A5066836244- Oceanographic and Atmospheric Processes
- Climate variability and models
- Marine and coastal ecosystems
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Atmospheric and Environmental Gas Dynamics
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Marine and fisheries research
- Groundwater and Isotope Geochemistry
- Climate change and permafrost
- Tropical and Extratropical Cyclones Research
- Marine Bivalve and Aquaculture Studies
- Hydrocarbon exploration and reservoir analysis
- Meteorological Phenomena and Simulations
- Ocean Waves and Remote Sensing
- Engineering Applied Research
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Structural Behavior of Reinforced Concrete
- Geological and Geophysical Studies
- Material Selection and Properties
- Pharmacological Effects and Assays
- Geochemistry and Elemental Analysis
- Marine animal studies overview
Fuji Tokoha University
2012-2015
Japan Agency for Marine-Earth Science and Technology
2004-2014
Tokoha Gakuen University
2013
Japan Science and Technology Agency
2010
Institute for Global Environmental Strategies
2002-2004
United States Global Change Research Program
2002
Kansai Electric Power (Japan)
1997-2001
Nagoya Institute of Technology
1979
The Luzon Strait transport (LST) from the Pacific into South China Sea (SCS) is examined using results a high-resolution ocean general circulation model. LST model has mean value of 2.4 Sv (Sv ( 106 m3 s 21) and reaches its seasonal maximum (6.1 westward) in winter minimum (0.9 eastward) summer. Both annual variation compare favorably with earlier observations. On an interannual time scale, tends to be higher during El Nino years lower La Nina years, (minimum) leading mature phase (La Nina)...
New radiocarbon and chlorofluorocarbon‐11 data from the World Ocean Circulation Experiment are used to assess a suite of 19 ocean carbon cycle models. We use distributions inventories these tracers as quantitative metrics model skill find that only about quarter is consistent with new data‐based metrics. This should serve warning bell larger community not all well current generation At same time, this highlights danger in simply using available models represent state‐of‐the‐art modeling...
A suite of standard ocean hydrographic and circulation metrics are applied to the equilibrium physical solutions from 13 global carbon models participating in phase 2 Ocean Carbon‐cycle Model Intercomparison Project (OCMIP‐2). Model‐data comparisons presented for sea surface temperature salinity, seasonal mixed layer depth, meridional heat freshwater transport, 3‐D fields, overturning. Considerable variation exists among OCMIP‐2 simulations, with some falling noticeably outside available...
The variation of the North Equatorial Current (NEC) bifurcation is investigated using results from a high‐resolution ocean general circulation model (OGCM). occurs at about 15.5°N for annual average and easily identifiable in upper 500 m, but it varies with time depth. In agreement recent observations, during summer season NEC moves equatorward weak poleward shift depth, while large movement depth found winter season. Vertical mode decomposition indicates that seasonal dominated by first two...
Analysis of wind data over the past 40 years and results from a high‐resolution general circulation model has revealed existence previously undescribed that connects tropical Pacific with Indian Ocean. As direct response to wind, water origin enters South China Sea through Luzon Strait, there part continues southward into Java returns Makassar Strait. This contains strong signal El Niño Southern Oscillation appears have notable impact on Indonesian Throughflow heat transport.
In the Indian Ocean, mid-depth oxygen minimum zones (OMZs) occur in Arabian Sea and Bay of Bengal. The lower part Arabian-Sea OMZ (ASOMZ; below 400 m) intensifies northward across basin; contrast, its upper (above is located central/eastern basin, well east most productive regions along western boundary. Bay-of-Bengal (BBOMZ), although strong, weaker than ASOMZ. To investigate processes that maintain Indian-Ocean OMZs, we obtain a suite solutions to coupled biological/physical model. Its...
The future conditions of Arctic sea ice and marine ecosystems are interest not only to climate scientists, but also economic governmental bodies. However, the lack widespread, year-long biogeochemical observations remains an obstacle understanding complicated variability biological pump. Here we show early winter maximum sinking biogenic flux in western Ocean illustrate importance shelf-break eddies pumping from wide shelves adjacent deep basins using a combination mooring three-dimensional...
