A5040586298- Oceanographic and Atmospheric Processes
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Ocean Waves and Remote Sensing
- Tropical and Extratropical Cyclones Research
- Marine and coastal ecosystems
- Cryospheric studies and observations
- Coastal and Marine Dynamics
- Climate variability and models
- Polar Research and Ecology
- Geological and Geophysical Studies
- Earthquake and Tsunami Effects
- Geological formations and processes
- Heat Transfer and Boiling Studies
- Radioactive contamination and transfer
- Ocean Acidification Effects and Responses
- Fluid Dynamics and Mixing
- Marine Biology and Ecology Research
- Food Industry and Aquatic Biology
- Geophysics and Gravity Measurements
- Nuclear Engineering Thermal-Hydraulics
- Advanced Sensor Technologies Research
- Ergonomics and Musculoskeletal Disorders
- Landslides and related hazards
Tokyo University of Marine Science and Technology
2015-2024
Woods Hole Oceanographic Institution
2017
Ibaraki University
2017
Japan Science and Technology Agency
2017
Mechanics' Institute
2017
Stanford University
2017
Centre for Research in Engineering Surface Technology
2017
Fuji Electric (Japan)
2011-2017
Keio University
2004
The University of Tokyo
1999
Abstract One year moorings at depths greater than 3000 m on the continental slope off Vincennes Bay, East Antarctica, reveal cold (<−0.5°C) and fresh (<34.64) signals of newly formed Antarctic Bottom Water (AABW). The signal appeared in June, 3 months after onset active sea‐ice production nearby Bay Polynya (VBP). AABW continued for about 5 two moorings, with 1 month delay western site further downstream. Ship‐based hydrographic data are agreement, detecting westward spread new over...
Abstract The Antarctic continental margin supplies the densest bottom water to global abyss. From late twentieth century, an acceleration in long-term freshening of Bottom Waters (AABW) has been detected Australian-Antarctic Basin. Our latest hydrographic observations reveal that, 2010s, trend reversed broadly over slope. Near-bottom salinities 2018–2019 were higher than during 2011–2015. Along 170° E, salinity increase between 2011 and 2018 was greater that observed west. layer thickness...
The scattering of near‐inertial internal waves (NIIWs) induced at the tips landmasses was investigated by mooring observations using current meters and thermometers in surface layer along peninsulas an island located Japanese coast Japan Sea during fall 2006. Signals NIIWs were found alongshore currents temperatures recorded near seasonal thermocline. signals appeared after wind stress had reached a maximum, they lasted for more than 2 days. Relatively high energy regions due to localized...
Long-term water mass changes during 1994-2012 are examined from nine repeat hydrographic sections in the Seasonal Ice Zone along 140 E, off Antarctica.Significant freshening trends detected within most of masses bottom to surface.Bottom Water freshened by 0.008-0.009decade 21 below isopycnal surfaces and its layer thickness decreased 120-160 dbar decade throughout study period.In addition general thinning, was anomalously thin 2012, suggesting a possible link with sudden calving Mertz...
Abstract The climatological structure of the subpolar cyclonic circulation off East Antarctica is delineated with Argo float data from past decade. Up to 40% profiles in seasonal ice zone have been without satellite positioning. We refined their position as following bathymetry get appropriate positions continental margin. error terrain‐following interpolation was estimated by using positioned be 23 ± 27 (78 70) km for 90 (390) day period. Profiles under‐ice period shorter than 360 days are...
Abstract We investigated dynamic ocean topography (DOT) to reveal the oceanic subpolar circulation and possible pathway of modified Circumpolar Deep Water (CDW) in Indian Ocean sector Southern Ocean. Satellite radar altimeter data sets were employed develop monthly DOT both open water ice‐covered areas throughout course a year. A 0.2° × gridded was reconstructed for investigation structure at fine scale. The exhibited “cyclonic eddy train” consisting Vincennes eddy, Poinsett Sabrina eddies....
Abstract The generation of trapped and radiating internal tides around Izu‐Oshima Island located off Sagami Bay, Japan, is investigated using the three-dimensional Stanford Unstructured Nonhydrostatic Terrain-following Adaptive Navier–Stokes Simulator (SUNTANS) that validated with observations isotherm displacements in shallow water. model forced by barotropic tides, which generate strong baroclinic study region. Model results showed when diurnal K 1 dominate, resonance a Kelvin wave leads...
Abstract Recently, a source of Antarctic Bottom Water (AABW) was identified off Cape Darnley at the eastern end Weddell‐Enderby Basin. However, behavior and long‐term variability (CDBW) are not clearly understood. Hydrographic observations from 1974 to 2016 were compared, decade‐long bottom temperature record analyzed clarify multidecadal changes in CDBW this region its downstream influences. In Cooperation Sea, spread northwestward with deepest part reaching approximately 4,900 dbar....
Abstract The mixing process associated with modified Shelf Water (mSW) overflows that eventually mix to form Cape Darnley Bottom (CDBW) was investigated by hydrographic and microstructure observations off the Polynya (CDP), East Antarctica, in January 2009. Closely spaced revealed mSW properties varied considerably within a distance of ∼4 km across shelf edge. Near bottom, rate turbulent kinetic energy dissipation enhanced values greater than 10 −7 W kg −1 , vertical scale bottom boundary...
We examined the data obtained by acoustic Doppler current profiler, conductivity‐temperature‐depth and expendable bathythermograph observations, which were collected in summers of 2000, 2001, 2002, to clarify characteristics cold‐water belt (CWB), i.e., lower‐temperature water than surrounding extending from southwest coast Sakhalin along offshore side Soya Warm Current (SWC) confirm one formation mechanisms CWB as suggested our previous study, upwelling due convergence bottom Ekman...
Abstract Antarctic Bottom Water formation, which ventilates the abyssal layers of Southern Ocean, is an integral component global ocean meridional overturning circulation. Considering evident freshening and density decreases in source waters, widespread warming Ocean suggests a weakening supply. We demonstrate that robust based on water mass deep Australian-Antarctic Basin, remained after removing southward shift effect Circumpolar Current Front. Moreover, decrease apparent oxygen...