A5102838135- Cryospheric studies and observations
- Landslides and related hazards
- Isotope Analysis in Ecology
- Winter Sports Injuries and Performance
- Geology and Paleoclimatology Research
- Coral and Marine Ecosystems Studies
- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Marine and fisheries research
- Groundwater and Isotope Geochemistry
- Oceanographic and Atmospheric Processes
- Climate change and permafrost
- Marine Bivalve and Aquaculture Studies
- Turtle Biology and Conservation
- Marine animal studies overview
- Urban Heat Island Mitigation
- Marine and coastal plant biology
- Methane Hydrates and Related Phenomena
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Aeolian processes and effects
- Spacecraft and Cryogenic Technologies
- Advanced Chemical Sensor Technologies
- Aquaculture Nutrition and Growth
- Remote Sensing and Land Use
Nagoya University
2013-2024
Japan Fisheries Research and Education Agency
2002-2021
National Research Institute for Earth Science and Disaster Resilience
2009-2019
Graduate School USA
2019
Shimizu (Japan)
2017
Tokyo University of Agriculture and Technology
2015
Rikkyo University
2015
Sophia University
2013
Students on Ice
2009-2011
Hokkai Gakuen University
2009
The magnesium-to-calcium (Mg/Ca) ratio of coral skeletons from Ishigaki Island, Ryukyu Islands, Japan, closely tracked sea surface temperature (SST) over an 8-year period. Measurements were made with the fast technique inductively coupled plasma-atomic emission spectrometry. variation Mg/Ca SST change is about four times that current, widely used strontium-to-calcium ratio. temporal and geographic seawater Mg2+/Ca2+ probably has little influence on variation. Results indicate potential to...
Daily precipitation samples for stable isotope analysis were collected throughout 2003 at Dome Fuji Station, inland East Antarctica. Stable isotopes show significantly depleted values with a large seasonal variability, which have never been obtained. Temporal changes in δ ‐T relation and d‐excess are consistent those found geographical distribution. Precipitation was obtained almost everyday, though the amounts quite small (27.6 mm water equivalent (w.e.) annual total 0.08 w.e. daily...
Recently, an excess of 17 O ( O‐excess) has been demonstrated in meteoric water and ice cores. Based on theory experiments, it suggested that this originates from evaporation ocean into under‐saturated air. However, there never direct demonstration marine vapor. Here, we present results the first measurements δ 18 vapor samples collected over South Indian Southern Oceans. Our data show existence O‐excess also clear negative correlation between relative humidity. Thus, is useful for...
Abstract There is growing evidence that small‐scale, coastal, passive net fisheries may be the largest single threat to some sea turtle populations. We review assessments of interactions in these fisheries, and experiments on gear‐technology approaches (modifying gear designs, materials fishing methods) mitigate by‐catch, available from a small number studies fisheries. Additional are needed improve limited understanding relative degree risk coastal pose populations, prioritize conservation...
Pacific bluefin tuna (PBF), Thunnus orientalis (Temminck and Schlegel, 1844), is highly migratory capable of traversing large distances throughout the North Ocean. The majority spawning activity has been reported only from Sea Japan western parts We have conducted larval surveys in these areas since 2009 (late period), used generalized additive models (GAM) with presence/absence data to analyze distribution respect oceanographic conditions, such as sea surface temperature chlorophyll-a...
Seasonal sea surface salinity (SSS) records can be of great value in reconstructing El Niño/Southern Oscillation (ENSO) variability the equatorial Western and Central Pacific, a region where ENSO‐related evaporation precipitation (E‐P) changes are dramatic. The δ 18 O values coral skeleton (δ ) reflect seawater changes, which tropical oceans also generally influenced by E‐P changes. Therefore, is good indicator rainfall ENSO variability. We present biweekly data from Palau, northern part...
We assessed marine reservoir age R(t) for the costal area of northwest Pacific using radiocarbon measurements annually banded coral core ( Porites sp) collected on Ishigaki Island in southern Japan. Reservoir during early 1900s at coast ranged between 290 and 455 14 C yr, with a weighted mean 355 ± 25 yr (n=5, ±1 σ). The regional-specific ΔR, defined as difference regional world ocean surface layer, was 35 ±1σ) average increased 1900 1950.
Abstract Coupled records of Sr/Ca and oxygen isotope ratios (δ 18 O) coral skeletons have been used to produce quantitative estimates paleo-sea surface temperature (SST) δ O seawater that can in some cases be converted sea salinity (SSS). Two fossil corals from Kikai Island the subtropical northwestern Pacific, a location affected by East Asian summer winter monsoons, were analyzed investigate differences between mid-Holocene present-day SST SSS. At 6180 cal yr BP, SSTs roughly same as...
Abstarct Meteorological data from mountainous areas of Japan have been collected by the National Research Institute for Earth Science and Disaster Prevention (NIED) almost 20 years. The long-period indicate that neither a notable increase in mean winter temperature nor reduction snow depth has occurred these areas. maximum depth, SD max , water equivalent, SWE show similar fluctuation trends, although with large year-to-year variations value larger range than . This result suggests...
Abstract Strong ground motions caused by earthquakes can induce catastrophic avalanches. Massive snow avalanching has also been observed on slopes near quarries and underground mines where are produced explosives. To address a lack of information regarding seismogenic avalanches, we have compiled an inventory to document case histories. For the period 1899–2010, 22 cases identified worldwide, related natural or artificial seismicity with magnitudes 1.9 ≤ M w 9.2 source-to-site distances...
The present study used otolith analysis-based body size back-calculation to: (1) evaluate the hypothesis of growth-dependent survival in young Pacific bluefin tuna (PBF; Thunnus orientalis) from north-western Ocean; (2) identify critical developmental stages for survival; and (3) compare interannual differences early growth. To this end, we compared daily growth trajectories a large number larvae (standard length (SL) <15mm), juveniles (15≤SL≤150mm), young-of-year (YOY; SL >150mm)...
Aerosol samples, which are dust suspended in the atmosphere, were collected Qira, Aksu, and Shapotou 2001 Dunhuang 2002, located between north-western central China, one of possible source areas Asian dust. Their chemical isotopic compositions, mainly Sr Nd total particles (TSP) finer fraction (ψ < 5 μm) TSP analysed. There is a slight difference compositions ψ μm that can probably be attributed to relative increase silt and/or clay fraction. 87Sr/86Sr ratios 0.71770-0.72030 0.72349-0.72737...