Abstract. We compare modeled oceanic carbon uptake in response to pulse CO2 emissions using a suite of global ocean models and Earth system models. In emission 590 Pg C (corresponding an instantaneous doubling atmospheric from 278 556 ppm), the fraction emitted that is absorbed by is: 37±8%, 56±10%, 81±4% (model mean ±2σ ) year 30, 100, 1000 after pulse, respectively. Modeled on timescales decades about century strongly correlated with simulated present-day chlorofluorocarbons (CFCs) across...
Antarctic krill embryos and larvae were experimentally exposed to 380 (control), 1000 2000 µatm p CO 2 in order assess the possible impact of ocean acidification on early development krill. No significant effects detected embryonic or larval behaviour at ; however, was disrupted before gastrulation 90 per cent embryos, no hatched successfully. Our model projections demonstrated that Southern Ocean sea water could rise up 1400 krill's depth range under IPCC IS92a scenario by year 2100...
Abstract. The largest pH decline and widespread undersaturation with respect to aragonite in this century due uptake of anthropogenic carbon dioxide the Arctic Ocean have been projected. reductions saturation state caused by melting sea ice as well an increase concentration atmospheric dioxide. Therefore, future projections will be affected how rapidly reduction occurs. observed recent sea-ice loss has more rapid than projected many climate models that contributed Intergovernmental Panel on...
The annual subduction rate in the North Pacific is estimated using five-day outputs from a high-resolution general circulation model (GCM). Two maxima (>200 m yr−1) are found western Pacific: one responsible for formation of subtropical mode water (STMW) and other central (CMW). A local maximum (>75 also region eastern (ESMW). These results compared with calculation winter mixed layer depth mean velocity fields to examine effect mesoscale eddies. Although eddies do not markedly affect...
Abstract Ocean variations at semiannual, annual, and interannual time scales in the Mindanao Dome (MD) region of southern Philippine Sea were examined using data derived from underwater sensors on Triangle Trans-Ocean Buoy Network (TRITON) buoys 8°N, 137°E; 5°N, 130°E. Annual signal dominated above 300-m depth MD region. At 137°E, saline water exceeding 35 psu was observed 100–200-m boreal winter to spring, seemingly associated with meridional migration North Equatorial Countercurrent during...
Abstract A complex pattern of zonal currents below the thermocline has been observed in equatorial Pacific and Atlantic Oceans. The have typical speeds from 10 to 15 cm s−1 extend as deep 2500 m. Their structure can be divided into two overlapping parts: jets (EDJs), centered on equator alternating vertical with a wavelength several hundred meters, Equatorial Intermediate Current system (EICS), composed large scale latitude over degrees either side equator. strongest EICS current is westward...
Mooring observations were conducted from October 1999 to July 2002 near the east coast of Mindanao Island, Philippines, (6°50′N, 126°43′E) observe current variability at axis Current (MC). The MC was a strong with subsurface velocity maximum exceeding 1.3 m s −1 approximately 100 depth. flows shallower than 700 m, and there no evidence steady northward (the Undercurrent) study location. Compared large average velocity, low (standard deviation <0.2 for all directions). All observed...
Ocean general circulation models (OGCMs) have long been used to investigate oceanic circulations and their variation with various spatial temporal scales. Mesoscale eddies, which diameters are about 100 km, should be resolve in order reproduce not only basin-scale but also eddy activities proper path of western boundary currents. They play an important role meridional transport heat momentum. Recently, eddy-resolving OGCM simulation 0.1/spl deg/ horizontal grid spacing the North Atlantic...
Analysis of altimeter data combined with results from a high‐resolution general circulation model has revealed the existence semiannual variation in western tropical Pacific. The cannot be explained by local Ekman pumping alone, but is also related to westward propagation Rossby waves originating central Pacific, corresponding northern hemisphere Inter‐Tropical Convergence Zone and southern South Pacific Zone. This signal intensifies toward boundary appears have notable impact on there. In...