A5084882864- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Cryospheric studies and observations
- Geological and Geophysical Studies
- Arctic and Antarctic ice dynamics
- Isotope Analysis in Ecology
- Climate change and permafrost
- Marine and environmental studies
- Geological formations and processes
- Atmospheric and Environmental Gas Dynamics
- Image Processing and 3D Reconstruction
- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Offshore Engineering and Technologies
- Mercury impact and mitigation studies
- Toxic Organic Pollutants Impact
- Indigenous Studies and Ecology
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Polar Research and Ecology
- Marine and Coastal Research
- Protist diversity and phylogeny
- Marine Biology and Ecology Research
Korea Polar Research Institute
2016-2025
Korea Institute of Geoscience and Mineral Resources
2003-2009
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
1995-1996
ABSTRACT In this study, we present new detailed biomarker‐based sea ice records from two sediment cores recovered in the Chukchi Sea and East Siberian Sea. These biomarker data may provide insights on processes controlling recent past changes. The proxy show (i) minimum extent during Early Holocene, (ii) a prominent Mid‐Holocene short‐term high‐amplitude variability ice, primary production Pacific‐Water inflow, (iii) significantly increased last ca. 4.5k cal BP. This Late Holocene trend...
Abstract Little is known about the production of fluorescent dissolved organic matter (FDOM) in anoxic oceanic sediments. In this study, sediment pore waters were sampled from four different sites Chukchi-East Siberian Seas area to examine bulk carbon (DOC) and their optical properties. The FDOM, coupled with increase nutrients, was observed above sulfate-methane-transition-zone (SMTZ). presence FDOM concurrent sulfate reduction increased alkalinity (R 2 > 0.96, p < 0.0001), suggesting...
Abstract The changes in atmospheric p CO 2 provide evidence for the release of large amounts ancient carbon during last deglaciation. However, sources and mechanisms that contributed to this process remain unresolved. Here, we present substantial terrestrial remobilization Canadian Arctic following Laurentide Ice Sheet retreat. Glacial-retreat-induced physical erosion bedrock has mobilized petrogenic carbon, as revealed by sedimentary records radiocarbon dates thermal maturity organic from...
Abstract High-resolution stable oxygen and carbon isotope sedimentological investigations were carried out on four west-east profiles at the East Greenland continental margin between 68° 75°N. The sediment cores represent distinct glacial/interglacial palaeoclimatic episodes over past 190 ka. Based stratigraphy AMS 14 C dating, our data can be well correlated with global climate record. However, there are some excursions from curve suggesting a local/regional overprint by meltwater events of...
Abstract Submarine groundwater discharge could impact the transport of critical solutes to ocean. However, its driver(s), significance over geological time scales, and geographical coverage are poorly understood. We characterize a submarine seep from continental slope off northern Norway where substantial amount meteoric water was detected. reconstruct seepage history textural relationships U‐Th geochronology authigenic minerals. demonstrate how glacial‐interglacial dynamics have promoted...
Abstract The hydrographic variability in the fjords of Svalbard significantly influences water mass properties, causing distinct patterns microbial diversity and community composition between surface subsurface layers. However, surveys on phytoplankton-associated bacterial communities, pivotal to ecosystem functioning Arctic fjords, are limited. This study investigated interactions phytoplankton heterotrophic communities fjord waters through comprehensive eDNA metabarcoding with 16S 18S rRNA...
Abstract. In this study, we investigated sedimentary organic carbon (OC) dynamics in Kongsfjorden, Svalbard, using three multicores collected during the HH22 and HH23 cruises aboard RV Helmer Hanssen 2022 2023. We assessed relative contributions of petrogenic, soil-derived, plant-derived, marine OC by applying a four-source apportionment approach based on Δ14Corg, δ13Corg, lignin parameters, including (Ad/Al)ᵥ ratio phenol concentrations, with Monte Carlo (MC) analysis. Age-depth models...
ABSTRACT The Svalbard archipelago at the border of Arctic Ocean experiences substantial glacier retreat due to global warming, resulting in a termini from marine terrestrial settings. However, impact these transitions on environments remains poorly understood. To improve our understanding how responds fluctuations climate and glaciers, we reconstructed past glacimarine Hornsund, southern Svalbard, over last 4,900 years. By tracking sediment provenance using detrital neodymium isotopes...
Two new secondary metabolites, arcticoside (1) and C-1027 chromophore-V (2), were isolated along with chromophore-III fijiolides A B (3–5) from a culture of an Arctic marine actinomycete Streptomyces strain. The chemical structures 1 2 elucidated through NMR, mass, UV, IR spectroscopy. hexose moieties in determined to be d-glucose combination acid hydrolysis, derivatization, gas chromatographic analyses. Arcticoside which have benzoxazine ring, inhibited Candida albicans isocitrate lyase....
Deglaciation has accelerated the transport of minerals as well modern and ancient organic matter from land to fjord sediments in Spitsbergen, Svalbard, European Arctic Ocean. Consequently, such may contain significant levels total mercury (THg) bound terrestrial matter. The present study compared THg contents surface three settings Spitsbergen: Hornsund southern which high annual volume loss glacier receives sediment multiple tidewater glaciers, Dicksonfjorden central glacifluvial rivers,...
Abstract Glacigenic bedforms such as glacial lineations and moraines on the Chukchi East Siberian margins of Arctic Ocean reveal recurrent waxing waning voluminous ice masses. Despite their paleoclimatic significance, timing, geographic distribution, mechanisms these glaciations remain inadequately understood. To enhance our understanding Quaternary history, we study high‐resolution swath bathymetry subbottom profiler data with lithostratigraphy provenance four sediment cores. These...