Research Overview EDIT
The most important three issues in ocean & environmental sciences may be “climate change, ecosystem change, and pollution” which are driven mainly by humans. These issues are tightly linked to the fluxes of terrestrial materials to the ocean and their biogeochemical cycles in the ocean. We study (1) fluxes of chemical species via the atmosphere, groundwater, and river to the ocean, and (2) biogeochemical reactions, cycling, and sedimentation of chemical species in oceans (see the illustration). We take advantages of various radionuclides for tracing these environmental processes. Under this broad research scope, our main research fields can be divided into three specific areas: (1) Radionuclides – applications to key environmental studies; (2) Carbon- nitrogen-phosphorus cycling and ecological consequences; (3) Trace elements and rare earth elements – pollution and behaviors.
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RESEARCH TOPICS
1. Marine Geochemistry & Biogeochemistry EDIT
Fluxes of Land Materials to the Ocean
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Water mass transport and mixing
(Ra isotopes, Nd isotopes, Th-230, REE, Rn)
Atmospheric fluxes and chemistry
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Particle/element settling and sedimentation
(Th-234, Pb-210, Po-210, TM, REE, colloids)
Atmospheric fluxes and chemistry
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Nutrients and ecological responses
(NCP – O2/Ar, pigments, organic nut.)
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Carbon (DOC, POC) fluxes and cycling
(C/N, CDOM, C-13, C-14, amino acids)
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2. Groundwater and River-driven Fluxes to the Ocean EDIT
Oceanic Biogeochemistry and Ecosystems
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Submarine groundwater discharge (SGD)
(Rn-222, Ra isotopes, thermal sensors)
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SGD-driven fluxes of nutrients and trace elements
(trace elements, REE, heavy isotopes, N-15)
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SGD dependent ecosystems
(islands, tidal flats, and embayment)
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Riverine fluxes
(trace elements, REE, CDOM, and DOC)
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3. Atmospheric Depositional Fluxes and Aerosols EDIT
Marine Carbon Cycles
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Systematics of radon daughters
(Rn-222, Pb-210, Bi-210, Po-210)
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Atmospheric depositional fluxes
(Pb-210, trace elements, REE, DOM, nutrients)
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Carbonaceous aerosols
(DOC, CDOM, and brown carbon)
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Anthropogenic sources in air
(Sulfur, nitrogen, metals, OM)
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4. Environmental Disasters EDIT
Environmental Radioactivity and Isotopes
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Red tides, green tides
(nutrient dynamics and sources, Ra isotopes)
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Environmental radioactivity
(Rn-222, Po-210, Cs-137, Ra isotopes)
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Ultrafine particulate matter (PM2.5)
(Po-210, isotopes, sources, sinks)
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Earthquake precursors
(Rn-222, Rn-220)
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