Sentinel-5 Precursor
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| Sentinel-5 Precursor | |
|---|---|
| Name | Sentinel-5 Precursor |
| Mission type | Earth observation |
| Operator | European Space Agency |
| Manufacturer | Airbus Defence and Space |
| Launch date | 13 October 2017 |
| Launch rocket | Rockot |
| Launch site | Plesetsk Cosmodrome |
| Orbit type | Sun-synchronous |
| Instruments | TROPOMI |
Sentinel-5 Precursor is a European Space Agency Earth observation satellite developed to monitor atmospheric composition and air quality. It bridges continuity between instruments on the Envisat mission and the Copernicus Programme Sentinels, delivering high-spatial-resolution measurements of trace gases and aerosols. The mission supports policy and public-health applications across European Commission initiatives and international agreements such as the Paris Agreement and the Convention on Long-range Transboundary Air Pollution.
Overview
Sentinel-5 Precursor provides global coverage of atmospheric constituents with unprecedented daily sampling, complementing missions like Sentinel-2 and Sentinel-3. The project was contracted to manufacturers including Airbus Defence and Space with science collaborations from organizations such as the Royal Netherlands Meteorological Institute and the Finnish Meteorological Institute. It is a key element of the Copernicus Atmosphere Monitoring Service and works in synergy with legacy platforms like Ozone Monitoring Instrument and GOME-2.
Mission Objectives and Capabilities
Primary objectives include monitoring tropospheric and stratospheric concentrations of nitrogen dioxide, ozone, methane, carbon monoxide, and aerosols to inform air quality directives and climate assessments under the Intergovernmental Panel on Climate Change. Capabilities emphasize high spatial resolution, daily global coverage, and sensitivity to boundary-layer pollution relevant to urban areas such as London, Paris, and Beijing. The mission supports intercomparison with in situ networks including Global Atmosphere Watch stations and validation campaigns by institutions like National Aeronautics and Space Administration and National Oceanic and Atmospheric Administration.
Spacecraft and Instrumentation
The satellite hosts the TROPOspheric Monitoring Instrument (TROPOMI), a nadir-viewing spectrometer developed with industrial partners including KNMI and SRON Netherlands Institute for Space Research. TROPOMI performs spectrometry across ultraviolet, visible, near-infrared, and shortwave infrared bands, enabling retrievals of nitrogen dioxide, ozone, sulfur dioxide, formaldehyde, methane, and aerosols. The design builds on heritage from instruments aboard ERS-2 and MetOp satellites, incorporating detectors and calibration systems derived from European and international suppliers such as Thales Alenia Space.
Launch and Orbit
Sentinel-5 Precursor was launched on 13 October 2017 by a Rockot vehicle from Plesetsk Cosmodrome into a sun-synchronous low Earth orbit at approximately 824 km altitude, with an equator crossing time coordinated with other Copernicus satellites. The orbital configuration optimizes daily global coverage and co-location with measurement overpass times used by missions like Aqua and Terra for synergistic analyses. The spacecraft’s local solar time and inclination support consistent illumination conditions for radiometric calibration used by teams at ESA and partner agencies.
Data Products and Applications
TROPOMI produces Level 1 radiances and Level 2 geophysical products including total column and tropospheric column concentrations for NO2, O3, SO2, CO, and CH4, plus aerosol index and cloud properties. These products feed services such as the Copernicus Atmosphere Monitoring Service and are ingested by policy tools used by the European Environment Agency and municipal air-quality portals for cities like Madrid and Hamburg. Applications include episode detection for pollution events, emission-inventory verification for sectors relevant to the International Civil Aviation Organization and International Maritime Organization, and support for epidemiological studies coordinated with institutions such as World Health Organization.
Operations and Ground Segment
Mission operations are coordinated by the European Space Operations Centre with instrument operations and calibration led by science teams at organizations like KNMI and SRON. The ground segment integrates data processing centres across Europe and distributes products via the Copernicus Data Space and national dissemination nodes. Routine calibration/validation campaigns involve airborne platforms (for example those operated by DLR and NASA), ground-based spectrometers such as TROPOspheric Monitoring network instruments, and coordinated field studies run by research universities including University of Oxford and Sorbonne University.
Scientific Results and Impact
Since operations began, Sentinel-5 Precursor has enabled high-resolution mapping of pollution trends, providing evidence used in reports by the European Environment Agency and chapters of the Intergovernmental Panel on Climate Change assessment. The dataset revealed reductions in NO2 during pandemic lockdowns that were corroborated with independent analyses from NASA and national agencies, and has improved detection of emission plumes from events involving locations like Beirut and Kraynka. Its methane retrievals contribute to global greenhouse-gas budgets used by the Global Carbon Project and support detection of fugitive emissions relevant to industry regulation and international negotiations under the United Nations Framework Convention on Climate Change.