A5078344814- Marine and coastal ecosystems
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Oil Spill Detection and Mitigation
- Geology and Paleoclimatology Research
- Groundwater and Isotope Geochemistry
- Hydrocarbon exploration and reservoir analysis
- Ocean Acidification Effects and Responses
- Marine Biology and Ecology Research
- Mercury impact and mitigation studies
- Toxic Organic Pollutants Impact
- Geochemistry and Elemental Analysis
- Arctic and Antarctic ice dynamics
- Coastal and Marine Management
- Microbial Community Ecology and Physiology
- CO2 Sequestration and Geologic Interactions
- Oceanographic and Atmospheric Processes
- Marine and Coastal Research
- Agriculture, Soil, Plant Science
- Radioactivity and Radon Measurements
- Peatlands and Wetlands Ecology
- Integrated Water Resources Management
- Geochemistry and Geologic Mapping
- Isotope Analysis in Ecology
- Microbial bioremediation and biosurfactants
Pusan National University
2022-2024
University of Rochester
2019-2022
Seoul National University
2006-2022
Stennis Space Center
2012-2019
University of Southern Mississippi
2010-2019
Oceanography Society
2018
University of Vermont
2015-2017
Texas A&M University
2011
Here, we report the initial observations of distributions polycyclic aromatic hydrocarbons (PAH) in subsurface waters near Deepwater Horizon oil well site (also referred to as Macondo, Mississippi Canyon Block 252 or MC252 well). Profiles situ fluorescence and beam attenuation conducted during 9‐16 May 2010 were characterized by distinct peaks at depths greater than 1000 m, with highest intensities close wellhead decreasing increasing distance from wellhead. Gas chromatography/mass...
Rare earth elements have generally not been thought to a biological role. However, recent work has demonstrated that the light REEs (LREEs: La, Ce, Pr, and Nd) are essential for at least some methanotrophs, being co-factors in XoxF type of methanol dehydrogenase (MDH). We show here dissolved LREEs were significantly removed submerged plume methane-rich water during Deepwater Horizon (DWH) well blowout. Furthermore, incubation experiments conducted with naturally methane-enriched waters from...
Abstract The continental shelves of the Arctic Ocean and surrounding seas contain large stocks organic matter (OM) methane (CH 4 ), representing a potential ecosystem feedback to climate change not included in international agreements. We performed structured expert assessment with 25 permafrost researchers combine quantitative estimates sensitivity carbon subsea domain (i.e. unglaciated portions exposed during last glacial period). Experts estimated that contains ∼560 gigatons (GtC;...
Abstract. Declining seawater pH, associated with rising atmospheric CO2 levels, adversely affects marine organisms and ecosystems, thereby posing a considerable risk to coastal fisheries economies. However, the effects of long-term pH variations in waters remain poorly understood. In this study, we investigated variability Korea over an 11-year period (2010–2020) sought identify principal drivers fluctuations. Unlike persistent declines observed open oceans other systems, Korean showed no...
Abstract Ongoing ocean warming can release methane (CH 4 ) currently stored in sediments as free gas and hydrates. Once dissolved waters, this CH be oxidized to carbon dioxide (CO 2 ). While it has been hypothesized that the CO produced from aerobic oxidation could enhance acidification, a previous study conducted Hudson Canyon shows small short‐term influence on pH inorganic radiocarbon. Here we expand upon investigation assess impact of widespread seepage chemistry possible accumulation...
To understand the impact of Deepwater Horizon well blowout on dissolved trace element concentrations, samples were collected from areas around oil rig explosion site during four cruises in early and late May 2010, October 2011. In surface waters, Ba, Fe, Cu, Ni, Mn, Co relatively correlated with salinity all cruises, suggesting mixing river water was main influence metal distributions these waters. However, deep oil/gas plumes (1000-1400 m depth), modestly elevated concentrations Ba observed...
Abstract While decreasing occurrence and duration of lake ice cover is well‐documented, biogeochemical dynamics in frozen lakes remain poorly understood. Here, we interpret winter physical time series from eutrophic Missisquoi Bay (MB) hyper‐eutrophic Shelburne Pond (SP) to describe variable drivers under biogeochemistry systems fundamentally different lake‐watershed configurations (lake area, : watershed area). The continuous cold the 2015 drove MB sediment‐water interface most severe...
The Deepwater Horizon accident resulted in a substantial uncontrolled hydrocarbon release to the northern Gulf of Mexico, much which was entrained deep submerged plumes. While bio-degradation hydrocarbons has been inferred from microbial biomass and genetics, amount conversion oil gas carbon remains uncertain having only estimated modeling studies. Here we examine correlated depletions nitrate, phosphate oxygen plumes conclude that portion these converted (0.8–2 × 1010 mol C). This contrasts...
Abstract Microbial aerobic oxidation is known to be a significant sink of marine methane (CH 4 ), contributing the relatively minor atmospheric release this greenhouse gas over vast stretches ocean. However, chemical kinetics CH are not well established, making it difficult predict and assess extent that oxidized in seawater following seafloor release. Here we investigate using mesocosm incubations fresh samples collected from seep fields Hudson Canyon, U.S. Atlantic Margin MC118, Gulf...
In order to determine the physical and chemical factors controlling outbreak of red tides, we monitored nutrients other environmental parameters using a novel real‐time monitoring buoy system during summer 2003 in southern sea Korea, where red‐tide outbreaks occur every year. The data on bioluminescence, which may indicate presence bioluminescent dinoflagellate species, showed sudden increase under lowest concentrations dissolved inorganic nutrients. Our for first time provides variations...
In May 2010, the National Institute for Undersea Science and Technology (NIUST) had a 17-day research cruise aboard UNOLS vessel R/V Pelican scheduled. NIUST is partnership of University Mississippi, Southern Mississippi NOAA. Before sailing, Deepwater Horizon oil platform burned sank, resulting in an uncontrolled spill at depth 5000 ft Canyon Block 252. Subsequently, decision was made to abort planned hydrate ship wreck favor response. The primary goals redefined were acquire baseline early...
Abstract The methane dynamics in the waters of Lakes Michigan and Superior, components North American Great Lake system, were investigated using measurements concentration natural radiocarbon ( 14 C‐CH 4 ) dissolved these lake waters. All above modern levels regardless location depth with a range 117‐145% carbon (pMC). Methane concentrations deep basin both lakes low, ranging from 3.3 to 4.3 nM, minimal vertical variation. However, CH increased toward coastal areas lakes, possibly due higher...
Abstract During aerobic oxidation of methane (CH 4 ) in seawater, a process which mitigates atmospheric emissions, the 12 C‐isotopologue reacts with slightly greater rate constant than 13 C‐isotopologue, leaving residual CH isotopically fractionated. Prior studies have attempted to exploit this systematic isotopic fractionation from quantify extent that pool has been oxidized seawater. However, cultivation‐based suggested fundamentally changes as microbial population blooms response an...
To investigate the factors affecting water quality in coastal regions with sea dike constructions, surface outside a was monitored for six years from 2015 to 2020 Saemangeum region of Korea. Statistical analyses high-frequency measurements revealed that this system predominantly governed by natural processes followed pollutant inputs as secondary influencing factor. Severe dissolved oxygen (DO) depletion observed waters during warm periods, probably owing advection DO-depleted elsewhere...
Previous studies of microbially mediated methane oxidation in oceanic environments have examined the many different factors that control rates oxidation. However, there is debate on what factor(s) are limiting these types environments. These include availability methane, O2, trace metals, nutrients, density cell population, and influence CO2 production may pH. To look at this process its entirety, we developed an automated mesocosm incubation system with a Dissolved Gas Analysis System...
The abundance and fluxes of selected dissolved trace elements (TE), nutrients, organic carbon (DOC) were quantified in the Atchafalaya River Basin to better understand its influence on chemical regime Louisiana Shelf, a region where bottom water hypoxia occurs annually during late spring early fall. Water samples collected from throughout entire including Mississippi Red Rivers as well basin swamp waters April November 2010, June 2011, which represent "typical" high low, "unusual" river...