A5050268965- Arctic and Antarctic ice dynamics
- Electrolyte and hormonal disorders
- Climate variability and models
- GNSS positioning and interference
- Meteorological Phenomena and Simulations
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Catalytic Processes in Materials Science
- Atmospheric chemistry and aerosols
- Neuroendocrine regulation and behavior
- Oceanographic and Atmospheric Processes
- Atmospheric aerosols and clouds
- Industrial Gas Emission Control
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Mobile Agent-Based Network Management
- Stress Responses and Cortisol
- Methane Hydrates and Related Phenomena
- Precipitation Measurement and Analysis
- Vehicle emissions and performance
- Ionosphere and magnetosphere dynamics
- Tropical and Extratropical Cyclones Research
- earthquake and tectonic studies
- Atmospheric Ozone and Climate
- Receptor Mechanisms and Signaling
The Graduate University for Advanced Studies, SOKENDAI
2014-2024
National Institute of Polar Research
2005-2024
Kitami Institute of Technology
2018-2022
Japan Agency for Marine-Earth Science and Technology
2012-2022
University of Tsukuba
2015-2018
Antarctic Climate and Ecosystems Cooperative Research Centre
2018
Japan Aerospace Exploration Agency
2014-2017
Tohoku University
1990-2015
Hirosaki University
2012-2015
Asahi General Hospital
1995-2015
Abnormal sea-ice retreat over the Barents Sea during early winter has been considered a leading driver of recent midlatitude severe winters Eurasia. However, causal relationships between such and atmospheric circulation anomalies remains uncertain. Using reanalysis dataset, we found that poleward shift sea surface temperature front Gulf Stream likely induces warm southerly advection consequent decline sector, cold anomaly Eurasia via planetary waves triggered region. The above mechanism is...
Abstract The Arctic is warming at more than twice the rate of global average. This influenced by clouds, which modulate solar and terrestrial radiative fluxes and, thus, determine surface energy budget. However, interactions among aerosols, in are still poorly understood. To address these uncertainties, Ny-Ålesund Aerosol Cloud Experiment (NASCENT) study was conducted from September 2019 to August 2020 Ny-Ålesund, Svalbard. campaign’s primary goal elucidate life cycle aerosols how they cloud...
The long-term trend of extreme ocean waves in the emerging ice-free waters summer Arctic is studied using ERA-Interim wave reanalysis, with validation by two drifting buoys deployed 2016. 38-year-long reanalysis dataset reveals an increase expected largest significant height from 2.3 m to 3.1 water Laptev Beaufort Seas during October. highly correlated highest wind speed 12.0 m/s 14.2 over ocean, and less so extent water. Since storms this area did not strengthen throughout analysis period,...
Abstract We investigate linear trends in Antarctic skin temperatures (temperatures from about the top millimeter of surface) over four seasons using ERA5 ensemble mean reanalysis data. During 1950–2020, statistically significant warming occurred East and West Antarctica spring, autumn winter, Peninsula winter. A surface energy budget analysis revealed that increases downward longwave radiation related to air temperature total column integrated cloud had a key role warming. There were...
Abstract Predictability of sea ice concentrations (SICs) in the Barents Sea early winter (November–December) is studied using canonical correlation analysis with atmospheric and ocean anomalies from NCEP Climate Forecast System Reanalysis (CFSR) data. It found that highest prediction skill for a single-predictor model obtained 13-month lead subsurface temperature at 200-m depth (T200) in-phase meridional surface wind (Vsfc). T200 skillfully predicts SIC variability 35% Sea, mainly eastern...
The observation of seafloor crustal deformation is very important to understand plate motions, nucleation processes and mechanisms great interplate earthquakes as well the activities submarine volcanoes. We have been developing an system for deformation. This consists two main components; (1) kinematic GPS positioning vessel (2) accurate acoustic measurements distances between a transponder attached on side (onboard station) one located ocean bottom (seafloor station). In this study, we...
Recent cold winter extremes over Eurasia and North America have been considered to be a consequence of warming Arctic. More accurate weather forecasts are required reduce human socioeconomic damages associated with severe winters. However, the sparse observing network Arctic brings errors in initializing prediction model, which might impact accuracy results at midlatitudes. Here we show that additional radiosonde observations from Norwegian young sea ICE expedition (N-ICE2015) drifting ice...
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Abstract The presence of clouds in the Arctic regulates surface energy budget (SEB) over sea‐ice and ice‐free ocean. Following several previous field campaigns, cloud‐radiation relationship, including cloud vertical structure phase, has been elucidated; however, modeling this relationship matured slowly. In recognition recent decline extent, representation system numerical models should consider effects areas covered by sea ice areas. Using an situ stationary meteorological observation data...
Abstract The Antarctic Peninsula of West Antarctica was one the most rapidly warming regions on Earth during second half 20th century. Changes in atmospheric circulation associated with remote tropical climate variabilities have been considered as leading drivers change surface conditions region. However, impacts over mid-latitudes Southern Hemisphere this yet to be quantified. Here, through observation analysis and model experiments, we reveal that increases winter sea temperature (SST)...
Sea ice growth is modulated by snow cover, and understanding this relationship requires an accurate determination of depth. However, a lack in situ measurements complicates the interaction depth with sea growth. We evaluated accuracy Climate Forecast System Reanalysis (CFSR) data for thickness to study change on Arctic ice. compared CFSR from 35 drifting buoys 2002–2013. The mean annual cycle corresponded well buoy data. had positive bias during winter (10–20 cm) spring (5–25 cm), negative...
