• Wave Modeling
  • EIA
  • Air Pollution
  • Climate Change

Ocean wave hindcast database

In general, steady observations over a long time are necessary for wave characteristic surveys for a given ocean area. However, observed values based on such observations are limited. In recent years, it has become possible to obtain estimated wave values with high spatial and temporal resolution. JWA has developed two types of wave hindcast databases based on a unique wave estimation model where meteorological re-analysis values are used as input data.

Specifications for the ocean wave hindcast database

  Global ocean hindcast database Ocean wave hindcast database around Japan
Coverage area Global
Longitudes: 0 to 180E and 0 to 180W
Latitudes: 75S to 75N
Around Japan
Longitudes: 120E to 150W
Latitudes: 20N to 50N
Spatial resolution 0.5 degree ≒ 50 km 1/30 degree ≒ 3.7 km
Period 1951 to present 2001 to present
Temporal resolution 1 hour
Elements Significant wave height, significant wave period and wave direction,Wind direction and wind velocity (at 10m height)


The quality of the data has been improved by verifying with observation data. We can provide the data of an arbitrary point and term. Furthermore, we can help your analyzing works as shown below.

Distribution map of wave height

Frequency distribution of wave appearances

Intended purposes

Review of conditions for oceanographic phenomena for constructing nearshore/offshore facilities, e.g. design waves.

Calmness assessment for ports, harbors and coasts

Survey on potential quantity of the ocean energy.

Probability occurrence of waves on shipping route

Environmental assessments

The JWA supports environmental assessment procedures based on abundant past performance and the latest technological methods. Environmental assessments survey, predict and assess beforehand the impacts that development activities are anticipated to have on the environment. These results are published and opinions from stakeholders such as surrounding residents are heard. Based on such opinions, the creation of better business plans from the perspective of environmental conservation is supported. The JWA has supported many environmental assessments in a variety of business sectors, such as thermal power plants, railways, waste disposal and treatment facilities, etc., starting in the initial period that the environmental assessment system was introduced in Japan. In the sector of atmospheric pollution in particular, such assessments have also been used for dispersion prediction of complex terrain using technologies such as dispersion experiments and wind tunnel experiments. The JWA also accompanies business operators when they hold explanatory meetings with residents, which they are particularly concerned about.


Abundant experience from the initial stage of introduction of the environmental assessment system in the 1970s

Based on technological methods such as dispersion experiments and wind tunnel experiments, the JWA supports business operators at various stages, from conducting surveys, forecasts and assessments, to coordinating residents.

Outline diagram of dispersion experiment

Wind tunnel experiment

Intended purposes

Support procedures for legal assessments, assessments based on ordinances, voluntary assessments, etc. in Japan, as well as environmental assessments that are adapted to the circumstances in each country

Survey on atmospheric pollution (simulation)

The JWA surveys and predicts air pollutants based on air environment simulations that take even cross-border pollution from other countries into consideration. Air pollution caused by photochemical oxidants and PM2.5 are associated with complex chemical reactions in the atmosphere. Thus, surveys and predictions using an atmospheric environment model based on analytical solutions were difficult. As a result, the JWA introduced an atmospheric environment model based on numerical solutions, starting with the CMAQ, and is conducting simulations of atmospheric pollution. By using simulation results, the state of atmospheric pollution and the effects of environmental improvement measures are quantitatively evaluated.


Introduction of the latest atmospheric environment models based on coordinating with other research institutions and universities

Research and development for higher accuracy of the atmospheric environment model

Example of simulation of photochemical oxidant concentration

Measurement results for concentration,
wind direction and wind velocity,

Calculation results using simulation model

Intended purposes

Prediction of PM2.5 concentration distribution

Review of optimal positioning of air pollution monitoring stations

Review of effects of reducing NOx-VOC emissions amount on the concentration of photochemical oxidants

Source contribution analysis of air pollutants

Mitigation and Adaptation Strategies for Climate Change

The JWA has been engaged in tackling climate change problems for many years, making use of its specialized knowledge in meteorology. With its abundant past experience, the JWA has been implanting a variety of services. These services include surveys and research related to influence prediction, mitigation and adaptation strategies for climate change; surveys related to CDM and new mechanisms (JCM) promoted by the Japanese government; construction of MRV methodology, calculation of greenhouse gas emission reductions, and support of expert committees such as the IPCC.
As a concrete example for a verification study of the JCM model, a project for reducing GHG emissions, by realizing a modal shift from automobiles to railways in the Bangkok Metropolitan Region, Thailand, where there is heavy traffic congestion, was implemented. In this project, MRV methodology was constructed and verified.

Pattern diagram of GHG emission reduction based on a modal shift from automobiles to railways

Traffic in Bangkok

Railway station


Influence prediction for climate changes using abundant knowledge related to the weather, environment, disaster prevention, ocean, etc.

Proposal of climate change mitigation and adaptation strategies that are optimal for the region in various sectors such as renewable energy, agriculture, transportation, etc.

Intended purposes

CDM and JCM project feasibility studies

Support for review and planning of climate change control measures (mitigation strategies, adaptation strategies)

Support for international expert committees such as IPCC

Explanation of terms

Mitigation strategies for climate change:

Strategies that mitigate the progress of global warming and stabilize the GHG concentration in the atmosphere by reducing GHG emissions through business activities, etc.

Adaptation strategies for climate change:

Strategies for adapting to abnormal weather caused by global warming by developing social infrastructure, etc.