All pages below are in Japanese.
- Water flow- Ocean salinity- Deep circulation and belt conveyor model - Antarctic bottom water and North Pacific deep water - Intermediate water of the North Pacific - Surface mixed layer - Spring bloom and surface mixed layer - Assignment: is the deep circulation permanent?
- Organic matter in the ocean - Organic matter in the ocean (Introduction)- Size classification of organic matter in the ocean - Organic matter in particulate and dissolved forms- Sinking velocity of particles - Sinking of organic particles in the ocean (theory) - Marine snow and feeding of eel larvae - Sediment trap observations- Assignment: calculate the sedimentation rate of particles in the ocean - Measurement of organic carbon- Global distribution of dissolved organic carbon in the ocean - Persistent organic matter- Radiocarbon age method - 14C age of dissolved organic carbon - Composition of organic matter- Organic gases in the ocean (overview and supplementary) - Organosulfur gases and the CLAW hypothesis - The demise of the CLAW hypothesis and SOLAS research- Aerosol formation and growth, cloud condensation nuclei (supplementary) - Halocarbons in the ocean
- Inorganic carbonate in seawater- History of global climate change and carbon budget - Vertical distribution of carbon dioxide in the ocean- Reaction equation for equilibrium state of carbonic acid components and water in seawater - Calculate the concentration and composition ratio of carbonic acid components dissolved in water - Calculate pH of rainwater - Calculate pH of seawater - Formation of calcium carbonate particles and the saturation concentration of carbon dioxide- Alkalinity of the ocean and dissolution of calcium carbonate particles - Saturation depth of calcium carbonate particles in the ocean - Vertical cross section of alkalinity and total carbonic acid in the Pacific Ocean - XY plot of total carbonic acid and alkalinity
- Oxygen in the ocean - Oxygen of the Earth- Oxygen in the ocean (overview) - Net oxygen consumption - Formula for calculating oxygen saturation concentration in seawater (Excel file)- Apparent oxygen utility (AOU) overview - Vertical distribution of apparent oxygen utility (AOU) - Global distribution of dissolved oxygen- Dissolved oxygen measurement (water sampling method for DO)
- Nutrients in the ocean- What are the nutrients in the ocean? - Factors limiting the primary production of the ocean (nutrient supply to the surface layer)- Silicate consumption and biological production by diatoms- Diatom growth and silicic acid depletion (cartoon style explanation) - Global distribution of nutrients- Global distribution of nutrients (differences in silicic acid) - Nutrient components limiting primary production (characteristics by sea area) - Nitrate deficiency in the Pacific Arctic Ocean (Chukchi Sea)- Si uptake ratio under iron-limited and iron-unlimited conditions (Study Introduction) - Transfer of C, N, P, and O by primary production and organic decomposition - Calculation model of marine primary production (analysis assignment)- The mystery of the nitrogen/phosphorus ratio in the ocean (N/P = 16) - Ocean observations - XY plot of N and P for the entire ocean- XY plot of phosphoric acid (P) versus oxygen consumption (AOU) - Download climate data from World Ocean Atlas
- Ocean sediments - Chemistry of ocean sediments (Introduction)- Ocean sediments and biological disturbance - Chemical reactions in sediments (Overview)- Energy balance of chemical reactions - Energy balance of respiration- Hydrogen sulfide generation by sulfate respiration in marine sediments - Half-reaction equation for respiration- Redox potential of the half-reaction of respiration - Nernst equation and redox potential (fundamentals of physical chemistry)- Chemical form of sulfur (S) in seawater (Pourbaix diagram) - Chemical form of iron (Fe) in seawater (Pourbaix diagram)- Introduction to ocean sediment observation
- Radionuclides in the ocean- Sources of artificial radionuclides (Dr. Hyoe Takada, Fukushima University)
- Polar ocean and sea ice (in preparation)
- Book review of oceanography textbooks
