A5085331056- Arctic and Antarctic ice dynamics
- Climate variability and models
- Climate change and permafrost
- Cryospheric studies and observations
- Meteorological Phenomena and Simulations
- Oceanographic and Atmospheric Processes
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Ocean Waves and Remote Sensing
- Marine and coastal ecosystems
- Geological Studies and Exploration
- Tropical and Extratropical Cyclones Research
- Marine and environmental studies
- Precipitation Measurement and Analysis
- Food Industry and Aquatic Biology
- Glaucoma and retinal disorders
- Icing and De-icing Technologies
- Air Traffic Management and Optimization
- Arctic and Russian Policy Studies
- Ocean Acidification Effects and Responses
- Ionosphere and magnetosphere dynamics
- Marine and Coastal Research
National Institute of Polar Research
2016-2025
The Graduate University for Advanced Studies, SOKENDAI
2014-2025
Japan Agency for Marine-Earth Science and Technology
2012-2024
Research Organization of Information and Systems
2022
Prefectural University of Kumamoto
2016
Georgia Institute of Technology
2003-2005
Inouye Eye Hospital
2004
Japan Aerospace Exploration Agency
2004
Hokkaido University
1999-2003
Hirosaki University
1999
Influence of low Arctic sea‐ice minima in early autumn on the wintertime climate over Eurasia is investigated. Observational evidence shows that significant cold anomalies Far East winter and zonally elongated from Europe to late are associated with decrease cover preceding summer‐to‐autumn seasons. Results numerical experiments using an atmospheric general circulation model support these notions. The remote response regarded as a stationary Rossby wave generated thermally through anomalous...
Abstract Sea ice variability over the Barents with its resultant atmospheric response has been considered one of triggers unexpected downstream climate change. For example, East Asia experienced several major cold events while underlying temperature Arctic risen steadily. To understand influence sea in on circulation during winter from a synoptic perspective, this study evaluated cyclone activities respect to variability. The composite analysis, including all Nordic seas, revealed that an...
With the Arctic rapidly changing, needs to observe, understand, and model changes are essential. To support these needs, an annual cycle of observations atmospheric properties, processes, interactions were made while drifting with sea ice across central during Multidisciplinary Observatory for Study Climate (MOSAiC) expedition from October 2019 September 2020. An international team designed implemented comprehensive program document characterize all aspects system in unprecedented detail,...
Abstract The polar regions have been attracting more and attention in recent years, fueled by the perceptible impacts of anthropogenic climate change. Polar change provides new opportunities, such as shorter shipping routes between Europe East Asia, but also risks potential for industrial accidents or emergencies ice-covered seas. Here, it is argued that environmental prediction systems are less developed than elsewhere. There many reasons this situation, including being (historically) lower...
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...
Abstract The impact of Arctic radiosonde observations on the forecasting 2012 early August cyclone AC12—the “strongest” since records began—has been investigated using an observing system experiment (OSE). An atmospheric ensemble reanalysis (ALERA2) was used as control (CTL) to reproduce development and surrounding large‐scale fields. OSE applies same CTL except for exclusion from German icebreaker Polarstern , which cruised near Svalbard during mid‐July 2012. Comparison two reanalyses...
Abstract During ice-free periods, the Northern Sea Route (NSR) could be an attractive shipping route. The decline in Arctic sea-ice extent, however, associated with increase frequency of causes severe weather phenomena and high wind-driven waves advection sea ice make ship navigation along NSR difficult. Accurate forecasts are desirable for safe navigation, but large uncertainties exist current forecasts, partly owing to sparse observational network over Ocean. Here, we show that...
Abstract Measurements of refractory black carbon (rBC) aerosol particles using a highly sensitive online single particle soot photometer were performed on board the R/V Mirai during cruise across Arctic Ocean, Bering Sea, and North Pacific Ocean (31 August to 9 October 2014). The measured rBC mass concentrations over in latitudinal region > 70°N range 0–66 ng/m 3 for 1 min averages, with an overall mean value 1.0 ± 1.2 . Single‐particle‐based observations enabled measurement such low...
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 The Year of Polar Prediction in the Southern Hemisphere (YOPP-SH) had a special observing period (SOP) that ran from 16 November 2018 to 15 February 2019, chosen span austral warm season months greatest operational activity Antarctic. Some 2,200 additional radiosondes were launched during 3-month SOP, roughly doubling routine program, and network drifting buoys Ocean was enhanced. An evaluation global model forecasts SOP using its data has confirmed extratropical forecast skill lags...
Abstract. The Arctic climate system is rapidly transitioning into a new regime with reduction in the extent of sea ice, enhanced mixing ocean and atmosphere, thus coupling within ocean–ice–atmosphere system; these physical changes are leading to ecosystem Ocean. In this review paper, we assess one critically important aspects regime, variability freshwater, which plays fundamental role by impacting stratification ice formation or melt. Liquid solid freshwater exports also affect global...
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...
Leads play an important role in the exchange of heat, gases, vapour, and particles between seawater atmosphere ice-covered polar oceans. In summer, these processes can be modified significantly by formation a meltwater layer at surface, yet we know little about dynamics persistence. During drift campaign Multidisciplinary drifting Observatory for Study Arctic Climate (MOSAiC), examined how variation lead width, re-freezing, mixing events affected vertical structure waters during late summer...
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...
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...
Abstract A fixed‐point observation station was set up in the northern Chukchi Sea during autumn 2013, and for about 2 weeks conductivity‐temperature‐depth (CTD)/water samplings (6 h) microstructure turbulence measurements (2 to 3 times a day) were performed. This enabled us estimate vertical nutrient fluxes impact of different types turbulent mixing on biological activity. There have been no such observations this region, where incoming low‐salinity water from Pacific Ocean, river water,...
Uncertainties in weather and sea-ice forecasts must be taken into consideration Arctic shipping. The changing Ocean is characterized by diminishing extent. Extremely developed cyclones, unexpectedly high ocean waves, rapid drift make navigation difficult. How state-of-the-art produced operational centers can used correctly effectively end users (e.g., ship crews operation companies) an emerging issue. In this synthesis paper, characteristics of the predictabilities weather, sea ice, waves...
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)...
[1] Rapid sea-ice retreat over the Arctic Ocean has a leading role in amplification. The extent dramatically recovers during every freezing season, so despite recent summer retreat, there must be extraordinary heat exchange between lower atmosphere and upper ocean. However, underlying mechanisms for this remain uncertain. Here we show that autumn frontal cyclogenesis is crucial event air-sea coupled system. Our shipboard Doppler radar intensive radiosonde observations at marginal ice zone...
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...