory...

Integrated Valorization of Macroalgae in a Recyclable Ionic Liquid: Hydrothermal Production of Formic and Levulinic Acids with Product Recovery and Biohydrogen Generation

Abstract Marine macroalgae are drawing growing interest as underutilized feedstocks for chemicals and fuels and as high-productivity, carbon-assimilating biomass that could contribute to carbon capture and sequestration strategies. Here, we investigate an ionic-liquid-assisted hy...

Measuring Ocean Surface Waves

Abstract Propagating waves on the ocean surface can be represented as a stochastic process whose statistics are characterized by a spectrum. This paper reviews methods for measuring the wave spectrum and related quantities. Observations begin by sensing fluid dynamical properties...

High genetic connectivity and weak spatial structure in the ghost crab Ocypode stimpsoni (Ortmann, 1897) across Northeast Asia: insights from microsatellite and mtCO1 loci

The dataset includes allele-size microsatellite genotypes for Ocypode stimpsoni individuals (n = 167) collected from seven coastal localities across Northeast Asia, including South Korea, Japan, and Taiwan. These data were used to evaluate population genetic structure, genetic co...