Correction of instrument ageing in TROPOMI L01b processing
Antje Ludewig, KNMI (Royal Netherlands Meteorological Institute), antje.ludewig@knmi.nl (Presenter)
Quintus Kleipool, KNMI (Royal Netherlands Meteorological Institute), quintus.kleipool@knmi.nl
Jonatan Leloux, TriOpSys B.V., Utrecht, The Netherlands, jonatan.leloux@knmi.nl
Erwin Loots, KNMI (Royal Netherlands Meteorological Institute), erwin.loots@knmi.nl
Emiel van der Plas, KNMI (Royal Netherlands Meteorological Institute), emiel.van.der.plas@knmi.nl
Nico Rozemeijer, TriOpSys B.V., Utrecht, The Netherlands, nico.rozemeijer@knmi.nl
Pepijn Veefkind, KNMI (Royal Netherlands Meteorological Institute), pepijn.veefkind@knmi.nl
The Sentinel-5 Precursor (S5P) mission represents the first in a series of atmospheric sounding systems within Copernicus. The S5P mission is a single-payload satellite in a low Earth orbit that provides daily global information on concentrations of trace gases and aerosols important for air quality, climate forcing, and the ozone layer.
The payload of the mission is the TROPOspheric Monitoring Instrument TROPOMI, which has been jointly developed by the Netherlands and ESA. The instrument contains four spectrometers, divided over two modules sharing a common telescope, measuring the ultraviolet, visible, near-infrared and shortwave infrared reflectance of the Earth. The imaging system enables daily global coverage using a push-broom configuration, with a spatial resolution as low as 5.5 x 3.5 km2 in nadir from a Sun-synchronous orbit at 824 km and an equator crossing time of 13:30 local solar time. Once per day the solar spectral irradiance is measured via a dedicated calibration port in the instrument.
After more than 3.5 years in orbit, a combination of instrument ageing and drifts makes it necessary to update radiometric calibration key data also during the nominal operations phase. We will report on the in-flight calibration approach to characterize and differentiate between the various degradation and drift effects. The analysis of the in-flight data results in calibration key data which is used to correct these effects in the Level 0-1b processor. Depending on the source of the degradation within the instrument, a correction is applied to the irradiance data or also the radiance data. The observed optical degradation is most pronounced in the short wavelength range of the instrument.
We will report on the current status of the known ageing and drift effects in TROPOMI and how well they can be addressed by a correction in Level 0-1b processing.
Poster: Poster_Ludewig__28_25.pdf
Presentation Type: Poster
Session: 1.5c Uncertainty quantification and bias correction techniques
Session Date: Monday (6/14) 12:00 PM