CO2M science studies
Science studies focusing on the Copernicus CO2 Monitoring Mission (CO2M).
27 January 2023
22 November 2021
This study aims to produce synthetic TOA test data for the MAP and CLIM instruments of the CO2M mission. The test data will be used for the evaluation of processing needs for the generation of CO2M products.
Key elements of the work will be to provide full-orbit test data for MAP and CLIM observations, consistent with the design and purpose of the CO2M platform, and to support the simulation of cloud and aerosol retrievals from this test-data. The latter are in turn supporting the retrieval of greenhouse-gas products, as well as nitrogen dioxide, from the main spectrometer instrument on-board CO2M. Test data for the main CO2M spectrometer are provided through a separate study.
The objectives of the study are to:
As input to the simulations, observation geometries, including parallax corrected geolocation calculations using terrain-height, are provided by EUMETSAT. Instrument specific design aspects like ISRF, spectral resolution and other relevant instrument performance figures will be taken from the Space Segment Requirements Document (SSRD). Atmospheric and surface modelling fields and other ancillary data will be input to this study and will be provided through the dedicated test-data study for the main spectrometer instrument on CO2M. This is to ensure maximum consistency of observation geometries and model atmosphere between all CO2M instrument test datasets. The provided atmospheric modelling fields will only be complemented by additional modelling or model parameters if absolutely required for realistic modelling of MAP and CLIM observations.
The TOA polarised radiance simulation framework for the MAP and CLIM instrument will be used for subsequent revised TOA test-data simulations by adopting different instrument settings, testing various instrument performance scenarios, or expanding on the number of orbits and satellite platforms simulated. The test-data processing framework will be configurable in such a way that the effort associated with the implementation of potential expansions or changes are minimised.
Data from this study will be delivered in the planned (level 1) format for TOA radiance data from the CO2M MAP and CLIM.
Test data will be provided corresponding to the instrument spectral response function (SRF) and also, for a smaller pixel sample, considering a spectral oversampling (see tables in Fig 2 for the spectral characteristics). This can be used for testing of the influence of SRF variability on L1 and L2 products.
Execution of the study will involve two main tasks/challenges: