A new generation of satellite instruments is transforming our ability to monitor N₂O concentrations from space, providing global coverage that surface networks cannot achieve. These advances are critical for independently verifying national emission inventories.
TROPOMI and GOSAT
The TROPOspheric Monitoring Instrument (TROPOMI) aboard the Sentinel-5P satellite, launched in 2017, provides daily global maps of atmospheric trace gases including N₂O with unprecedented 3.5×5.5 km spatial resolution. The GOSAT (Greenhouse gases Observing SATellite) series has provided continuous N₂O measurements since 2009.
TROPOMI resolution: 3.5 × 5.5 km
GOSAT revisit time: 3 days
Vertical sensitivity: ~0.3% precision
Coverage: global, daily
Emissions Attribution
By combining satellite observations with atmospheric transport models through inverse modeling, scientists can now attribute N₂O emissions to specific geographic regions and, in some cases, specific source types. The CarbonTracker-N₂O system, developed jointly by NOAA and European partners, integrates surface and satellite observations to produce monthly emission estimates at 1° × 1° resolution globally.