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GOSAT-GW (Greenhouse Gases Observing Satellite Greenhouse gases and Water cycle), formerly known as GOSAT 3, is JAXA's next generation satellite to monitor the greenhosue gases like carbon dioxide in the Earth's atmosphere. It is the follow on to the GOSAT 2 (Ibuki 2) and GCOM-W (Shizuku) missions.

GOSAT-GW will have two missions: greenhouse gases observation for Japan's Ministry of the Environment and the National Institute for Environmental Studies (NIES), and water-cycle observation for JAXA. By developing the GOSAT-GW satellite, Mitsubishi Electric will contribute to measures for preventing disasters attributed to global warming and climate change, and to advance scientific and technological methods that enable more accurate prediction of climate change.

GOSAT 2 features two instruments:

  • Total Anthropogenic and Natural emissions mapping SpectrOmeter-3 (TANSO-3), for observing concentrations of greenhouse gases, such as carbon dioxide and methane, over a wide area and with high precision for improved estimation accuracy of greenhouse gas emissions. The global observation mode of TANSO-3 will cover large areas of Earth's surface without discontinuity, thus enabling more observation points than with previous models. TANSO-3 also will have a detailed observation mode with a spatial resolution three times higher than that of its predecessor, GOSAT 2, enabling greenhouse gases to be observed with higher accuracy.
  • Advanced Microwave Scanning Radiometer 3 (AMSR-3), which will estimate geophysical quantity of earth's water on land, sea-surface and in the atmosphere. AMSR3 will use an increased number of frequency bands compared to its predecessors for more accurate estimation of hydro-geophysical conditions, such as precipitation, water vapor, sea ice and sea-surface temperatures. Data obtained from observations will improve the accuracy of forecasting typhoons, torrential rains and other climatic conditions by meteorological organizations around the world. In addition, by providing detailed data for assessing the effects that climate change has on the water cycle, GOSAT-GW will contribute to efforts to measure the impact climate change has on everyday life and prepare necessary countermeasures.

In December 2013, Mitsubishi Electric (MELCO) was selected as the prime contractor for the spacecraft and the instruments.

Nation: Japan
Type / Application: Earth Observation
Operator: JAXA
Contractors: Mitsubishi Electric (MELCO)
Equipment: TANSO-3, AMSR-3
Power: 2 deployable solar arrays, batteries
Lifetime: 5 years
Mass: 1700 kg
Satellite COSPAR Date LS Launch Vehicle Remarks
GOSAT-GW (ex GOSAT 3) - 2023 Ta YLP-1 H-2A-202