A5066818088- Climate variability and models
- Meteorological Phenomena and Simulations
- Hydrology and Watershed Management Studies
- Precipitation Measurement and Analysis
- Soil Moisture and Remote Sensing
- Cryospheric studies and observations
- Tropical and Extratropical Cyclones Research
- Flood Risk Assessment and Management
- Geology and Paleoclimatology Research
- Geophysics and Gravity Measurements
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Hydrology and Drought Analysis
- Soil and Unsaturated Flow
- Plant Water Relations and Carbon Dynamics
- Hydrological Forecasting Using AI
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Tree-ring climate responses
- Arctic and Antarctic ice dynamics
- Atmospheric Ozone and Climate
- Groundwater flow and contamination studies
- Urban Heat Island Mitigation
- Climate change impacts on agriculture
- Geophysical Methods and Applications
- Irrigation Practices and Water Management
Japan Meteorological Agency
2016-2025
Meteorological Research Institute
2016-2025
The University of Tokyo
1995-2020
Scripps Institution of Oceanography
2004
University of California, San Diego
2004
Japan Society of Civil Engineers
2000
Advanced Institute of Industrial Technology
1997-2000
Tokyo University of Science
1997-2000
The Japan Meteorological Agency (JMA) has developed the third Japanese global atmospheric reanalysis, Reanalysis for Three Quarters of a Century (JRA-3Q). objective JRA-3Q is to improve quality in terms issues identified previous 55-year (JRA-55) and extend reanalysis period further into past. based on TL479 version JMA Numerical Weather Prediction (NWP) system as December 2018 uses results developments operational NWP system, boundary conditions, forcing fields achieved at since JRA-55. It...
Abstract To evaluate the impacts of global warming on local‐scale extreme precipitation in Japan, 720‐year ensemble dynamical downscaling is conducted by a regional climate model with 5 km grid spacing. Our based large data set called database for Policy Decision making Future change (d4PDF). Comparing historical and 4K climates, annual maximum daily hourly are enhanced over Japan due to warming. The increasing rate larger coast Pacific Ocean eastern western northern parts Japan. periods...
Future Greenland temperature evolution will affect melting of the ice sheet and associated global sea-level change. Therefore, understanding variability its relation to trends is critical. Here, we reconstruct last 1,000 years central surface from isotopes N2 Ar in air bubbles an core. This technique provides constraints on decadal centennial fluctuations. We found that northern hemisphere changed synchronously at periods ~20 40–100 years. quasi-periodic multi-decadal fluctuation persisted...
[1] Two 25 year time-slice experiments were conducted using a 20 km mesh global atmospheric model, one for the present (1979–2003) and other future (2075–2099). To assess uncertainty of climate change projections, we performed ensemble simulations with 60 model combining 4 different sea surface temperatures 3 initial conditions. Horizontal resolution these models is higher than or comparable to that regional applied South American projections. Both reproduce sufficiently well observed...
Abstract Large ensemble pairs of high‐resolution global and regional climate simulations, which are composed 100 members 60 years each, make it possible to attribute changes in local‐scale heavy precipitation historical warming. Mountain ranges separate local climates can modulate the impact warming on precipitation. In summer, Japan's Kyushu region, with mountain approximately 200‐km long from south north, receives large amounts Over western Kyushu, monthly maximum daily ( maxPr ) July...
Impacts of historical warming on extremely heavy rainfall induced by Typhoon Hagibis (2019) are investigated using a storyline event attribution approach with the Japan Meteorological Agency Nonhydrostatic Model (JMA-NHM). Control experiments based JMA mesoscale analysis data well reproduce typhoon's track, intensity, and precipitation. First, two non-warming conducted: One excludes both 40-year atmospheric oceanic temperature trends from 1980 to 2019, other trend only. A comparison between...
Abstract. Two international projects, ISIMIP (Inter-Sectoral Impact Model Intercomparison Project) and CORDEX (Coordinated Regional Climate Downscaling Experiment), have been established to assess the impacts of global climate change improve our understanding regional respectively. selection from GCMs (general circulation models) within CMIP5 (fifth phase Coupled was conducted using different approaches for each project: one is a globally consistent model subset used in other region-specific...
Abstract. The surface temperature of the Greenland ice sheet is among most important climate variables for assessing how change may impact human societies due to its association with sea level rise. However, causes multidecadal-to-centennial changes in temperatures are not well understood, largely owing short observational records. To examine these, we calculated anomalies (GTA[G-NH]) over past 800 yr by subtracting standardized northern hemispheric (NH) from temperature. This decomposes...
Abstract This study used an atmospheric general circulation model (AGCM) with a 20‐km grid spacing and global river routing 0.5° resolution to project climatological mean discharges in the late 21st century under changing climate. We also performed ensemble simulation same AGCM except of 60 km forced different lower boundary conditions quantify level confidence projections. By century, projected annual increased high latitudes India southeastern United States but decreased broad regions...
