A5101477227- Cryospheric studies and observations
- Climate change and permafrost
- Hydrology and Watershed Management Studies
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Groundwater and Isotope Geochemistry
- Winter Sports Injuries and Performance
- Atmospheric chemistry and aerosols
- Smart Materials for Construction
- Soil and Water Nutrient Dynamics
- Meteorological Phenomena and Simulations
- Polar Research and Ecology
- Climate variability and models
- Karst Systems and Hydrogeology
- Isotope Analysis in Ecology
- Plant Ecology and Soil Science
- Marine and coastal ecosystems
- Flood Risk Assessment and Management
- Water Quality and Pollution Assessment
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Atmospheric aerosols and clouds
- Urban Stormwater Management Solutions
- Ecology and Conservation Studies
- Radioactive contamination and transfer
Shinshu University
2015-2024
Ōtani University
2006-2023
Shinshu University Hospital
2008-2022
Tokyo Metropolitan University
1987-2019
Kokushikan University
2019
University of Tsukuba
2013
Agriculture, Forestry and Fisheries Research Council
1979
Ministry of Agriculture Forestry and Fisheries
1979
Global cooling in intermediate glacial climate with northern ice sheets preconditions climatic instability bipolar seesaw.
Fatty acids (C 14 –C 32 ) in the marine boundary layer were measured aerosols that collected over northern North Pacific from October 1996 to June 1997. Concentrations of lower molecular weight 19 saturated fatty (LFAs, 0.8–24 ng m −3 showed a positive correlation with sea‐salt concentrations, suggesting LFAs are released ocean surface atmosphere particles. The averaged ratios [LFAs] air /[sea salt] autumn, winter, spring and summer seasons 1.8 (±1.3) × 10 −4 , 2.1 3.7 (±2.9) 4.6 (±1.8)...
The δD temperature proxy in Antarctic ice cores varies parallel with CO2 through glacial cycles. However, these variables display a puzzling asynchrony. Well-dated records of Southern Ocean will provide crucial information because the is likely key regulating variations. Here, we perform multiple isotopic analyses on an core and estimate variations at this site oceanic moisture source over past 720,000 years, which extend longest by 300,000 years. affected large local insolation that are...
Marine biogenic sulphur affects Earth's radiation budget and may be an indicator of primary productivity in the Southern Ocean, which is closely related to atmospheric CO2 variability through biological pump. Previous ice-core studies Antarctica show little climate dependence marine emissions hence productivity, contradictory sediment records. Here we present new 720,000-year ice core records from Dome Fuji East that a large portion non-sea-salt sulphate, was traditionally used as proxy for...
The 15 N‐enrichment of plants and soils is believed to indicate characteristics the open nitrogen (N) cycle in terrestrial ecosystems because N lost from an ecosystem presumably N‐depleted through isotopic fractionation. However, a lack appropriate analytical methodology confirm that supposition, δ value for total dissolved (TDN, sum ammonium, nitrate, organic N) stream water forests has been measured only rarely. This report describes values TDN, nitrate precipitation water, together with...
Current parametrization of cloud–aerosol interactions nascent sea-spray aerosols (SSA) in the climate models is hampered by our limited understanding constituents organic aerosols. We investigated here mass concentrations, molecular distributions, and relative abundances hydroxy fatty acids (FAs), ubiquitous lipid compounds SSA collected over western Pacific Ocean (35°N–40°S). Detectable levels methanesulfonic acid (an oxidation product dimethyl sulfide) high enrichment factors Mg2+ Ca2+ to...
In association with the September 2014 phreatic eruption (VEI 1–2) at Ontake Volcano, a syn-eruptive and two post-eruptive lahars occurred in Akagawa–Nigorigawa River, southern flank of volcano. The present contribution describes discusses contrasting features lahars, which caused major impact on downstream river morphology, re-examines description lahar previous study. first 8 days after by rainstorm (October 5, 2014, before snowy season), second was associated rain-on-snow (ROS) event...
Abstract. We found extremely good synchronization of volcanic eruption signals between a shallow ice core drilled at Dome Fuji in 2001 (DF01 core) and the B32 from Dronning Maud Land, East Antarctica. then applied signature matching to transfer chronology constructed by annual layer counting portion DF01 for which was difficult because low precipitation rate. Matching done careful comparison non-sea-salt sulfate (nssSO42−) data, have temporal resolution about 1 yr, cores. The newly obtained...
Precipitation isotope maps over mountains are critical for water resource assessment, yet isoscape modeling has been minimally investigated complex terrain with high relief. Here we show that multiannual (2011–2015) mean precipitation isoscapes across the Japanese Alps region can be represented by simple multiple-regression models strong goodness of fit (R2 = 0.928 δ2H and 0.944 δ18O). Reliability was further confirmed agreement previously reported independent data throughout a wider range...
