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The objective of the TROPOMI instrument on-board SENTINEL-5P is to maintain the continuity of atmospheric science data for the period 2016-2022, filling the gap between past or still operating instruments (SCHIAMACHY/ENVISAT, GOME/ERS-2, GOME-2/MetOp-A, GOME-2/MetOp-B, OMI/AURA) and the future SENTINEL-5 mission.

TROPOMI is a nadir-viewing staring push-broom imager with four spectrometers covering spectral range from UV to SWIR.

The staring concept, inherited from OMI, allows TROPOMI to reach a 7x7 km2 ground pixel resolution and a wide swath of 108° (approximately 2600 km on the ground), combined with a polar circular orbit of 817 km, allowing daily coverage of the whole planet.

The TROPOMI measurement principle is presented in Figure 1.

Figure 1: TROPOMI Measurement Principle (image credit: KNMI)