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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1. Marine Geochemistry & Biogeochemistry EDIT

Fluxes of Land Materials to the Ocean

4 View
Water mass transport and mixing
(Ra isotopes, Nd isotopes, Th-230, REE, Rn)
Atmospheric fluxes and chemistry


3 View
Particle/element settling and sedimentation
(Th-234, Pb-210, Po-210, TM, REE, colloids)
Atmospheric fluxes and chemistry


2 View
Nutrients and ecological responses
(NCP – O2/Ar, pigments, organic nut.)
1 View
Carbon (DOC, POC) fluxes and cycling
(C/N, CDOM, C-13, C-14, amino acids)

2. Groundwater and River-driven Fluxes to the Ocean EDIT

Oceanic Biogeochemistry and Ecosystems

4 View
Submarine groundwater discharge (SGD)
(Rn-222, Ra isotopes, thermal sensors)
3 View
SGD-driven fluxes of nutrients and trace elements
(trace elements, REE, heavy isotopes, N-15)
2 View
SGD dependent ecosystems
(islands, tidal flats, and embayment)
1 View
Riverine fluxes
(trace elements, REE, CDOM, and DOC)

3. Atmospheric Depositional Fluxes and Aerosols EDIT

Marine Carbon Cycles

4 View
Systematics of radon daughters
(Rn-222, Pb-210, Bi-210, Po-210)
3 View
Atmospheric depositional fluxes
(Pb-210, trace elements, REE, DOM, nutrients)
2 View
Carbonaceous aerosols
(DOC, CDOM, and brown carbon)
1 View
Anthropogenic sources in air
(Sulfur, nitrogen, metals, OM)

4. Environmental Disasters EDIT

Environmental Radioactivity and Isotopes

4 View
Red tides, green tides
(nutrient dynamics and sources, Ra isotopes)
3 View
Environmental radioactivity
(Rn-222, Po-210, Cs-137, Ra isotopes)
2 View
Ultrafine particulate matter (PM2.5)
(Po-210, isotopes, sources, sinks)
1 View
Earthquake precursors
(Rn-222, Rn-220)