Ice cores from temperate regions have long been expected to be useful for understanding local climate trends, but a reliable dating method has proved difficult. Here we show that measurements of pollen using samples with only 10 mL water can give an accurate measure the annual ice accumulation. In addition, two major types allow us estimate summer accumulation as well
Abstract We examined microorganisms and pollen in a pit (4.5m deep) shallow ice core (25.01m long) from Sofiyskiy glacier the Altai mountains of Russia for potential use dating cores mid-latitude glacier. The ice-core samples contained various green algae, cyanobacteria, bacteria, fungi pollen. In vertical profiles pit, algal biomass peaks corresponded to high δ 18 O layers Pinaceae peaks, suggesting that these algae grew during melt season. contrast, layer with lowest almost no cells. Major...
Inter-annual variations of snowmelt runoff timing in 15 basins across central Japan were analyzed 30 years, from 1980–2009, to determine if mountain hydrology has been affected by global warming. Observed daily river discharge was utilized calculate center time (CT) mass flow. CT found be occurring significantly earlier the year at two northern basins, with a rate change around five days per decade. While decreasing trends other not significant, negative correlations between and winter...
Meteorological data collected at mountain sites during the period 2006–2010 were archived under Japanese Alps Inter-university Cooperative Project (JALPS). The site managers developed policy, and in situ with metadata sets from 28 observation prepared using a uniform format on home page. Surface temperature lapse rates, including 3000-m level station data, agreed previous results, which diurnal range varied depending location season. A preliminary analysis comparing reanalysis for wind speed...
The Japanese Alps collectively refer the Hida Mountains, Kiso and Akaishi ranging approximately 200 km north to south 100 east west. In terms of span, region includes Ryohaku Mountains west Mt. Fuji, Yatsugatake, Mikuni east, making geographical extent more than in east-west direction. maximum altitude is around 3000 m; however, climatic conditions vary widely because lies at center Honshu, between Japan Sea coast Pacific coast, northern area known experience one heaviest snowfalls world. It...
Mountainous areas are quite sensitive to global-scale environmental changes, such as warming. Therefore, the effect of global warming on these meteorological elements is a critical issue. However, Mt. Fuji Weather Station, which was once symbol observation in mountainous areas, has remained unmanned since August 2004. Of other sites Japan Meteorological Agency, Nobeyama, at 1350 m.a.s.l. elevation, highest. When evaluating effects event regional-scale change Japanese Alps high elevation...
Abstract To determine annual layers for reconstructing the past environment at resolution from ice cores, we employed snow-stake data back to 1972, tritium content, solid electrical conductivity measurements (ECM) and stratigraphic properties 73m core H72 site, east Dronning Maud Land, Antarctica. average surface mass balance is 307 mma –1 w.e. during last 27 years continuous accumulation data, 317 according densification model 311 167 based on annual-layer counting. ECM age closely...
Kamikochi area in the Japanese Northern Alps For mountains with high precipitation and hydraulic gradients, understanding hydrologic cycle is important for disaster prevention (i.e., floods landslides) water resource management. Mountainous regions an Asian monsoon climate have higher than other parts of world, runoff processes that accompany significant remain largely unresolved. We conducted hydrological observations to clarify process mountainous using difference characteristics between...
日本の気象官署109 地点の1962 ～ 2009 年の観測資料を整理・解析することで，累積降雪深が減少している地点の地域性について明らかにし，その地域性を与える要因についての考察を行った。 累積降雪深は，寿都で有意に増加しているが，東北地方の日本海側，北陸地方および西日本では有意に減少している。これらの地域は主に気温上昇による降水形態の変化が起こりやすい地域（降水遷移地域），または冬季平均気温が降水形態の雪/ 雨の判別気温よりも高い地域（温暖地域）である。 降水遷移地域では，累積降雪深の減少の有無は降雪をもたらす気象条件によって日本海側と太平洋側に分けられる。日本海側では，降雪はおもに冬季季節風によってもたらされるため，冬季の気温上昇によって降水形態の雪か雨かが変化することにより累積降雪深が有意に減少していると考えられる。...
Quinone-based aromatic compounds have been studied as electrode materials for various energy-storage devices. However, the relatively large activation barrier of charge-transfer process these redox-active molecules causes sluggish reactions and a decrease in energy efficiency. To lower barrier, must be strongly adsorbed on surface, preferably via π–π stacking interactions. Molecules slit-shaped micropores adsorb graphitic walls, thus experiencing unique micropore-confinement properties. In...
Understanding the mountain hydrological cycle, including runoff processes, is important for water-related disaster prevention. Although process of peak generation closely related to water hazards, this has not been clarified in alpine headwaters with large amounts precipitation. In study, we conducted observations clarify characteristics and factors that determine an headwater under Asian monsoon climate. Total precipitation during summer period (3 months) was 1581.4 mm, responded quickly...
Abstract The seasonal variation of the quality stream water in a snowy temperate area, where rain or temporary warming can cause frequent melting at surface snow cover, even mid‐winter, was studied. Monthly runoff is highest snowmelt seasons March and April, lowest November. Since floods rainy season autumn period take place irregularly, they contribute little to monthly runoff. In winter, as with season, proportion HCO 3 − relatively low, while proportions Cl , NO SO 4 2− are high....