TANGO satellite: monitoring greenhouse gas emissions

Realising the Paris Agreement requires us to hold organisations responsible for greenhouse gas emissions. But at the moment, that is difficult to do so, since emissions are mostly estimated and not measured. The sooner we can collect consistent, accurate emissions data, the sooner we can work to reverse climate change.

TANGO satellite takes a closer look

TANGO stands for Twin Anthropogenic Greenhouse gas Observers. Working with ISISpace, SRON and KNMI, TNO has played an essential role in designing a twin satellite system that can measure emissions at individual industrial facilities at a spatial resolution of around 300 m x 300 m.

The agile TANGO satellites will be the only ones of their kind in Europe. Every three to four days, they can aim directly at known sources of greenhouse gas emissions, and accurately measure them. This allows the determination of publicly available emissions data and trends, their geographical distribution, their variations throughout the year, and the impact of reduction measures.

The TANGO mission is one of four winning proposals from a call from the European Space Agency (ESA), asking for innovative small satellite science missions. The four winning teams have been asked to do a design study of their proposed mission concept. Later in 2020, ESA will consider funding full mission realisation for at least one team.

The TANGO mission will use two Spectrolite instruments

TNO’s major contribution came from making things smaller. Our Spectrolite family of small instruments has sufficient high spatial resolution to measure emissions, and yet still can be mounted on a standardised nano satellite platform of less than 20 kg. This is significantly more compact than traditional satellite systems that weigh hundreds of kilograms. This approach also saves the time and cost of building a bespoke satellite platform, as is necessary for traditional missions, making Spectrolite ideally suited for the TANGO mission.

The TANGO mission will use two Spectrolite instruments to measure:

• CO₂ emissions larger than 5Mt/year, for example from power plants, which in the EU alone represent about 44% of the annual CO₂ emission,
• CH₄ emissions larger than 10kt/year, for example from oil & gas installations, landfills, and coal mines, which in the EU alone are estimated to represent about 68% of total methane emissions, and
• NO_x emissions, which will improve the detection of CO₂ plumes, deriving historic CO₂ emission trends based on readily available global NOx measurements, and to detangle the possible CO₂ contribution in mixed CH₄ - CO₂

The Spectrolite family of instruments was developed using the legacy of technology from the highly successful TROPOMI instrument that is currently operational on the Copernicus Sentinel 5p missions.

Faster insights for further progress

If selected for mission realisation, TANGO data will be a valuable addition to major European satellite mission data. After its launch in 2024, TANGO’s data will improve the detection of CO₂ and CH₄ sources done by the ESA Sentinel 5 mission.

Because TANGO is a small satellite mission, it can be realised swiftly, and its data will be available two years before the planned 2026 launch of CO2M, the ESA greenhouse gas monitoring mission. This will add an extra two years of data collection and insight in preparation for the UNFCC Global Stock Take, scheduled for 2028. This will be the key to meeting Paris Agreement goals.

Together with our partners, TNO stands ready to share this incredible innovation with the world.  Furthermore, we welcome new partnerships to use the Spectrolite family of instruments, or other TNO small instrument developments, in other innovative earth observation missions.