Local climate influences of inland water bodies, complex topography, and surrounding seas cause temperate, arid, continental properties to prevail with local variations in different parts Turkey. The intra-regional variability environmental factors creates uncertainties challenges modeling. Multi-model ensemble analysis is suggested be used characterize the minimize generalization error projections. This study part a research on change impacts Turkey, focusing surface air temperature through...
ABSTRACT Dynamical downscaling (DDS) datasets play a crucial role in understanding regional climate patterns and extreme weather events. This study evaluates the reproducibility of indices Japan using two DDS based on JRA‐55 reanalysis for period 1979–2012. A total 48 were analysed to assess biases, interannual variability, trends precipitation temperature by comparing with AMeDAS observations, high‐resolution automated meteorological observation network Japan. Both reasonably captured...
Abstract Land cover classification is a fundamental and vital activity that helpful for understanding natural dynamics the human impacts of land surface processes. Available multiple 1-km global datasets have been compared to identify accuracy uncertainties vegetation types, but they not adequately water-related types. Six were comprehensively examined by focusing on three types (snow ice, wetlands, open water). The mean per-pixel agreement measured class-specific consistency high snow...
This work analyzes hydroclimate projections in Panama toward the end of 21st century by employing MRI-AGCM3.1 model. Understanding impact climate change on water resources is fundamental for a number economic activities (i.e. Canal operation, hydropower generation, and agriculture). Therefore, it important to assess hydroclimatic impacts specific basins using reliable Atmospheric Global Circulation Models (AGCMs) validated against actual field data. A 20-km mesh experiment was developed...
Abstract We examine the potential of assimilating river discharge observations into atmosphere by strongly coupled river‐atmosphere ensemble data assimilation. The Japan Meteorological Agency's Non‐Hydrostatic atmospheric Model (JMA‐NHM) is first with a simple rainfall‐runoff model. Next, local transform Kalman filter used for this model to assimilate variables JMA‐NHM variables. This system makes it possible do hydrometeorology backward, i.e., inversely estimate conditions from information...
We investigate regional characteristics of future changes in snowfall Japan under two emission scenarios—RCP2.6 and RCP8.5—using a high-resolution climate model with 5km grid spacing discuss the influence atmospheric circulation. The can simulate details distributions total Japan. Under RCP2.6, annual decreases most parts except for Japan's northern island, Hokkaido. In Hokkaido, winter increases even RCP8.5, especially January February. peak is delayed from early December to late Along Sea...
We projected future river discharge in the Chao Phraya River basin and evaluated uncertainty climate projections by using different resolutions ensemble experiments of Atmospheric General Circulation Model Meteorological Research Institute (MRI-AGCM). also obtained estimates precipitation, evaporation, runoff, under conditions for late 21st century. The results show that precipitation is to significantly increase during April August, excluding May. at Nakhon Sawan located central region...
Abstract The abrupt Northern Hemispheric warming at the end of twentieth century has been attributed to an enhanced greenhouse effect. Yet Greenland and surrounding subpolar North Atlantic remained anomalously cold in 1970s early 1990s. Here we reconstructed robust temperature records (North Ice Core Project Sheet 2) over past 2100 years using argon nitrogen isotopes air trapped within ice cores show that this anomaly was part a recursive pattern antiphase responses solar variability with...
This study projects the hydrological cycle in Tana River Basin, Kenya, under a changing climate due to anthropogenic greenhouse gas emissions late 21st century, using 20-km mesh atmospheric global model (AGCM) and 0.5°–mesh river-routing model. In addition, 60-km AGCM ensemble experiments forced with four different projected sea-surface temperatures were performed quantify uncertainty projections. All climatological annual mean hydroclimate variables: precipitation, evaporation, total...
Heavy precipitation in Japan is caused by various phenomena, such as tropical cyclones and the Baiu front, shows regional-scale variation. Here we investigate extremely heavy events exceeding 100-year return period Kanto area future projections of using large ensemble climate simulations for periods several thousand years. To understand these extreme events, associated sea level pressure anomalies over surrounding region are classified into four clusters. These cluster means characterized...
Abstract We investigate historical regional climate changes in Japan from 1959 to 2020, analyzing a high-resolution dynamical downscaling forced by the Japanese 55-year Reanalysis (JRA-55). One-year continuous simulations are conducted non-hydrostatic model with land surface that includes snow accumulation process, which enables us evaluate seasonal variation of cover all Japan. Our simulation reproduces interannual variations annual mean air temperature and total precipitation, it shows...
Abstract The present study investigated the onset and withdrawal dates of rainy season in Panama by using newly developed, gridded, daily precipitation datasets with a high horizontal resolution 0.05° based on ground observations. showed very complicated geographical features, although country is oriented parallel to latitude lines, patterns could simply reflect latitudinal migration intertropical convergence zone, as seen other regions countries. An absolute threshold value 3 mm day−1...