Abstract. Constraints from ozone (O3) observations over oceans are needed in addition to those terrestrial regions fully understand global tropospheric chemistry and its impact on the climate. Here, we provide a large data set of carbon monoxide (CO) levels observed (for 11 666 10 681 h, respectively) oceans. The is derived made during 24 research cruise legs R/V Mirai 2012 2017, Southern, Indian, Pacific, Arctic oceans, covering region 67∘ S 75∘ N. suitable for critical evaluation...
Abstract This study investigated the impact of radiosonde observations from Southern Ocean obtained by Australian R/V Aurora Australis on ALERA2 experimental ensemble reanalysis data set and forecast experiment. An observing system experiment (OSE) that included additional ship‐launched captured atmospheric structure over Ocean. without radiosondes had positive temperature biases exceeding 7 °C in upper troposphere when low‐pressure cyclonic systems passed ship. The spread level was reduced...
This study assessed the possibility of producing profiles atmospheric parameters, including aerosol number concentration, using observations obtained by a conventional low-cost small rotary-wing Unmanned Aircraft Systems (UAS). A radiation shield for meteorological sensor was developed to reduce effects from heat exhaust both rotors and body UAS solar radiation. Field experiments in northern Japan during winter confirmed that continuous UAS-derived data lower boundary layer were quality...
Abstract The relationship between cloud phase, ice‐nucleating particles (INPs), and ocean state is vital in climate system modeling. High wave conditions induced by the Arctic sea‐ice decline intensified atmospheric forcing over ice‐free increase dynamical geochemical oceanic mixing sea spray supply containing organic substances, which could act as INPs promoting formation of lower tropospheric ice‐containing clouds. Here, we show that surface regulates INP concentration ice presence...
The ASTAR 2000 (Arctic Study of Tropospheric Aerosol and Radiation) campaign ran from 12 March until 25 April with extensive flight operations in the vicinity Svalbard (Norway) Longyearbyen airport (78.25°N, 15.49°E). It was a joint Japanese (NIPR Tokyo)–German (AWI Bremerhaven/Potsdam) airborne measurement using AWI aircraft POLAR 4 (Dornier 228-101). Simultaneous ground-based measurements were done at international research site Ny-Ålesund (78.95°N, 11.93°E) Svalbard, German Koldewey...
We installed two global navigation satellite system (GNSS) antennas on a research vessel, the RYOFU MARU of Japan Meteorological Agency, and conducted experimental observations to assess GNSS-derived precipitable water vapor (PWV) from October 19, 2016, August 6, 2017. One antenna was set mast (MAST), while another upper deck (DECK). The GNSS analysis using precise point positioning procedure with real-time orbit. A quality control (QC) based amount zenith tropospheric delay (ZTD) time...
Cloud‐base observations over the ice‐free Chukchi and Beaufort Seas in autumn were conducted using a shipboard ceilometer radiosondes during 1999–2010 cruises of Japanese R/V Mirai. In comparison with cloud‐base heights an ice‐covered case (the Surface Heat Budget Arctic Ocean project 1998), our results showed 30% decrease (increase) frequency low clouds ceiling below (above) 500 m. Temperature profiles revealed that boundary layer was well developed ocean 2000s, whereas stable dominated...
Due to the fact that it is difficult fulfill recent stringent regulations governing marine diesel engine emission by means of combustion improvement alone, an effective aftertreatment technology required achieve efficient simultaneous removal NO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> and particulate matter (PM). In present study, we designed investigated system employs a combination ozone injection nonthermal plasma (NTP)...
This work describes a system aimed at the near realtimemonitoring of precipitable water vapor (PWV) by means dense network Global Navigation Satellite System (GNSS) receivers. These receivers are deployed with horizontal spacing 1-2 km around Uji campus Kyoto University, Japan. The PWV observed using standard GPS meteorology technique, i.e., all satellites above low elevation cutoff, is validated against radiosonde and radiometer measurements. result RMS difference about 2 mm. A more...
The significant reduction of the sea ice extent in western Arctic has been observed by sustained satellite observations since 1979. opening ocean is now allowing waves to evolve and propagate under presence ice. A better understanding wave-ice interaction necessary for safe shipping over covered Ocean improve climate projection. During R/V Mirai Expedition October 2019, two drifting wave-buoys were concurrently deployed open marginal zone (MIZ) with grease pancake wave conditions at time...
To assess the central role of interleukin 1-beta (IL-1 beta) in release ACTH, vasopressin (AVP) and atrial natriuretic peptide (ANP) regulation blood pressure thermogenesis, 3 ng (0.173 pM) x 100-1 BW-1 (LIL), 30 (1.73 100g-1 (MIL), 150 (8.63 (HIL) human IL-1 beta dissolved sterile saline were injected intracerebroventricularly to conscious rats. In control rats, alone (5 microliters) was administered. three other groups, rats pretreated with indomethacin, a cyclooxygenase inhibitor, given...
As the regulations governing diesel engine emissions have become more stringent, it has difficult to fulfill these new requirements by only using techniques that improve combustion. Therefore, effective aftertreatment technology is needed, particularly for particulate matter. Although ceramic filter (DPF) a leading in automobiles, their implementation marine engines operated with oil (A-heavy fuel oil) containing sulfur presents problem, terms of soot removal or regeneration. In this study,...