A5078404212- Oceanographic and Atmospheric Processes
- Marine and fisheries research
- Marine and coastal ecosystems
- Marine Bivalve and Aquaculture Studies
- Arctic and Antarctic ice dynamics
- Climate variability and models
- Isotope Analysis in Ecology
- Tropical and Extratropical Cyclones Research
- Geology and Paleoclimatology Research
- Underwater Vehicles and Communication Systems
- Identification and Quantification in Food
- Ocean Acidification Effects and Responses
- Marine Biology and Ecology Research
- Ocean Waves and Remote Sensing
- Fish Ecology and Management Studies
- Aquatic and Environmental Studies
- Marine animal studies overview
- Coastal and Marine Dynamics
- Microbial Community Ecology and Physiology
- Environmental DNA in Biodiversity Studies
- Geological and Geophysical Studies
- Coastal wetland ecosystem dynamics
- Meteorological Phenomena and Simulations
- Water Quality Monitoring Technologies
- Aquaculture Nutrition and Growth
Japan Fisheries Research and Education Agency
2016-2025
Hokkaido University
2006-2008
Japan Science and Technology Agency
2008
Institute for Global Environmental Strategies
2004
To address various fisheries science problems around Japan, the Japan Fisheries Research and Education Agency (FRA) has developed an ocean forecast system by combining circulation model based on Regional Ocean Modeling System (ROMS) with three-dimensional variational analysis schemes. This system, which is called FRA-ROMS, a basic essential tool for systematic conduct of science. The main aim FRA-ROMS to realistically simulate mesoscale variations over Kuroshio-Oyashio region. Here, in situ...
Abstract A two‐dimensional individual‐based fish movement model coupled with bioenergetics was developed to simulate the observed migration and growth of Japanese sardine ( Sardinops melanostictus ) in western North Pacific. In model, derived from ocean–environmental data as driving force, adapted a kinesis behavior. The successfully simulated transport patterns during egg larval stages northward migrations juvenile stage 2005, 2006 2007. results showed that both temperature Kuroshio...
Abstract To examine the ocean acidification of coastal water as result oceanic uptake anthropogenic atmospheric CO 2 , we initiated monitoring in eastern part Tsugaru Strait, through which Warm Current flows eastward from Sea Japan to North Pacific. Annual mean pH and CaCO 3 saturation state during 2012–2019 decreased considerably throughout all depths at rates 0.0030–0.0051 0.017–0.036 years −1 respectively. These decrease are faster than those caused by increasing observed previous...
To investigate the iron cycle at Station A4 in Oyashio region of western subarctic Pacific, we developed a 1‐D ecosystem model consisting 14 components including cycle. The parameters associated with were optimized by assimilating monthly averaged data from time series observations for depth‐integrated net primary production, nitrate, silicate, dissolved and particulate within surface mixed layer (ML) two depths (200 300 m depth). successfully reproduced demonstrated that (1) on an annual...
Abstract The occurrence and density of P acific saury C ololabis saira larvae juveniles were examined in relation to environmental factors during the winter spawning season K uroshio urrent system, based on samples from extensive surveys off Pacific coast Japan 2003–2012. Dense distributions observed areas around offshore side Kuroshio axis except a large meander year (2005). relationships larval juvenile given sea surface temperature ( SST ), salinity SSS chlorophyll‐ concentration CHL ) by...
Repeated glider surveys were conducted in the Japan Sea during April–June 2016. Observations revealed mesoscale hydrographic structures of subpolar front, Tsushima Warm Current, and eddies formed around flows central off Sado Island, addition to fine-scale water properties associated with variation. Data collected from satellite altimeters thermometers, profiling floats, ship conductivity–temperature–depth profiles also analyzed elucidate spatiotemporal characteristics multiscale phenomena:...
Abstract Ito, S-I., Okunishi, T., Kishi, M. J., and Wang, 2013. Modelling ecological responses of Pacific saury (Cololabis saira) to future climate change its uncertainty. – ICES Journal Marine Science, 70: 980–990. An ecosystem-based bioenergetics model was used investigate the global warming. The forced by projected sea surface temperature (SST) generated models that formed bases for Intergovernmental Panel on Climate Change fourth Assessment Report (IPCC-AR4). Twelve models, which...
Abstract To clarify the effects of temperature on recruitment chub mackerel ( Scomber japonicus ) in North Pacific, we investigated influence winter surface WST spawners at time maturity around spawning grounds and ambient spring larvae using estimated ET obtained from particle tracking experiments. We found a significant positive correlation between approximately 10 days following hatching per stock biomass RPS after 2000. The closer (more meandering) Kuroshio Current KC axis was relation...
Abstract To investigate the relationships between movement of an eddy and its interior structure water properties, four profiling floats were deployed in anticyclonic western North Pacific 2013 (April–October). Daily float profiles showed rapid changes temperature salinity corresponding to strong interactions eddies north subtropical Kuroshio Extension. After first interaction with a warm‐core April, isolation winter mixed layer from surface was observed, forming subsurface remnant layer....
Abstract Field data and three-dimensional numerical simulations were used to evaluate the impact of water dilution on eutrophication. To dilute eutrophic in Lake Barato, Japan, an Inlet Project was carried out during summer 2005 via a 1 m3/sec inlet. River discharged from margin upper basin lake water. We undertook simulation total nitrogen (TN) phosphorus (TP) distribution considering five inlet cases by using Princeton Ocean Model (POM). Total N TP concentrations TN: 1.3 mg/l TP: 0.08...
Abstract Growth variability was examined for Pacific saury Cololabis saira larvae under contrasting environments across the Kuroshio axis, based on samples collected during winter spawning season in 2013 and 2014. The growth rate index (residual of otolith marginal 3‐day mean increment width from linear regression knob length) compared among three areas: inshore side offshore axis relation to sea surface temperature ( SST ), salinity SSS ) chlorophyll‐ a CHL concentration. were more densely...
Abstract In the stratified ocean, vertical eddy diffusivity in subsurface pycnocline plays a major role new production through transporting nutrients upwards from darker/nutrient-rich layer. order to evaluate that was less available layers where indirect estimations are difficult, we conducted direct microstructure measurements upper 300 m of open Pacific during summer, 40°S 50°N along 170°W and 137°E 120°W across subtropical North (21°30′N–23°N). The mid- low-latitude regions occupied...